Pfc Qos Feature Flowcharts - Cisco 7609 Configuration Manual

Cisco ios software configuration guide—12.1e

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Table of Contents

Understanding How PFC QoS Works

PFC QoS Feature Flowcharts

Figure 32-1 Traffic Flow Through PFC QoS Features with PFC2

Frame enters

enters switch

PFC QoS supports traffic from OSMs with Release 12.1(11a)E and later.

Figure 32-2 Traffic Flow Through PFC QoS Features with PFC

Frame enters

Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E

show how traffic flows through the components that support PFC QoS features.

ingress port

CoS = 0 for all ATM and POS traffic

(not configurable)

The PFC can provide Layer 3 switching for FlexWAN traffic but does not provide PFC QoS for

FlexWAN traffic.

PFC QoS does not change the ToS byte in FlexWAN ingress traffic.

Traffic that is Layer 3-switched does not go through the MSFC and retains the Layer 2 CoS value

assigned by the PFC.

Policy Feature Card 2

QoS features

Policy Feature

show how the PFC QoS features are implemented on the router

Configuring PFC QoS

CoS = IP precedence

for all traffic

(not configurable)

Multilayer Switch

Feature Card 2

CoS = 0 for all traffic

(not configurable)

Multilayer Switch

Feature Card (MSFC)