Arista MLAG Configuration

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mot

New Member
Dec 25, 2024
4
1
3
Hello everyone
I need to confiure mlag between 4 swithces , it will look like this1736421652799.png
now the question is:
1. can I have the same vlan ID for mlag peer for all swithces? , for ex. vlan4094 for mlag configuration between arista1-2 , arista 1-3, arista 2-4 , will there be a problem or not , and why?
2.will it be problem if i configure the same port-channel for all swithces (mlag conf), If it is a problem then how would arista 3 "speak" with arista4 ?
 

zunder1990

Active Member
Nov 15, 2012
230
80
28
That is not how you need to cable them.
The cabling between sw1 and sw2 is fine
sw 2 needs one cable sw4 and one cable to sw3
sw 1 needs one cable sw4 and one cable to sw3

mlag config only needs to be on sw1/sw2.

sw2/4 get normal lag as they think sw1/2 are the same switch.