Contents

GRE commands· 1

bandwidth· 1

default 1

description· 2

destination· 2

display interface tunnel 3

gre checksum·· 7

gre key· 8

interface tunnel 8

keepalive· 9

mtu· 10

reset counters interface· 11

shutdown· 11

source· 12

tunnel dfbit enable· 13

tunnel tos· 13

tunnel ttl 14

GRE commands

bandwidth

Use bandwidth to set the expected bandwidth for an interface.

Use undo bandwidth to restore the default.

Syntax

bandwidth bandwidth-value

undo bandwidth

Default

The expected bandwidth (in kbps) is the interface maximum rate divided by 1000.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

bandwidth-value: Specifies the expected bandwidth in the range of 1 to 400000000 kbps.

Usage guidelines

The expected bandwidth for an interface affects the link costs.

Examples

# Set the expected bandwidth for Tunnel 1 to 100 kbps.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] bandwidth 100

default

Use default to restore the default settings for a tunnel interface.

Syntax

default

Views

Tunnel interface view

Predefined user roles

network-admin

Usage guidelines

The default command might interrupt ongoing network services. Make sure you are fully aware of the impacts of this command when you use it on a live network.

This command might fail to restore the default settings for some commands for reasons such as command dependencies or system restrictions. Use the display this command in interface view to identify these commands. Use their undo forms or follow the command reference to restore their default settings. If your restoration attempt still fails, follow the error message instructions to resolve the problem.

Examples

# Restore the default settings of interface tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] default

description

Use description to configure a description for a tunnel interface.

Use undo description to restore the default.

Syntax

description text

undo description

Default

The description for a tunnel interface is Tunnelnumber Interface, for example, Tunnel1 Interface.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

text: Configures a description for the interface, a case-sensitive string of 1 to 255 characters.

Usage guidelines

Configure descriptions for different interfaces for identification and management purposes.

You can use the display interface command to display the configured interface description.

Examples

# Configure the description for interface Tunnel 1 as tunnel1.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] description tunnel1

Related commands

display interface tunnel

destination

Use destination to specify the destination address for a tunnel interface.

Use undo destination to remove the configured tunnel destination address.

Syntax

destination { ip-address | ipv6-address }

undo destination

Default

No tunnel destination address is configured.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the tunnel destination IPv4 address.

ipv6-address: Specifies the tunnel destination IPv6 address.

Usage guidelines

The tunnel destination address must be the address of the receiving interface on the tunnel peer. It is used as the destination address of tunneled packets.

The destination address of the local tunnel interface must be the source address of the peer tunnel interface, and vice versa.

Examples

# VLAN-interface 1 on Sysname 1 uses the IP address 193.101.1.1 and VLAN-interface 1 on Sysname 2 uses the IP address 192.100.1.1. Configure the source address 193.101.1.1 and destination address 192.100.1.1 for the tunnel interface on Sysname 1.

<Sysname1> system-view

[Sysname1] interface tunnel 1 mode gre

[Sysname1-Tunnel1] source 193.101.1.1

[Sysname1-Tunnel1] destination 192.100.1.1

# Configure the source address 192.100.1.1 and destination address 193.101.1.1 for the tunnel interface on Sysname 2.

<Sysname2> system-view

[Sysname2] interface tunnel 1 mode gre

[Sysname2-Tunnel1] source 192.100.1.1

[Sysname2-Tunnel1] destination 193.101.1.1

Related commands

·     display interface tunnel

·     interface tunnel

·     source

display interface tunnel

Use display interface tunnel to display information about tunnel interfaces, including the source address, destination address, and tunnel mode.

Syntax

display interface [ tunnel [ number ] ] [ brief [ description | down ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

number: Specifies the number of an existing tunnel interface.

brief: Displays brief interface information. If you do not specify this keyword, the command displays detailed interface information.

description: Displays complete interface descriptions. If you do not specify this keyword, the command displays only the first 27 characters of interface descriptions.

down: Displays information about interfaces in the physical state of DOWN and the causes. If you do not specify this keyword, the command displays information about interfaces in all states.

Usage guidelines

If you do not specify the tunnel keyword, this command displays information about all interfaces on the device.

If you specify the tunnel keyword without the number argument, this command displays information about all existing tunnel interfaces.

