[c-nsp] CAR Configuration

[Jorge Evangelista]

Hi

I think that you might configure CAR with option continue, because
with this option CAR moves on to evaluate the next rate-limit command
on this interface that you define, but I suggest that you configure
GTS for traffic shapping, and the users  can use bandwidth available
in case not utilizing the capacity to maximum.


Here, an example from Cisco IOS Cookbook, 2nd Edition

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#access-list 101 permit tcp any eq www any
Router(config)#access-list 101 permit tcp any any eq www
Router(config)#access-list 103 permit ip any any
Router(config)#interface HSSI0/0
Router(config-if)#rate-limit output 50000 4500 4500 conform-action
transmit exceed-action continue
Router(config-if)#rate-limit output access-group 101 100000 4500 9000
conform-action set-prec-transmit 3 exceed-action continue
Router(config-if)#rate-limit output access-group 103 100000 4500 9000
conform-action set-prec-transmit 0 exceed-action drop
Router(config-if)#exit
Router(config)#end
Router#


In this example, the interface will transmit all packets when the rate
is 50,000 bps or less. As soon as the traffic exceeds rate, however,
the router starts to bump up the IP Precedence of all HTTP traffic to
a value of 3, and all other traffic goes down to a precedence of 0. It
will continue to transmit all of these packets until the average rate
exceeds 100,000 bps. You can use this sort of technique to carefully
tune how your network behaves in congestion situations.



On 3/5/07, Mark Tinka <mtinka at africaonline.co.zw> wrote:
> Hello all.
>
> Is there a known way I can get CAR to "block off" a pre-defined
> amount of bandwidth for a group of IP addresses (users), but then
> dynamically make that bandwidth available in case that group of
> users is not utilizing the capacity to maximum?
>
> Mark.
>
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-- 
"The network is the computer"