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670 CHAPTER 48: TRAFFIC POLICING, TRAFFIC SHAPING AND LINE RATE
■ Destination IP address
■ Destination MAC address
■ Application port
■ IP protocol type
■ Other standards that may be identified through the access list and extended
access list.
The packets can also be classified based on the external conditions of the network.
For example, the client types may classify the packets. After the packet is
classified, the user can apply the ACL or CARL on a specified interface and set the
corresponding actions for the interface, such as rate limiting (to specify CIR, CBS,
EBS), discard, resetting priority and direct forwarding.
CAR adopts the following two types of rules:
■ IP access control list (standard access control list or extended access control list)
■ CAR rule list (CARL, when defining CARL, you can perform traffic classification
according to IP priority and MAC address).
The CAR rules can be independent of each other. That is, each CAR rule reacts to a
certain type of the packets separately. A cascade of CAR rules can also be used in
which a packet is matched with successive CAR rules.
Multiple CAR rules can be used on an interface. The router can attempt to match
the CAR rules in configured order until it matches one successfully. If no matched
rules are found, rate limiting is not implemented.
CAR Configuration CAR configuration includes:
■ Defining Rules
■ Applying the CAR Policy on the Interface
■ Displaying and Debugging CAR
Defining Rules
On the network border, it is necessary to classify the packets. The classification
standards can set varied priorities for the varied classifications of either all the
packets received from a specified interface or a group of packets defined by the
rule command. Inside a network, the modified priority can be used as the
classification standard. At the same time, for the packets of each category,
different processing can be defined for those exceeding and those not exceeding
the traffic limit in a unit time.
Please perform the following configurations in the system view.
Table 711 Define CAR Rules
Operation Command
Define the CAR rule qos carl carl-index { precedence
precedence-value | mac mac-address }
Delete the CAR rule undo qos carl carl-index