Examples

# Display detailed information about interface Tunnel 1.

<Sysname> display interface tunnel 1

Tunnel1

Current state: UP

Line protocol state: UP

Description: Tunnel1 Interface

Bandwidth: 64kbps

Maximum transmission unit: 64000

Internet address: 10.1.2.1/24 (primary)

Tunnel source 2002::1:1 (Vlan-interface10), destination 2001::2:1

Tunnel keepalive enabled, Period(50 s), Retries(3)

Tunnel TOS 0xC8, Tunnel TTL 255

Tunnel protocol/transport GRE/IPv6

    GRE key value is 1

    Checksumming of GRE packets disabled

Last clearing of counters: Never

Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

Table 1 Command output

Field	Description
Tunnel1	Information about the tunnel interface Tunnel 1.
Current state	State of the tunnel interface: ·     Administratively DOWN—The interface has been shut down by using the shutdown command. ·     DOWN—The interface is administratively up but its physical state is down. ·     DOWN (Tunnel-Bundle administratively down)—The tunnel bundle interface to which the interface belongs has been shut down by using the shutdown command. ·     UP—Both the administrative and physical states of the interface are up.
Line protocol state	Link layer protocol state of the tunnel interface. The value is determined by parameter negotiation on the link layer. ·     UP—The protocol state of the interface is up. ·     UP (spoofing)—The link protocol state of the interface is up, but the link is temporarily set up on demand or does not exist. This attribute is available for null interfaces and loopback interfaces. ·     DOWN—The protocol state of the interface is down.
Description	Description for the tunnel interface.
Bandwidth	Expected bandwidth for the tunnel interface.
Maximum transmission unit	MTU of the tunnel interface.
Internet address	IP address of the tunnel interface. If no IP address is assigned to the interface, this field displays Internet protocol processing: Disabled, and the tunnel interface cannot process packets. If (primary) is displayed, the IP address is the primary IP address of the interface.
Tunnel source	Source address of the tunnel. If a source interface is specified for the tunnel interface, this field also displays the source interface in parentheses.
destination	Destination address of the tunnel.
Tunnel keepalive enabled, Period(50 s), Retries(3)	Keepalive is enabled to detect the state of the tunnel interface. In this example, keepalive packets are sent every 50 seconds, and the maximum sending attempts are three.
Tunnel TOS	ToS of tunneled packets.
Tunnel TTL	TTL of tunneled packets.
Tunnel protocol/transport	Tunnel mode and transport protocol: ·     GRE/IP—GRE/IPv4 tunnel mode. ·     GRE/IPv6—GRE/IPv6 tunnel mode.
GRE key value is 1	The GRE tunnel interface key is 1.
Checksumming of GRE packets disabled	The GRE packet checksum feature is disabled.
Last clearing of counters	Last time when counters were cleared.
Last 300 seconds input:  0 bytes/sec, 0 packets/sec	Average input rate in the last 300 seconds.
Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec	Average output rate in the last 300 seconds.

 

# Display brief information about interface Tunnel 1.

<Sysname> display interface tunnel 1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link Protocol Primary IP     Description

Tun1                 UP   UP       1.1.1.1        tunnel1

# Display brief information about interface Tunnel 1, including the complete interface description.

<Sysname> display interface tunnel 1 brief description

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link Protocol Primary IP     Description

Tun1                 UP   UP       1.1.1.1        tunnel1

# Display information about interfaces in DOWN state and the causes.

<Sysname> display interface tunnel brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface            Link Cause

Tun0                 DOWN Not connected

Tun1                 DOWN Not connected

Table 2 Command output

Field	Description
Brief information on interfaces in route mode	Brief information about Layer 3 interfaces.
Link: ADM - administratively down; Stby - standby	Link status: ·     ADM—The interface has been administratively shut down. To bring it up, use the undo shutdown command. ·     Stby—The interface is a backup interface. To show the primary interface, use the display interface-backup state command.
Protocol: (s) - spoofing	(s) indicates that the data link layer protocol state is UP, but the link is temporarily set up on demand or does not exist. This attribute is available for null interfaces and loopback interfaces.
Interface	Abbreviated interface name.
Link	Physical link state of the interface: ·     UP—The link is physically up. ·     DOWN—The link is physically down. ·     ADM—The link has been administratively shut down. To bring it up, use the undo shutdown command. ·     Stby—The interface is a backup interface.
Protocol	Data link layer protocol state of the interface: ·     UP—The data link protocol state of the interface is up. ·     DOWN—The data link protocol state of the interface is down. ·     UP(s)—The data link protocol state of the interface is up, but the link is temporarily set up on demand or does not exist. This attribute is available for null interfaces and loopback interfaces.
Primary IP	Primary IP address of the interface.
Description	Description for the interface.
Cause	Causes for the physical state of DOWN: ·     Administratively—The link has been shut down by using the shutdown command. To bring it up, use the undo shutdown command. ·     Not connected—The tunnel is not established. ·     DOWN (Tunnel-Bundle administratively down)—The tunnel bundle interface to which the tunnel interface belongs has been shut down by using the shutdown command.

