12-30-2010 08:22 AM - edited 03-06-2019 02:45 PM
I ran into an interesting problem yesterday.
WS-C4503-E switch containing a Supervisor 6L-E in slot1 and WS-X4648-RJ45V+E in slots 2 and 3. A user moved from one office to another and brought her 7942G phone (running SCCP42.9-0-3S) with her to her new office. When she plugged it in, it would start to boot up, but wouldn't stay powered on for more than a few seconds.
In troubleshooting the issue, a technician unplugged a working phone from a nearby office on the same switch and got the same behaviour. When she plugged the originally working phone back in, it also failed to boot up, exhibiting the same symptoms as the other phone.
I discovered that both of these phones were plugged into blade 2. When I plugged them into blade 3, they both started normally. Port configurations are identical:
old:
interface GigabitEthernet2/34
switchport access vlan 101
switchport mode access
switchport voice vlan 72
auto qos voip cisco-phone
qos trust device cisco-phone
spanning-tree portfast
end
new:
interface GigabitEthernet3/34
switchport access vlan 101
switchport mode access
switchport voice vlan 72
auto qos voip cisco-phone
qos trust device cisco-phone
spanning-tree portfast
end
12-30-2010 12:54 PM
When you plug the phones in blade 2, do you see any error being logged on the switch?
Have you run a diganostic on blade 2?
12-30-2010 01:30 PM
No errors are logged on the switch when phones are plugged into blade 2 (using 'show log').
What kind of diagnostic do you mean?
12-30-2010 01:58 PM
There should be a diagnostic command
diagnostic start module 2 ?
Be careful, because some times diagnostic tools are intrusive to the network.
If not, may be reseating the module could be the next step
HTH
Reza
12-30-2010 07:42 PM
Plug the phone back in and run a TDR against it.
The commands are:
1. test cable tdr interface
2. Wait for about 10 seconds and run the next command.
3. sh cable tdr interface
Please post the result.
02-16-2011 04:55 PM
Edward,
We experienced the same issue with a 4506-E switch with a supervisor 6L-E in slot1 and WS-X4648-RJ45V+E in slots 2 and 3. The issue that we had was with a 7940 VOIP phone. It would not get power from module 2 but would work fine from module 3, other models of phones such as the 7942G's would work fine in module 2. All the configurations on the switchports were identical and the phone would also work on another 4506-E with the same IOS and configuration of line cards in module 2?
We resolved our issue by removing the module in slot 2 and re-seating it. This then was able to power the phone, not too sure as to what the root cause of the issue was but it resolved the problem for us.
Hope this sorts out the issue for you.
Regards,
Dilip Ratna
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