Unanswered Question
Dec 19th, 2008

Hello all:

I would like to provide shared bandwidth to the customers in burst ability method,

i.e. if a customer is availing a 2 Mbps (1:2) ratio leased line,

the committed bandwidth for him is 1 Mbps all the time, based on the usage of other customers,

he should be able to burst his bandwidth up to 2 Mbps full.

What is the best way to acheive this any documen will be helpful



I have this problem too.
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Joseph W. Doherty Fri, 12/19/2008 - 10:38

Perhaps an easy method to accomplish your requirement is to use CBWFQ where the one customer's traffic is mapped into a class which specifies it gets at 50% of the 2 Mbps.


class-map match-all 50pct_cust

match access-group name (named ACL that matches your customer traffic)

policy-map yourpolicy

class 50pct_cust

bandwidth percent 50


For more information, look for class based weighted fair queue within your device's configuration guide. There's also additional information on Cisco's web site.

vishwancc Fri, 12/19/2008 - 23:24

Hi Jose,

The sample you have shown in your post does that mean that he customer will get 50% for sure and will get more if other customer are not using the bandwidth.



Joseph W. Doherty Sat, 12/20/2008 - 04:14

Yes, unless on some platforms the other traffic is within "class class-default" and the class is using FQ.

The primary purpose of CBWFQ class bandwidth allocations is to provide a minimum guarantee of bandwidth but the class may usually have more if it's available.


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