[c-nsp] QoS for VoIP basics

[Collins, Richard]

I really haven't done any VoIP but wouldn't you be looking for "strict
priority
scheduling"?  That (expedite queue) would be enabled on the egress port
of the 2950.

Example:
Switch#sh mls qos interface fastEthernet 0/3 queueing 
FastEthernet0/3
Egress expedite queue: ena
wrr bandwidth weights:
qid-weights
 1 - 100
 2 - 1
 3 - 1
 4 - 1    when expedite queue is disabled
Cos-queue map:
cos-qid
 0 - 1
 1 - 1
 2 - 1
 3 - 1
 4 - 1
 5 - 4
 6 - 1
 7 - 1

Switch#sh running-config int fastEthernet 0/3
Building configuration...

Current configuration : 251 bytes
!
interface FastEthernet0/3
 switchport access vlan 305
 wrr-queue bandwidth 100 1 1 1
 wrr-queue cos-map 1 0 1 2 3 4 6 7
 wrr-queue cos-map 4 5
 priority-queue out

>Here are my configs:
>
>====
>2950
>====
>
>wrr-queue bandwidth 100 1 1 0
>wrr-queue cos-map 1 0 1 2 3 4 6 7
>wrr-queue cos-map 4 5
>!
>class-map match-all VoIP
>  match access-group 100
>!
>!
>policy-map All_Phone_Traffic_46
>  class VoIP
>    set ip dscp 46
>!
>access-list 100 permit ip any any
>
>PLUS the ports into which VoIP A and B plug are configured with
>"service-policy input All_Phone_Traffic_46"