Unless otherwise specified, the DHCP server configuration is supported only on routing interfaces (or subinterfaces), VLAN interfaces, Layer 3 aggregate interfaces, serial interfaces, ATM interfaces, MP-group interfaces, and loopback interfaces. The subaddress pool configuration is not supported on serial, MP-group, or loopback interfaces.

bims-server

Syntax

bims-server ip ip-address [ port port-number ] sharekey key

undo bims-server

View

DHCP address pool view

Default level

2: System level

Parameters

ip ip-address: Specifies an IP address for the BIMS server.

port port-number: Specifies a port number for the BIMS server in the range of 1 to 65534.

sharekey key: Specifies a shared key for the BIMS server, a string of 1 to 16 characters.

Description

Use the bims-server command to specify the IP address, port number, and shared key of the BIMS server in the DHCP address pool for the client.

Use the undo bims-server command to remove BIMS server information assigned from the DHCP address pool to the DHCP client.

By default, no BIMS server information is specified.

If you execute the bims-server command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the IP address 1.1.1.1, port number 80, shared key aabbcc of the BIMS server in DHCP address pool 0 for the client.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] bims-server ip 1.1.1.1 port 80 sharekey aabbcc

bootfile-name

Syntax

bootfile-name bootfile-name

undo bootfile-name

View

DHCP address pool view

Default level

2: System level

Parameters

bootfile-name: Boot file name, a string of 1 to 63 characters.

Description

Use the bootfile-name command to specify a bootfile name in the DHCP address pool for the client.

Use the undo bootfile-name command to remove the specified bootfile name assigned from the DHCP address pool to the DHCP client.

By default, no bootfile name is specified.

If you execute the bootfile-name command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the bootfile aaa.cfg in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] bootfile-name aaa.cfg

dhcp enable

Syntax

dhcp enable

undo dhcp enable

View

System view

Default level

2: System level

Parameters

None

Description

Use the dhcp enable command to enable DHCP.

Use the undo dhcp enable command to disable DHCP.

By default, DHCP is disabled.

NOTE:

You must enable DHCP before performing DHCP server and relay agent configurations.

Examples

# Enable DHCP.

<Sysname> system-view

[Sysname] dhcp enable

dhcp server apply ip-pool

Syntax

dhcp server apply ip-pool pool-name

undo dhcp server apply ip-pool [ pool-name ]

View

Interface view

Default level

2: System level

Parameters

pool-name: DHCP address pool name, a case-insensitive string in the range of 1 to 35 characters.

Description

Use the dhcp server apply ip-pool command to apply an extended address pool on an interface.

Use the undo dhcp server apply ip-pool command to remove the configuration.

By default, no extended address pool is applied on an interface, and the server assigns an IP address from a common address pool to a client when the client's request arrives at the interface.

· This command is available only on a Layer 3 Ethernet interface (or subinterface), or a VLAN interface.

· If you execute the dhcp server apply ip-pool command on an interface, when a client's request arrives at the interface, the server attempts to assign the client the statically bound IP address first and then an IP address from this extended address pool.

· Only an extended address pool can be applied on an interface. The address pool to be referenced must already exist.

Related commands: dhcp server ip-pool.

Examples

# Apply extended DHCP address pool 0 on GigabitEthernet 4/0/5.

<Sysname> system-view

[Sysname] interface GigabitEthernet 4/0/5

[Sysname-GigabitEthernet4/0/5] dhcp server apply ip-pool 0

dhcp select server global-pool

Syntax

dhcp select server global-pool [ subaddress ]

undo dhcp select server global-pool [ subaddress ]

View

Interface view

Default level

2: System level

Parameters

subaddress: Supports secondary address allocation. When the DHCP server and clients are on the same network segment, the server preferably assigns an IP addresses from an address pool that resides on the same subnet as the secondary IP address of the server interface (connecting to the client). If the address pool contains no assignable IP address, the server assigns an IP address from an address pool that resides on the same subnet as the secondary IP address of the server interface. If the interface has multiple secondary IP addresses, each address pool is tried in turn for address allocation. Without the keyword subaddress specified, the DHCP server can only assign an IP address from the address pool that resides on the same subnet as the primary IP address of the server interface.

Description

Use the dhcp select server global-pool command to enable the DHCP server on specified interface(s). After the interface receives a DHCP request, the DHCP server will allocate an IP address from the address pool.

Use the undo dhcp select server global-pool command to remove the configuration. In other words, upon receiving a DHCP request from a client, the interface neither assigns an IP address to the client, nor serves as a DHCP relay agent to forward the request.

Use the undo dhcp select server global-pool subaddress command to disable the support for secondary address allocation.

By default, the DHCP server is enabled on an interface.

Examples

# Enable the DHCP server on GigabitEthernet 5/1/2.

<Sysname> system-view

[Sysname] interface gigabitethernet 5/1/2

[Sysname-GigabitEthernet5/1/2] dhcp select server global-pool

dhcp server detect

Syntax

dhcp server detect

undo dhcp server detect

View

System view

Default level

2: System level

Parameters

None

Description

Use the dhcp server detect command to enable unauthorized DHCP server detection.

Use the undo dhcp server detect command to disable the function.

By default, the function is disabled.

With this function enabled, upon receiving a DHCP request, the DHCP server will resolve from the request the IP addresses of DHCP servers which ever offered IP addresses to the DHCP client and the receiving interface. Each server detected is recorded only once. The administrator can get this information from logs to check out unauthorized DHCP servers.

Examples

# Enable unauthorized DHCP server detection.

<Sysname> system-view

[Sysname] dhcp server detect

dhcp server forbidden-ip

Syntax

dhcp server forbidden-ip low-ip-address [ high-ip-address ]

undo dhcp server forbidden-ip low-ip-address [ high-ip-address ]

View

System view

Default level

2: System level

Parameters

low-ip-address: Start IP address of the IP address range to be excluded from dynamic allocation.

high-ip-address: End IP address of the IP address range to be excluded from dynamic allocation. The end IP address must have a higher sequence than the start one.

Description

Use the dhcp server forbidden-ip command to exclude IP addresses from dynamic allocation.

Use the undo dhcp server forbidden-ip command to remove the configuration.

By default, all IP addresses in a DHCP address pool are assignable except IP addresses of the DHCP server interfaces.

Note that:

· When you use the dhcp server forbidden-ip command to exclude an IP address that is bound to a user from dynamic assignment, the address can be still assigned to the user.

· When you use the undo dhcp server forbidden-ip command to remove the configuration, the specified address/address range must be consistent with the one specified with the dhcp server forbidden-ip command. If you have configured to exclude an address range from dynamic assignment, you need to specify an address range in the undo dhcp server forbidden-ip command instead of specifying one IP address.

· Using the dhcp server forbidden-ip command repeatedly can exclude multiple IP address ranges from allocation.

Related commands: display dhcp server forbidden-ip, dhcp server ip-pool, network, and static-bind ip-address.

Examples

# Exclude the IP address range 10.110.1.1 to 10.110.1.63 from dynamic allocation.

<Sysname> system-view

[Sysname] dhcp server forbidden-ip 10.110.1.1 10.110.1.63

dhcp server ip-pool

Syntax

dhcp server ip-pool pool-name [ extended ]

undo dhcp server ip-pool pool-name

View

System view

Default level

2: System level

Parameters

pool-name: Global address pool name, which is a unique pool identifier, a string of 1 to 35 characters.

extended: Specifies the address pool as an extended address pool. If this keyword is not specified, the address pool is a common address pool.

Description

Use the dhcp server ip-pool command to create a DHCP address pool and enter its view. If the pool was created, you will directly enter its view.

Use the undo dhcp server ip-pool command to remove specified DHCP address pool.

By default, no DHCP address pool is created.

Related commands: dhcp enable and display dhcp server tree.

Examples

# Create the common address pool identified by 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0]

dhcp server ping packets

Syntax

dhcp server ping packets number

undo dhcp server ping packets

View

System view

Default level

2: System level

Parameters

number: Number of ping packets, in the range of 0 to 10. 0 means no ping operation.

Description

Use the dhcp server ping packets command to specify the maximum number of ping packets on the DHCP server.

Use the undo dhcp server ping packets command to restore the default.

The number defaults to 1.

