Okay, we've had this happen twice now, so it was not a fluke. Here's the situation:
We have 3 Cat 3524XL switches all running the same IOS 12.0(5)WC7. We also have 2 Cat 3550-48 switches running 12.1(11) and 12.1(13) IOS.
The are all hooked together in a cascaded redundant loop fashion with gbic cables and modules. One of the switches has a fiber uplink to another closet.
Well, yesterday at about 4:50PM, the switches all appeared to lock up - or maybe go into a loop? One of the GBIC ports was still blocked, so I don't think it was a loop. We lost all network connectivity for that closet and floor. Other closets were unaffected.
When I unplugged a GBIC cable and plugged it back in again, the switches came back alive and all was good.
I suppose putting both 3550's to the same IOS might be the fix, but I'm not convinced. If that is the problem, it sure has a strange way of showing itself and fixing itself. And we've been running this way for months.
Any other options as to what might be wrong? I already verified that all ports had portfast disabled.
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...