QoS for Voice issue

Unanswered Question
Sep 15th, 2009

hi,

wich of the 2 policy map can i use for the best practice QoS Voice? and why?

Example 1:

ip access-list extended Voice

permit udp any any range 16384 37276

ip access-list extended Voice-Signaling

permit udp any eq 1718 any

permit udp any any eq 1718

permit udp any eq 1719 any

permit udp any any eq 1719

permit tcp any eq 1720 any

permit tcp any any eq 1720

Class Map:

class-map match-any Voice-Signaling

match access-group name Voice-Signaling

match ip dscp 24

class-map match-any Voice

match access-group name Voice

match ip dscp 46

Example 2:

ip access-list extended VOICE

permit udp any eq 1718 any

permit udp any any eq 1718

permit udp any eq 1719 any

permit udp any any eq 1719

permit tcp any eq 1720 any

permit tcp any any eq 1720

permit udp any any range 16384 37276

!

class-map match-all GOLD

match access-group name VOICE

I have this problem too.
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Nicholas Matthews Tue, 09/15/2009 - 21:31

The difference between the two is whether or not you would like to give different treatment between your media and signaling.

All the design guides you will read will tell you to do something similar to LLQ for voice. Priority queue the media, and give a certain percentage of bandwidth to the signaling.

In all practicality, if you give priority to both you probably won't notice any difference since the signaling is a relatively low value compared to the media anyways.

Ex 1: correct

Ex 2: will work, but not as correct

-nick

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