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Webcast-Catalyst9k
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CAR - Rate Limiting

I am having some issues using CAR. When I apply the rate-limit command to all outbound traffic, CAR works fine.

However, when I apply an access-list to the rate-limit command, my comformed and exceeded packets both show zero. Here is my config.

interface Serial0/0

ip address 201.150.30.2 255.255.255.252

ip access-group 101 in

rate-limit output access-group 102 512000 512000 512000 conform-action transmit exceed-action drop

no ip mroute-cache

access-list 102 permit ip host 201.150.30.240 any

access-list 102 permit ip host 201.150.30.241 any

access-list 102 permit ip host 209.150.30.242 any

Thanks

Again, when I remove the access-list CAR works fine. So it seems there is something wrong with the access-list, but it looks fine to me

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Re: CAR - Rate Limiting

rate-limit output access-group 102 512000 512000 512000 conform-action transmit exceed-action drop

In the above command the 512kb which you had for Normal burst size and Excess burst size seems to be high, configure a less value abd see whetehr it is working

Re: CAR - Rate Limiting

If you check the whitepaper http://www.cisco.com/warp/customer/cc/pd/iosw/tech/carat_wp.htm

Cisco recommended formula for calculating normal and extended burst values are:

norm.burst=(rate /8) *1.5

ext.burst= norm.burst * 2

For a bit rate of 512000 bps norm.burst= 96000, ext.burst=192000 should work.

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