C9300 staking with CS 17.2.3. Failover status change

[Ste]

Dear Community,

I'm reaching out to seek some insights regarding an issue I'm experiencing with my network setup. I have two C9300 Meraki Mode switches in a stack, running on CS 17.2.3 software. These switches are configured as core switches with routing enabled.

While experimenting with failover, I noticed a peculiar behavior. When I power off the master switch, the failover occurs almost instantly, and we momentarily lose one or two pings through the L3 interfaces and L2 VLANs. However, after about two minutes, the network experiences a complete downtime lasting approximately one minute. Interestingly, this issue does not occur when the standby switch is powered off.

Can someone please explain if this behavior is normal due stack election or is an issue? Any insights or suggestions to resolve this would be greatly appreciated.

Thank you

[alemabrahao]

As far as I know, this is expected.

Re: Failover on C9300 physical stack - The Meraki Community

[Brash]

As @alemabrahao indicated, it certainly seems to be a seen behaviour.

It's feasible that the issue may be due to the following known issue:

• Link aggregates may take some time to be reinitialized when a switch stack failover occurs. During this time traffic traversing the link aggregate will be interrupted.

From what I can tell, that known issue doesn't seem to be present in the 17.5.4 release notes, so it may be fixed there. However, I don't think anyone in the community has performed the testing to validate that.