Cisco Systems 6500, EA6500 PFC QoS Configuration Guidelines and Restrictions

31-31

Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E

78-14099-04

Chapter 31 Configuring PFC QoS

PFC QoS Configuration Guidelines and Restrictions

PFC QoS Configuration Guidelines and Restrictions

Follow these guidelines and restrictions when configuring PFC QoS:

• With an MSFC2, Release 12.1(13)E and later releases support the match protocol class map

command, which configures NBAR and sends all traffic on the Layer 3 interface, both ingress and

egress, to be processed in software on the MSFC2. To configure NBAR, refer to this publication:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad.htm

Earlier releases provide PFC QoS and Layer 3 switching in hardware, which prevents support of the

match protocol class map command except for traffic being processed in software on the MSFC.

• With Release 12.1(12c)E1 and later releases, PFC QoS supports the set ip dscp and

set ip precedence policy map class commands (see the “Configuring Policy Map Class Actions”

section on page 31-44). With Release 12.1(12c)E1 and later releases, PFC QoS does not support the

set mpls experimental or set qos-group policy map class commands. With earlier releases, PFC

QoS does not support any set policy map class commands.

• With Release 12.1(11b)E1 and later releases, OSM QoS supports the set mpls experimental policy

map class command. Refer to the following publication for information about OSM QoS:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/cfgnotes/osm_inst/index.htm

• PFC QoS has the following hardware granularity for CIR and PIR rate values:

Transmit-queue size ratio Low priority: 100% (other queues not used)

CoS value and drop threshold mapping All CoS values mapped to the low-priority queue.

Table 31-2 PFC QoS Default Configuration (continued)

Feature Default Value

CIR and PIR Rate Value Range Granularity

32768 to 2097152 (2 Mbps) 32768 (32 Kb)

2097153 to 4194304 (4 Mbps) 65536 (64 Kb)

4194305 to 8388608 (8 Mbps) 131072 (128 Kb)

8388609 to 16777216 (16 Mbps) 262144 (256 Kb)

16777217 to 33554432 (32 Mbps) 524288 (512 Kb)

33554433 to 67108864 (64 Mbps) 1048576 (1 Mb)

67108865 to 134217728 (128 Mbps) 2097152 (2 Mb)

34217729 to 268435456 (256 Mbps) 4194304 (4 Mb)

268435457 to 536870912 (512 Mbps) 8388608 (8 Mb)

536870913 to 1073741824 (1 Gps) 16777216 (16 Mb)

1073741825 to 2147483648 (2 Gps) 33554432 (32 Mb)

2147483649 to 4294967296 (4 Gps) 67108864 (64 Mb)