Huawei V200R001C01 - Page 345

Data Packets Are Discarded on a VRRP Network
Fault Symptom
As shown in Figure 11-8, a VRRP backup group is configured on RouterA and RouterB.
RouterA functions as a master device and RouterB functions as a backup device. RouterC, as a
switch, connects RouterA and RouterB.
Figure 11-8 VRRP networking diagram
RouterA
RouterB
RouterC
RouterD
GE0/0/1
GE0/0/1
Eth2/0/0
Eth2/0/1
Eth2/0/2
Eth-trunk
RouterE
After the preceding configurations are complete, a large number of packets sent from RouterE
to RouterD are discarded.
Fault Analysis
1. Run the display vrrp [ interface interface-type interface-number ] [ virtual-router-id ]
statistics command on RouterA and RouterB to view the traffic on GE0/0/1 on RouterA
and GE0/0/1 on RouterB. A small volume of traffic is transmitted on GE0/0/1 of RouterA,
and no traffic is transmitted on GE0/0/1 of RouterB.
Run the display interface counters command on RouterC to view traffic on Eth2/0/0,
Eth2/0/1, and Eth2/0/2. A small volume of traffic is transmitted on Eth2/0/1 and no traffic
is transmitted on Eth2/0/2, while a large volume of traffic is transmitted on Eth2/0/0. This
indicates that traffic has been discarded on RouterC.
2. Run the display mac-address dynamic command on RouterC to check MAC addresses.
Based on the command output, the learned MAC address of RouterA is sent by Eth2/0/0
but not Eth2/0/1 connected to RouterA or Eth2/0/2 connected to RouterB, indicating that
the learned MAC address is incorrect.
MAC address table of slot
1:
------------------------------------------------------------------------------
-
MAC Address VLAN/ PEVLAN CEVLAN Port Type
LSP/
VSI/SI MAC-
Tunnel
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 11 Reliability
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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