3com S7906E 참조 가이드

 

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Use the mac-address mac-learning disable command to disable MAC address learning globally, on 

one or a group of Ethernet ports, or on a Layer-2 aggregate interface, depending on the view you 

entered. 

Use the undo mac-address mac-learning disable command to enable MAC address learning globally, 

on one or a group of Ethernet ports, or on a VLAN, depending on the view you entered. 

By default, MAC address learning is enabled globally and on all Ethernet ports. 

Note that: 

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You may need to disable MAC address learning sometimes to prevent the MAC address table from 

being saturated, for example, when your device is being attacked by a great deal of packets with 

different source MAC addresses. This somewhat affects update of the MAC address table. 

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As disabling MAC address learning may result in broadcast storms, you need to enable broadcast 

storm suppression after you disable MAC address learning on a port. 

Related commands: display mac-address mac-learning. 

 

When MAC address learning is disabled, the learned MAC addresses remain valid until they age out. 

 

# Disable global MAC address learning. 

<Sysname> system-view 

[Sysname] mac-address mac-learning disable 

# Disable MAC address learning on port GigabitEthernet 2/0/1. 

<Sysname> system-view 

[Sysname] interface gigabitethernet 2/0/1 

[Sysname-GigabitEthernet2/0/1] mac-address mac-learning disable 

mac-address max-mac-count count  

Ethernet interface view, port group view 

2: System level