Why access mode port channel causing loops

[susim]

What all  are the possiblities a port channel ( all the ports are in access mode )  creates loop in the networks ?

Thank you

[Reza Sharifi]

When one end of an EtherChannel has more members than the other, the unmatched ports enter the standalone state. In a topology that is not protected from Layer 2 loops by the spanning tree protocol (STP), a port in the standalone state can cause significant network errors. For LACP EtherChannels with Release 12.2(33)SXI3 and later releases, you can enter the

port-channel standalone-disable

interface configuration mode command to put ports into the suspended state instead of the standalone state. See the

"Configuring LACP Port-Channel Standalone Disable" section. When one end of an EtherChannel

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/channel.html

HTH

[susim]

When one end of an EtherChannel has more members than the other....

No both end  has same number of members

[Peter Paluch]

Hi,

Reza is absolutely correct. You may be interested to read the following thread:

https://supportforums.cisco.com/message/3241191#3241191

In quite a large scale, we have discussed how an improper configuration of EtherChannels leads to switching loops. Note that it is not important if the EtherChannel operates as an access or a trunk port.

Best regards,

Peter