Table of Contents

Chapter 1 MAC Address Table Configuration Commands. 1-1

1.1 MAC Address Table Configuration Commands. 1-1

1.1.1 display mac-address aging-time. 1-1

1.1.2 display mac-address. 1-2

1.1.3 mac-address. 1-4

1.1.4 mac-address max-mac-count 1-6

1.1.5 mac-address timer 1-7

 

Chapter 1  MAC Address Table Configuration Commands

 

 

1.1  MAC Address Table Configuration Commands

1.1.1  display mac-address aging-time

Syntax

display mac-address aging-time

View

Any view

Parameter

None

Description

Use the display mac-address aging-time command to display the aging time of the dynamic MAC address entries in the MAC address table.

Related command: mac-address, mac-address timer, display mac-address.

Example

# Display the aging time of the dynamic MAC address entries.

<H3C> display mac-address aging-time

Mac address aging time: 300s 

The output information indicates that the aging time of the dynamic MAC address entries is 300 seconds.

<H3C> display mac-address aging-time

Mac address aging time: no-aging

The output information indicates that dynamic MAC address entries do not age out.

1.1.2  display mac-address

Syntax

display mac-address [ display-option ]

View

Any view

Parameter

display-option: Option used to display specific MAC address table information, as described in Table 1-1.

Table 1-1 Description on the display-option argument

Value	Description
mac-address [ vlan vlan-id ]	Displays information about a specified MAC address entry.
{ static | dynamic | blackhole } [ interface interface-type interface-number ] [ vlan vlan-id ] [ count ]	Displays information about dynamic, static, or blackhole MAC address entries.
interface interface-type interface-number [ vlan vlan-id ] [ count ]	Displays information about the MAC address entries concerning a specified port.
vlan vlan-id [ count ]	Displays information about the MAC address entries concerning a specified VLAN.
count	Displays the total number of the MAC address entries maintained by the switch.
statistics	Displays statistics of the MAC address entries maintained by the switch.

 

mac-address: MAC address.

static: Displays static MAC address entries. (A static MAC address entry does not age.)

dynamic: Displays dynamic MAC address entries. (A dynamic MAC address entry ages with time.)

blackhole: Displays blackhole MAC address entries. (A blackhole MAC address entry does not age.)

interface-type: Port type.

interface-number: Port number.

vlan-id: VLAN ID, in the range 1 to 4094.

count: Displays only the total number of the MAC address entries.

statistics: Displays statistics of the MAC address entries maintained by the switch.

Description

Use the display mac-address command to display information about MAC address entries in a MAC address table, including: MAC address, VLAN and port corresponding to the MAC address, the type (static or dynamic) of a MAC address entry, aging time and so on.

Example

# Display the information about the MAC address 00e0-fc01-0101.

<H3C> display mac-address 00e0-fc01-0101

MAC ADDR         VLAN ID STATE          PORT INDEX      AGING TIME(s)

00e0-fc01-0101   1       Learned         Ethernet1/0/1   AGING

# Display the MAC address entries for the port Ethernet1/0/4.

<H3C> display mac-address interface Ethernet 1/0/4

MAC ADDR         VLAN ID   STATE          PORT INDEX               AGING TIME(s)

000d-88f6-44ba  1         Learned        Ethernet1/0/4            AGING

000d-88f7-9f7d  1         Learned        Ethernet1/0/4            AGING

000d-88f7-b094  1         Learned        Ethernet1/0/4            AGING

000f-e200-00cc  1         Learned        Ethernet1/0/4            AGING

000f-e200-2201  1         Learned        Ethernet1/0/4            AGING

000f-e207-f2e0  1         Learned        Ethernet1/0/4            AGING

000f-e209-ecf9  1         Learned        Ethernet1/0/4            AGING

---  7 mac address(es) found on port Ethernet1/0/4 ---   

# Display the total number of MAC address entries found in VLAN 2.

<H3C> display mac-address vlan 2 count

 9 mac address(es) found in vlan 2  

Table 1-2 Description on the fields of the display mac-address command

Field	Description
MAC ADDR	MAC address
VLAN ID	ID of the VLAN to which the network device identified by the MAC address belongs
STATE	The state of the MAC address. The value of this field can be “Static”, “Learned”, and so on.
PORT INDEX	Port index (including port type and port number)
AGING TIME(s)	Indicates whether a MAC address entry is aging

 

# Display statistics about MAC address entries in a MAC address table.

<H3C> display mac-address statistics

MAC TYPE        LEARNED     USER-DEFINED SYSTEM-DEFINED     IN-USE AVAILABLE

Dynamic   Unicast    20          0         0                 20

Static    Unicast    0           1         1             1       256

Total     Unicast                                        21      8192

 

Dynamic Multicast    0           0         0                 0

Static  Multicast 0          0         0            0           256

Total   Multicast                                        0           256  

Table 1-3 Description on the fields of the display mac-address statistics command

Field	Description
MAC TYPE	Type of MAC address
LEARNED	Number of MAC addresses learned by the switch
USER-DEFINED	Number of MAC addresses manually configured by the user
SYSTEM-DEFINED	MAC addresses defined by the switch system, including MAC addresses added with the centralized MAC address authentication function. This type of MAC addresses is not a static MAC address and therefore the number of which is not limited by the total number of the static MAC addresses.
IN-USE	Number of MAC addresses in use
AVAILABLE	Maximum number of MAC addresses supported by the switch

