From: Nguyen Hoang Long (ng-hlong@hn.vnn.vn)
Date: Sun May 11 2003 - 08:39:13 GMT-3
Hi group,
I hv question about <cir> value when config Class-based shaping with 'peak'
option, the command is
assume that the Peak rate shaping is 512kbps, in all document i found that the
config is:
class-map match-all voice
match ip precedence 5
!
!
policy-map QOS
class voice
shape peak 512000 <-------------- this value is used in all document
But when I do verifying:
R2#sh policy-map int f 0/0
FastEthernet0/0
Service-policy output: QOS (1071)
Class-map: voice (match-all) (1073/2)
16 packets, 5824 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip precedence 5 (1077)
Traffic Shaping
Target Byte Sustain Excess Interval Increment Adapt
Rate Limit bits/int bits/int (ms) (bytes) Active
1024000 3200 12800 12800 25 3200 -
<------------ target Rate now is 1024000, 2 times the configured value.
I know that when be is not specified, be=bc, so peak rate = 2 x CIR
Therefore, to achieve peak rate of 512kbps, the config should be: "shape peak
256000". (not "shape peak 512000" as said in Document)
Can someone pls. help, which value should I use in the Lab if i'm asked to do
as above.
Thanks,
Long.
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