From: Huan Pham (huan.pham@valuenet.com.au)
Date: Tue May 06 2008 - 03:15:27 ART
Hi Dwayne,
This 70% is the reserved bandwidth for the default. If you do not have any
other classes configured, that number (70%) means nothing, I believe.
Depending on the type of traffic, if it is not bursty you may not experience
any congestion even if the link utilization is above 70%.
When there is congestion, and the queue length is between min & max
threshold, packets in the queue may be
- remarked with ECN bits of 11 (if the endpoints support ECN)
- dropped (if the endpoints do not support ECN)
- transmitted untouched
Remember WRED is a statistics process, so the more congested the link is,
the more you see packets get remarked or dropped. But even if the link is
very congested, you still see packets transmitted untouched.
I think the DOC CD link you gave explains this quite clearly.
Regards,
Huan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Athaide, Dwayne
Sent: Tuesday, 6 May 2008 1:49 PM
To: 'groupstudy'
Subject: Random detect ECN
Hi
I got this off Cisco website and need clarification.
Enabling ECN Example
The following example enables ECN in the policy map called pol1:
Router(config)# policy-map pol1
Router(config-pmap)# class class-default
Router(config-pmap)# bandwidth per 70
Router(config-pmap-c)# random-detect
Router(config-pmap-c)# random-detect ecn
Would this mean that if the bandwidth exceeds 70% the ECN bit is set
signaling
congestion to the the downstream device.
Thanks
http://www.cisco.com/en/US/docs/ios/12_4/qos/configuration/guide/hwrdecn.htm
l
#wp1025594
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