From: Koen Zeilstra (koen@koenzeilstra.com)
Date: Fri Jun 09 2006 - 04:23:19 ART
I get the LLQ part in RSVP, however how to get voice packets into the LLQ?
For example: suppose I want reserve max 400k of bandwidth and use 40k for
each voice call. How do I make sure only voice pakkets gets LLQ-ed?
regards,
Koen
-----------------------
Rules:
(1) The boss is always right.
(2) When the boss is wrong, refer to rule 1.
On Fri, 9 Jun 2006, Koen Zeilstra wrote:
| What about this?
|
| http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_white_paper09186a0080080204.shtml
|
|
|
| -----------------------
| "Here at the Phone Company, we serve all kinds of people; from
| Presidents and Kings to the scum of the earth ..."
|
| On Wed, 10 May 2006, Petr Lapukhov wrote:
|
| | Excellent, topic here!
| |
| | Now, the only thing i could quickly find on DocCD for RSVP/LLQ is
| |
| | http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_white_paper09
| | 186a0080080204.shtml
| |
| | It has one excellent picture, that cleared my thoughts a little.
| |
| | This is how i get it:
| |
| | First of all, RSVP is not just a signalling mechanism. It also has idead of
| | classification, based on concept of flow.
| |
| | Next, RSVP was originally implemented to work with WFQ (reserved flows) -
| | due to it's flow-based nature. RSVP defines a set of reserved queues within
| | WFQ, that have lower weights than other flows.Note that this is not
| | a strict priority queueing, so RSVP is not always served first.
| |
| | Then a concept of strict priority was introduced into WFQ - IP RTP priority.
| | Now, what should we do, when a voice flow is classified to be under RSVP
| | reservation? Cisco introduced a concept of "ip rsvp pq-profile", that could
| | direct some of RSVP flows into PQ.**
| |
| | Finally, PQ+WFQ mutated to LLQ/CBWFQ, as we know it by now.
| | But still, this concept is based on original PQ+WFQ idea. So I think
| | RSVP would work great with modern LLQ as well.
| |
| | This is what you can see on a picture - after all classifications been done,
| | we have one priority queue per interface (this is where RTP priority and
| | class priority are merged). Still RSVP could direct some of it's flows into
| | this queue.
| |
| | But as I get it, this priority queue "reserved bandwidth" is based on
| | LLQ/RTP
| | Priority configuration. RSVP bandwidth is bandwidth (weigth) defined for
| | reserved
| | flows within WFQ.
| |
| | I'll try to verify RSVP with modern LLQ in my lab as soon as possible, since
| | i'm interested in results too :)
| |
| | HTH
| | Petr
| |
| | 2006/5/10, James Ventre <messageboard@ventrefamily.com>:
| | >
| | > Thought you might find this interesting
| | >
| | > By: Pete Welcher
| | > http://www.netcraftsmen.net/welcher/papers/smorgasbord01.html
| | >
| | >
| | > "I recently did some work that lead to heavily reviewing the (sparse)
| | > Cisco RSVP documentation. The documentation really doesn't say much
| | > about how RSVP actually works in the Cisco routers. In particular, the
| | > documentation does say RSVP works with weights with WFQ. Fine, I believe
| | > that, and I know enough about that to believe it probably does what is
| | > needed. Does RSVP also do that with CBWFQ/MQC? Not documented, as far as
| | > I could see. The RSVP LLQ feature is mis-titled, it is really Priority
| | > Queueing with WFQ, a far different thing. Etc. I ended up with the
| | > feeling that the only thing Cisco RSVP seemed guaranteed to work with
| | > was WFQ. "
| | >
| | >
| | > James
| | >
| | >
| | >
| | > Jian Gu wrote:
| | > > Hi, could any one please give me a pointer which explains how RSVP is
| | > > configured to work with LLQ for voice traffic? my understanding is that
| | > RSVP
| | > > is just a signalling protocol, it still depends individual router's LLQ
| | > > implementation to guarantee bandwidth for voice, but if LLQ is
| | > configured
| | > > for voice traffic in every router, why do we need RSVP at all for voice?
| | > >
| | > > Jian
| | > >
| | > > _______________________________________________________________________
| | > > Subscription information may be found at:
| | > > http://www.groupstudy.com/list/CCIELab.html
| | >
| | > _______________________________________________________________________
| | > Subscription information may be found at:
| | > http://www.groupstudy.com/list/CCIELab.html
| |
| | _______________________________________________________________________
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| |
|
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