[c-nsp] VoIP QoS Policy

[r.sahney]

Hi Brian,

           In this case u might face into a little problem , priority
percent is strict queuing, hence if by any chance the traffic will be
more it will be dropped,
it is true that priority has LLQ, Manages Jitter, Improves App.
perfomance, but at the same time drops extra traffic as well,so it
would be wise if u r sure that your voip rtcp will never exceecd 20 %
of the total bandwidth link.

regards
raj.


On Thu, 17 Feb 2005 10:09:16 -0600, Brian Feeny <signal at shreve.net> wrote:
> 
> fyi, I meant for the output policy to have "priority percent" not
> "bandwidth percent" that was a typo.
> 
> Brian
> 
> 
> On Feb 17, 2005, at 9:19 AM, Brian Feeny wrote:
> 
> >
> > I am making a basic QoS policy to install on some of our routers here,
> > to give some QoS to VoIP.
> > Eventually I will come up with a more thorough QoS plan but for now it
> > just needs to take care of
> > VoIP.  The VoIP is using SIP not skinny.  Any comments on the below
> > policy, or anything I may be
> > leaving out?  My goal is to identify VoIP traffic, mark the voice as
> > EF, and the control stuff as AF31,
> > then look at anything else that was marked (by endusers) as EF/CS3/AF31
> > and remark it to 0.
> >
> > Also, does using the NBAR stuff such as "match protocol rtp audio"
> > accomplish the same thing
> > as "match ip rtp 16384 16383"?
> >
> > Brian
> >
> >
> > class-map match-all QoS-VoIP-Control
> >    match access-group name SIP-Control
> > class-map match-all QoS-VoIP-RTCP
> >    match ip rtp 16384 16383
> > class-map match-any QoS-VoIP-Remark
> >    match ip dscp ef
> >    match ip dscp cs3
> >    match ip dscp af31
> > !
> > ip access-list extended SIP-Control
> >   permit udp any any eq 5060
> > !
> > !!! Input Policy
> > !
> > policy-map Mark-DSCP
> >    class QoS-VoIP-RTCP
> >     set ip dscp ef
> >    class QoS-VoIP-Control
> >     set ip dscp af31
> >    class QoS-VoIP-Remark
> >     set ip dscp default
> > !
> > !!! Output Policy
> > !
> > policy-map QoS-Policy
> >    class QoS-VoIP-RTCP
> >      bandwidth percent 20
> >    class QoS-VoIP-Control
> >     bandwidth percent 5
> >    class class-default
> >     fair-queue
> >       set ip dscp default
> >
> >
> >
> >
> > ---------------------------------------------
> > Brian Feeny, CCIE #8036, CISSP
> > Network Engineer
> > ShreveNet Inc.
> >
> > _______________________________________________
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> > https://puck.nether.net/mailman/listinfo/cisco-nsp
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> >
> ------------------------------------------------------------------------
> ------
> Brian Feeny, CCIE #8036, CISSP          e: signal at shreve.net
> Network Engineer                                p: 318.213.4709
> ShreveNet Inc.                                  f: 318.221.6612
> 
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