To avoid IP address conflicts, the DHCP server checks whether an IP address is in use before assigning it to a DHCP client.

The DHCP server pings the IP address to be assigned by using ICMP. If the server gets a response within the specified period, the server selects and pings another IP address. If not, the server pings the IP address again until the specified number of ping attempts is reached. If still no response is received, the server assigns the IP address to the requesting client.

Examples

# Specify the maximum number of ping packets as 10.

<Sysname> system-view

[Sysname] dhcp server ping packets 10

dhcp server ping timeout

Syntax

dhcp server ping timeout milliseconds

undo dhcp server ping timeout

View

System view

Default level

2: System level

Parameters

milliseconds: Response timeout value for ping packets in milliseconds, in the range of 0 to 10000. 0 means no ping operation.

Description

Use the dhcp server ping timeout command to configure the ping response timeout time on the DHCP server.

Use the undo dhcp server ping timeout command to restore the default.

The time defaults to 500 ms.

To avoid IP address conflicts, the DHCP server checks whether an IP address is in use before assigning it to a DHCP client.

The DHCP server pings the IP address to be assigned by using ICMP. If the server gets a response within the specified interval, the server selects and pings another IP address. If not, the server pings the IP address again until the specified number of ping attempts is reached. If still no response is received, the server assigns the IP address to the requesting client.

Examples

# Specify the response timeout time as 1000 ms.

<Sysname> system-view

[Sysname] dhcp server ping timeout 1000

dhcp server relay information enable

Syntax

dhcp server relay information enable

undo dhcp server relay information enable

View

System view

Default level

2: System level

Parameters

None

Description

Use the dhcp server relay information enable command to enable the DHCP server to handle Option 82.

Use the undo dhcp server relay information enable command to configure the DHCP server to ignore Option 82.

By default, the DHCP server handles Option 82.

Examples

# Configure the DHCP server to ignore Option 82.

<Sysname> system-view

[Sysname] undo dhcp server relay information enable

dhcp server threshold

Syntax

dhcp server threshold { allocated-ip threshold-value | average-ip-use threshold-value | max-ip-use threshold-value }

undo dhcp server threshold { allocated-ip | average-ip-use | max-ip-use }

View

System view

Default level

2: System level

Parameters

allocated-ip threshold-value: Enables the DHCP server to send trap messages to the network management server when the ratio of successfully allocated IP addresses to received DHCP requests within five minutes reaches the threshold specified by the threshold-value argument. The threshold is a percentage value ranging from 1 to 100.

average-ip-use threshold-value: Enables the DHCP server to send trap messages to the network management server when the average IP address utilization of an address pool within five minutes reaches the threshold specified by the threshold-value argument. The threshold is a percentage value ranging from 1 to 100.

max-ip-use threshold-value: Enables the DHCP server to send trap messages to the network management server when the maximum IP address utilization of an address pool within five minutes reaches the threshold specified by the threshold-value argument. The threshold is a percentage value ranging from 1 to 100.

Description

Use the dhcp server threshold command to enable the DHCP server to send trap messages to the network management server when the specified threshold is reached.

Use the undo dhcp server threshold command to restore the default.

By default, the DHCP server does not send trap messages to the network management server.

Examples

# Enable the DHCP server to send trap messages to the network management server when the ratio of successfully allocated IP addresses to received DHCP requests within five minutes exceeds 50%.

<Sysname> system-view

[Sysname] dhcp server threshold allocated-ip 50

# Enable the DHCP server to send trap messages to the network management server when the average IP address utilization of an address pool within five minutes exceeds 80%.

<Sysname> system-view

[Sysname] dhcp server threshold average-ip-use 80

# Enable the DHCP server to send trap messages to the network management server when the maximum IP address utilization of an address pool within five minutes exceeds 80%.

<Sysname> system-view

[Sysname] dhcp server threshold max-ip-use 80

dhcp update arp (for DHCP server)

Syntax

dhcp update arp

undo dhcp update arp

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp update arp command to configure the DHCP server to support authorized ARP.

Use the undo dhcp update arp command to restore the default.

By default, the DHCP server does not support authorized ARP.

Examples

# Configure GigabitEthernet 2/1/1 to support authorized ARP.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp update arp

display dhcp server conflict

Syntax

display dhcp server conflict { all | ip ip-address } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays information about all IP address conflicts.

ip ip-address: Displays conflict information for a specified IP address.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server conflict command to display information about IP address conflicts.

Related commands: reset dhcp server conflict.

Examples

# Display information about all IP address conflicts.

<Sysname> display dhcp server conflict all

Address Discover time

4.4.4.1 Apr 25 2007 16:57:20

4.4.4.2 Apr 25 2007 17:00:10

--- total 2 entry ---

Table 1 Output description

Field	Description
Address	Conflicted IP address
Discover Time	Time when the conflict was discovered

display dhcp server expired

Syntax

display dhcp server expired { all | ip ip-address | pool [ pool-name ] } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays the lease expiration information of all DHCP address pools.

ip ip-address: Displays the lease expiration information of a specified IP address.

pool [ pool-name ]: Displays the lease expiration information of a specified address pool. The pool name is a string of 1 to 35 characters. If the pool name is not specified, the lease expiration information of all address pools is displayed.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server expired command to display the lease expiration information of specified DHCP address pool(s) or an IP address.

DHCP will assign these expired IP addresses to DHCP clients after all addresses have been assigned.

Examples

# Display information about lease expirations in all DHCP address pools.

<Sysname> display dhcp server expired all

IP address Client-identifier/ Lease expiration Type

Hardware address

4.4.4.6 3030-3066-2e65-3230- Apr 25 2007 17:10:47 Release

302e-3130-3234-2d45-

7468-6572-6e65-7430-

2f31

--- total 1 entry ---

Table 2 Output description

Field	Description
IP address	Expired IP addresses.
Client-identifier/Hardware address	IDs or MACs of clients whose IP addresses were expired.
Lease expiration	The lease expiration time.
Type	Types of lease expirations. Currently, this field is set to Release.

display dhcp server free-ip

Syntax

display dhcp server free-ip [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server free-ip command to display information about assignable IP addresses that have never been assigned.

Examples

# Display information about assignable IP addresses.

<Sysname> display dhcp server free-ip

IP Range from 10.0.0.1 to 10.0.0.254

display dhcp server forbidden-ip

Syntax

display dhcp server forbidden-ip [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server forbidden-ip command to display IP addresses excluded from dynamic allocation in DHCP address pool.

Examples

# Display IP addresses excluded from dynamic allocation in the DHCP address pool.

<Sysname> display dhcp server forbidden-ip

Global:

IP Range from 1.1.0.2 to 1.1.0.3

IP Range from 1.1.1.2 to 1.1.1.3

Pool name: 2

1.1.1.5 1.1.1.6

Table 3 Output description

Field	Description
Global	Globally excluded IP addresses specified with the dhcp server forbidden-ip command in system view. No address pool can assign these IP addresses.
Pool name	Excluded IP addresses specified with the forbidden-ip command in DHCP address pool view. They cannot be assigned from the current extended address pool only.

display dhcp server ip-in-use

Syntax

display dhcp server ip-in-use { all | ip ip-address | pool [ pool-name ] } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays the binding information of all DHCP address pools.

ip ip-address: Displays the binding information of a specified IP address.

pool [ pool-name ]: Displays the binding information of a specified address pool. The pool name is a string of 1 to 35 characters. If no pool name is specified, the binding information of all address pools is displayed.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server ip-in-use command to display the binding information of DHCP address pool(s) or an IP address.

Related commands: reset dhcp server ip-in-use.

