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Two switches are connected together by two links; STP blocks one link, leaving only one available link to be used between them. What can be done, so both links can forward traffic effectively?
Configure both links in a single VLAN.
Disable STP.
Enable EtherChannel
Configure both ports as root port.
There are only two ways to allow the use of two links at the same time while having STP enabled, one is EtherChannel which bundle multiple links into a single link and the other is to configure different VLANs. EtherChannel treats two or more links as a single link, so STP uses the only link that EtherChannel has made available.
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