From: Brennan_Murphy@NAI.com
Date: Thu Mar 18 2004 - 15:55:07 GMT-3
The packets are dropped when the class is full and there is no
unallocated bw available...ie, congestion.
When all classes are full, they share the remaining bandwidth in
proportion to the percentage
of traffic protected by the bandwidth percent statement. So in this
case, I have a class with 1% protected....when it competes with other
classes, such as the Gold class of 25%, it gets 1 byte for every 25 gold
bytes.
This ratio can be overridden using "bandwidth remaining percent" . So
for example, I can
set it up so my platinum class gets 80% of remaining bw...other classes
get whatever else I config.
Does this sound right?
Thanks,
BM
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Murphy, Brennan
Sent: Thursday, March 18, 2004 10:50 AM
To: ccielab@groupstudy.com
Subject: CBWFQ over ATM: Questions on Show policy interface output
I need help understanding the output from a show policy interface atm
command below. This is coming from a 7500 series router running
12.2.16a. Trying to understand under what circumstances packet drops
occur in the classes. Are packets dropped when the banwidth percent for
a class is exceeded or when the total banwidth available on the ATM VC
is exceeded. The output on this command seems to suggest that when the
bw percent chosen for the class is exceeded, packets are dropped.
pladcrt1#sh pol int atm10/0/0.12
ATM10/0/0.12: VC 2/212 -
Service-policy output: CBWFQQ
queue stats for all priority classes:
queue size 0, queue limit 57
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Class-map: CONTROL (match-all)
13482 packets, 986994 bytes
5 minute offered rate 5000 bps, drop rate 0 bps
Match: ip dscp cs6
queue size 0, queue limit 1
packets output 13482, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Bandwidth: 5.0%, kbps 38
Class-map: VOICE (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef
Priority: 30% (230 kbps), burst bytes 5750, b/w exceed drops: 0
Class-map: VIDEO (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp cs4
queue size 0, queue limit 1
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Bandwidth: 1.0%, kbps 7
Class-map: PLATINUM (match-all)
651 packets, 444300 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp cs3
queue size 0, queue limit 1
packets output 600, packet drops 51
tail/random drops 51, no buffer drops 0, other drops 0
Bandwidth: 1.0%, kbps 7
Class-map: GOLD (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp cs2
queue size 0, queue limit 47
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Bandwidth: 25.0%, kbps 192
Class-map: SILVER (match-all)
1116 packets, 118934 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp cs1
queue size 0, queue limit 1
packets output 1096, packet drops 20
tail/random drops 20, no buffer drops 0, other drops 0
Bandwidth: 5.0%, kbps 38
Class-map: BRONZE (match-all)
466036 packets, 165312557 bytes
5 minute offered rate 170000 bps, drop rate 0 bps
Match: ip dscp default
queue size 0, queue limit 1
packets output 459726, packet drops 6315
tail/random drops 6315, no buffer drops 0, other drops 0
Bandwidth: 1.0%, kbps 7
Class-map: DEFAULT (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps
Match: ip dscp default
Class-map: class-default (match-any)
1729 packets, 792398 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
queue size 0, queue limit 7
packets output 1700, packet drops 29
tail/random drops 29, no buffer drops 0, other drops 0
Thanks,
BM
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