topic Re: VRRP Active-Active vs Prio 255 in ExtremeSwitching (EXOS/Switch Engine)

VRRP Active-Active vs Prio 255

MDuRietz — Fri, 18 Jun 2021 17:43:02 GMT

Hi,

I am designing a redundant solution for a datacenter and am setting up a lab in GNS3 to test MLAG and VRRP and I wonder what the advantages / disadvantages are of using VRRP priority 255 instead of Active-Active. From what I can see, it works flawlessly to put prio 255 in both routers and the advantage is that I do not have to allocate 3 IP addresses per subnet.

It will not work correctly if i have to run traffic sourcing from the VRRP vlan, but I do not see that as a problem.
So my question is what am I missing? Why should i use Active-Active and mot priority 255?

Thanks!

/Mattias

Re: VRRP Active-Active vs Prio 255

CThompsonEXOS — Fri, 02 Jul 2021 20:14:50 GMT

Hi,

Generally we see Active-Active in MLAG configurations which can be done via acl on both ends of the ISC link:

entry vrrp-act {
if match all {
destination-address 224.0.0.18/32 ;
} then {
deny ;
}
}

It can also be done via fabric routing:

https://extremeportal.force.com/ExtrArticleDetail?an=000080659

Thanks,

Chris Thompson

Re: VRRP Active-Active vs Prio 255

MDuRietz — Mon, 05 Jul 2021 14:58:48 GMT

Hi,

Thank you for your reply.

So in other words, it is not recommended to use prio=255 instead of active-active?

Thanks,

Mattias