Examples

# Display the binding information of all DHCP address pools.

<Sysname> display dhcp server ip-in-use all

Pool utilization: 0.39%

IP address Client-identifier/ Lease expiration Type

Hardware address

10.1.1.1 4444-4444-4444 NOT Used Manual

10.1.1.2 3030-3030-2e30-3030- May 1 2009 14:02:49 Auto:COMMITTED

662e-3030-3033-2d45-

7468-6572-6e65-7430-

2f31

--- total 2 entry ---

Table 4 Output description

Field	Description
Pool utilization	Utilization rate of IP addresses in a DHCP address pool, which is the ratio of assigned IP addresses to assignable IP addresses in the DHCP address pool. · When the binding information of all DHCP address pools is displayed, this field displays the total utilization rate of IP addresses in all DHCP address pools. · When the binding information of a specific DHCP address pool is displayed, this field displays the utilization rate of IP addresses in the DHCP address pool. · When the binding information of a specific IP address is displayed, this field is not displayed.
IP address	Bound IP address.
Client-identifier/Hardware address	Client’s ID or MAC of the binding.
Lease expiration	Lease expiration time: · Specific time (May 1 2009 14:02:49 in this example)—Time when the lease expires · NOT Used—The IP address of the static binding has not been assigned to the specific client. · Unlimited—Infinite lease expiration time.
Type	Binding types: · Manual—Static binding. · Auto:OFFERED—The binding sent in the DHCP-OFFER message from the server to the client. · Auto:COMMITTED—The binding sent in the DHCP-ACK message from the server to the client.

display dhcp server statistics

Syntax

display dhcp server statistics [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server statistics command to display the statistics of the DHCP server.

Related commands: reset dhcp server statistics.

Examples

# Display the statistics on the DHCP server.

<Sysname> display dhcp server statistics

Global Pool:

Pool Number: 1

Binding:

Auto: 1

Manual: 0

Expire: 0

BOOTP Request: 10

DHCPDISCOVER: 5

DHCPREQUEST: 3

DHCPDECLINE: 0

DHCPRELEASE: 2

DHCPINFORM: 0

BOOTPREQUEST: 0

BOOTP Reply: 6

DHCPOFFER: 3

DHCPACK: 3

DHCPNAK: 0

BOOTPREPLY: 0

Bad Messages: 0

Table 5 Output description

Field	Description
Global Pool	Statistics of a DHCP address pool
Pool Number	The number of address pools
Auto	The number of dynamic bindings
Manual	The number of static bindings
Expire	The number of expired bindings
BOOTP Request	The number of DHCP requests sent from DHCP clients to the DHCP server, including: · DHCPDISCOVER · DHCPREQUEST · DHCPDECLINE · DHCPRELEASE · DHCPINFORM · BOOTPREQUEST
BOOTP Reply	The number of DHCP replies sent from the DHCP server to DHCP clients, including: · DHCPOFFER · DHCPACK · DHCPNAK · BOOTPREPLY
Bad Messages	The number of erroneous messages

display dhcp server tree

Syntax

display dhcp server tree { all | pool [ pool-name ] } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays the tree organization information of all DHCP address pools.

pool [ pool-name ]: Displays information of a specified address pool. The pool name is a string of 1 to 35 characters. If no pool name is specified, information of all address pools will be displayed.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp server tree command to display information of DHCP address pool(s).

Examples

# Display information of all DHCP address pools.

<Sysname> display dhcp server tree all

Global pool:

Pool name: 0

network 20.1.1.0 mask 255.255.255.0

Sibling node:1

option 2 ip-address 1.1.1.1

expired 1 0 0

Pool name: 1

static-bind ip-address 10.10.1.2 mask 255.0.0.0

static-bind mac-address 00e0-00fc-0001

PrevSibling node:0

expired unlimited

Extended pool:

Pool name: 2

network ip range 1.1.1.0 1.1.1.255

network mask 255.255.255.0

expired 0 0 2 0

Table 6 Output description

Field	Description
Global pool	Information of a common address pool
Pool name	Address pool name
network	Network segment for address allocation
static-bind ip-address 10.10.1.2 mask 255.0.0.0 static-bind mac-address 00e0-00fc-0001	The IP address and MAC address of the static binding
Sibling node	The sibling node of the current node, nodes of this kind in the output are: · Child node—The child node (subnet segment) address pool of the current node · Parent node—The parent node (nature network segment) address pool of the current node · Sibling node—The latter sibling node of the current node (another subnet of the same nature network). The earlier the sibling node is configured, the higher selection priority the sibling node has · PrevSibling node—The previous sibling node of the current node
option	Self-defined DHCP options
expired	The lease duration, in the format of day, hour, minute, and second
Extended pool	Information of an extended address pool
network ip range	Range of assignable IP addresses in the extended address pool
network mask	Mask of IP addresses assigned from the extended address pool

dns-list

Syntax

dns-list ip-address&<1-8>

undo dns-list { ip-address | all }

View

DHCP address pool view

Default level

2: System level

Parameters

ip-address&<1-8>: DNS server IP address. &<1-8> means you can specify up to eight DNS server addresses separated by spaces.

all: Specifies all DNS server addresses to remove.

Description

Use the dns-list command to specify DNS server addresses in a DHCP address pool.

Use the undo dns-list command to remove DNS server addresses from a DHCP address pool.

By default, no DNS server address is specified.

If you repeatedly use the dns-list command, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the DNS server address 10.1.1.254 for the DHCP client in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] dns-list 10.1.1.254

domain-name

Syntax

domain-name domain-name

undo domain-name

View

DHCP address pool view

Default level

2: System level

Parameters

domain-name: Domain name suffix for DHCP clients, a string of 1 to 50 characters.

Description

Use the domain-name command to specify a domain name suffix for the DHCP clients in the DHCP address pool.

Use the undo domain-name command to remove the domain name suffix assigned from the DHCP address pool to the DHCP client.

No domain name suffix is specified by default.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify a domain name suffix of mydomain.com for the DHCP clients in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] domain-name mydomain.com

expired

Syntax

expired { day day [ hour hour [ minute minute [ second second ] ] ] | unlimited }

undo expired

View

DHCP address pool view

Default level

2: System level

Parameters

day day: Specifies the number of days, in the range of 0 to 365.

hour hour: Specifies the number of hours, in the range of 0 to 23.

minute minute: Specifies the number of minutes, in the range of 0 to 59.

second second: Specifies the number of seconds, in the range of 0 to 59.

unlimited: Specifies the infinite duration, which is actually 136 years.

Description

Use the expired command to specify the lease duration in a DHCP address pool.

Use the undo expired command to restore the default lease duration in a DHCP address pool.

By default, the lease duration of a static address pool is unlimited, and the lease duration of a dynamic address pool is one day.

The lease duration cannot be shorter than five seconds.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the lease duration as one day, two hours, three minutes, and four seconds in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] expired day 1 hour 2 minute 3 second 4

forbidden-ip

Syntax

forbidden-ip ip-address&<1-8>

undo forbidden-ip { ip-address&<1-8> | all }

View

DHCP extended address pool view

Default level

2: System level

Parameters

ip-address&<1-8>: IP addresses to be excluded from dynamic allocation. &<1-8> indicates that you can specify up to eight IP addresses, separated with spaces.

all: Excludes all IP addresses from dynamic allocation.

Description

Use the forbidden-ip command to exclude IP addresses from dynamic allocation in an extended address pool.

Use the undo forbidden-ip command to cancel specified or all excluded IP addresses.

By default, all IP addresses in an extended address pool are assignable except the IP addresses of the DHCP server interfaces.

Note that:

· Only the extended address pools support this command.

· IP addresses specified with the forbidden-ip command in DHCP address pool view are excluded from dynamic address allocation in the current extended address pool only. They are assignable in other address pools.

· Repeatedly using the forbidden-ip command can exclude multiple IP address ranges from dynamic allocation.

Related commands: dhcp server ip-pool and display dhcp server forbidden-ip.

Examples

# Exclude IP addresses 192.168.1.3 and 192.168.1.10 from dynamic allocation for extended address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0 extended

[Sysname-dhcp-pool-0] forbidden-ip 192.168.1.3 192.168.1.10

gateway-list

Syntax

gateway-list ip-address&<1-8>

undo gateway-list { ip-address | all }

View

DHCP address pool view

Default level

2: System level

Parameters

ip-address&<1-8>: Gateway IP address. &<1-8> means you can specify up to eight gateway addresses separated by spaces.

all: Specifies all gateway IP addresses to be removed.

Description

Use the gateway-list command to specify gateway address(es) in a DHCP address pool.

Use the undo gateway-list command to remove specified gateway address(es) specified for the DHCP client from a DHCP address pool.

By default, no gateway address is specified.

If you use the gateway-list command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the gateway address 10.110.1.99 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] gateway-list 10.110.1.99

nbns-list

Syntax

nbns-list ip-address&<1-8>

undo nbns-list { ip-address | all }

View

DHCP address pool view

Default level

2: System level

Parameters

ip-address&<1-8>: WINS server IP address. &<1-8> means you can specify up to eight WINS server addresses separated by spaces.

all: Specifies all WINS server addresses to be removed.

