HP 5900 series Command Reference Manual page 62

Syntax
mac-address mac-learning enable
undo mac-address mac-learning enable
Default
MAC address learning is enabled.
Views
System view, VLAN view, Ethernet interface view, aggregate interface view, S-channel interface view
Predefined user roles
network-admin
Usage guidelines
To prevent the MAC address table from becoming saturated, you can disable MAC address learning.
For example, a number of packets with different source MAC addresses reaching a device can affect the
MAC address table update. You can disable MAC address learning to avoid such attacks, but the
following guidelines apply:
You can disable MAC address learning on a per-interface basis. If you disable MAC address
•
learning globally, MAC address learning is disabled for all interfaces, and the device stops
learning MAC addresses and cannot dynamically update the MAC address table.
Because disabling MAC address learning can result in broadcast storms, enable broadcast storm
•
suppression after you disable MAC address learning on an interface. For more information about
broadcast storm suppression, see "Layer 2—LAN Switching Configuration Guide."
With MAC address learning enabled globally, you can disable MAC address learning for the
•
specific interface or VLAN.
This command does not take effect in a TRILL network, or for an S-channel in an EVB. For information
about TRILL, see TRILL Configuration Guide. For information about S-channel and EVB, see EVB
Configuration Guide.
When MAC address learning is disabled, the learned MAC addresses remain valid until they age out.
Examples
# Disable MAC address learning globally.
<Sysname> system-view
[Sysname] undo mac-address mac-learning enable
# Disable MAC address learning for VLAN 10.
<Sysname> system-view
[Sysname] vlan 10
[Sysname-vlan10] undo mac-address mac-learning enable
# Disable MAC address learning on interface Ten-GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface ten-gigabitethernet 1/0/1
[Sysname-Ten-GigabitEthernet1/0/1] undo mac-address mac-learning enable
# Disable MAC address learning on interface Bridge-Aggregation 1.
<Sysname> system-view
[Sysname] interface bridge-aggregation 1
[Sysname-Bridge-Aggregation1] undo mac-address mac-learning enable
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