I have an IP voice switch connected to my Catalyst 3524 Switch. How do I prioritize traffic from my voice switch which travels on UDP Port 5004. The Catalyst 3524 is also connected to a 2621 router, How do I prioritize the voice traffic on the router?
3524 is layer 2 switch and hence it won't be able to look at Layer 3 ip precedence/ DSCP bits.
It does look at layer 2 COS values. The port by default trusts the incoming COS value.
You can configure per-port prioritization with the "switchport priority default <0-7> ". This will prioritize the traffic on this port which is not tagged with COS value. You won't able to define ACLs to match only that UDP port traffic though.
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This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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