What is CAR?

• Token bucket mechanism

• Two functions: rate-limiting and packet classification

• Configured on a per-interface basis

• Rate-limit...

  • traffic based on matches in extended access-lists
  • traffic based on source MAC address
  • traffic based on IP precedence

• Set or reset IP precedence bits in the IP packet header (“color the traffic”) based on the above criteria

• http://cco.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/car.htm

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