 

1.1.3  mac-address

Syntax

l           In system view:

mac-address { static | dynamic | blackhole } mac-address interface interface-type interface-number vlan vlan-id

undo mac-address [ mac-address-attribute ]

l           In port view:

mac-address { static | dynamic | blackhole } mac-address vlan vlan-id

undo mac-address { static | dynamic | blackhole } mac-address vlan vlan-id

View

System view, port view

Parameter

static: Specifies that the MAC address entry to be added/updated is of static type.

dynamic: Specifies that the MAC address entry to be added/updated is of dynamic type.

blackhole: Specifies the MAC address entry to be added/updated is of blackhole type.

mac-address: MAC address.

interface-type: Port type.

interface-number: Port number.

vlan-id: VLAN ID. This argument ranges from 1 to 4,094.

mac-address-attribute: String used to specify the MAC address entries to be removed, as described in Table 1-4.

Table 1-4 Description on the mac-address-attribute argument

Value	Description
{ static | dynamic | blackhole } interface interface-type interface-number	Removes the static, dynamic, or blackhole MAC address entries concerning a specified port.
{ static | dynamic | blackhole } vlan vlan-id	Removes the static, dynamic, or blackhole MAC address entries concerning a specified VLAN.
{ static | dynamic | blackhole } mac-address [ interface interface-type interface-number ] vlan vlan-id	Removes a specified static, dynamic, or blackhole MAC address entry.
interface interface-type interface-number	Removes all the MAC address entries concerning a specified port.
vlan vlan-id	Removes all the MAC address entries concerning a specified VLAN.
mac-address [ interface interface-type interface-number ] vlan vlan-id	Removes a specified MAC address entry.

 

Description

Use the mac-address command to add/modify a MAC address entry.

Use the undo mac-address command to remove one or more MAC address entries.

When being executed in port view, these two commands only apply to the current port. In this case, the interface keyword is unnecessary.

If the MAC address you input in the mac-address command already exists in the MAC address table, the system will modify the attributes of the corresponding MAC address entry according to your settings in the command.

You can remove all MAC address entries (unicast MAC addresses only) concerning a specific port, or remove a specific type of MAC address entries, such as the addresses learnt by the system, dynamic or static MAC address entries configured, or blackhole addresses.

Example

# Configure a static MAC address entry with the following settings:

l           MAC address: 000f-e20f-0101

l           Outbound port: Ethernet1/0/1 port

l           Ethernet1/0/1 port belongs to VLAN 2.

<H3C> system-view

System View: return to User View with Ctrl+Z.

[H3C] mac-address static 000f-e20f-0101 interface Ethernet 1/0/1 vlan 2

1.1.4  mac-address max-mac-count

Syntax

mac-address max-mac-count count

undo mac-address max-mac-count

View

Ethernet port view

Parameter

count: Maximum number of MAC addresses a port can learn. This argument ranges from 0 to 4,096. A value of 0 disables the port from learning MAC addresses.

Description

Use the mac-address max-mac-count command to set the maximum number of MAC addresses an Ethernet port can learn.

Use the undo mac-address max-mac-count command to cancel the limitation on the number of MAC addresses an Ethernet port can learn.

By default, the number of MAC addresses an Ethernet port can learn is unlimited.

When you use the mac-address max-mac-count command, the port stops learning MAC addresses after the number of MAC addresses it learned reaches the value of the count argument you provided. You can use the undo command to cancel this limit so that the port can learn an unlimited number of MAC addresses. By default, the port learns an unlimited number of MAC addresses.

Related command: mac-address, mac-address timer.

Example

# Set the maximum number of MAC addresses Ethernet1/0/3 port can learn to 600.

<H3C> system-view

System View: return to User View with Ctrl+Z.

[H3C] interface Ethernet 1/0/3 

[H3C-Ethernet1/0/3] mac-address max-mac-count 600

1.1.5  mac-address timer

Syntax

mac-address timer { aging age | no-aging }

undo mac-address timer aging

View

System view

Parameter

aging age: Specifies the aging time (in seconds) for layer 2 dynamic MAC address entries. The age argument ranges from 10 to 1000000 and defaults to 300.

no-aging: Specifies not to age dynamic MAC address entries.

Description

Use the mac-address timer command to set the aging time for dynamic MAC address entries.

Use the undo mac-address timer command to restore the default aging time.

Set the aging time of dynamic MAC address entries as required but ensure that the aging time does not decrease the layer 2 packet forwarding performance of the switch.

l           If the aging time is too short, the MAC address entries that are still valid may be removed. Upon receiving a packet destined for a MAC address that is already removed, the switch broadcasts the packet through all its ports in the VLAN which the packet belongs to. This decreases the operating performance of the switch.

l           If the aging time is too long, MAC address entries may still exist even if they turn invalid. This causes the switch to be unable to update its MAC address table in time. In this case, the MAC address table cannot reflect the position changes of network devices in time.

Example

# Set the aging time of MAC address entries to 500 seconds.

<H3C> system-view

System View: return to User View with Ctrl+Z.    

[H3C] mac-address timer aging 500