Cisco 7604 Configuration Manual page 613

Ios software configuration guide

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Configuring PFC QoS

Figure 41-6 QoS Features on the PFC and DFCs

For trust CoS traffic:

(Received or Port)

For trust DSCP traffic:

For trust IP precedence traffic:

For untrusted traffic or

for any traffic if ignore

port trust is configured

When ignore port trust is not configured

When ignore port trust is configured,

received DSCP (if any) is initial internal

DSCP, otherwise port CoS is mapped

to initial internal DSCP

shows how traffic flows through the QoS features on the PFC and DFCs.

Ingress PFC QoS

Initial Internal DSCP=0

DSCP transparency

feature makes writing the egress DSCP value into the Layer 3 ToS byte optional.

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

Traffic Forwarding

MSFC routing

Understanding How PFC QoS Works

Egress PFC QoS

(only on PFC3)

(LAN ports only)

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