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Etherchannel Backup port

I have cisco switch connected to non cisco switches in Multichasis etherchannel.But when i see portchannel spanning tree status on cisco side for vlans it shows port-channel for eg int pol25 as backup port with BLK status.

How can we force it to become designated fwding.Backup ports are created when you combine ports in p2p config and also if you have multiple ports conecting to same segment and if ports recieve BPDU from the switch it is on.????

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