From: Alec (clapun@graduate.hku.hk)
Date: Sun Dec 21 2003 - 14:28:34 GMT-3
Hi group,
1) The Bc & Be calculation is different between CAR and shaping ??
In CAR, setting Be=Bc effectively disables excess burst size whereas in
Shaping, Be=Bc will NOT disable Be but will assign a burst size = Bc. Am I
correct ?
2) what's the difference between shape [average | peak] ? The command
reference doesn't explain clearly.
3) What's the purpose of using both bandwidth and shaping in the policy-map
simutaneously ? As far as I know, both bandwidth and shaping are talking
about egress queueing. Isn't that when we apply shaping to certain BW, that
BW is already reserved in the egress queue. The following example seems to
imply the shaping value always greater than the bandwidth value. Any input
is welcome!
The following example is copied from the configuration guide :
Router(config)# policy-map shape-cbwfq
Router(config-pmap)# class cust1
Router(config-pmap-c)# shape average 384000
Router(config-pmap-c)# bandwidth 256
Router(config-pmap)# class cust2
Router(config-pmap-c)# shape peak 512000
Router(config-pmap-c)# bandwidth 384
Router(config-pmap-c)# configure terminal
Router(config)# interface Serial 3/3
Router(config-if)# service out shape-cbwfq
thanks
alec
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