Cisco CRS Command Reference Guide

Within a policy map, you can give one or more classes priority status. When multiple classes within a single
policy map are configured as priority classes, all traffic from these classes at same priority level is queued to
the same priority queue. There is one priority queue per level in a group.
Modifying CRS-MSC-40G QoS Configurations for CRS-MSC-140G
On the Cisco CRS Series Modular Services Card 40G (CRS-MSC-40G), a priority action can be configured
with or without a police action in the same class.
On the Cisco CRS Series Modular Services Card 140G (CRS-MSC-140G), a police action must be configured
in the same class as the priority action. A class configuration that includes a priority action but no police action
is not valid. Such a configuration is rejected.
To use existing CRS-MSC-40G QoS configurations on the CRS-MSC-140G, add a police action to all classes
that have a priority action.
Priority assignment at the group level for an egress interface policy is not supported.
The requirement to configure a policer does not apply to fabric QoS polices, because police actions in
fabric QoS policies are not supported.
Note
Task ID
OperationsTask ID
read, writeqos
Examples
The following example shows how to configure priority queuing for the policy map named policy1:
RP/0/RP0/CPU0:router(config)# policy-map policy1
RP/0/RP0/CPU0:router(config-pmap)# class class1
RP/0/RP0/CPU0:router(config-pmap-c)# priority level 1
RP/0/RP0/CPU0:routerpolice rate percent 20
Related Commands
DescriptionCommand
Specifies the minimum bandwidth allocated to a class belonging to
a policy map.
bandwidth (QoS), on page 4
Creates or modifies a policy map that can be attached to one or more
interfaces to specify a service policy.
policy-map, on page 67
Displays policy configuration information for all classes configured
for all service policies on the specified interface.
show policy-map interface, on page 125
Cisco IOS XR Modular Quality of Service Command Reference for the Cisco CRS Router, Release 4.0
70 OL-23235-03
Quality of Service Commands on the Cisco IOS XR Software
priority (QoS)

Cisco CRS Specifications

General

Operating System	Cisco IOS XR
Product Type	Core Router
Form Factor	Modular Chassis
Dimensions	Varies by chassis type
Weight	Varies by chassis type
Architecture	Distributed
Switch Fabric	Multi-stage
Interface Support	Ethernet, SONET/SDH, OTN
Interfaces/Ports	Varies by line card
Port Density	Varies by line card
Routing Protocol	BGP, IS-IS, OSPF, MPLS
Management	CLI, SNMP
Power Supply	Redundant, hot-swappable
Cooling	Redundant, Hot-swappable Fan Trays
Supported Protocols	IPv4, IPv6, MPLS
Management Interfaces	Ethernet, console
Security Features	ACLs