Posted on May 10, 2016 2:03 pm
 |  Asked by Ronald David Hurtado Ulfe
 |  1200 views
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Posted by Roberto Salazar
Answered on May 10, 2016 6:46 pm

MLAG is similar to VSS that both allows multi-chassis link aggregation.

 

For more on MLAG:

https://eos.arista.com/mlag-basic-configuration/

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Posted by Michael Butash
Answered on May 11, 2016 12:00 am

Cluster two switches to act as one? I’m pretty sure they don’t, as most time and time again reasons for not doing so tend to outweigh those for.

Simplification really isn’t well achieved with VSS strategies, short of having one less device to manage, at least ala cat6k.  You outweigh this (over) simplification with bugs, feature oddities, upgrade woes (anyone ever seen issu actually work?), etc that imho aren’t attractive in the least.  I understand things like hardening stp, routing, automation, management, don’t really worry about using extra ip’s for fhrp use, so meh, why bother.

Take something like fex or stacking technologies, and you now get same bugs, more upgrade woes, and added features like head of line blocking issues that make them useless other than as low-end host ports for hosts hopefully having lots of tolerance for lossy behaviour.  All again in the name of simplification.

MLAG is more than suitable for accomplishing the primary goal of vss, to allow active/active L2 forwarding as long as you’re using modern hosts that can support LACP.  Same as VPC fundamentally, less encumbered.

I’ve been through those gyrations with Cisco throughout history with VSS, stacking, etc. that I’m good with avoiding their ”features” for good old L2/3 protocols.  Guess it depends on your definition of ”simple”.

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