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3550, prioritize traffic based on cos value?

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dodeesos

IS-IT--Management
Jan 3, 2007
17
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Hi!

I need help on configuring an 3550(WS-C3550-24) to prioritize traffic based on cos value. Traffic with cos value 5 or higher should have precedence regardless of interface, vlan och port...
 
You need to enable QoS, trust CoS on your ports, enable egress priority queuing on your ports and map CoS 5 to the priority queue:
Code:
mls qos                     ! enables QoS
!
interface FastEthernet0/1
 mls qos trust cos          ! trusts received CoS values
 priority-queue out         ! enables Q4 to operate as strict priority
 wrr-queue cos-map 4 5      ! maps CoS 5 to Q4
!

I assume you are running Voice VLANs or trunks as CoS will only appear in packets that are tagged. There is a lot more to QoS, however what you asked is answered above.

HTH

Andy
 
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