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Cisco Firewall IOS 1
- Thread starter Hoss1023
- Start date
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1
- #2
Good point
However, with CAR you don't have to drop packets. You can perform a match and queue for transmit when traffic burst drops to acceptable levels. Though you do run into the chances of having the packet get dropped anyhow due to time constraints.
CAR performs two quality of service (QoS) functions:
Bandwidth management through rate limiting. This function allows you to control the maximum rate for traffic transmitted or received on an interface. CAR is often configured on interfaces at the edge of a network to limit traffic into or out of the network. Traffic that falls within the rate parameters is transmitted, while packets that exceed the acceptable amount of traffic are dropped or transmitted with a different priority.
Packet classification through IP precedence and QoS group setting. This function allows you to partition your network into multiple priority levels or classes of service (CoS).
Use CAR to set the IP precedence for packets entering the network. Networking devices within your network can then use the adjusted IP precedence to determine how the traffic is treated. For example, DWRED uses the IP precedences to determine the probability a packet will be dropped.
Use CAR to assign packets to a QoS group. The router uses the QoS group to determine how it treats packets.
However, with CAR you don't have to drop packets. You can perform a match and queue for transmit when traffic burst drops to acceptable levels. Though you do run into the chances of having the packet get dropped anyhow due to time constraints.
CAR performs two quality of service (QoS) functions:
Bandwidth management through rate limiting. This function allows you to control the maximum rate for traffic transmitted or received on an interface. CAR is often configured on interfaces at the edge of a network to limit traffic into or out of the network. Traffic that falls within the rate parameters is transmitted, while packets that exceed the acceptable amount of traffic are dropped or transmitted with a different priority.
Packet classification through IP precedence and QoS group setting. This function allows you to partition your network into multiple priority levels or classes of service (CoS).
Use CAR to set the IP precedence for packets entering the network. Networking devices within your network can then use the adjusted IP precedence to determine how the traffic is treated. For example, DWRED uses the IP precedences to determine the probability a packet will be dropped.
Use CAR to assign packets to a QoS group. The router uses the QoS group to determine how it treats packets.
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