How a loop shape in a misconfigured Etherchannel?

Dear friends,

It is a question frequently observed and practically proven that if both switches are interconnected by a number of parallel links that are grouped in an Etherchannel on a switch (of course, using the mode on ) while being unbundled on the second switch, a loop of Layer2 may well be created. However, I do not understand the exact mechanism of the formation of this loop.

I am well aware of the basic principles behind: I know that STP treats interface Port-Channel as a single interface, and all Member links grouped in that Etherchannel share the same role/State PLEASE. I also understand that a frame of broadcast/multicast/unknown unicast sent by a port in the Etherchannel will reach the switch in front and cross flooded all the other links, arriving finally at the switch with the Etherchannel configuration.

And right there, that is where my understanding ends: the framework came back and its destination is still unknown. However, from the point of view of the switch, the frame came in through a specific Port-Channel interface. If this switch flooding the frame, there he will flood through all ports except the port through which the framework was, which means that the frame will never sent through the Port-Channel. How the loop is created, then?

Thank you so much for helping me with this!

Best regards

Peter

Peter,

The packages will be flooded with all interfaces for unknown broadcast/unicast packets with the exception of the interface when the flood came.

In a 2 switch topology, switch A (which has the bundle) will flood the package on the members of the group waiting B switch to receive the package on its package.

However, switch B will not receive the package on one of its physical interfaces and may experience flooding to B switch off its other physical interface connected which causes the STP loop.

Kind regards

Edison.

Tags: Cisco Network

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