Cisco WS-X6K-SUP1A-2GE Software Guide - Page 715
Ethernet Ingress Port Features, Layer 3 Switching Engine Features
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Chapter 41 Configuring QoS Understanding How QoS Works Ethernet Ingress Port Features With any switching engine, QoS supports classification, marking, scheduling, and congestion avoidance using Layer 2 CoS values at Ethernet ingress ports. Classification, marking, scheduling, and congestion avoidance at Ethernet ingress ports do not use or set Layer 3 IP precedence or DSCP values. With a Layer 3 switching engine, you can configure Ethernet ingress port trust states that can be used by the switching engine to set Layer 3 IP precedence or DSCP values and the Layer 2 CoS value. For more information, see the "Ethernet Ingress Port Marking, Scheduling, Congestion Avoidance, and Classification" section on page 41-10. Layer 3 Switching Engine Features With a Layer 3 switching engine, QoS supports classification, marking, and policing using IP, IPX, and Media Access Control (MAC) access control lists (ACLs). ACLs contain access control entries (ACEs) that specify Layer 2, 3, and 4 classification criteria, a marking rule, and policing rules. Marking sets the Layer 3 IP precedence or DSCP values and the Layer 2 CoS value to either received or configured Layer 2 or Layer 3 values. Policing uses bandwidth limits to either drop or mark nonconforming traffic. For more information, see the "Classification, Marking, and Policing with a Layer 3 Switching Engine" section on page 41-14. During processing, a Layer 3 switching engine associates a DSCP value with all traffic, including non-IP traffic (for more information, see the "Internal DSCP Values" section on page 41-15). Layer 2 Switching Engine Features With a Layer 2 Switching Engine, QoS can classify traffic using Layer 2 destination MAC addresses, VLANs, and marking using Layer 2 CoS values. Classification and marking with a Layer 2 Switching Engine do not use or set Layer 3 IP precedence or DSCP values. For more information, see the "Classification and Marking with a Layer 2 Switching Engine" section on page 41-24. Ethernet Egress Port Features With any switching engine, QoS supports Ethernet egress port scheduling and congestion avoidance using Layer 2 CoS values. Ethernet egress port marking sets Layer 2 CoS values and, with a Layer 3 switching engine, Layer 3 DSCP values. For more information, see the "Ethernet Egress Port Scheduling, Congestion Avoidance, and Marking" section on page 41-24. Single-Port ATM OC-12 Switching Module Features The ingress interface from a single-port ATM OC-12 switching module is untrusted, and QoS sets CoS to zero in all traffic received from it. With a Layer 3 switching engine, QoS can mark IP traffic transmitted to a single-port ATM OC-12 switching module with Layer 3 DSCP values. Multilayer Switch Feature Card (MSFC or MSFC2) QoS marks IP traffic transmitted to an MSFC with Layer 3 DSCP values. CoS is zero in all traffic sent from an MSFC to egress ports. Note Traffic that is Layer 3 switched does not go through the MFSC and retains the CoS value assigned by the Layer 3 switching engine. 78-13315-02 Catalyst 6000 Family Software Configuration Guide-Releases 6.3 and 6.4 41-9
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