2950 Switch - Port Confused (This was a strange one!)
I've now seen the strangest thing ever on one of our switches. Earlier today we had a section of one of our schools lose wired and wireless connectivity. I checked and saw that one of our switches had stopped responding and appeared offline.
Logging into a neighboring switch the trunk port (gi0/2) was showing up/up. Ok wierd. So I went out to the site and consoled into the 'down' switch. It's trunk port (also Gi0/2) was also showing up/up. I unplugged the cable from gi0/2 and my console showed Fa0/24 going down/down. Huh? I plugged it back into Gi0/2 and console reported Fa0/24 going up/up.
Totally baffled now, I configured the empty Gi0/1 as a trunk and connect the cable to that port instead. The console showed Fa0/24 go down/down and then Fa0/17 come up/up! Yet still no connectivity/visibility to the next upstream switch.
I reloaded the switch from the console, not saving any changes I had made, and it came back up - now connected and able to see the next switch.
Is this a sign of the switch giving up the ghost? Has anyone experienced a switch getting it's own ports confused like this?
Even if I can't really 'fix' it, it's one of the funniest things I've ever seen a Cisco switch do. :)
Re: 2950 Switch - Port Confused (This was a strange one!)
Sounds like you have some physical loop somewhere , this can easily take down the whole switch . It's possible when you reloaded that spanning tree was able to resolve that loop and put the ports into a blocking state. Try a "show spanning tree blockedports" command and see if there are any ports in a blocked state.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...