VOIP phone VLAN

[Andy White]

Hello,

We have bought 2 VOIP phones to test with, one is by AudioCodes (420HD) the other is by Polycom (CX600).

If I plug the AudioCodes and the phone goes onto VLAN 62 and the PC that connects off it is on VLAN 41, perfect.  However the Polycom stays in VLAN 1 and only goes into VLAN 41, any ideas what is wrong with my config, maybe the phone though....

interface GigabitEthernet2/0/7
switchport access vlan 41
switchport mode access
switchport voice vlan 62
srr-queue bandwidth share 1 30 35 5
priority-queue out
mls qos trust dscp
spanning-tree portfast
spanning-tree bpduguard enable
service-policy input SOFTPHONE-PC
end

Thanks

[Mark Malone]

Hey Andy Cisco port is configured correct and recommended for voip phone theres nothing you need to change there. If you plugged Cisco phone into that config it should work fine , more likely the phone. As you seen the other vendor works fine.

[Mark Malone · Accepted solution]

hmmm see this maybe try lldp instead of cdp might pick up voice

http://community.polycom.com/t5/VoIP/Polycom-CX600-and-cisco-voice-vlan/td-p/7198

[Andy White]

Thanks Mark,

I will try and see how I can configure the port for lldp instead.

[Mark Malone]

lldp is same as cdp just the open source version of it that's becoming more popular these days , that's all you should need below for Cisco port or lldp run in global config

CORE65A(config)#int g1/4/46

CORE65A(config-if)#lldp ?
  med-tlv-select  Selection of LLDP MED TLVs to send
  receive         Enable LLDP reception on interface
  transmit        Enable LLDP transmission on interface
CORE65A(config-if)#lldp receive
CORE65A(config-if)#lldp transmit

[Andy White]

I wonder if it is a global setting, I've enabled on the port, but:

LAN-2960G-01#sh lldp neighbors
% LLDP is not enabled

[Joseph W. Doherty]

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Posting

Older IOSs and/or platforms don't support LLDP.  What's the platform and IOS version?

[Andy White]

Model: WS-C2960X-48FPD-L         

IOS: 15.2(2)E3            

Version: C2960X-UNIVERSALK9-M

[Mark Malone]

does it take the command globally ? would have thought the switch/ios is new enough for lldp

[Andy White]

Will try, will there be any sort of blip or can do during business hours as I have a few 100 users in this stack?

[Mark Malone]

shouldn't be its only discovery protocol same as enabling cdp should not effect prod traffic but it doesn't specifically say in the doc so if you don't want to take the chance just wait if its not critical to get it up and running

Just enabled it on one of my test switches ran constant ping to couple devices connected it didnt drop any pings

[Andy White]

I will set tonight I think and try in the morning again Mark.

[Andy White]

Looks like a global setting is required first, just checking if the stack of switches will blip during this

To disable LLDP, use the no lldp run global configuration command. To disable LLDP on an interface, use the no lldp transmit and the no lldp receive interface configuration commands.

This example shows how to globally enable LLDP.

Switch# configure terminal
Switch(config)# lldp run
Switch(config)# end

This example shows how to enable LLDP on an interface.

Switch# configure terminal
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# lldp transmit
Switch(config-if)# lldp receive
Switch(config-if)# end

[Andy White]

Mark that did the trick!

Thanks

[Mark Malone]

ah great good to know :)