From: Allan Wells (wellse@bigpond.net.au)
Date: Sun Apr 18 2004 - 11:22:42 GMT-3
Hi,
With The ip rtp priority command it only uses udp ports 16384 -->32767 for
strict queueing thats it end of story.
As apposed to policy where you can get much more granular on what type of
traffic goes into the priority queue.
In the policy example you have used you are only placing udp traffic in the
port range specified 16384 -->32767 into the Priority queue by matching
the same ports as ip rtp priority uses.
Note you can use both features together but Ip rtp priorty takes precedence.
Ip rtp priority was generally used before the Modular QoS command line
interface came to fruition .
These days LLQ is the done thing because you can be more specific and not
just open up these ports.
Check out this link
http://cisco.com/en/US/netsol/ns339/ns392/ns399/ns404/networking_solutions_w
hite_paper0900aecd800dd974.shtml
regards
Allan
----- Original Message -----
From: <alsontra@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, April 18, 2004 9:58 AM
Subject: LLQ vs. IP RTP PRIORITY , when do you use which?
> Group,
>
> I've seen "ip rtp priority" and service policy's attached to frame-relay
> map-class's for the purposes of providing low latency for voice traffic.
> however, I am unable to differentiate between the two methods of queuing.
I
> understand the individual syntax and meanings, but unfortunate do not find
any
> real difference. To that end, I can't effectively chose between them.
Aside
> from the fact that the second example allows for more flexibility, in that
its
> using CBWFQ, where's the difference? Which to use and when?
>
>
> map-class frame-relay voip
> frame-relay cir 256000
> frame-relay bc 2560
> frame-relay mincir 256000
> frame-relay ip rtp priority 16384 32767 64
>
> VS.
>
> class-map voice
> match access-group 101
>
> access-list 101 permit udp any any range 16384 32767
>
> policy-map mypolicy
> class voice
> priority 64
>
> map-class frame-relay voip
> frame-relay cir 256000
> frame-relay bc 2560
> frame-relay mincir 256000
> service-policy output mypolicy
>
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