Dell PowerConnect J-8216 Software Guide for JUNOS version 10.3 - Page 2986

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS Defining CoS Code-Point Aliases (CLI Procedure) You can use code-point aliases to streamline the process of configuring CoS features on your J-EX Series switch. A code-point alias assigns a name to a pattern of code-point bits. You can use this name instead of the bit pattern when you configure other CoS components such as classifiers, drop-profile maps, and rewrite rules. You can configure code-point aliases for the following CoS marker types: • DSCP-Handles incoming IPv4 packets. • IEEE 802.1p-Handles Layer 2 CoS. • Inet precedence-Handles incoming IPv4 packets. IP precedence mapping requires only the higher order three bits of the DSCP field. To configure a code-point alias for a specified CoS marker type (dscp), assign an alias (my1) to the code-point (110001): [edit class-of-service code-point-aliases] user@switch# set dscp my1 110001 Related • Defining CoS Code-Point Aliases (J-Web Procedure) on page 2912 Documentation • Example: Configuring CoS on J-EX Series Switches on page 2883 • Monitoring CoS Value Aliases on page 2940 • Understanding CoS Code-Point Aliases on page 2864 Defining CoS Classifiers (CLI Procedure) Packet classification associates incoming packets with a particular CoS servicing level. Classifiers associate packets with a forwarding class and loss priority and assign packets to output queues based on the associated forwarding class. The Junos OS supports two general types of classifiers: • Behavior aggregate or CoS value traffic classifiers-Examines the CoS value in the packet header. The value in this single field determines the CoS settings applied to the packet. BA classifiers allow you to set the forwarding class and loss priority of a packet based on the Differentiated Services code point (DSCP) value, IP precedence value, or IEEE 802.1p value. • Multifield traffic classifiers-Examines multiple fields in the packet such as source and destination addresses and source and destination port numbers of the packet. With multifield classifiers, you set the forwarding class and loss priority of a packet based on firewall filter rules. The following example describes how to configure a BA classifier ba-classifier as the default DSCP map and apply it to either a specific Gigabit Ethernet interface or to all the Gigabit Ethernet interfaces on the switch. The BA classifier assigns loss priorities, as shown in Table 370 on page 2915, to incoming packets in the four forwarding classes. 2914