Devices at the Two Ends of an Eth-Trunk Cannot Ping Each Other Due to
Inconsistent Aggregation Modes
Fault Symptom
As shown in Figure 3-4, RouterA is an AR2200-S, and RouterB is a non-Huawei device. An
Eth-Trunk consisting of two Ethernet links is configured between the two devices. After the
configuration, the devices cannot ping each other's management IP address.
Figure 3-4 Network diagram of an Eth-Trunk
RouterA RouterB
Eth-Trunk
Eth-Trunk 1
Eth-Trunk 1
Fault Analysis
1. Run the display current-configuration interface eth-trunk command on RouterA and
RouterB. The command outputs show that the Eth-Trunk interfaces on the two ends belong
to the same VLAN.
2. Check the connection between the member interfaces. The member interfaces on RouterA
are correctly connected to the member interfaces on RouterB.
3. Run the display interface command on RouterA and RouterB to check the status of the
member interfaces. All the member interfaces are in Up state.
4. Run the display trunkmembership eth-trunk command on RouterA and RouterB to
check the number of member interfaces in the Eth-Trunk. The two ends contain the same
number of member interfaces.
5. Run the display mac-address command on RouterA and RouterB to check their MAC
address tables. The command outputs show that RouterA learns the MAC address of
RouterB, but RouterB does not learn the MAC address of RouterA. The negotiation
between the two ends may fail. On the network, LACP is enabled on RouterB, but
RouterA uses the manual aggregation mode. RouterA does not respond to the LACP
negotiation request sent by RouterB; therefore, the Eth-Trunk is Down.
Procedure
Step 1 Disable LACP on RouterB.
RouterA and RouterB can ping each other successfully.
----End
Summary
When connecting a Huawei switch to a non-Huawei switch by using an Eth-Trunk, ensure that
the two switches use the same link aggregation mode.
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 3 Physical Connection and Interfaces
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
53
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