service policy output problem?

Question

Hello,I have a problem when I try to apply service policy to an interface thiserror is shown: I/f Serial0/2 class class-default requested bandwidth 922 (kbps) Availableonly 666 (kbps)my policy map is as follows:policy-map outputclass ADSLbandwidth 102random-detectclass class-defaultbandwidth 922random-detectThe only way it works is if I specify bandwidth for class ADSL as 100 andspecify 666 for class class-default. It seems for some reason the routerthinks it only has 768kbps bandwidht but it is a 1024kbps link...Any ideas / thoughts would be appreciated ;-)

prashant.goud · Answer

Pbbly you are using one the newer version of IOS ( 12.2 upwards). Withnew IOSs, Cisco says, "the sum of all bandwidth allocation on aninterface cannot exceed 75 percent of the total available interfacebandwidth. The remaining 25 percent is used for other overhead,including Layer 2 overhead, routing traffic, and best-effort traffic.Bandwidth for the CBWFQ class-default class, for instance, is takenfrom the remaining 25 percent.However, under aggressive circumstances in which you want to configuremore than 75 percent of the interface bandwidth to classes, you canoverride the 75 percent maximum sum allocated to all classes or flowsusing the max-reserved-bandwidth command. If you want to override thedefault 75 percent, exercise caution and ensure that you allow enoughremaining bandwidth to support best-effort and control traffic, andLayer 2 overhead."Hope this helpsGuru Prashantt

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