Dropping Packets Based On The Atm Cell Loss Priority; Configuration Example For Dropping Packets Based On The Cell Loss Priority - Cisco 10000 Series Configuration Manual

Chapter 11 Managing Packet Queue Congestion

Dropping Packets Based on the ATM Cell Loss Priority

To drop packets based on the ATM cell loss priority (CLP), enter the following commands beginning in
global configuration mode:
Note Dropping packets based on the CLP requires the PRE3 and Cisco IOS Release 12.2(33)SB, or a later
release.
Command
Step 1
Router(config)# policy-map
policy-map-name
Step 2
Router(config-pmap)# class class-map-name
Step 3
Router(config-pmap-c)# random-detect
atm-clp-based
Step 4
Router(config-pmap-c)# random-detect clp
[clp-value] [min-thresh-value]
[max-thresh-value]
[mark-probability-denominator-value]

Configuration Example for Dropping Packets Based on the Cell Loss Priority

Example 11-5
CLP 1 is classified as belonging to class1. In the policy map named policymap1, the class1 configuration
enables the ATM CLP-based WRED feature and configures WRED to randomly drop traffic with the
CLP bit set to 1 when traffic exceeds the minimum threshold of 12 and the maximum threshold of 25.
WRED uses a mark-probability-denominator of 10.
Example 11-5 Configuring CLP-Based WRED
Router(config)# class-map class1
Router(config-cmap)# match clp 1
Router(config-cmap)# exit
Router(config)# policy-map policymap1
OL-7433-09
Purpose
Specifies the name of the policy map to be created or modified.
Enters policy-map configuration mode.
policy-map-name is the name of the policy map.
Assigns the traffic class you specify to the policy map. Enters
policy-map class configuration mode.
class-map-name is the name of a previously configured class map
and is the traffic class for which you want to define QoS actions.
Indicates that weighted random early detection (WRED) is to use
the CLP value of a packet when calculating the packet drop
probability.
Configures WRED to drop packets based on the CLP value you
specify.
clp-value is a number that indicates the cell loss priority of a
packet. Valid values are 0 or 1.
(Optional) min-thresh-value is the minimum number of packets
allowed in the queue. Valid minimum threshold values are from 1
to 16,384.
(Optional) max-thresh-value is the maximum number of packets
allowed in the queue. Valid maximum threshold values are from
the value of the minimum threshold to 16,384.
(Optional) mark-probability-denominator-value is the drop rate.
Valid values are from 1 to 65,535. The default value is 10.
shows how to configure ATM CLP-based WRED. In the example, traffic that matches
Cisco 10000 Series Router Quality of Service Configuration Guide
Configuring Layer 3 Queue Limit and Drop Policies
11-31