Cisco ASR 9000 Series Service Configuration Guide

Configuring Modular QoS Congestion Management on Cisco ASR 9000 Series Routers
How to Configure QoS Congestion Management on Cisco ASR 9000 Series Routers
QC-51
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
How to Configure QoS Congestion Management on
Cisco
ASR 9000 Series Routers
This section contains instructions for the following tasks:
• Configuring Guaranteed and Remaining Bandwidths, page 51
• Configuring Low-Latency Queueing with Strict Priority Queueing, page 57
• Configuring Traffic Shaping, page 60
• Configuring Traffic Policing, page 62
Configuring Guaranteed and Remaining Bandwidths
Guaranteed Service rate of a queue is defined as the bandwidth the queue receives when all the queues
are congested. It is defined as:
Guaranteed Service Rate = minimum bandwidth + excess share of the queue
The bandwidth command allows you to specify the minimum guaranteed bandwidth to be allocated for
a specific class of traffic. MDRR is implemented as the scheduling algorithm.
The bandwidth remaining command specifies a weight for the class to the MDRR. The MDRR
algorithm derives the weight for each class from the bandwidth remaining value allocated to the class.
The bandwidth remaining is divided among the classes in a policy using either bandwidth remaining
ratio or bandwidth remaining percent commands. If you do not configure the bandwidth remaining
command for any class, the leftover bandwidth is allocated equally to all classes for which bandwidth
remaining is not explicitly specified.
Restrictions
The amount of bandwidth configured should be large enough to also accommodate Layer 2 overhead.
The bandwidth command is supported only on policies configured on outgoing interfaces.
Configuring Guaranteed Bandwidth
SUMMARY STEPS
1. configure
2. policy-map policy-name
3. class class-name
4. bandwidth {rate [units] | percent percentage-value}
5. exit
6. class class-name
7. bandwidth {rate [units] | percent percentage-value}
8. exit
9. class class-name
10. bandwidth {rate [units] | percent percentage-value}

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model