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CCIE #29033
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What is CAR and how would you use it?
1 comments:
Committed Access Rate - CAR can be used to rate-limit traffic. CAR can match based on IP precedence, QoS group, incoming interface, or IP access list. Actions include transmit, drop, set precedence, or set QoS group when traffic conforms to or exceeds the rate limit. Rate limit can be used on an interface both input and output.
All Web traffic is transmitted. Traffic limited to 2Mbps and normal burst is 37500 bytes and exceed is 75000 bytes. Exceed traffic is set to IP Prec 0 (best effort)
config-if#rate-limit input access-group 120 200000 37500 75000 conform-action
transmit exceed-action set-prec-transmit 0
config#access-list 120 permit tcp any any eq www
Math :
Burst-normal = configured rate * 1/8 * 1.5 seconds (1/8 for convert bit to byte)
Burst-max = Burst-normal * 2
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