From: aansar@sscomp.com.sg
Date: Tue Oct 29 2002 - 20:41:31 GMT-3
dear ayman
as i understand , RSVP works with in conjunction with interface queue , it
doesnt replace the queue , so rsvp does the reservation but the interface
queue implements it .
it is something like , using RSVP we are modifying opp router (or
routers) interface queueing to honor the reservation done by the rsvp.
normally rsvp works with WFQ , you are free to use any queue (even LLQ
can)
but still i havent got the correct mind set to interpret the lab question
, may be like if the question to reserve the voice bandwidth end to end ,
the only choice is availbale is RSVP.
as traffic shaping and policing , we know the basic difference shaping
smooth the traffic fluctuation (by using queueing) but policing drops the
traffic if it is more than configured , so shaping goes with queue , so
you have choice , normally cisco suggest to use LLQ than CBWFQ for voice
..
but i think if you dont use RSVP , you must modify the queueing all the
way in the intermediate routers till the destination to keep the voice
priority , but if you use RSVP with default WFQ , it is done automatically
, only you have to configure the ip rsvp bandwidth in all intermediators
interfaces
this what i think , i am not confident though .
another thing i remember is if you RSVP , the interface bandwidth
allocated only when request comes , but if you use LLQ or CBWFQ the
bandwidth is taken out (reserved already)
as Deepesh told , it is fine , but we have to repeat this in all the routers along
the way (thats what i am wondering too), but if still question says END -
END i think the only choice is use RSVP .
i request VOIP gurus to help us to get this concept ,, guru's pls help
thanks
aa
Ayman Hamza <ayhamza@cisco.com>
Sent by: nobody@groupstudy.com
30-10-02 06:00 AM
Please respond to Ayman Hamza
To: deepesh@cisco.com
cc: ccielab@groupstudy.com
Subject: RE: CCIE LAB VOICE question, How to reserve bandwidht for voice sessions!!
Hi Deepesh;
Thanks for your reply. But I don't see how you are allocating (reserve)
20kb/s for each session!! CBWFQ/LLQ won't help in this, right? PLS advise!
Ayman
> From nobody@groupstudy.com Tue Oct 29 03:14:10 2002
> From: "Deepesh Chouhan" <deepesh@cisco.com>
> To: "Ayman Hamza" <ayhamza@cisco.com>, <ccielab@groupstudy.com>,
> <ayman_hamza@hotmail.com>
> Subject: RE: CCIE LAB VOICE question, How to reserve bandwidht for voice
> sessions!!
> Date: Mon, 28 Oct 2002 17:49:05 -0800
> MIME-Version: 1.0
> Content-Transfer-Encoding: 7bit
> X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
> X-ASK-Info: Confirmed by user
> Sender: nobody@groupstudy.com
> Reply-To: "Deepesh Chouhan" <deepesh@cisco.com>
>
> Hi
>
> Cisco has fixed the problem. You should be getting emails on your cisco
> account now.
>
> Regd. your question -
>
> Why not use shaping ?
> If I remember correctly from DQOS (deploying QOS on enterprise n/w)
class,
>
> - ingress side set ip prec 5 for all voice traffic
> (on dial peer voip - set ip prec 5)
> - egress side define
> class-map c1
> match ip prec 5
> policy-map p1
> class c1
> shape 40
>
> Shaping will take place even when there is no congestion
>
> thanks
> deepesh
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Ayman Hamza
> > Sent: Monday, October 28, 2002 5:16 PM
> > To: ccielab@groupstudy.com; ayman_hamza@hotmail.com
> > Cc: ayhamza@cisco.com
> > Subject: CCIE LAB VOICE question, How to reserve bandwidht for voice
> > sessions!!
> >
> >
> > Hi Team;
> >
> > *** PLS reply to me via my hotmail address: ayman_hamza@hotmail.com ,
> > as our cisco mail server has a problem for receiving mails from
> > ccielab@groupstudy.com ****
> >
> >
> > You have hub router - terminating two DLCIs under its subinterface -.
One
> > of these DLCIs are connected to another router that have Tel sets
> > connected
> > to it - the other spoke doesn't have any tel. sets - . So one
> > DLCI will carry the voice traffic.
> >
> > The wording of the question is :
> >
> > All the voice traffic through frame relay interface of R6 - R6 is
> > the hub router - should guarantee a bandwidth of 40kb/s . Each
> > voice session
> > should have 20kb/s .
> >
> > Hint: the command " ip rsvp .." is not enabled - or configurable -
> > with teh IOS image used .
> >
> > My asnwer, and PLS correct me if I'm wrong :
> >
> > !
> > interface serial 0/0
> > frame-relay traffic-shapping
> > !
> > interface Serial0/0.1 multipoint
> > frame-relay interface-dlci 406
> > class ccie
> > !
> > map-class frame-relay ccie
> > frame-relay voice bandwidth 40
> > frame relay ip rtp priority 16384 16383 20
> > !
> >
> >
> > I don't think LLQ is a solution as LLQ takes affect only when there is
> > a congestion. Ofcourse CBWFQ is not a solution because it's not
> > giving any prioritization for any specific traffic like LLQ which
places
> > a specific traffic in Priority queue.
> >
> > PLS advice!
> >
> > Regards;
> > Ayman
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