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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 24 Configuring QoS
Configuring Quality of Service (QoS)
• Ethernet interfaces support ingress marking.
• Ethernet interfaces do not support Low-Latency Queuing (LLQ) (Ingress Priority) is not supported
on ingress
• Ethernet interfaces do not support Queuing, Shaping and Scheduling on ingress.
Egress QoS Functions
In Cisco ASR 901 router:
• Gigabit ethernet interfaces support egress classification.
• Gigabit ethernet interfaces do not support egress policing. All policing must be done on ingress.
• Gigabit ethernet interfaces support egress marking.
• Gigabit ethernet interfaces support egress scheduling.
• Interfaces support per interface and per qos-group shaping on egress ports.
• Interfaces support Low Latency Queuing (LLQ) and Weighted Random Early Detection (WRED)
on egress.
Configuring Quality of Service (QoS)
The following sections describe how to configure the Quality of Service (QoS) features supported by the
Cisco ASR 901 router.
• QoS Limitations
• QoS Configuration Guidelines
• Sample QoS Configuration
• Configuring Classification
• Configuring Marking
• Configuring Congestion Management
• Configuring Shaping
• Configuring Ethernet Trusted Mode
• Creating IP Extended ACLs
• Using Class Maps to Define a Traffic Class
• Creating a Named Access List
QoS Limitations
The Cisco ASR 901 offers different QoS support according to the physical interface and traffic type. The
following sections describe the limitations for each QoS capability on the Cisco ASR 901.
• General QoS Limitations
• Statistics Limitations
• Propagation Limitations
• Classification Limitations
• Marking Limitations