We have recently put to (production) service an CISCO2951-HSEC+/K9 with IOS v15.5(1)T2.
Due to occasional awkward symptoms (CPU unexpectedly hitting 100%) we decided to upgrade to latest suggested (as I understand) version: v15.5(3)M2.
(Cisco recommendation: https://software.cisco.com/download/release.html?mdfid=282774230&dwnld=true&softwareid=280805680&catid=268437899&rellifecycle=MD&atcFlag=N&sortparam=&release=15.0.1M3&dwldImageGuid=A917D58FF24E08471C560BF4F6F5848665350623)
However, after upgrade, although the image was loaded successfully and we had remote access to the router (from a neighboring router, using SSH to its Loopback address), it seemed that all regular traffic was stopped. The LANs behind the router were not accessible from anywhere, and could not access any destination either. However, the routing table appeared OK.
We were obliged to load the initial boot image to return to a working condition. Since this is a production router (and we don't have a backup either), I didn't have more time to experiment. Unfortunately, I was not prepared to keep a "show tech-support" log, so I can't report more details at this point.
Can anyone suggest a reason for this behavior?
Do licenses continue to be valid after upgrades? This router is licensed for:
SL-29-IPB-K9 IP BASE LIC -CISCO 2901-2951
SL-29-SEC-K9 SECURITY LIC FORCISCO2901-2951
FL-29-HSEC-K9 CISCO FL-29-HSEC-K9 LICENSE
L-FL-SSLVPN10-K9= CISCO IOS SSL VPN LICENCE
I have been doing router IOS upgrades with versions 12.x for years and didn't have such issues, but it's the first time I do a router IOS upgrade with v15x.
Am I missing something? Please help.
Thanks,
Nick
