topic Re: 9800-40 adding vlan spontaneous reboots in Wireless

9800-40 adding vlan spontaneous reboots

lcaruso — Wed, 28 Dec 2022 20:43:50 GMT

Hi,

I have a pair of 9800-40s running 17.6.4 code in HA SSO Active/Standby Failover VSS With Split Links RMI+RP

When I add a VLan to the trunk to the VSS core from the 9800 side, the primary spontaneously reboots.

Was not the behavior I expected. Anyone else seen this or know why it happens?

Thanks.

Re: 9800-40 adding vlan spontaneous reboots

Scott Fella — Wed, 28 Dec 2022 20:58:31 GMT

Your RMI-RP really should be directly connected or should be on a dedicated vlan that is not routed. Seems like when you make a change SSO is failing over because the RP is loosing connectivity.

Re: 9800-40 adding vlan spontaneous reboots

lcaruso — Wed, 04 Jan 2023 02:00:56 GMT

Scott, you may find this interesting. Adding the vlans to the port channel interface on the 9800-40 HA pair instead of to the physical interfaces solved the issue. That idea was provided by Rasika, https://mrncciew.com/

Re: 9800-40 adding vlan spontaneous reboots

Scott Fella — Wed, 04 Jan 2023 02:59:06 GMT

That is interesting as I would have assumed the vlans in the port channel and interface would have the same configuration. Well that would be a reason that the RMI detected the other was not reachable. Good that you figured that out.

Re: 9800-40 adding vlan spontaneous reboots

lcaruso — Wed, 04 Jan 2023 15:21:06 GMT

Truly interesting since training tells you to always add the vlans under the physical interfaces. We checked afterwards and sure enough the changes were propagated down to the physical interfaces after adding at the port channel level.