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

Created Nov 19, 2016 23:59:28Latest reply Nov 20, 2016 00:05:02 1027 1 0 0

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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user_2790689  Expert   Created Nov 20, 2016 00:05:02 Helpful(0) Helpful(0)

thank you
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