Posted on April 22, 2015 3:25 pm
 |  Asked by Shailendra Patil PATIL
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Posted by Alexis Dacquay
Answered on April 27, 2015 10:17 pm

Hi Shailendra,

Do you mean all the ports of the port-channels involved in building an MLAG ?

An MLAG creation consist in building a new logical Layer2 interface that is shared across the two MLAG peers. (They synchronised the MAC addresses and more). Compare to what would happen on physical links configured as Port-channel: it’s a new Layer2 interface, MAC would not be preserved either.


Is your concern having single-homed devices (or active-passive) that you try to move onto a dual-homing topology (or active-active) ? It is obviously preferable to start a topology ac active-active dual-homed from the beginning, to avoid any flushing when tearing it down and rebuilding a new Layer2 interface on the top of it (the MLAG.


You could consider is using static MAC entries to preserve your Layer2 forwarding decision.

However you also have to consider Spanning-tree and LACP, which could bring the link to a Layer2 halt during topology change/ turn down or turn up of the link.


I would suggest testing with vEOS Lab (on the Support > Download page), allowing you to load your configuration on your simulated topology, and validate what would work best for you.

But feel free to share more details about what you are trying to achieve, and configs/show commands output to explain your environment.





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