Description

Use the nbns-list command to specify WINS server address(es) in a DHCP address pool.

Use the undo nbns-list command to remove WINS server address(es) assigned from a DHCP address pool to the DHCP client.

By default, no WINS server address is specified.

If you use the nbns-list command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool, display dhcp server tree, and netbios-type.

Examples

# Specify WINS server address 10.12.1.99 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] nbns-list 10.12.1.99

netbios-type

Syntax

netbios-type { b-node | h-node | m-node | p-node }

undo netbios-type

View

DHCP address pool view

Default level

2: System level

Parameters

b-node: Broadcast node. A b-node client sends the destination name in a broadcast message. The destination returns the name-to-IP mapping to the client after receiving the message.

p-node: Peer-to-peer node. A p-node client sends the destination name in a unicast message to the WINS server, and the WINS server returns the mapping to the client.

m-node: Mixed node, a combination of a b-node first and p-node second. An m-node client broadcasts the destination name, if there is no response, and then unicasts the destination name to the WINS server to get the mapping.

h-node: Hybrid node, a combination of a p-node first and b-node second. An h-node is a p-node with the peer-to-peer communication mechanism. An h-node client unicasts the destination name to the WINS server, if there is no response, and then broadcasts it to get the mapping from the destination.

Description

Use the netbios-type command to specify the client NetBIOS node type in a DHCP address pool.

Use the undo netbios-type command to remove the client NetBIOS node type assigned from a DHCP address pool to the DHCP client.

By default, no NetBIOS node type is specified.

Related commands: dhcp server ip-pool, display dhcp server tree, and nbns-list.

Examples

# Specify the NetBIOS node type as b-node in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] netbios-type b-node

network

Syntax

network network-address [ mask-length | mask mask ]

undo network

View

DHCP address pool view

Default level

2: System level

Parameters

network-address: IP address range for dynamic allocation. If no mask length and mask is specified, the natural mask will be used.

mask-length: Mask length, in the range of 1 to 30.

mask mask: Specifies the IP address network mask, in dotted decimal format.

Description

Use the network command to specify the IP address range for dynamic allocation in a DHCP address pool.

Use the undo network command to remove the specified address range.

No IP address range is specified by default.

You can specify only one network segment for each DHCP global address pool. If you use the network command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify 192.168.8.0/24 as the address range for dynamic allocation in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] network 192.168.8.0 mask 255.255.255.0

network ip range

Syntax

network ip range min-address max-address

undo network ip range

View

DHCP address pool view

Default level

2: System level

Parameters

min-address: Lowest IP address for dynamic allocation.

max-address: Highest IP address for dynamic allocation.

Description

Use the network ip range command to specify the IP address range for dynamic allocation in an extended address pool.

Use the undo network ip range command to remove the specified address range.

No IP address range is specified by default.

· Only the extended address pools support this command.

· You can specify only one IP address range for each extended address pool. If you use the network ip range command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify 192.168.8.1 through 192.168.8.150 as the address range for dynamic allocation in extended address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0 extended

[Sysname-dhcp-pool-0] network ip range 192.168.8.1 192.168.8.150

network mask

Syntax

network mask mask

undo network mask

View

DHCP extended address pool view

Default level

2: System level

Parameters

mask: Network mask, in dotted decimal notation.

Description

Use the network mask command to specify the IP address mask for dynamic allocation in an extended address pool.

Use the undo network mask command to remove the specified IP address mask.

No IP address mask is specified by default.

Note that:

· Only the extended address pools support this command.

· If you specify an IP address range for an extended address pool without an IP address mask, the extended address pool is not valid, and therefore the system cannot assign IP addresses from the extended address pool.

Related commands: dhcp server ip-pool, display dhcp server tree, and network ip range.

Examples

# Specify 255.255.255.0 as the IP address mask for dynamic allocation in extended address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0 extended

[Sysname-dhcp-pool-0] network mask 255.255.255.0

option

Syntax

option code { ascii ascii-string | hex hex-string&<1-16> | ip-address ip-address&<1-8> }

undo option code

View

DHCP address pool view

Default level

2: System level

Parameters

code: Self-defined option number, in the range of 2 to 254, excluding 12, 50 through 55, 57 through 61, and 82.

ascii ascii-string: Specifies an ASCII string with 1 to 255 characters.

hex hex-string&<1-16>: Specifies hex digit strings. &<1-16> indicates you can specify up to 16 hex digit strings, separated by spaces. Each string contains 2, 4, 6 or 8 hex digits.

ip-address ip-address&<1-8>: Specifies IP addresses. &<1-8> indicates you can specify up to eight IP addresses, separated by spaces.

Description

Use the option command to configure a self-defined DHCP option in a DHCP address pool.

Use the undo option command to remove a self-defined DHCP option from a DHCP address pool.

The option command is not configured by default.

If you use the option command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Configure the hex digits 0x11 and 0x22 for the self-defined DHCP Option 100 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] option 100 hex 11 22

reset dhcp server conflict

Syntax

reset dhcp server conflict { all | ip ip-address }

View

User view

Default level

2: System level

Parameters

all: Clears the statistics of all IP address conflicts.

ip ip-address: Clears the conflict statistics of a specified IP address.

Description

Use the reset dhcp server conflict command to clear statistics of IP address conflict(s).

Related commands: display dhcp server conflict.

Examples

# Clears the statistics of all IP address conflicts.

<Sysname> reset dhcp server conflict all

reset dhcp server ip-in-use

Syntax

reset dhcp server ip-in-use { all | ip ip-address | pool [ pool-name ] }

View

User view

Default level

2: System level

Parameters

all: Clears the IP address dynamic binding information of all DHCP address pools.

ip ip-address: Clears the dynamic binding information of a specified IP address.

pool [ pool-name ]: Clears the dynamic binding information of a specified address pool. The pool name is a string of 1 to 35 characters. If no pool name is specified, the dynamic binding information of all address pools is cleared.

Description

Use the reset dhcp server ip-in-use command to clear dynamic IP address binding information.

Related commands: display dhcp server ip-in-use.

Examples

# Clear the binding information of IP address 10.110.1.1.

<Sysname> reset dhcp server ip-in-use ip 10.110.1.1

reset dhcp server statistics

Syntax

reset dhcp server statistics

View

User view

Default level

2: System level

Parameters

None

Description

Use the reset dhcp server statistics command to clear the statistics of the DHCP server.

Related commands: display dhcp server statistics.

Examples

# Clear the statistics of the DHCP server.

<Sysname> reset dhcp server statistics

static-bind client-identifier

Syntax

static-bind client-identifier client-identifier

undo static-bind client-identifier

View

DHCP address pool view

Default level

2: System level

Parameters

client-identifier: The client ID of a static binding, a string with 4 to 160 characters in the format H-H-H…, each H indicates 4 hex digits except the last H indicates 2 or 4 hex digits. For example, aabb-cccc-dd is a valid ID, while aabb-c-dddd and aabb-cc-dddd are both invalid.

Description

Use the static-bind client-identifier command to specify the client ID of a static binding in a DHCP address pool.

Use the undo static-bind client-identifier command to remove the client ID of a static binding from a DHCP address pool.

By default, no client ID is specified.

Note that:

· Use the static-bind client-identifier command together with the static-bind ip-address command to accomplish a static binding configuration.

· If you use the static-bind client-identifier or static-bind mac-address command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool, display dhcp server tree, static-bind ip-address, and static-bind mac-address.

Examples

# Bind the client ID aaaa-bbbb to the IP address 10.1.1.1 with the mask 255.255.255.0 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] static-bind ip-address 10.1.1.1 mask 255.255.255.0

[Sysname-dhcp-pool-0] static-bind client-identifier aaaa-bbbb

static-bind ip-address

Syntax

static-bind ip-address ip-address [ mask-length | mask mask ]

undo static-bind ip-address

View

DHCP address pool view

Default level

2: System level

Parameters

ip-address: IP address of a static binding, if no mask and mask length is specified, the natural mask is used.

mask-length: Mask length of the IP address, that is, the number of ones in the mask, in the range of 1 to 30.

mask mask: Specifies the IP address mask, in dotted decimal format.

