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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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How Is Network Flapping Due to Eth-Trunk Member Interface Change Prevented?

How Is Network Flapping Due to Eth-Trunk Member Interface Change Prevented?

When some Eth-Trunk member interfaces go Up or Down, the path cost of the Eth-Trunk will change. STP recalculates the path cost, causing the network topology change. Then STP recalculates the spanning tree, resulting in network flapping.

Run the stp [ process process-id ] [ instance instance-id ] cost cost command in the Eth-Trunk interface view to set the path cost of the Eth-Trunk to a fixed value. Then member interface change does not affect the path cost of the Eth-Trunk, and the network topology is not affected.

For example, set the path cost of the Eth-Trunk to 200.
<HUAWEI> system-view
[~HUAWEI] interface eth-trunk 1
[*HUAWEI-Eth-Trunk1] stp cost 200
[*HUAWEI-Eth-Trunk1] commit
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Updated: 2020-01-07

Document ID: EDOC1000060766

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