From: Michael Wong (Michael.Wong@xxxxxxxxxx)
Date: Tue Aug 28 2001 - 07:45:41 GMT-3
Check with your provider on how they act upon pre-marked DE frames. I Australia
we have providers that do not count pre-marked DE frames towards CIR.
For instance, we have a PVC with both voice and data. Flag all data as DE using
"de-list" and it will never count towards CIR. Therefore your voice (as long a
s you use call admission control to make sure the voice trunks don't exceed the
CIR) will never be flagged as DE because it's never exceeding CIR. If there is
congestion, the provider will drop the DE marked data frames only .... not the
voice.
Voice should never be allowed to burst above CIR !!!! ..... make sure you contr
ol voice access at the edge.
Hope this helps ..... MW
-----Original Message-----
From: jonatale@earthlink.net [mailto:jonatale@earthlink.net]
Sent: Tuesday, 28 August 2001 3:53 pm
To: Ron Royston
Cc: jpark@wams.com; ccielab@groupstudy.com
Subject: Re: CIR on Frame-relay
I think the router would need to be config'd to do that ("de-list"?), wouldn't
it?
comments???
Ron Royston wrote:
> The frames in excess of the CIR get flagged for "discard eligible" and may
> or may not make it through the providers network depending on network load.
> If the frames are discarded, a higher layer transport function will
> recognize this and may request a retransmission. In the case of voice, a
> retransmission will not occur.
>
> Use traffic shaping as a prevention measure to "DE" flagged frames, either
> generic of frame-relay specific. GTS will constrain all or a subset of an
> interfaces traffic to a particular bit rate and queue the bursts for
> transmission. FRTS does the same and can dynamically throttle back the bit
> rate based on the presence of congestion in the FR network.
>
> Additionaly, if you want to prioritize voice over other types of traffic,
> you can do that too.
>
> Ronnie Royston, CCIE#6824
> Avnet Enterprise Solutions Division
> (713)305-6615 cell
>
> >From: Jeongwoo Park <jpark@wams.com>
> >Reply-To: Jeongwoo Park <jpark@wams.com>
> >To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
> >Subject: CIR on Frame-relay
> >Date: Sun, 26 Aug 2001 13:47:50 -0700
> >
> >Hi all
> >Quick question for you guys.
> >What happens if data transfer rate in frame relay exceed CIR?
> >Would there be a delay or retransmission?
> >
> >What if Voice transfer rate in Frame relay exceed CIR?
> >
> >Thanks in adv.
> >
> >JP
> >**Please read:http://www.groupstudy.com/list/posting.html
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