hi all,

I have a question regarding the class-default inside CBWFQ/LLQ. According to Cisco docs the class-default should get at least 25% of bandwidth (default setting max-reserved-bandwidth) when the link is overloaded but in my config it is starved by others administratively set classes.

For example I created 2 classes:

policy-map cbwfq class class1 bandwidth 12 class class2 bandwidth 36

the policy-map was applied on Serial interface with badwidth parameter set to 64kb/s.

Then I send a lot of traffic from class1, class2 and not classified, but only packets from class1 and class2 riched the destination (in 1:3 ratio accordingly). In the "show policy-map interface" all not classified traffic was recognized as class-default but all packets were dropped !!! The question is - why the class-default becomes starving when the link is overloaded? Why the class-default doesn't get remaining (not reserved 16kb/s) bandwidth?

Can anyone give me an explanation for the above?

Thanks in advance, Alex

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