Pfc Qos Configuration Guidelines And Restrictions; Guidelines - Cisco 6500 Series Software Configuration Manual

Chapter 31 Configuring PFC QoS
Table 31-2 PFC QoS Default Configuration (continued)
Feature
Transmit-queue size ratio
CoS value and drop threshold mapping

PFC QoS Configuration Guidelines and Restrictions

Follow these guidelines and restrictions when configuring PFC QoS:

Guidelines:

•
•
•
•
CIR and PIR Rate Value Range
32768 to 2097152
2097153 to 4194304
4194305 to 8388608
8388609 to 16777216
16777217 to 33554432
33554433 to 67108864
67108865 to 134217728
34217729 to 268435456
268435457 to 536870912
536870913 to 1073741824
1073741825 to 2147483648
2147483649 to 4294967296
78-14099-04
Default Value
Low priority: 100% (other queues not used)
All CoS values mapped to the low-priority queue.
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
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:
(128 Mbps) 2097152
(256 Mbps) 4194304
(512 Mbps) 8388608
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
Granularity
(2 Mbps) 32768 (32 Kb)
(4 Mbps) 65536 (64 Kb)
(8 Mbps) 131072 (128 Kb)
(16 Mbps) 262144 (256 Kb)
(32 Mbps) 524288 (512 Kb)
(64 Mbps) 1048576 (1 Mb)
(2 Mb)
(4 Mb)
(8 Mb)
(1 Gps) 16777216 (16 Mb)
(2 Gps) 33554432 (32 Mb)
(4 Gps) 67108864 (64 Mb)
PFC QoS Configuration Guidelines and Restrictions
"Configuring Policy Map Class Actions"
31-31