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What is the backup port in spanning tree?In which scenario we will be able to see a backup port role on a swichport?
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Switch 1 will send BPDU from port 0/1 & 0/2. But Switch 2 will receive the BPDU transmitted from 0/1 of Switch because that port is elected as DP forwarding. The port 0/2 on Switch 1 is backup port because it will transition as DP forwarding in case if port 0/1 on switch 1 is no longer active.

In conclusion, a port which provides backup to DP port is called Backup port.