Switch Port Configuration for Voice and Data - Best Practice

[znaqvi]

I need to find out what is the best practice to tipical switch port coniguration which connect to Cisco IP Phone and a PC.

I have the follwoing configuration configured:

interface FastEthernet1/0/12

switchport trunk encapsulation dot1q

switchport trunk native vlan 204

switchport trunk allowed vlan 204,205

switchport mode trunk

switchport voice vlan 205

spanning-tree portfast

What do I also need for QoS?

[agopala]

hello!

you should not have encap dot1q. That command will give you lot of issues. It is true that your port will behave like a dot1q trunk, but it is enough if you configure the voice vlan. so your configs should look like this:

interface FastEthernet1/0/12

switchport mode access

switchport voice vlan 205

switch access vlan blah

spanning-tree portfast

for QOS, you have to look at the following doc.. It is fairly straight forward:

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_guide_chapter09186a008014f36e.html

[znaqvi]

THX for the replay,

Can you be little more spacific on what kind of problem I will run into if I configure "encap dot1q"

Thnaks,

[agopala]

I have seen issues where you get an ip address in the data vlan or do not get an ip address at all..

hope that helps.

[Sascha Monteiro]

Hi,

You cannot just have a "tipical" switchport, it really depends on the type you use.

(i.e. 3550, 3560, 3750)

Some will need a trunk configured, some a access port with a voice vlan on it.

Autoqos will set the correct settings.

also have a look at the QOS and CCM SRND's !

http://www.cisco.com/go/srnd/