Posted on June 17, 2019 10:29 pm
 |  Asked by Donny Parrott
 |  123 views
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I have three switches I am trying to traffic to flow through. 1 is a 7020 and 2 are are 7060s. They form a triangle. Above the 7020 is a firewall/router, below the 7060s are ESXi hosts.

I have found lots of documentation about MLAG between 2 switches, but I can’t find anything for 3 or more. Can anyone educate me if I can add a 3rd port into the MLAG config on each switch so that the 7020 peers with both 7060s and the 7060s peer with the opposite 7060 and 7020?

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Posted by Aesha Parikh
Answered on June 17, 2019 10:41 pm

Hi Donny,

You can have MLAG only between 2 switches. Can you elaborate on why you want 3 switches as MLAG. If I understand this correctly, your setup looks like below:
+——+
| 7020|
| |
+-+–+-+
| |
| |
+——+ +——-+
| |—–| |
|7060 +—–+7060 |
+—–+ +—–+
MLAG

You can configure 2 7060s as MLAG. And configure a port-channel to connect to 7020 to trunk traffic from firewall connected to 7020 to ESXi hosts connected to 7060.

Below link might be helpful.
https://eos.arista.com/mlag-basic-configuration/

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