Cisco Systems A9014CFD manual QoS Treatment for Performance-Monitoring Protocols, Cisco IP-SLAs

Chapter 24 Configuring QoS

QoS Treatment for Performance-Monitoring Protocols

QoS Treatment for Performance-Monitoring Protocols

This section contains the following topics:

•Cisco IP-SLAs, page 24-62

•QoS Treatment for IP-SLA Probes, page 24-62

•QoS Marking for CPU-Generated Traffic, page 24-62

•QoS Queuing for CPU-Generated Traffic, page 24-63

•Configuration Guidelines, page 24-80

Cisco IP-SLAs

For information about Cisco IP service level agreements (IP-SLAs), see Understanding Cisco IOS IP SLAs, page 3-2.

QoS Treatment for IP-SLA Probes

The QoS treatment for IP-SLA and TWAMP probes must exactly reflect the effects that occur to the normal data traffic crossing the device.

The generating device should not change the probe markings. It should queue these probes based on the configured queueing policies for normal traffic.

Marking

By default, the class of service (CoS) marking of CFM traffic (including IP SLAs using CFM probes) is not changed. This feature cannot change this behavior.

By default, IP traffic marking (including IP SLA and TWAMP probes) is not changed. This feature can change this behavior.

Queuing

The CFM traffic (including IP SLAs using CFM probes) is queued according to its CoS value and the output policy map configured on the egress port, similar to normal traffic. This feature cannot change this behavior.

IP traffic (including IP SLA and TWAMP probes) is queued according to the markings specified in the cpu traffic qos global configuration command and the output policy map on the egress port. If this command is not configured, all IP traffic is statically mapped to a queue on the egress port.

QoS Marking for CPU-Generated Traffic

You can use QoS marking to set or modify the attributes of traffic from the CPU. The QoS marking action can cause the CoS, DSCP, or IP precedence bits in the packet to be rewritten or left unchanged. QoS uses packet markings to identify certain traffic types and how to treat them on the local router and the network.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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