From: Alexander Arsenyev (GU/ETL) (alexander.arsenyev@ericsson.com)
Date: Sun Mar 20 2005 - 06:14:47 GMT-3
Frame Relay Traffic Policing sets DE bit on all traffic above Bc:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/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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