[c-nsp] VoIP QoS on Cisco Routers

[Rodney Dunn]

That configuration should work to have an LLQ class of
1544 matching the asterisktraffic ACL.

The problem most likely if there is one is with the
backpressure coming from an ethernet interface signalling
congestion to the policy. Monitor 'sh policy-map interface e0'
and see what you get.

You might need to try a HQOS configuration with a parent shaper
and the child policy doing the queueing so the shaping (parent)
policy kicks in for backpressure.

Rodney

On Wed, Sep 28, 2005 at 05:53:38PM -0500, Jeremiah Millay wrote:
> I've set up QoS on our office router for use with cisco 7960 phones. The 
> phones connect to an external server. I guess I'd like to post my 
> configs and get some feedback as to if I am doing QoS the right way. 
> I've tried two variations of QoS. Not sure which is the most effective. 
> Sometimes it seems as though it might not be working.
> We are using the SIP protocol for call set up (UDP port 5060) and all of 
> our voice RTP streams have been modified to use ports UDP 10000 through 
> 20000. I'm applying to the outbound interface on our router.
> Here is my config:
> 
> ip access-list extended asterisktraffic
>  remark RTP Streams
>  permit udp any any range 10000 20000
>  remark SIP Traffic
>  permit udp any any eq 5060
> 
> !
> class-map match-any VoIP
>   match access-group name asterisktraffic
> !
> 
> policy-map lowlatency
>   class VoIP
>    priority 1544
>   class class-default
>    fair-queue
> !
> 
> interface Ethernet0
>  description public
>  ip address X.X.X.X X.X.X.X
>  full-duplex
>  service-policy output lowlatency
>  no cdp enable
> !
> 
> 
> 
> 
> I've also tried working with this config:
> 
> 
> 
> access-list 105 permit udp any any range 10000 20000
> access-list 105 permit udp any any eq 5060
> access-list 106 permit tcp any any eq telnet
> access-list 106 permit tcp any any eq 22
> !
> priority-list 1 protocol ip high list 105
> priority-list 1 protocol ip medium list 106
> !
> !
> interface Ethernet0
>  description public
>  ip address X.X.X.X X.X.X.X
>  full-duplex
>  priority-group 1
>  no cdp enable
> !
> 
> Any feed back is appreciated.
> Jeremiah
> 
> -- 
> Rock River Internet                            Jeremiah Millay
> 202 W. State St, 8th Floor              jeremiah at rockriver.net
> Rockford, IL 61101                      815-968-9888 Ext. 2202
> USA                                               fax 968-6888
> 
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