Description

Use the static-bind ip-address command to specify an IP address in a DHCP address pool for a static binding.

Use the undo static-bind ip-address command to remove the statically bound IP address.

By default, no IP address is statically bound in a DHCP address pool.

· Use the static-bind ip-address command together with the static-bind mac-address or static-bind client-identifier command to accomplish a static binding configuration.

· The IP address of the static binding cannot be an interface address of the DHCP server. Otherwise, an IP address conflict may occur, and the bound client cannot obtain an IP address correctly.

· If you use the static-bind ip-address command repeatedly, the latest configuration will overwrite the previous one.

Related commands: dhcp server ip-pool, display dhcp server tree, static-bind client-identifier, and static-bind mac-address.

Examples

# Bind the client MAC address 0000-e03f-0305 to the IP address 10.1.1.1 with the mask 255.255.255.0 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] static-bind ip-address 10.1.1.1 mask 255.255.255.0

[Sysname-dhcp-pool-0] static-bind mac-address 0000-e03f-0305

static-bind mac-address

Syntax

static-bind mac-address mac-address

undo static-bind mac-address

View

DHCP address pool view

Default level

2: System level

Parameters

mac-address: The MAC address of a static binding, in the format H-H-H.

Description

Use the static-bind mac-address command to statically bind a MAC address to an IP address in a DHCP address pool.

Use the undo static-bind mac-address command to remove the statically bound MAC address.

By default, no MAC address is statically bound.

Note that:

· Use the static-bind mac-address command together with the static-bind ip-address command to complete a static binding configuration.

· If you use the static-bind mac-address or static-bind client-identifier command repeatedly, the latest configuration will overwrite the previous one.

Relate command: dhcp server ip-pool, static-bind client-identifier, static-bind ip-address, display dhcp server tree.

Examples

# Bind the client MAC address 0000-e03f-0305 to the IP address 10.1.1.1 with the mask 255.255.255.0 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] static-bind ip-address 10.1.1.1 mask 255.255.255.0

[Sysname-dhcp-pool-0] static-bind mac-address 0000-e03f-0305

tftp-server domain-name

Syntax

tftp-server domain-name domain-name

undo tftp-server domain-name

View

DHCP address pool view

Default level

2: System level

Parameters

domain-name: TFTP server name, a string of 1 to 63 characters.

Description

Use the tftp-server domain-name command to specify a TFTP server name in a DHCP address pool.

Use the undo tftp-server domain-name command to remove the TFTP server name from a DHCP address pool.

By default, no TFTP server name is specified.

Using the tftp-server domain-name command repeatedly will overwrite the previous configuration.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the TFTP server name as aaa in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] tftp-server domain-name aaa

tftp-server ip-address

Syntax

tftp-server ip-address ip-address

undo tftp-server ip-address

View

DHCP address pool view

Default level

2: System level

Parameters

ip-address: TFTP server IP address.

Description

Use the tftp-server ip-address command to specify the TFTP server IP address in a DHCP address pool.

Use the undo tftp-server ip-address command to remove the TFTP server IP address from a DHCP address pool.

By default, no TFTP server address is specified.

Using the tftp-server ip-address command repeatedly will overwrite the previous configuration.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Specify the TFTP server address 10.1.1.1 in DHCP address pool 0.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] tftp-server ip-address 10.1.1.1

vendor-class-identifier

Syntax

vendor-class-identifier hex-string&<1-255> ip range min-address max-address

undo vendor-class-identifier hex-string&<1-255>

View

DHCP extended address pool view

Default level

2: System level

Parameters

hex-string&<1-255>: A character string, which is used to match against Option 60 (vendor class identifier option). hex-string is a hexadecimal number ranging from 0 to FF. &<1-255> indicates that you can type up to 255 hexadecimal numbers, which are separated by spaces.

ip range min-address max-address: Specifies the IP address range for dynamic allocation. min-address is the lowest IP address and max-address is the highest IP address for dynamic allocation.

Description

Use the vendor-class-identifier command to specify an IP address range for the DHCP clients of a specified vendor.

Use the undo vendor-class-identifier command to restore the default.

By default, no IP address range is specified for the DHCP clients of any vendor.

After this feature is configured in an extended DHCP address pool, the DHCP server, when using the extended DHCP address pool to assign an IP address to a DHCP client, checks whether Option 60 in the DHCP request is the same as the character string configured with the vendor-class-identifier command. If yes, the DHCP server selects an IP address from the address range specified with this command. If not, the DHCP server selects one from the address range specified with the network ip range command.

NOTE:

· Only extended address pools support this command.

· The IP address range specified with this command must be included in that specified with the network ip range command.

Related commands: network ip range and network mask.

Examples

# Specify IP address rang 10.1.1.1 to 10.1.1.5 for the DHCP clients of vender a0 b0 0c.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0 extended

[Sysname-dhcp-pool-0] vendor-class-identifier a0 b0 0c ip range 10.1.1.1 10.1.1.5

voice-config

Syntax

voice-config { as-ip ip-address | fail-over ip-address dialer-string | ncp-ip ip-address | voice-vlan vlan-id { disable | enable } }

undo voice-config [ as-ip | fail-over | ncp-ip | voice-vlan ]

View

DHCP address pool view

Default level

2: System level

Parameters

as-ip ip-address: Specifies IP address for the backup network calling processor. When the primary network calling processor is unavailable, the DHCP client uses the backup network calling processor.

fail-over ip-address dialer-string: Specifies the failover IP address and dialer string. The dialer-string is a string of 1 to 39 characters, which can be 0 to 9, and “*”.

ncp-ip ip-address: Specifies IP address for the primary network calling processor.

voice-vlan vlan-id: Specifies the voice VLAN ID, in the range of 2 to 4094.

· disable: Disables the specified voice VLAN ID, meaning DHCP clients will not take this ID as their voice VLAN.

· enable: Enables the specified voice VLAN ID, meaning DHCP clients will take this ID as their voice VLAN.

Description

Use the voice-config command to configure specified Option 184 contents in a DHCP address pool.

Use the undo voice-config command to remove specified Option 184 contents from a DHCP address pool.

By default, no Option 184 content is configured.

You must specify the IP address of a network calling processor first to make other configured parameters take effect.

Related commands: dhcp server ip-pool and display dhcp server tree.

Examples

# Configure Option 184 in DHCP address pool 0: the primary network calling processor 10.1.1.1, backup network calling processor 10.2.2.2, voice VLAN ID 3 that is enabled, the failover IP address 10.3.3.3 and dialer string 99*.

<Sysname> system-view

[Sysname] dhcp server ip-pool 0

[Sysname-dhcp-pool-0] voice-config ncp-ip 10.1.1.1

[Sysname-dhcp-pool-0] voice-config as-ip 10.2.2.2

[Sysname-dhcp-pool-0] voice-config voice-vlan 3 enable

[Sysname-dhcp-pool-0] voice-config fail-over 10.3.3.3 99*

DHCP relay agent configuration commands

NOTE:

The DHCP relay agent configuration is supported only on Layer 3 Ethernet interfaces (or subinterfaces), virtual Ethernet interfaces (or subinterfaces), VLAN interfaces, Layer 3 aggregate interfaces, and serial interfaces.

dhcp relay address-check enable

Syntax

dhcp relay address-check enable

undo dhcp relay address-check enable

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay address-check enable command to enable address check on the relay agent.

Use the dhcp relay address-check disable command to disable address check on the relay agent.

By default, the function is disabled.

With this feature enabled, the DHCP relay agent can dynamically record clients’ IP-to-MAC bindings after clients get IP addresses through DHCP. It also supports static bindings. In other words, you can manually configure IP-to-MAC bindings on the DHCP relay agent, so that users can access external networks using fixed IP addresses.

Upon receiving an ARP packet, the DHCP relay agent matches the sender’s IP and MAC addresses in the packet against the bindings (both dynamic and static). If no match is found, the DHCP relay agent does not learn the ARP entry, and thus the sending host cannot access external networks via the DHCP relay agent.

NOTE:

· This command can be executed only on Layer 3 Ethernet interfaces (including subinterfaces) and VLAN interfaces.

· The dhcp relay address-check enable command only checks IP and MAC addresses of clients.

