Customer has a new CMBE 6.1. Network consists of 2-3560 switches and a 2851 router/gateway. The 2851 is running srst. Twice in the past 2 weeks, a single phone has gone into SRST mode while all other phones have remained registered to cmbe.
The phone in srst is connected to the core 3560 which also has the cmbe and the 2851 connected.
Both times customer has unplugged the phone and reconnected it and it then registers with cmbe.
Anyone have any idea what might be happening?
Switch ports look clean with no drops or buffer overruns.
Is this phone getting DHCP addressing or static? Is it possible that it's IP address is being blocked by an ACL. And what does the config look like for that switch port? Are you using a seperate voice VLAN?
I would be very leery of the port-security commands. That would explain how it happens after the phone has been working for a while. Does someone have a desktop switch or hub plugged into the PC port of this phone or a PC that is emulating multiple MAC addresses. I'm thinking the combination of secure MAC aging and limiting the MACs to 3 might be the cause.
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