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Cisco 7609 Configuration Manual page 408

Cisco ios software configuration guide—12.1e
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Understanding How PFC QoS Works
Figure 32-7 Egress WAN Port Marking
From PFC2 or
Figure 32-8 Egress LAN Port Scheduling, Congestion Avoidance, and Marking
From switching
engine or MSFC
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
32-10
MSFC2
Ethernet egress port scheduling, congestion avoidance, and marking
Drop thresholds
OSM switching module marking
Write ToS
Yes
IP traffic
byte into
from PFC?
packet
No
OSM
QoS
Features
Transmit
OSM traffic
Yes
IP traffic
from PFC?
No
Yes
ISL or
802.1Q?
No
Transmit
frame
Chapter 32
Configuring PFC QoS
PFC3
only
DSCP
Write ToS
Yes
rewrite
byte into
enabled?
packet
No
Write CoS
into
frame
78-14064-04

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