 

Related commands

·     destination

·     interface tunnel

·     source

gre checksum

Use gre checksum to enable GRE checksum.

Use undo gre checksum to disable GRE checksum.

Syntax

gre checksum

undo gre checksum

Default

GRE checksum is disabled.

Views

Tunnel interface view

Predefined user roles

network-admin

Usage guidelines

GRE checksum verifies packet integrity.

You can enable or disable GRE checksum at each end of a tunnel as needed. After GRE checksum is enabled, the sender does the following:

·     Calculates the checksum for the GRE header and the payload.

·     Sends the packet containing the checksum information to the peer.

The receiver calculates the checksum for the received packet and compares it with that carried in the packet. If the checksums are the same, the receiver processes the packet. If the checksums are different, the receiver discards the packet.

If a packet carries a GRE checksum, the receiver checks the checksum whether or not the receiver is enabled with GRE checksum.

Examples

# Enable GRE checksum.

<Sysname> system-view

[Sysname] interface tunnel 2 mode gre

[Sysname-Tunnel2] gre checksum

gre key

Use gre key to configure a key for a GRE tunnel interface.

Use undo gre key to remove the configuration.

Syntax

gre key key-number

undo gre key

Default

No key is configured for a GRE tunnel interface.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

key-number: Specifies the key for the GRE tunnel interface, in the range of 0 to 4294967295.

Usage guidelines

You can configure a GRE key to check for the validity of packets received on a GRE tunnel interface.

When a GRE key is configured, the sender puts the GRE key into each sent packet. The receiver compares the GRE key in the received packet with its own GRE key. If the two keys are the same, the receiver accepts the packet. If the two keys are different, the receiver drops the packet.

Both ends of a GRE tunnel must have the same key or no key.

Examples

# Configure the GRE key as 123 for the GRE tunnel interface.

<Sysname> system-view

[Sysname] interface tunnel 2 mode gre

[Sysname-Tunnel2] gre key 123

interface tunnel

Use interface tunnel to create a tunnel interface, specify the tunnel mode, and enter tunnel interface view.

Use undo interface tunnel to delete a tunnel interface.

Syntax

interface tunnel number [ mode gre [ ipv6 ] ]

undo interface tunnel number

Default

No tunnel interface is created on the device.

Views

System view

Predefined user roles

network-admin

Parameters

number: Specifies the number of the tunnel interface. The value range for this argument is 0 to 1023. The number of tunnel interfaces that can be created is restricted by the total number of interfaces and the memory.

mode gre: Specifies the GRE/IPv4 tunnel mode.

mode gre ipv6: Specifies the GRE/IPv6 tunnel mode.

Usage guidelines

To create a new tunnel interface, you must specify the tunnel mode in this command. To enter the view of an existing tunnel interface, you do not need to specify the tunnel mode.

A tunnel interface number is locally significant. The tunnel interfaces on the two ends of a tunnel can use the same or different interface numbers.

Examples

# Create the GRE/IPv4 tunnel interface Tunnel 1 and enter tunnel interface view.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1]

Related commands

·     destination

·     display interface tunnel

·     source

keepalive

Use keepalive to enable GRE keepalive and set the keepalive interval and the keepalive number.

Use undo keepalive to disable GRE keepalive.

Syntax

keepalive [ interval [ times ] ]

undo keepalive

Default

GRE keepalive is disabled.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

interval: Sets the keepalive interval in the range of 1 to 32767 seconds. The default value is 10.

times: Sets the keepalive number in the range of 1 to 255. The default value is 3.

Usage guidelines

This command enables the tunnel interface to send keepalive packets at the specified interval. If the device receives no response from the peer within the timeout time, it shuts down the local tunnel interface. The device brings the local tunnel interface up if it receives a keepalive acknowledgment packet from the peer. The timeout time is the result of multiplying the keepalive interval by the keepalive number.

The device always acknowledges the keepalive packets it receives whether or not GRE keepalive is enabled.

GRE/IPv6 mode tunnel interfaces do not support this command.

Examples

# Enable GRE keepalive, set the keepalive interval to 20 seconds, and set the keepalive number to 5.

<Sysname> system-view

[Sysname] interface tunnel 2 mode gre

[Sysname-Tunnel2] keepalive 20 5

mtu

Use mtu to set the MTU on a tunnel interface.

Use undo mtu to restore the default.

Syntax

mtu size

undo mtu

Default

If the tunnel interface has never been up, the MTU is 64000 bytes.

If the tunnel interface is up, its MTU is identical to the outgoing interface's MTU minus the length of the tunnel headers. The outgoing interface is automatically obtained through routing table lookup based on the tunnel destination address.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

size: Specifies the MTU in the range of 100 to 64000 bytes.

