Huawei V200R001C01 - Page 73

MAC Address VLAN/Bridge Learned-From Type
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0025-9e80-2494 1/- Eth 2/0/1 dynamic
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If not, re-configure the binding relationships between the MAC address, VLAN, and interface.
If so, go to Step 2.
Step 2 Check whether a loop on the network causes MAC address flapping.
If a loop exists on the network, use either of the following methods to prevent MAC address
flapping:
l Remove the loop from the network.
l Run the loop-detect eth-loop command in the VLAN view to enable the MAC flapping
detection function. The AR2200-S checks whether a MAC address moves from one
interface to another in the VLAN. If MAC address flapping occurs, the AR2200-S blocks
the interface or MAC address.
If no loop exists, go to Step 3.
Step 3 Check that MAC address learning is enabled.
Check whether MAC address learning is enabled in the interface view and the VLAN view.
[Huawei-Ethernet2/0/1] display this
#
interface Ethernet2/0/1
mac-address learning disable
port hybrid tagged vlan 10
undo negotiation auto
#
return
[Huawei-vlan10] display this
#
vlan 10
mac-address learning disable
#
return
If the command output contains mac-address learning disable, MAC address learning is
disabled on the interface or VLAN.
l If MAC address learning is disabled, run the undo mac-address learning disable
command in the interface view or VLAN view to enable MAC address learning.
l If MAC address learning is enabled on the interface, go to Step 4.
Step 4 Check whether any blackhole MAC address entry or MAC address limiting is configured.
If a blackhole MAC address entry or MAC address limiting is configured, the interface discards
packets.
1. Run the display mac-address blackhole command to check whether any blackhole MAC
address entry is configured.
[Huawei] display mac-address
blackhole
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MAC Address VLAN/Bridge Learned-From
Type
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Huawei AR2200-S Series Enterprise Routers
Troubleshooting 4 LAN
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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