10-24-2008 12:39 PM - edited 03-15-2019 02:09 PM
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.
Rob
10-24-2008 12:46 PM
I strongly recommend you to connect the phone on a different port for test purposes, if possible also replace the cable. Since the problem is only with one phone we need to narrow down the problem.
How often is the problem happening?
10-24-2008 01:09 PM
It has happened 2x in the past 3 weeks and it was with different phones which would seem to eliminate the port/cable as being the issue.
Rob
10-24-2008 12:50 PM
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?
10-24-2008 01:11 PM
phone gets dhcp.
there are no acl's for phones.
there is a seperate voice vlan
typical port config:
interface GigabitEthernet0/35
switchport access vlan 10
switchport mode access
switchport voice vlan 14
switchport port-security maximum 3
switchport port-security aging time 2
switchport port-security violation restrict
switchport port-security aging type inactivity
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
spanning-tree portfast
Rob
10-24-2008 01:20 PM
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.
10-24-2008 02:01 PM
thanks
good point - I'll check it out
10-27-2008 06:17 AM
Gys:
neither of the phones that went into srst were connected into a hub. In fact, the pc connected to the phone never lost network connectivity.
The gateway log shows the phone registering but there is nothing unusual in the switch log.
strange
Rob
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