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Community Member

Caveats to Etherchannel mode "on"

We run our etherchannels between 65xx platforms in "on" mode. This way we don't have to police the allowed VLANS on the trunks and can make VLAN allowed additions/deletions with the trunk and EC staying up. But I've heard that there is a downside to running etherchannel in "on" mode having to do with potential STP loops? Would like to know the detailed explanation. TIA.

William

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Community Member

Re: Caveats to Etherchannel mode "on"

Spanning Tree Protocol sees an EtherChannel as a single port. This presents a danger of creating forwarding loops if channeling ports are not consistent on both sides of the channel. Cisco has developed a special mechanism to detect and disable channel inconsistency to prevent packet duplication, looping, and other issues associated with inconsistent EtherChannels.

Check this URL:

http://www.cisco.com/warp/public/473/127.html

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