09-01-2007 08:16 AM - edited 03-14-2019 11:20 PM
We have cisco cat 3750 with Ip phones configured on some ports as below..frequently these phones 76x do not acquire addresses or do not work...(ip helper address configured on SVI)..could anyone guide as to how to go about troubleshooting what could be causing this ..it often solves by resetting the native VLAN( we cannot use aux vlan config in this environ just yet)
switchport access vlan xxx
switchport trunk encapsulation dot1q
switchport trunk native vlan xxx
switchport trunk allowed vlan yyy,xxx
switchport mode trunk
speed 100
duplex full
Pointers appreciated
09-01-2007 10:17 AM
Can you confirm that you have configured VLAN, Speed and Duplex on the phone ??
09-01-2007 10:38 AM
Hi Mahesh and Mahesh :)
I don't see;
switchport voice vlan YYY
Rob
09-01-2007 10:38 AM
Hi Mahesh and Mahesh :)
Sorry for second post
Rob
09-01-2007 12:19 PM
Rob, to answer this Mahesh, the reason it is not mentioned is coz the Post states:
( we cannot use aux vlan config in this environ just yet)
So, with the aux/voice vlan not being an option, we need to do a Manual config :-)
09-01-2007 08:49 PM
Yes the same have been configured ...just would like to know how to go about troubleshooting the same as everytime it starts working after resetting the native VLAn to some oher VLAN and then back to old native VLAn and Lo it starts working
And yes we cannot use voice Vlan in this etup as yet
Thanks and regards
09-03-2007 12:48 AM
Hi,
For troubleshooting, you can try configuring Voice VLAN as a access VLAN and see whether Phones are taking the IP address, with the above configuration give static IP.
Karuna
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