R2511-HP MSR Router Series ACL and QoS Command Reference(V5)

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System view
Default command level
2: System level
Parameters
carl-index: CAR list number in the range of 1 to 199.
precedence precedence: Specifies a precedence value in the range of 0 to 7.
mac mac-address: Specifies a MAC address in hexadecimal format.
dscp dscp-list: Specifies a list of DSCP values. A DSCP value is in the range of 0 to 63 or any of the
following keywords af11, af12, af13, af21, af22, af23, af31, af32, af33, af41, af42, af43, cs1, cs2, cs3,
cs4, cs5, cs6, cs7, default, or ef.
destination-ip-address: Configures a destination IP address-based CAR list.
source-ip-address: Configures a source IP address-based CAR list.
subnet ip-address mask-length: Specifies a subnet by the IP subnet address and IP subnet address mask
length.
range start-ip-address to end-ip-address: Specifies an IP address range by the start address and end
address. end-ip-address must be greater than start-ip-address.
per-address: Performs per-IP address rate limiting within the network segment. If this keyword is not
specified, rate limiting is performed for the entire network segment.
shared-bandwidth: Specifies that traffic of all IP addresses within the network segment shares the
remaining bandwidth.
Usage guidelines
You can create a CAR list based on IP precedence, MAC address, DSCP, or IP network segment.
You can create multiple CAR lists with different CAR list indexes or modify the parameters for one CAR
list.
You can configure up to eight precedence values for a CAR list. If the same precedence value is specified
multiple times, the system considers them as one value by default. If a packet matches a precedence
value on the CAR list, it matches the CAR list.
You can configure up to eight DSCP values for a CAR list. If a DSCP value is specified multiple times, the
system counts them as one value by default. If a packet matches a DSCP value on the CAR list, it matches
the CAR list.
To perform rate limiting for a single IP address, use the qos car acl command in interface view.
When you apply an IP network segment-based CAR list to an interface with the qos car command, the
CIR you defined takes different meanings depending on the configuration of the per-address keyword
and the shared-bandwidth keyword for the CAR list.
• If the per-address keyword is not specified, the CIR specifies the total bandwidth for the network
segment and will be allocated to each IP address based on its traffic size.
• If the per-address keyword is specified but the shared-bandwidth keyword is not specified, the CIR
specifies the bandwidth of each IP address, and the bandwidth cannot be shared by the other IP
addresses within the network segment.