From: Victor Cappuccio (victor@ccbootcamp.com)
Date: Fri Mar 30 2007 - 06:48:59 ART
Hi,
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t
/122t8/ftwrdecn.htm#52852
mean queue depth, means, that Average queue depth is based on the actual queue
depth on the interface and the exponential weighting is the constant. It is a
moving average. The minimum and maximum thresholds are compared against this
value to determine drop decisions.
The formula used for tracking queue size is:
average = (old_average * (1-1/2^n)) + (current_queue_size * 1/2^n)
http://www.cisco.com/networkers/presentations/qos/1077_038.ppt
http://www.cisco.com/networkers/presentations/qos/1058_038.ppt
http://www.cisco.com/networkers/presentations/qos/1182_048.ppt
thanks,
Victor Cappuccio.-
Network Learning Inc - A Cisco Sponsored Organization (SO) YES! We take
Cisco Learning credits!
victor@ccbootcamp.com
http://www.ccbootcamp.com (Cisco Training and Rental Racks)
http://www.ccbootcamp.com/groupstudy.html (groupstudy member discounts!)
Voice: 702-968-5100
FAX: 702-446-8012
-----Original Message-----
From: nobody@groupstudy.com on behalf of haducbinh
Sent: Fri 3/30/2007 15:37
To: ccielab@groupstudy.com
Subject: WRED
Hi GS!
I configure WRED, but I don't understand the meaning two of this:
exponential weight: 9
mean queue depth: 13
what do "exponential" and "mean queue depth" mean?
R2#sh policy-map interface s0/1
Serial0/1
Service-policy output: TRAFFIC
Class-map: VoIP (match-all)
0 packets, 0 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 60 (%)
Bandwidth 76 (kbps) Burst 1900 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map: PING (match-any)
1845 packets, 2334016 bytes
30 second offered rate 55000 bps, drop rate 0 bps
Match: dscp af21
971 packets, 1229040 bytes
30 second rate 27000 bps
Match: dscp af23
874 packets, 1104976 bytes
30 second rate 28000 bps
Queueing
Output Queue: Conversation 41
Bandwidth 10 (kbps)
(pkts matched/bytes matched) 1533/1865680
(depth/total drops/no-buffer drops) 12/0/0
exponential weight: 9 !<-- here
mean queue depth: 13 !<-- here
dscp Transmitted Random drop Tail drop Minimum Maximum
Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh
prob
af11 0/0 0/0 0/0 32 40
1/10
af12 0/0 0/0 0/0 28 40
1/10
af13 0/0 0/0 0/0 24 40
1/10
af21 975/1234144 0/0 0/0 32 40
1/10
af22 0/0 0/0 0/0 28 40
1/10
af23 874/1104976 0/0 0/0 24 40
1/10
af31 0/0 0/0 0/0 32 40
1/10
af32 0/0 0/0 0/0 28 40
1/10
af33 0/0 0/0 0/0 24 40
1/10
af41 0/0 0/0 0/0 32 40
1/10
af42 0/0 0/0 0/0 28 40
1/10
af43 0/0 0/0 0/0 24 40
1/10
cs1 0/0 0/0 0/0 22 40
1/10
cs2 0/0 0/0 0/0 24 40
1/10
cs3 0/0 0/0 0/0 26 40
1/10
cs4 0/0 0/0 0/0 28 40
1/10
cs5 0/0 0/0 0/0 30 40
1/10
cs6 0/0 0/0 0/0 32 40
1/10
cs7 0/0 0/0 0/0 34 40
1/10
ef 0/0 0/0 0/0 36 40
1/10
rsvp 0/0 0/0 0/0 36 40
1/10
default 0/0 0/0 0/0 20 40
1/10
Thanks!
HaDucBinh
Email: <mailto:haducbinh@vnpro.org> haducbinh@vnpro.org
Y/M: haducbinh
Phone: +84 908 191 322
---------------------------------------------------------------------------
Vietnamese Professionals (VnPro)
Cisco Authorised Training
149/1D Ung Van Khiem St - Ward 25 - Binh Thanh Dist - HCMC
Tel: (08) 5124257 - (08) 5125314 Fax: (08) 5124314
Website: <http://vnpro.vn/> http://vnpro.vn Support Forum:
<http://vnpro.org/> http://vnpro.org
This archive was generated by hypermail 2.1.4 : Sun Apr 01 2007 - 06:35:53 ART