H3C Technologies H3C S12500-X Series Switches - Manual (Page 35)

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Configuring a multiport unicast MAC address entry on an interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter Layer 2 aggregate
interface view:
interface bridge-aggregation
interface-number
N/A
3. Add the interface to a
multiport unicast MAC
address entry.
mac-address multiport
mac-address vlan vlan-id
By default, no multiport unicast
MAC address entry is configured
on an interface.
Make sure you have created the
VLAN and assigned the interface
to the VLAN.
Do not configure an interface as
the output interface of a multiport
unicast MAC address entry if the
interface receives frames destined
for the multiport unicast MAC
address. Otherwise, the frames are
flooded in the VLAN to which they
belong.
Disabling MAC address learning
MAC address learning is enabled by default. To prevent the MAC address table from being saturated
when the device is experiencing attacks, disable MAC address learning. For example, you can disable
MAC address learning to prevent the device from being attacked by a large amount of frames with
different source MAC addresses.
Disabling global MAC address learning
Step Command Remarks
1. Enter system view. system-view N/A
2. Disable global MAC address
learning. undo mac-address mac-learning
enable By default, global MAC address
learning is enabled.
Disabling global MAC address learning disables the learning function on all interfaces.
The global MAC address learning configuration does not take effect in a TRILL network, in a VPLS VSI, or
for an S-channel in an EVB. For information about the TRILL network, see TRILL Configuration Guide. For
information about VSI, see MPLS 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.