Usage guidelines

After you configure an MTU for a tunnel interface, the configured MTU applies regardless of the tunnel interface status (up/down) and the outgoing interface MTU.

To avoid fragmentation after tunnel encapsulation, set the tunnel interface MTU no greater than the value of the outgoing interface MTU minus the length of the tunnel headers.

Examples

# Set the MTU on interface Tunnel 1 to 10000 bytes.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] mtu 10000

Related commands

display interface tunnel

reset counters interface

Use reset counters interface to clear interface statistics.

Syntax

reset counters interface [ tunnel [ number ] ]

Views

User view

Predefined user roles

network-admin

Parameters

tunnel: Specifies a tunnel interface.

number: Specifies the number of an existing tunnel interface.

Usage guidelines

Use this command to clear old statistics so you can observe new traffic statistics on a tunnel interface.

·     If you do not specify any parameters, this command clears statistics for all interfaces.

·     If you specify only the tunnel keyword, this command clears statistics for all tunnel interfaces.

·     If you specify both the tunnel keyword and the number argument, this command clears statistics for the specified tunnel interface.

Examples

# Clear statistics for interface Tunnel 1.

<Sysname> reset counters interface tunnel 1

Related commands

display interface tunnel

shutdown

Use shutdown to shut down a tunnel interface.

Use undo shutdown to bring up a tunnel interface.

Syntax

shutdown

undo shutdown

Default

The tunnel interface is not in the Administratively DOWN state.

Views

Tunnel interface view

Predefined user roles

network-admin

Usage guidelines

This command disconnects all links set up on the interface. Make sure you fully understand the impact of the command on your network.

Examples

# Shut down interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] shutdown

Related commands

display interface tunnel

source

Use source to specify the source address or source interface for the tunnel interface.

Use undo source to restore the default.

Syntax

source { ip-address | ipv6-address | interface-type interface-number }

undo source

Default

No source address or source interface is specified for the tunnel interface.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the tunnel source IPv4 address.

ipv6-address: Specifies the tunnel source IPv6 address.

interface-type interface-number: Specifies the source interface. The interface must be up and must have an IP address.

Usage guidelines

The specified source address or the address of the specified source interface is used as the source address of tunneled packets. To display the configured tunnel source address, use the display interface tunnel command.

The source address of the local tunnel interface must be the destination address of the peer tunnel interface, and vice versa.

If you execute this command multiple times, the most recent configuration takes effect.

Examples

# Specify VLAN-interface 10 as the source interface of interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1] source vlan-interface 10

# Specify 192.100.1.1 as the source address of interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1] source 192.100.1.1

Related commands

·     destination

·     display interface tunnel

·     interface tunnel

tunnel dfbit enable

Use tunnel dfbit enable to set the Don't Fragment (DF) bit for tunneled packets.

Use undo tunnel dfbit enable to restore the default.

Syntax

tunnel dfbit enable

undo tunnel dfbit enable

Default

The DF bit is not set for tunneled packets.

Views

Tunnel interface view

Predefined user roles

network-admin

Usage guidelines

To avoid fragmentation and delay, set the DF bit for tunneled packets. Make sure the path MTU is larger than the tunneled packet length. To avoid discarding tunneled packets whose length is larger than the path MTU, do not set the DF bit.

This command is not supported on a GRE/IPv6 tunnel interface.

Examples

# Set the DF bit for tunneled packets on interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1] tunnel dfbit enable

tunnel tos

Use tunnel tos to set the ToS of tunneled packets.

Use undo tunnel tos to restore the default.

Syntax

tunnel tos tos-value

undo tunnel tos

Default

The ToS of tunneled packets is the same as the ToS of the original packets.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

tos-value: Specifies the ToS of tunneled packets, in the range of 0 to 255.

Usage guidelines

After you configure this command, all the tunneled packets of different services sent on the tunnel interface will use the same configured ToS. For more information about ToS, see ACL and QoS Configuration Guide.

Examples

# Set the ToS of tunneled packets to 20 on interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1] tunnel tos 20

Related commands

display interface tunnel

tunnel ttl

Use tunnel ttl to set the Time to Live (TTL) of tunneled packets.

Use undo tunnel ttl to restore the default.

Syntax

tunnel ttl ttl-value

undo tunnel ttl

Default

The TTL of tunneled packets is 255.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

ttl-value: Specifies the TTL of tunneled packets, in the range of 1 to 255.

Usage guidelines

The TTL determines the maximum number of hops that the tunneled packets can pass. When the TTL expires, the tunneled packets are discarded to avoid loops.

Examples

# Set the TTL of tunneled packets to 100 on interface Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1] tunnel ttl 100

Related commands

display interface tunnel