Examples

# Enable IP address match checking on the DHCP relay agent.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp relay address-check enable

dhcp relay check mac-address

Syntax

dhcp relay check mac-address

undo dhcp relay check mac-address

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay check mac-address command to enable MAC address check on the DHCP relay agent.

Use the undo dhcp relay check mac-address command to disable MAC address check on the DHCP relay agent.

By default, this function is disabled.

With this function enabled, the DHCP relay agent compares the chaddr field of a received DHCP request with the source MAC address field of the frame. If they are the same, the DHCP relay agent decides this request as valid and forwards it to the DHCP server; if not, the DHCP request is discarded.

DHCP relay agents change the source MAC addresses when forwarding DHCP packets. Therefore, you can enable MAC address check only on a DHCP relay agent directly connected to the DHCP clients. Otherwise, valid DHCP packets may be discarded and clients cannot obtain IP addresses.

Examples

# Enable MAC address check on the DHCP relay agent.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay check mac-address

dhcp relay client-detect enable

Syntax

dhcp relay client-detect enable

undo dhcp relay client-detect enable

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay client-detect enable command to enable offline detection on the DHCP relay agent.

Use the undo dhcp relay client-detect enable command to disable offline detection on the DHCP relay agent.

By default, this function is disabled.

With this function enabled on an interface, the DHCP relay agent removes a client’s IP-to-MAC binding entry when it is aged out, and sends a DHCP-RELEASE request to the DHCP server to release the IP address of the client.

Examples

# Enable offline detection on the DHCP relay agent.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay client-detect enable

dhcp relay information circuit-id format-type

Syntax

dhcp relay information circuit-id format-type { ascii | hex }

undo dhcp relay information circuit-id format-type

View

Interface view

Default level

2: System level

Parameters

ascii: Specifies the code type for the circuit ID sub-option as ascii.

hex: Specifies the code type for the circuit ID sub-option as hex.

Description

Use the dhcp relay information circuit-id format-type command to configure the code type for the non-user-defined circuit ID sub-option.

Use the undo dhcp relay information circuit-id format-type command to restore the default.

By default, the code type for the circuit ID sub-option depends on the specified padding format of Option 82. Each field has its own code type.

This command applies to configuring the non-user-defined circuit ID sub-option only. After you configure the padding content for the circuit ID sub-option using the dhcp relay information circuit-id string command, ASCII is adopted as the code type.

Related commands: display dhcp relay information.

Examples

# Configure the code type for the non-user-defined circuit ID sub-option as hex.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay information circuit-id format-type hex

dhcp relay information circuit-id string

Syntax

dhcp relay information circuit-id string circuit-id

undo dhcp relay information circuit-id string

View

Interface view

Default level

2: System level

Parameters

circuit-id: Padding content for the user-defined circuit ID sub-option, a case-sensitive string of 3 to 63 characters.

Description

Use the dhcp relay information circuit-id string command to configure the padding content for the user-defined circuit ID sub-option.

Use the undo dhcp relay information circuit-id string command to restore the default.

By default, the padding content for the circuit ID sub-option depends on the padding format of Option 82.

After you configure the padding content for the circuit ID sub-option using this command, ASCII is adopted as the code type.

Related commands: dhcp relay information format and display dhcp relay information.

Examples

# Configure the padding content for the circuit ID sub-option as company001.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay information circuit-id string company001

dhcp relay information enable

Syntax

dhcp relay information enable

undo dhcp relay information enable

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay information enable command to enable the relay agent to support Option 82.

Use the undo dhcp relay information enable command to disable Option 82 support.

By default, Option 82 support is disabled on DHCP relay agent.

Related commands: display dhcp relay information.

Examples

# Enable Option 82 support on the relay agent.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp relay information enable

dhcp relay information format

Syntax

dhcp relay information format { normal | verbose [ node-identifier { mac | sysname | user-defined node-identifier } ] }

undo dhcp relay information format

View

Interface view

Default level

2: System level

Parameters

normal: Specifies the normal padding format.

verbose: Specifies the verbose padding format.

node-identifier { mac | sysname | user-defined node-identifier }: Specifies access node identifier. By default, the node MAC address is used as the node identifier.

· mac indicates using MAC address as the node identifier.

· sysname indicates using the device name of a node as the node identifier.

· user-defined node-identifier indicates using a specified character string as the node identifier, in which node-identifier is a string with 1 to 50 characters.

Description

Use the dhcp relay information format command to specify a padding format for Option 82.

Use the undo dhcp relay information format command to restore the default padding format.

The Option 82 padding format defaults to normal.

NOTE:

· If configuring the handling strategy of the DHCP relay agent as replace, you need to configure a padding format of Option 82. If the handling strategy is keep or drop, you need not configure any padding format.

· If sub-option 1 (node identifier) of Option 82 is padded with the device name (sysname) of a node, the device name must contain no spaces. Otherwise, the DHCP relay agent will drop the message.

Related commands: display dhcp relay information.

Examples

# Specify the verbose padding format for Option 82.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp relay information enable

[Sysname-GigabitEthernet3/1/1] dhcp relay information strategy replace

[Sysname-GigabitEthernet3/1/1] dhcp relay information format verbose

dhcp relay information remote-id format-type

Syntax

dhcp relay information remote-id format-type { ascii | hex }

undo dhcp relay information remote-id format-type

View

Interface view

Default level

2: System view

Parameters

ascii: Specifies the code type for the remote ID sub-option as ascii.

hex: Specifies the code type for the remote ID sub-option as hex.

Description

Use the dhcp relay information remote-id format-type command to configure the code type for the non-user-defined remote ID sub-option.

Use the undo dhcp relay information remote-id format-type command to restore the default.

By default, the code type for the remote ID sub-option is HEX.

This command applies to configuring the non-user-defined remote ID sub-option only. After you configure the padding content for the remote ID sub-option using the dhcp relay information remote-id string command, ASCII is adopted as the code type.

Related commands: display dhcp relay information.

Examples

# Configure the code type for the non-user-defined remote ID sub-option as hex.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay information remote-id format-type hex

dhcp relay information remote-id string

Syntax

dhcp relay information remote-id string { remote-id | sysname }

undo dhcp relay information remote-id string

View

Interface view

Default level

2: System level

Parameters

remote-id: Padding content for the user-defined remote ID sub-option, a case sensitive string of 1 to 63 characters.

sysname: Specifies the device name as the padding content for the remote ID sub-option.

Description

Use the dhcp relay information remote-id string command to configure the padding content for the user-defined remote ID sub-option.

Use the undo dhcp relay information remote-id string command to restore the default.

By default, the padding content for the remote ID sub-option depends on the padding format of Option 82.

After you configure the padding content for the remote ID sub-option using this command, ASCII is adopted as the code type.

NOTE:

If you want to specify the character string sysname (a case-insensitive character string) as the padding content for the remote ID sub-option, you need to use quotation marks to make it take effect. For example, if you want to specify Sysname as the padding content for the remote ID sub-option, you need to enter the dhcp relay information remote-id string “Sysname” command.

Related commands: dhcp relay information format and display dhcp relay information.

Examples

# Configure the padding content for the remote ID sub-option as device001.

<Sysname> system-view

[Sysname] interface gigabitethernet 2/1/1

[Sysname-GigabitEthernet2/1/1] dhcp relay information remote-id string device001

dhcp relay information strategy

Syntax

dhcp relay information strategy { drop | keep | replace }

undo dhcp relay information strategy

View

Interface view

Default level

2: System level

Parameters

drop: Specifies to drop messages containing Option 82.

keep: Specifies to forward messages containing Option 82 without any change.

replace: Specifies to forward messages containing Option 82 after replacing the original Option 82 with the Option 82 padded in the specified padding format.

Description

Use the dhcp relay information strategy command to configure DHCP relay agent handling strategy for messages containing Option 82.

Use the undo dhcp relay information strategy command to restore the default handling strategy.

The handling strategy for messages containing Option 82 defaults to replace.

Related commands: display dhcp relay information.

Examples

# Configure the DHCP relay agent handling strategy for messages containing Option 82 as keep.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp relay information enable

[Sysname-GigabitEthernet3/1/1] dhcp relay information strategy keep

dhcp relay release ip

Syntax

dhcp relay release ip client-ip

View

System view

Default level

2: System level

Parameters

client-ip: DHCP client IP address.

