3com S7906E Guía De Referencia
1-6
Parameters
None
Description
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:
z
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.
z
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.
Examples
# 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
Syntax
mac-address max-mac-count count
undo mac-address max-mac-count
View
Ethernet interface view, port group view
Default Level
2: System level