Loops in MLAG

[abdul.qadir5001]

How loops are avoided in MLAG? Please need your support. Thanks

[balaji.bandi]

Not sure what is the context here, but if you configure LACP, i do not see any Loops here technically, (but overall network may have other loops like STP)

we need more clarity to address the issue.

[Giuseppe Larosa]

Hello @abdul.qadir5001 ,

in MLAG   that we can explain as multi chassis etherchannel using LACP the pair of devices that build the MLAG pretend to be a single device using a single system ID and using LACP messages on each member links.

On the other side of the MLAG the device does not know that some member links are terminated in one device and others are terminated in the second devices.

There is no risk of loop. For STP this is a single logical link . STP BPDUs can be sent over a single member link per direction, LACP frames are exchanged over each member link and LACP can detect a failure in a member link.

This concept applies to VSS pair or  VSL or a stack.

Hope to help

Giuseppe