From: Brennan_Murphy@NAI.com
Date: Tue Sep 10 2002 - 11:33:56 GMT-3
I am having trouble understanding when/why CBWFQ drops packets.
I've got 5054 packet drops on a PVC but they started incrementing
even when the 5 minute offered rate was well below the shape
adaptive command. See config below.
More info:
This is on a 7505, CBWFQ, IP CEF Disti is on. Frame relay links
Any insights are appreciated.
class-map match-all gold
match ip precedence 2
!
!
policy-map CBWFQ
class gold
bandwidth percent 30
fair-queue
policy-map 256CIR
class class-default
shape average 768000 3072 3072
shape adaptive 384000
service-policy CBWFQ
rt1#sh pol int hss0/0/0.3
Hssi0/0/0.3: DLCI 320 -
Service-policy output: 256CIR (1231)
Class-map: class-default (match-any) (1251/0)
124803 packets, 109774228 bytes
5 minute offered rate 417000 bps, drop rate 0 bps
Match: any (1255)
queue size 0, queue limit 17
packets output 134504, packet drops 5054
tail/random drops 5054, no buffer drops 0, other drops 0
Shape: cir 768000, Bc 3072, Be 3072
lower bound cir 384000, adapt to fecn 0
output bytes 82134895, shape rate 437000 bps
Service-policy : CBWFQ (1233)
Class-map: gold (match-all) (1235/2)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip precedence 2 (1239)
queue size 0, queue limit 5
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Bandwidth: 30%, kbps 230
Fair-queue: per-flow queue limit 2
Class-map: class-default (match-any) (1245/0)
124803 packets, 109774228 bytes
5 minute offered rate 417000 bps, drop rate 0 bps
Match: any (1249)
queue size 0, queue limit 11
packets output 134504, packet drops 5054
tail/random drops 5054, no buffer drops 0, other drops 0
-BM
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