Cisco 7604 Configuration Manual page 607
Ios software configuration guide
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Chapter 41
Configuring PFC QoS
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Figure 41-3
Figure 41-3 Traffic Flow and PFC QoS Features with PFC2
FlexWAN
FlexWAN traffic
ingress port and
enters switch
QoS features
LAN ingress
LAN traffic
port and
enters switch
QoS features
OSM ingress
OSM traffic
port and
enters switch
QoS freatures
CoS = 0 for all ATM and POS traffic (not configurable)
Figure 41-3
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OL-4266-08
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Egress PFC QoS and egress LAN-port QoS can be applied to LAN-port egress traffic.
For OSM traffic:
Ingress OSM-port QoS features can be applied to OSM-port ingress traffic.
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Ingress PFC3 QoS can be applied to OSM-port ingress traffic.
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Ingress OSM-port traffic can be Layer-3 switched by the PFC3 or routed in software by the MSFC.
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Egress PFC3 QoS and egress OSM-port QoS can be applied to OSM-port egress traffic.
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shows traffic flow and PFC QoS features with a PFC2.
Ingress
PFC2
QoS
shows how traffic flows through the PFC QoS features with PFC2:
Traffic can enter on any type of port and exit on any type of port.
DFCs implement PFC QoS locally on switching modules.
For FlexWAN module traffic:
Ingress FlexWAN QoS features can be applied to FlexWAN ingress traffic.
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Ingress FlexWAN traffic can be Layer 3-switched by the PFC2 or routed in software by the
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MSFC2.
Egress FlexWAN QoS can be applied to FlexWAN egress traffic.
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For LAN-port traffic:
Ingress LAN-port QoS features can be applied to LAN-port ingress traffic.
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Ingress LAN-port traffic can be Layer-2 or Layer-3 switched by the PFC2 or routed in software
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by the MSFC2.
Egress LAN-port QoS can be applied to LAN-port egress traffic.
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For OSM traffic:
OSM-port QoS features can be applied to OSM-port ingress traffic.
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Ingress PFC2 QoS can be applied to OSM-port ingress traffic.
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OSM-port ingress traffic can be Layer-3 switched by the PFC2 or routed in software by the
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MSFC2.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Multilayer Switch
Feature Card 2
(MSFC2)
PFC2
Layer 2 or 3
switching
Understanding How PFC QoS Works
FlexWAN
Transmit
egress port and
FlexWAN traffic
QoS features
CoS = IP precedence for all traffic
(not configurable)
LAN egress
Transmit
port and
LAN traffic
QoS features
OSM egress
Transmit
port and
OSM traffic
QoS freatures
41-5
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