User Guide

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Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
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Chapter 31 Configuring PFC QoS
PFC QoS Configuration Guidelines and Restrictions
Within each range, PFC QoS programs the PFC hardware with rate values that are multiples of the
granularity values.
• PFC QoS has the following hardware granularity for CIR and PIR token bucket (burst) sizes:
Within each range, PFC QoS programs the PFC hardware with token bucket sizes that are multiples
of the granularity values.
• For these commands, PFC QoS applies identical configuration to all LAN ports controlled by the
same application-specific integrated circuit (ASIC) or group of ASICs (see the port group
information for each module in the Release Notes):
– rcv-queue queue-limit
– wrr-queue queue-limit
– wrr-queue bandwidth (except Gigabit Ethernet LAN ports)
– priority-queue cos-map
– rcv-queue cos-map
– wrr-queue cos-map
– wrr-queue threshold
– rcv-queue threshold
– wrr-queue random-detect
– wrr-queue random-detect min-threshold
– wrr-queue random-detect max-threshold
Restrictions
• PFC QoS filters only by access lists, dscp values, or IP precedence values.
• PFC QoS does not support the following commands and configurations:
– match cos, match any, match classmap, match destination-address, match input-interface,
match mpls, match qos-group, or match source-address class map commands
– class maps that contain multiple match commands
CIR and PIR Token Bucket Size Range Granularity
1 to 32768 (32 KB) 1024 (1 KB)
32769 to 65536 (64 KB) 2048 (2 KB)
65537 to 131072 (128 KB) 4096 (4 KB)
131073 to 262144 (256 KB) 8196 (8 KB)
262145 to 524288 (512 KB) 16392 (16 KB)
524289 to 1048576 (1 MB) 32768 (32 KB)
1048577 to 2097152 (2 MB) 65536 (64 KB)
2097153 to 4194304 (4 MB) 131072 (128 KB)
4194305 to 8388608 (8 MB) 262144 (256 KB)
8388609 to 16777216 (16 MB) 524288 (512 KB)
16777217 to 33554432 (32 MB) 1048576 (1 MB)