Running different versions in a VRRP/MLAG cluster?

[Chris1]

We're running 15.6.2.12-nopatch, and we've been getting some odd random reboots and ospf issues, so we're looking to move to a new version i guess latest recommended is 15.6.4.2-patchLatest

We run Sets of x670-G2 and x670's in MLAG clusters with VRRP between pairs of them with OSPF.

My question is will i run into any issues if i do the upgrade above on 1 unit, wait a few days make sure all is stable them do the other one? Will this give me a hitless upgrade?

[Patrick_Voss]

Would you explain "eaten from some sites"?

[Chris1]

No no stack, just side by side MLAG'd peers that run VRRP+OSPF for our network, they're connected to seperate set of MLAG'd peers that we use for aggregation. l

Issue we've noticed very low uptime on our switches and from the look of it they randomly restarted, one restarted friday though i'm not sure why theirs no errors in the logs or anything that i can find.

Will take that part up with TAC once we get our contract fixed.

The other issue is something we experienced before, OSPF seems to get eaten from some sites, with 1 side just getting stuck we were told it was a bug from an old version, but it seems to still be happening to us on this version we're running we're hoping its fixed between .2 and .4.

[Patrick_Voss]

Hello Chris,

If you a referring to a stack you will run into issues if you attempt this. A hitless upgrade is never recommended. If they are MLAG peers then you can do this but I am not sure if that is the correct approach considering two switches that are virtually one l2 device may behave differently. Would you elaborate on the issues you have been facing and provide a network topology (including the models)?