we are having cisco 2960 switch in our network and we are connected 7902 IP Phone and phones are working but when phone power on and off then that port is down and shown that err-disable, we are also do duplex setting on that port stil we are having same problem so how we can resolve this issues ???
If you have enabled errdisable recovery, you can determine the reason for the errdisable status if you issue the show errdisable recovery command. Here is an example:
cat6knative#show errdisable recovery
ErrDisable Reason Timer Status
Timer interval: 300 seconds
Interfaces that will be enabled at the next timeout:
Interface Errdisable reason Time left(sec)
--------- --------------------- --------------
Fa2/4 bpduguard 273
One you find the reason, you will be able to fix it.
I cheked "sh int status err-disabled "
and shown that reason "loopback" on interface but the thing is that port coonected to cisco 7902 IP Phone .
A loopback error occurs when the keepalive packet is looped back to the port that sent the keepalive. The switch sends keepalives out all the interfaces by default. A device can loop the packets back to the source interface, which usually occurs because there is a logical loop in the network that the spanning tree has not blocked. The source interface receives the keepalive packet that it sent out, and the switch disables the interface (errdisable). This message occurs because the keepalive packet is looped back to the port that sent the keepalive:
Is the phone directly connected to the switch?
can you post STP related config + interface config
Yes IP phone directly connected to switch and particular that port we are facing problem.? can you advice me which type of configuration i have to do ?
for access port
if a pc is connected to the phone and in a different vlan
switchport mode access
spanning-tree bpdugard enable
switchport access vlan x
switchport voice vlan y
it looks like this is your problem (old document from 2004); 2960 switch is not listed as affected device.
Which IOS are you running?
Thank you for this but problem is that we have connected only IPPhone there is no pc ot like that ...only one IPPhone 7902 connected.