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Cisco Catalyst  2960S POE  LLDP  VLAN  ip phones

Posted on 2013-11-20
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Last Modified: 2013-11-21
Please can anyone help me ensure that I can create 3 vlans but use a voice vlan for yea link T28 IP phones.  I have been told I have to use lldp for the phones to be used inline with pcs.

But I can't get the switches to recognise them or the pbx   .......

Thanks for your time
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Question by:Maphew
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6 Comments
 
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Expert Comment

by:RKnebel512
ID: 39664121
lldp should be enabled by default.  But you can use the command "show lldp" to make sure it isn't disabled.  If you are using Cisco phones, the switch will use cdp instead, but that should be enabled as well already.

Are you plugging the phone into the switch, and the PC into the phone?

If not, then just make sure that the interface that the phone is plugged into is on the voice vlan with the interface command "switchport vlan 10" substituting "10" for your voice vlan number.

If you are plugging the pc into the phone and the phone into the switch, then you will need to configure the interface with both vlans using the following commands:
"switchport vlan 5" substituting "5" for the vlan number that your PC is on.
"switchport voice vlan 10" substituting "10" for the vlan number your phone is on.

You will need both commands if both devices are in the same port on the switch.
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Author Comment

by:Maphew
ID: 39664163
Thank you kindly for responding.

I am plugging the phone into switch and PC into phone... Therefore one floor port.

I have tried the voice vlan but still will not recognise. Is there anything I'm missing on set up of a voice vlan over same range of ports as data vlan . Ie do I have to specify anything for the voice vlan and Lldp tlv's.....

Thank you for your time
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Expert Comment

by:RKnebel512
ID: 39664210
Actually I think I missed a keyword in there.  You need to put the word "access" in the first command to tell the switch that there will be both types of traffic.  When you don't, it will assume there is only one type of traffic and not allow the second command.

"switchport access vlan 5" substituting "5" for the vlan number that your PC is on.
"switchport voice vlan 10" substituting "10" for the vlan number your phone is on.

First you will need to take off the other command by typing:
"no switchport vlan 5" substituting "5" for the vlan number that your PC is on.

Make sure you are typing these in at the interface level, so the prompt where you type in should say "(config-if)#"
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Author Comment

by:Maphew
ID: 39666517
Thank you again, do I need to encapsulate using dot1q for both vlans ?
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RKnebel512 earned 500 total points
ID: 39666635
You shouldn't need to.   The encapsulate dot1q command is used for trunk ports.  This interface for your phone going to the phone is kinda like a mini-trunk port in that it will have 2 vlans traveling over the wire, but you will still configure it as an access port since only one data vlan will be allowed.  

I had a switch with a voip phone that was configured like this:

interface FastEthernet0/2
 switchport access vlan 70
 switchport mode access
 switchport voice vlan 75
 spanning-tree portfast
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Author Closing Comment

by:Maphew
ID: 39666975
thank you for your interest and support RKnebel512
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