VoIP Phone – Switchport Config

29 Jul

mrn-cciew

Let’s see how we can configure a switchport connected to VoIP phone. Here is my setup for this post.

VoIP-CDP-00

Here is the SPAN configuration.

monitor session 1 source interface Fa1/0/7monitor session 1 destination interface Fa1/0/9 encapsulation replicate
!
interface FastEthernet1/0/9
 description BACKTRACK

First we will configure as a simple access vlan & see what’s  happen.

interface FastEthernet1/0/7
 description VOIP PHONE
 switchport mode access
 switchport access vlan 130
 spanning-tree portfast

If you look at a packet capture in this scenario, you would see a CDP packets send by both Phone & Switch.

VoIP-CDP-01

Here is the CDP information send by Switch.

VoIP-CDP-02

Here is the information send by phone via CDP. As you can see phone will inform power requirement via CDP. Therefore it is very important to have CDP enable on these switch port where you connect VoIP phones (this applies to any cisco PoE devices like AP, Camera, etc)

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