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Thursday, November 19, 2009

What happens to traffic/spanning-tree when a link in an etherchannel fails?

If single physical interface that member of the etherchannel fails, traffic will be redirected to the second physical link and Etherchannel is still Active. Removal of a physical link from an Etherchannel bundle will result in a different bandwidth of the entire bundle and thus in a different link cost of the Port-channel interface. If the Port-channel interface was the root port, the root path cost of the switch will increase. As a result, the spanning tree on that switch or on other switches may select a different root port - this depends on the topology of the network.

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