set discard-class
To set the discard class and Quality of Service (QoS) group identifiers on IP Version 4 (IPv4) or Multiprotocol
Label Switching (MPLS) packets, use the set discard-class command in policy map class configuration
mode. To leave the discard-class values unchanged, use the no form of this command.
set discard-class discard-class-value
no set discard-class discard-class-value
Syntax Description
Discard class ID. An integer from 0 to 7, to be marked on the packet.
discard-class-value
Command Default
No group ID is specified.
Command Modes
Policy map class configuration
Command History
ModificationRelease
This command was introduced.Release 2.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
The set discard-class command associates a discard class ID with a packet. After the discard class and QoS
group IDs are set, other QoS services such as Modified Deficit Round Robin (MDRR) and Weighted Random
Early Detection (WRED) can operate on the bit settings.
Discard-class indicates the discard portion of the per hop behavior (PHB). The set discard-class command
is typically used in Pipe mode. Discard-class is required when the input PHB marking is used to classify
packets on the output interface.
The discard-class values can be used to specify the type of traffic that is dropped when there is congestion.
Marking of the discard class and the QoS group has only local significance on a node.Note
Task ID
OperationsTask ID
read, writeqos
Cisco IOS XR Modular Quality of Service Command Reference for the Cisco CRS Router, Release 4.0
100 OL-23235-03
Quality of Service Commands on the Cisco IOS XR Software
set discard-class
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