Description

Use the dhcp relay release ip command to request the DHCP server to release a specified client IP address.

Examples

# Request the DHCP server to release the IP address 1.1.1.1.

<Sysname> system-view

[Sysname] dhcp relay release ip 1.1.1.1

dhcp relay security static

Syntax

dhcp relay security static ip-address mac-address [ interface interface-type interface-number ]

undo dhcp relay security { ip-address | all | dynamic | interface interface-type interface-number | static }

View

System view

Default level

2: System level

Parameters

ip-address: Client IP address for creating a static binding.

mac-address: Client MAC address for creating a static binding, in the format H-H-H.

interface interface-type interface-number: Specifies a Layer 3 interface connecting to the DHCP client. interface-type interface-number specifies the interface type and interface number.

all: Specifies all entries of client IP-to-MAC bindings to be removed.

dynamic: Specifies entries of dynamic client IP-to-MAC bindings to be removed.

static: Specifies entries of manual client IP-to-MAC bindings to be removed.

Description

Use the dhcp relay security static command to configure a static addressing binding, which is the binding between IP address, MAC address, and Layer 3 interface on the relay agent.

Use the undo dhcp relay security command to remove specified binding entries from the relay agent.

No manual IP-to-MAC binding is configured on the DHCP relay agent by default.

Note that:

· When using the dhcp relay security static command to bind an interface to a static binding entry, make sure that the interface is configured as a DHCP relay agent; otherwise, address entry conflicts may occur.

· The undo dhcp relay security interface command removes all the dynamic client entries from the interface.

Related commands: display dhcp relay security.

Examples

# Bind DHCP relay interface GigabitEthernet 3/1/1 to IP address 10.10.1.1 and MAC address 0005-5d02-f2b3 of the client.

<Sysname> system-view

[Sysname] dhcp relay security static 10.10.1.1 0005-5d02-f2b3 interface gigabitethernet 3/1/1

dhcp relay security refresh enable

Syntax

dhcp relay security refresh enable

undo dhcp relay security refresh enable

View

System view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay security refresh enable command to enable the DHCP relay agent to periodically refresh dynamic client entries.

Use the undo dhcp relay security refresh enable command to disable periodic refresh of dynamic client entries.

By default, the DHCP relay agent is enabled to periodically refresh dynamic client entries.

If you disable the DHCP relay agent from periodically refreshing dynamic client entries, such entries do not age automatically. Therefore, if a client relinquishes its IP address, you need to manually remove the corresponding dynamic client entry on the DHCP relay agent.

Related commands: dhcp relay security tracker and dhcp relay security static.

Examples

# Disable the DHCP relay agent from periodically refreshing dynamic client entries.

<Sysname> system-view

[Sysname] undo dhcp relay security refresh enable

dhcp relay security tracker

Syntax

dhcp relay security tracker { interval | auto }

undo dhcp relay security tracker [ interval ]

View

System view

Default level

2: System level

Parameters

interval: Refreshing interval in seconds, in the range of 1 to 120.

auto: Specifies the auto refreshing interval, which is the value of 60 seconds divided by the number of binding entries. Thus, the more entries are, the shorter interval is, but the shortest interval is no less than 500 ms.

Description

Use the dhcp relay security tracker command to set a refreshing interval at which the relay agent contacts the DHCP server for refreshing dynamic bindings.

Use the undo dhcp relay security tracker command to restore the default interval.

The default handshake interval is auto, the value of 60 seconds divided by the number of binding entries.

Related commands: display dhcp relay security tracker.

Examples

# Set the handshake interval as 100 seconds.

<Sysname> system-view

[Sysname] dhcp relay security tracker 100

dhcp relay server-detect

Syntax

dhcp relay server-detect

undo dhcp relay server-detect

View

System view

Default level

2: System level

Parameters

None

Description

Use the dhcp relay server-detect command to enable unauthorized DHCP server detection.

Use the undo dhcp relay server-detect command to disable unauthorized DHCP server detection.

By default, unauthorized DHCP server detection is disabled.

With this function enabled, upon receiving a DHCP request, the DHCP relay agent will resolve from the request the IP addresses of all DHCP servers which ever offered IP addresses to the DHCP client and the receiving interface. Each server detected is recorded only once. The administrator can get this information from logs to check out unauthorized DHCP servers.

After the information of recorded DHCP servers is cleared, the relay agent will re-record server information following this mechanism.

Examples

# Enable unauthorized DHCP server detection.

<Sysname> system-view

[Sysname] dhcp relay server-detect

dhcp relay server-group

Syntax

dhcp relay server-group group- ip ip-address

undo dhcp relay server-group group-id [ ip ip-address ]

View

System view

Default level

2: System level

Parameters

group-id: DHCP server group number, in the range of 0 to 19.

ip ip-address: DHCP server IP address.

Description

Use the dhcp relay server-group command to specify a DHCP server for a DHCP server group.

Use the undo dhcp relay server-group command to remove a DHCP server from a DHCP server group, if no ip ip-address is specified, all servers in the DHCP server group and the server group itself will be removed.

By default, no DHCP server is specified for a DHCP server group.

· The IP address of a DHCP server and the IP address of the DHCP relay agent’s interface that connects the DHCP client cannot be in the same network segment. Otherwise, the client may fail to obtain an IP address.

· If a server group has been correlated to multiple interfaces, you need to cancel these correlations before removing the server group.

Related commands: display dhcp relay server-group.

Examples

# Specify DHCP server 1.1.1.1 for DHCP server group 1 on the relay agent.

<Sysname> system-view

[Sysname] dhcp relay server-group 1 ip 1.1.1.1

dhcp relay server-select

Syntax

dhcp relay server-select group-id

undo dhcp relay server-select

View

Interface view

Default level

2: System level

Parameters

group-id: DHCP server group number to be correlated, in the range of 0 to 19.

Description

Use the dhcp relay server-select command to correlate specified interface(s) to a specified DHCP server group.

Use the undo dhcp relay server-select command to remove a configured correlation.

By default, no DHCP server group is correlated with an interface on the relay agent.

Note that:

· A DHCP server group can correlate with one or multiple DHCP relay agent interfaces.

· A relay agent interface can only correlate with one DHCP server group, and a newly configured correlation overwrites the previous one. If the server group in the new correlation does not exist, the new configuration will not work. The interface still maintains the previous correlation.

· The DHCP server group referenced in this command should have been configured by using the dhcp relay server-group command.

Related commands: dhcp relay server-group and display dhcp relay.

Examples

# Correlate the interface GigabitEthernet 3/1/1 to the DHCP server group 1.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp relay server-select 1

dhcp select relay

Syntax

dhcp select relay

undo dhcp select relay

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp select relay command to enable the relay agent on the current interface, specified or all interfaces. Upon receiving requests from an enabled interface, the relay agent will forward these requests to outside DHCP servers for IP address allocation.

Use the undo dhcp select relay command to restore the default on interface(s).

After DHCP is enabled, the DHCP server is enabled on an interface by default. Upon receiving a client’s request from the interface, the DHCP server allocates an IP address from the DHCP address pool to the client.

When the working mode of the interface is changed from DHCP server to DHCP relay agent, neither the IP address leases nor the authorized ARP entries will be deleted. However, these ARP entries may conflict with the new static ARP entries generated on the DHCP relay agent; therefore, you are recommended to delete the existing IP address leases when changing the interface working mode to DHCP relay agent.

Examples

# Enable the DHCP relay agent on the interface GigabitEthernet 3/1/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp select relay

dhcp update arp (for DHCP relay agent)

Syntax

dhcp update arp

undo dhcp update arp

View

Interface view

Default level

2: System level

Parameters

None

Description

Use the dhcp update arp command to configure the DHCP relay agent to support authorized ARP.

Use the undo dhcp update arp command to restore the default.

By default, the DHCP relay agent does not support authorized ARP.

Examples

# Configure GigabitEthernet 3/1/1 to support authorized ARP.

<Sysname> system-view

[Sysname] interface gigabitethernet 3/1/1

[Sysname-GigabitEthernet3/1/1] dhcp update arp

display dhcp relay

Syntax

display dhcp relay { all | interface interface-type interface-number } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays the information of DHCP server groups correlated to all interfaces.

interface interface-type interface-number: Displays the information of the DHCP server group correlated to a specified interface.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay command to display information about DHCP server groups correlated to an interface or all interfaces.

