Good day fellow IT peoples. I’m working on troubleshooting an issue with a set of Cisco switches I have. I’ve had to pull them from three sites and now have them setup on my lab bench due to them having seemingly random reboots. Uptime varies anywhere from as low as 3 hours to as long as 4 days, most often somewhere between 6-14 hours. They do not reboot at the same time.
The only commonality I can see is that we use Mikrotik routers at all of our sites.
Cisco TAC is investigating from their side, but they are unfamiliar with one of the errors in the debug log, so I thought while I was waiting for them to investigate, I’d post here and see if it’s something Mikrotik specific.
They’re leaning towards a negotiation issue between the switches and the Mikrotik routers in use.
The lab bench is setup as follows:
Mikrotik Router with a default config (changed IP and network scope to 172.16.50.0/24).
–Ether 4 connected to Switch 1 (port 24)
–Ether 5 connected to Switch 2 (port 24)
All plugged into a known good UPS.
The main log message (on the switches) they were looking at was %MCAST-7-GROUP_RANGE-INVALID: Received invalid group range 224.0.0.X
I haven’t been able to find much about this error anywhere other than a random kb for palo alto’s. It seems this should be the reserved local multicast range, but I know next to nothing about how multicast works.
Any help or thoughts would be greatly appreciated!
