BigIron RX Series Configuration Guide 53953-1002253-01Configuring numbered and named ACLs 21• The dscp-cos-mapping parameter takes the DSCP value you specified and compares it toan internal QoS table, which is indexed by DSCP values. The corresponding 802.1p priority,internal forwarding priority, and DSCP value is assigned to the packet.For example, if you enter dscp-marking 7 and the internal QoS table is configured asshown in Table 101, the new QoS value for the packet is:• 802.1p (COS) value: 7• DSCP value: 48• Internal Forwarding Priority: 0• Use the DSCP value in the packet’s header to alter its QoS value. Enter the followingparameter.dscp-cos-mappingWhen you enter dscp-cos-mapping, the DSCP value in the packet’s header is compared to acolumn in the internal QoS table. The 802.1p priority, internal forwarding priority, and DSCPvalue that are mapped to the matching column is assigned to the packet.For example, if the DSCP value in the packet’s header is 2, using the mappings in Table 101,the packet’s new QoS value is:• 802.1p (COS) value: 2• DSCP value: 15• Internal Forwarding Priority: 6For more information on QoS and internal forwarding queues, refer to Chapter 18, “ConfiguringQuality of Service”.Parameters to bind standard ACLs to an interfaceUse the ip access-group command to bind the ACL to an interface and enter the ACL number for.Configuring standard or extended named ACLsThe commands for configuring named ACL entries are different from the commands for configuringnumbered ACL entries. The command to configure a numbered ACL is access-list. The commandfor configuring a named ACL is ip access-list. In addition, when you configure a numbered ACLentry, you specify all the command parameters on the same command. When you configure anamed ACL, you specify the ACL type (standard or extended) and the ACL number with onecommand, which places you in the configuration level for that ACL. Once you enter theconfiguration level for the ACL, the command syntax is the same as the syntax for numbered ACLs.TABLE 101 Example internal QOS table mappingsDSCP value 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14802.1p (COS)Value0 1 2 3 4 5 6 7 1 2 3 4 5 6 7DSCP Value 0 15 20 3 4 5 25 48 8 9 10 11 12 13 14InternalForwardingPriority7 6 5 4 3 2 1 0 1 3 0 0 0 0 0