Examples

# Display information about DHCP server groups correlated to all interfaces.

[Sysname] display dhcp relay all

Interface name Server-group

GigabitEthernet 3/1/1 2

Table 7 Output description

Field	Description
Interface name	Interface name
Server-group	DHCP server group number correlated to the interface

display dhcp relay information

Syntax

display dhcp relay information { all | interface interface-type interface-number } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

all: Displays the Option 82 configuration information of all interfaces.

interface interface-type interface-number: Displays the Option 82 configuration information of a specified interface.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay information command to display Option 82 configuration information on the DHCP relay agent.

Examples

# Display the Option 82 configuration information of all interfaces.

<Sysname> display dhcp relay information all

Interface: GigabitEthernet1/1/2

Status: Enable

Strategy: Replace

Format: Verbose

Circuit ID format-type: HEX

Remote ID format-type: ASCII

Node identifier: aabbcc

User defined:

Circuit ID: company001

Interface: GigabitEthernet1/1/3

Status: Enable

Strategy: Keep

Format: Normal

Circuit ID format-type: HEX

Remote ID format-type: ASCII

User defined:

Remote ID: device001

Table 8 Output description

Field	Description
Interface	Interface name.
Status	Option 82 state, enabled or disabled.
Strategy	Handling strategy for requesting messages containing Option 82, which can be Drop, Keep, or Replace.
Format	Padding format of Option 82, which can be Normal or Verbose.
Circuit ID format-type	Non-user-defined code type of the circuit ID sub-option, which can be ASCII or HEX.
Remote ID format-type	Non-user-defined code type of the remote ID sub-option, which can be ASCII or HEX.
Node identifier	Access node identifier.
User defined	Content of user-defined sub-options.
Circuit ID	User-defined padding content of the circuit ID sub-option.
Remote ID	User-defined padding content of the remote ID sub-option.

display dhcp relay security

Syntax

display dhcp relay security [ ip-address | dynamic | static ] [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

ip-address: Displays the binding information of an IP address.

dynamic: Displays information about dynamic bindings.

static: Displays information about static bindings.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay security command to display information about bindings of DHCP relay agents. If no parameter is specified, information about all bindings will be displayed.

You must enable IP address check, authorized ARP support, or IP source guard on the DHCP relay agent before it can generate dynamic client entries. For more information about IP source guard, see Security Configuration Guide.

Examples

# Display information about all bindings.

<Sysname> display dhcp relay security

IP Address MAC Address Type Interface

10.1.1.1 00e0-0000-0001 Static GE3/1/1

--- 1 dhcp-security item(s) found ---

Table 9 Output description

Field	Description
IP Address	Client IP address.
MAC Address	Client MAC address.
Type	Type of binding, including dynamic, static and temporary.
Interface	Layer 3 interface connecting to the DHCP client. If no interface is recorded in the binding entry, “N/A” is displayed.

display dhcp relay security statistics

Syntax

display dhcp relay security statistics [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay security statistics command to display statistics information about bindings of DHCP relay agents.

Examples

# Display statistics about client address binding entries.

<Sysname> display dhcp relay security statistics

Static Items :1

Dynamic Items :0

Temporary Items :0

All Items :1

Table 10 Output description

Field	Description
Static Items	Static client address binding items
Dynamic Items	Dynamic client address binding items
Temporary Items	Temporary client address binding items
All Items	All client address binding items

display dhcp relay security tracker

Syntax

display dhcp relay security tracker [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay security tracker command to display the interval for refreshing dynamic bindings on the relay agent.

Examples

# Display the interval for refreshing dynamic bindings on the relay agent.

[Sysname] display dhcp relay security tracker

Current tracker interval : 10s

The interval is 10 seconds.

display dhcp relay server-group

Syntax

display dhcp relay server-group { group-id | all } [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

group-id: Displays the information of the specified DHCP server group numbered from 0 to 19.

all: Displays the information of all DHCP server groups.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay server-group command to display the configuration information of a specified or all DHCP server groups.

Examples

# Display IP addresses of DHCP servers in DHCP server group 1.

<Sysname> display dhcp relay server-group 1

No. Group IP

1 1.1.1.1

2 1.1.1.2

Table 11 Output description

Field	Description
No.	Sequence number
Group IP	IP address in the server group

display dhcp relay statistics

Syntax

display dhcp relay statistics [ server-group { group-id | all } ] [ | { begin | exclude | include } regular-expression ]

View

Any view

Default level

1: Monitor level

Parameters

group-id: Specifies a server group number in the range of 0 to 19 about which to display DHCP packet statistics.

all: Specifies all server groups about which to display DHCP packet statistics. Information for each group will be displayed.

|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.

begin: Displays the first line that matches the specified regular expression and all lines that follow.

include: Displays all lines that match the specified regular expression.

regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

Description

Use the display dhcp relay statistics command to display DHCP packet statistics related to a specified or all DHCP server groups.

If no parameter (server-group and all) is specified, all DHCP packet statistics on the relay agent will be displayed.

Related commands: reset dhcp relay statistics.

Examples

# Display all DHCP packet statistics on the relay agent.

<Sysname> display dhcp relay statistics

Bad packets received: 0

DHCP packets received from clients: 0

DHCPDISCOVER packets received: 0

DHCPREQUEST packets received: 0

DHCPINFORM packets received: 0

DHCPRELEASE packets received: 0

DHCPDECLINE packets received: 0

BOOTPREQUEST packets received: 0

DHCP packets received from servers: 0

DHCPOFFER packets received: 0

DHCPACK packets received: 0

DHCPNAK packets received: 0

BOOTPREPLY packets received: 0

DHCP packets relayed to servers: 0

DHCPDISCOVER packets relayed: 0

DHCPREQUEST packets relayed: 0

DHCPINFORM packets relayed: 0

DHCPRELEASE packets relayed: 0

DHCPDECLINE packets relayed: 0

BOOTPREQUEST packets relayed: 0

DHCP packets relayed to clients: 0

DHCPOFFER packets relayed: 0

DHCPACK packets relayed: 0

DHCPNAK packets relayed: 0

BOOTPREPLY packets relayed: 0

DHCP packets sent to servers: 0

DHCPDISCOVER packets sent: 0

DHCPREQUEST packets sent: 0

DHCPINFORM packets sent: 0

DHCPRELEASE packets sent: 0

DHCPDECLINE packets sent: 0

BOOTPREQUEST packets sent: 0

DHCP packets sent to clients: 0

DHCPOFFER packets sent: 0

DHCPACK packets sent: 0

DHCPNAK packets sent: 0

BOOTPREPLY packets sent: 0

# Display DHCP packet statistics related to every server group on the relay agent.

<Sysname> display dhcp relay statistics server-group all

DHCP relay server-group #0

Packet type Packet number

Client -> Server:

DHCPDISCOVER 0

DHCPREQUEST 0

DHCPINFORM 0

DHCPRELEASE 0

DHCPDECLINE 0

BOOTPREQUEST 0

Server -> Client:

DHCPOFFER 0

DHCPACK 0

DHCPNAK 0

BOOTPREPLY 0

reset dhcp relay statistics

Syntax

reset dhcp relay statistics [ server-group group-id ]

View

User view

Default level

1: Monitor level

Parameters

server-group group-id: Specifies a server group ID (in the range of 0 to 19) about which to remove statistics from the relay agent.

Description

Use the reset dhcp relay statistics command to remove statistics from the relay agent.

If no server-group is specified, all statistics will be removed from the relay agent.

Related commands: display dhcp relay statistics.

Examples

# Remove all statistics from the DHCP relay agent.

<Sysname> reset dhcp relay statistics

05-Layer 3 - IP Services Command Reference

dhcp enable

dhcp server detect

dhcp server forbidden-ip

dhcp server ping packets

dhcp server threshold

dhcp update arp (for DHCP server)

dhcp relay address-check enable

dhcp relay check mac-address

dhcp relay information remote-id format-type

dhcp relay release ip

dhcp relay security static

dhcp update arp (for DHCP relay agent)

reset dhcp relay statistics

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