3com 8807 User Guide

C

HAPTER

 16: MAC A

DDRESS

 T

ABLE

 M

ANAGEMENT

You can configure (add or modify) the MAC address entries manually according to 
the actual networking environment. The entries can be static ones or dynamic 
ones.

The following sections describe the MAC address table management 
configuration tasks.

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Administrators can manually add, modify, or delete the entries in MAC address 
table according to the actual needs. They can also delete all the (unicast) MAC 
address table entries related to a specified port or delete a specified type of 
entries, such as dynamic entries or static entries.

You can use the following commands to add, modify, or delete the entries in MAC 
address table.

Perform the following configuration in system view.

The setting of an appropriate aging time can effectively implement the function of 
MAC address aging. Too long or too short aging time set by subscribers will cause 
the problem that the switch broadcasts a great amount of data packets without 
MAC addresses, which will affect the switch operation performance.

If aging time is set too long, the switch will store a great number of out-of-date 
MAC address tables. This will consume MAC address table resources and the 
switch will not be able to update MAC address table according to the network 
change.

If aging time is set too short, the switch may delete valid MAC address table.

You can use the following commands to set the MAC address aging time for the 
system.

Perform the following configuration in system view.

Table 98   Set MAC address table entries

Add/Modify an address entry 

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

Delete an address entry 

undo mac-address [ static | dynamic ] [ mac-addr [ 
interface interface-type interface-number ] vlan vlan-id | 
interface interface-type interface-number | vlan vlan-id ]