From: Ruhann (groupstudy@ru.co.za)
Date: Tue Mar 31 2009 - 16:42:21 ART
Hi peoples
I would like to double check something I dont agree with.
The question states as follow:
Congestion Avoidance:
- Configure R6 to randomly drop packets before congestion occurs on the
Serial interface output queue.
- Ensure that traffic marked with critical precedence will not be dropped
unless there are 50 packets in the output queue.
- If there are 70 critical packets in the output queue, R6 should
randomly drop 4 out of every 16 of these packets.
- In the case that there are more than 70 critical packets in the output
queue, they should all be dropped.
- Do not use any MQC commands to accomplish this task.
My solution to this was as follow:
interface Serial0/0
random-detect
random-detect precedence 5 50 70 4
My question is about the MPD value to be worked out here.
How I understand this, to work out your MPD value you take 1/MPD to see the
initial stage of RED,
in this example 4/16 = 1/4 , so the MPD=4
thus 1 in every 4 packets will be randomly dropped when RED kick in (Q=51).
As the Q depth increases so will the random drops, up until Q=70 where 4/4
will be dropped?
Am I understanding this right, Cause the answer to this question was the MPD
=8
ie : random-detect precedence 5 50 70 8
Please share you though and point me right if im wrong. :)
-- <ruhann>Blogs and organic groups at http://www.ccie.net
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