VOIP QoS sample

1. Configure class map

Cisco-QoS#conf t
Cisco-QoS(config)#class-map EF
Cisco-QoS(config-cmap)#match ip precedence 5
 

Cisco-QoS#sh class-map EF
 Class Map match-any EF (id 1)
   Match ip  precedence 5       

Cisco-QoS#sh class-map class-default
 Class Map match-any class-default (id 0)
   Match any 

 

2. Configure policy map

Cisco-QoS#conf t
Cisco-QoS(config)#policy-map voip
Cisco-QoS(config-pmap)#priority percent 90
Cisco-QoS(config-pmap)#police cir percent 90 bc 25 ms be 25 ms
Cisco-QoS(config-pmap-c-police)#conform-action transmit
Cisco-QoS(config-pmap-c-police)#exceed-action drop

Cisco-QoS(config-pmap-c-police)#class class-default
Cisco-QoS(config-pmap-c)#random-detect
Cisco-QoS(config-pmap-c)#random-detect precedence 0 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 1 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 2 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 3 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 4 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 5 19 64 1
Cisco-QoS(config-pmap-c)#random-detect precedence 6 64 70 1
Cisco-QoS(config-pmap-c)#random-detect precedence 7 64 70 1
 

 
Cisco-QoS#sh policy-map voip
  Policy Map voip
    Class EF
     police cir percent 90 bc 25 ms be 25 ms
       conform-action transmit
       exceed-action drop
      Strict Priority
      Bandwidth 90 (%)
    Class class-default
      Bandwidth 10 (%)
            exponential weight 9
            class    min-threshold    max-threshold    mark-probablity
            ———————————————————-

            0          19                 64               1/1
            1          19                 64               1/1
            2          19                 64               1/1
            3          19                 64               1/1
            4          19                 64               1/1
            5          19                 64               1/1
            6          64                 70               1/1
            7          64                 70               1/1
            rsvp       –                  –                1/10
                   
                                    

 

3. Apply service policy to interface

 

Cisco-QoS#conf t
Cisco-QoS(config)#interface serial1/1
Cisco-QoS(config-if)#service-policy output voip