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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 42 Configuring PFC QoS
Configuring PFC QoS
Mapping QoS Labels to Queues and Drop Thresholds
These sections describe how to map QoS labels to queues and drop thresholds:
Note Enter the show queueing interface {ethernet | fastethernet | gigabitethernet | tengigabitethernet}
slot/port | include type command to see the queue structure of a port.
These sections describe how to map QoS labels to queues and drop thresholds:
• Queue and Drop Threshold Mapping Guidelines and Restrictions, page 42-98
• Configuring DSCP-Based Queue Mapping, page 42-98
• Configuring CoS-Based Queue Mapping, page 42-104
Queue and Drop Threshold Mapping Guidelines and Restrictions
When mapping QoS labels to queues and thresholds, note the following information:
• When SRR is enabled, you cannot map any CoS values or DSCP values to strict-priority queues.
• Queue number 1 is the lowest-priority standard queue.
• Higher-numbered queues are higher priority standard queues.
• You can map up to 8 CoS values to a threshold.
• You can map up to 64 DSCP values to a threshold.
• Threshold 0 is a nonconfigurable 100-percent tail-drop threshold on these port types:
–
1p1q0t (receive)
–
1p1q8t (receive)
–
1p3q1t (transmit)
–
1p2q1t (transmit)
• The standard queue thresholds can be configured as either tail-drop or WRED-drop thresholds on
these port types:
–
1p1q8t (receive)
–
1p3q1t (transmit)
–
1p3q8t (transmit)
–
1p7q1t (transmit)
Configuring DSCP-Based Queue Mapping
These sections describe how to configure DSCP-based queue mapping:
• Configuring Ingress DSCP-Based Queue Mapping, page 42-99
• Mapping DSCP Values to Standard Transmit-Queue Thresholds, page 42-102
• Mapping DSCP Values to the Transmit Strict-Priority Queue, page 42-103
Note DSCP-based queue mapping is supported on WS-X6708-10GE ports.