Example on QOS config on Cat3750

[lldemeyer]

Can you point me to a practical example on setting up QOS on Cat3750's . I want QOS to prioritize the outgoing ipphone traffic needing to cross a 'slow' 100Mbps line to another campus . In the Cat3750_IOS_12-2-25SEB config quide there is a lot of info but I am missing practical examples and troubleshooting techniques. Thanks in advance .

[Georg Pauwen]

Hello,

you might want to consider voice VLANs for your IP Phone traffic. Traffic in the voice VLAN is automatically given a precedence and a CoS value of 5, effectively prioritizing that traffic over other traffic coming from e.g. a PC.

The configuration of the switchports where the IP Phones/PCs are connected to would look like this (you might actually be using different VLAN numbers):

3750

!

mls qos

!

interface FastEthernet0/3

switchport access vlan 5

switchport voice vlan 7

mls qos trust cos

Check the following document for detailed information on that feature:

Catalyst 3750 Switch Software Configuration Guide, 12.2(18)SE

Configuring Voice VLAN

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00801f6178.html

HTH,

GP