Voice ports

I have seen this example in quite a bunch of websites. I wonder how can someone determine which ports are voice (Phone)ports and which are PC ports?

Switch#configure terminal
Switch(config)#interface range fa0/2 - 24
Switch(config-if-range)#switchport mode access
Switch(config-if-range)#spanning-tree portfast
Switch(config-if-range)#switchport access vlan 50
Switch(config-if-range)#switchport voice vlan 10
Switch(config-if-range)#end

http://www.ciscopress.com/articles/article.asp?p=1745631&seqNum=3
jskfanAsked:
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José MéndezCommented:
so... if you run a show run interface fas 0/2 and find that the switchport voice vlan command is there, then that port has been prepared to received tagged traffic from an IP Phone and untagged traffic from a possible PC piggybacked to the PC port of the phone.
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agonza07Commented:
Yup, it's just been prepared to have an IP Phone, but it will work if you plug in a computer directly to the port too.

If you connect a phone to the port, then the IP Phone will take VLAN 10, and any PC that is connected to that phone will be on VLAN 50.

If a PC is connected to that port and not piggybacked on a phone, it will simply be on VLAN 50.

Cisco switches and IP Phones use CDP (Cisco Discovery Protocol) to determine what get's connected to that port. If you do a "show cdp neighbor" you will be able to determine which "prepared" ports actually have a Cisco IP Phone connected to it.
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eeRootCommented:
for a config like this, the PC would usually connect to an extra port on the back of the VOIP phone, and the phone connects to the switch.  So they share the same switch port.
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jskfanAuthor Commented:
Thank you
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