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Feb 02

Cisco 3560 IOS Issue

The following IOS version has issue connecting Cisco 7940 phones on it ports. The switch ports were getting error disabled with warning message of 'loopback detected'. The initial thinking was that its being caused by some inline power misconfig but with nothing much to configure power related on switch, it was ruled out. A lot of time spent troubleshooting, the buggy IOS was pointed as possibility. Upgraded the IOS to a later release and phones started working fine.

Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2)

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