l Blackhole MAC address entries and MAC address learning limit are configured on the
interface.
l The number of learned MAC addresses exceeds the maximum.
Troubleshooting Flowchart
MAC address entries cannot be generated on the device, so Layer 2 forwarding fails.
The troubleshooting roadmap is as follows:
l Check the binding relationship between the outbound interface and the VLAN.
l Check whether a loop occurs on the network.
l Check whether the configurations on the interface conflict or MAC address learning limit
is configured on the interface.
l Check whether the number of learned MAC addresses exceeds the limit.
Figure 4-2 shows the troubleshooting flowchart.
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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