3.1 Eth-Trunk Interface Troubleshooting
This chapter describes common causes of Eth-Trunk interface faults, and provides the
corresponding troubleshooting flowcharts, troubleshooting procedures, alarms, and logs.
3.1.1 Eth-Trunk Interface Cannot Forward Traffic
This section describes the troubleshooting flowchart and provides a step-by-step troubleshooting
procedure for the fault that an Eth-Trunk interface cannot forward traffic.
Common Causes
After an Eth-Trunk interface is configured, it cannot forward traffic.
This fault is commonly caused by one of the following:
l Eth-Trunk member interfaces are faulty.
l Configurations of Eth-Trunk member interfaces on the two ends are inconsistent.
l The number of Up Eth-Trunk member interfaces is smaller than the lower threshold.
l Negotiation between member interfaces of the Eth-Trunk interface in static LACP mode
fails.
Troubleshooting Flowchart
On the network shown in Figure 3-1, the Eth-Trunk interface cannot forward traffic.
Figure 3-1 Eth-Trunk network diagram
RouterB
Eth2/0/2
Eth-Trunk1
RouterA
Eth2/0/3
Eth2/0/3
Eth2/0/1 Eth2/0/1
Eth2/0/2
The troubleshooting roadmap is as follows:
l Check that Eth-Trunk member interfaces are working.
l Check information about Eth-Trunk member interfaces on both ends.
l Check that the number of Up member interfaces is greater than the configured lower
threshold.
l Check that LACP negotiation succeeds if the Eth-Trunk interface is in static LACP mode.
Figure 3-2 shows the troubleshooting flowchart.
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.
47
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