From: Alexander Arsenyev (GU/ETL) (alexander.arsenyev@ericsson.com)
Date: Sun Mar 20 2005 - 09:47:20 GMT-3
Was the original question specifically stating where the congestion is experienced: on the sending router
or in the FR network? Was there another task/question which asked to configure FRTS?
If both answers are NO then I have to use lateral thinking:
-you can actually create permanent state of congestion on the router interface by configuring "hold-queue 1 out" on the interface. This means that every single IP packet will completely fill the output queue and this is classic definition of congestion :-}
-when you are done with the above just configure "frame-relay de-list" matching on IP traffic and attach it to the interface.
-the down side is that there will be packet drops :-[ but I guess that original question says there is nothing about drops prevention.
HTH,
Cheers
Alex
-----Original Message-----
From: Oliver Grenham [mailto:ogrenham@optusnet.com.au]
Sent: 20 March 2005 13:25
To: Alexander Arsenyev (GU/ETL)
Subject: Re: QOS question
Hi Alex,
I understand that FRTS may be used to set DE bits but this particular
question did not ask to configure FRTS nor did it give any values foe
provisioned rates etc? I found it a difficult little question and one which
I still have not definitively solved.
Ollie.
----- Original Message -----
From: "Alexander Arsenyev (GU/ETL)" <alexander.arsenyev@ericsson.com>
To: "'Oliver Grenham'" <ogrenham@optusnet.com.au>; <ccielab@groupstudy.com>
Sent: Sunday, March 20, 2005 4:14 PM
Subject: RE: QOS question
> Frame Relay Traffic Policing sets DE bit on all traffic above Bc:
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120
limit/120s/120s17/frtp_gsr.htm
>
> <quote>
> The following actions are taken, on a per-packet, per switched PVC basis,
by Frame Relay Traffic Policing:
>
>
> --------------------------------------------------------------------------
------
>
> Step 1 If the Discard Eligible (DE) bit is set in the packet when it
arrives, the packet is automatically treated
> as excess: the Bc test in Step 2 is skipped and the packet proceeds to
Step 3.
>
> Step 2 If the DE bit is not set when the packet arrives, and the byte
count in the packet is within Bc for the past Tc,
> then the packet is allowed through. If the packet is not within Bc for the
past Tc, the packet proceeds to Step 3.
>
> Step 3 If the number of bytes in the packet falls within Be+Bc for the
past Tc, the DE bit in the header is set
> (if it is not already set) and the packet is allowed through. If the
packet does not fall within Be+Bc for the past Tc,
> the packet is dropped.
>
> </quote>
>
> HTH,
> Cheers
> Alex
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
> Sent: 20 March 2005 03:07
> To: ccielab@groupstudy.com
> Subject: QOS question
>
>
> If for instance a question asks you to configure a router so that it sets
the
> Frame relay DE bit for IP traffic when and only when there is congestion,
how
> would one approach this question? I know you could use a frame relay DE
> list/Group but this would always set the DE bit for all packets classified
in
> the list.
>
> Any ideas would be greatly appreciated.
>
> Ollie.
>
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