Table; Pre1 Pre2 Pre2; Feature History For Qos Policies; Defining Qos Actions Using A Policy Map - Cisco 10000 Series Configuration Manual

QoS Policies

Feature History for QoS Policies

Cisco IOS Release
Release 12.0(17)SL
Release 12.2(15)BX This feature was introduced on the PRE2.
Release 12.2(28)SB
Release 12.2(31)SB
Release 12.2(33)SB

Defining QoS Actions Using a Policy Map

A policy map associates a traffic class with one or more QoS actions. When configuring a policy map,
you specify the name of a class map and configure the actions you want the router to take on the matching
traffic. Before you can create class policies in a policy map, the class must have classification criteria
configured in a class map. The router supports QoS actions such as marking, policing, and bandwidth
distribution.
A single policy map can be attached to multiple interfaces concurrently. If you attempt to attach a policy
map to an interface when the sum of the bandwidth assigned to classes is greater than 99 percent of the
available bandwidth, the router logs a warning message and does not allocate the requested bandwidth
to all of the classes. If the policy map is already attached to other interfaces, it is removed from them.
Whenever you modify a class policy in an attached policy map, class-based weighted fair queuing
(CBWFQ) is notified and the new classes are installed as part of the policy map in the CBWFQ system.

System Limits for Policy Maps

Table 3-1

Table 3-1
Cisco IOS Release
All Releases prior to
Release 12.0(17)SL
Release 12.0(17)SL
and later releases
Release 12.0(25)SX
and later releases
Release 12.2(15)BX
and later releases
Release 12.3(7)XI
and later releases
Cisco 10000 Series Router Quality of Service Configuration Guide
3-2
Description
The policy map feature was introduced on the router.
This feature was integrated in Cisco IOS Release 12.2(28)SB
for the PRE2.
This feature was introduced on the PRE3.
This feature was enhanced to support 8192 policy maps per
system and implemented on the PRE3 and PRE4.
lists the system limits for policy maps supported on the Cisco 10000 series router.
System Limits for Policy Maps
Processor
PRE1
PRE1
PRE1
PRE2
PRE2
Chapter 3 Configuring QoS Policy Actions and Rules
1
Policy Maps per System
(up to this amount)
256
256
4096
256
4096
Required PRE
PRE1
PRE2
PRE2
PRE2, PRE3
PRE3, PRE4
No. Classes per
2
Policy Map
16
256
32
64
127
OL-7433-09