From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Sun Aug 27 2006 - 02:31:46 ART
Exellent link, Victor.
I just wanted to say a few words here. RSVP is a nice protocol, that does
a lot of things at the same time: Admission Control, Classification,
Policing,
Scheduling - almost the complete QoS portfolio. In Cisco's implementation
it was always bound to WFQ as queueing mechanism, where RSVP claims
some "low-weight" flows for it's reservations.
Clearly it means that we need to use WFQ as queueing strategy to RSVP
enable interfaces. With FR we should use WFQ as per-VC queueing, and
hence we need to enable some kind of FRTS to enforce per-VC queue. Also,
you need to reserve bandwith on physical interface, as well as on
subinterfaces.
The only problem with RSVP is that it's not very scalable. So Cisco moved
forth and decoupled some of RSVP functions. First, they introduce RSVP
support for LLQ. Primary idea was that "voice-like" flows (which is a
configurable
classificaion factor, based on flow behavior) should go to PQ/LLQ:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t3/rsvp_llq.htm
Next, they introduce RSVP scalability enhancements, which left RSVP only the
admission control role:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/rsvpscal.htm
With this new feature one may totatlly remove RSVP from
classification/scheduling
stages, yet enjoy it's admission control features.
Hope that was'nt too boring :)
2006/8/27, Victor Cappuccio <cvictor@protokolgroup.com>:
>
> Hi James, I not one of the above mentioned, IMHO is not very polite to put
> only Gurus on the Subject to respond.
>
> Anyways I Think this link should help
>
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
> _c/fqcprt5/qcfrsvfr.htm#wp1011918
>
>
> Saludos,
> Victor.-
>
>
> -----Mensaje original-----
> De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> James
> Nendel
> Enviado el: Domingo, 27 de Agosto de 2006 12:33 a.m.
> Para: Cisco certification
> Asunto: RTP & RSVP ----THE BRIANS / PETR AND SCOTT
>
> How can i configure the RSVP for RTP-packet and give priority to RTP
> flows?
>
>
> R1-(S0)----FR(DLCI 102 201)---(S0)--R2
> FR(DLCI 103 302)---(S0)--R3
>
>
> On R1's S0 , Configure RSVP for Dlci 102, the Total reservation for RTP is
> 600kbps and the maximum bandwidth for every Single-flow-kbps is 40Kbps,
> Also
> how I can do RTP Low Latency?
>
> Please help
> thank!
> James
>
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-- Petr Lapukhov, CCIE #16379 petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344
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