Cisco 7604 Configuration Manual page 610
Ios software configuration guide
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Understanding How PFC QoS Works
Flowchart of Ingress LAN Port PFC QoS Features
Figure 41-5
Figure 41-5 Ingress LAN Port PFC QoS Features
trust-ipprec?
Port is set to
Note
•
•
•
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
41-8
shows how traffic flows through the ingress LAN port PFC QoS features.
Frame
enters
switch
No
Apply
ISL or
port
802.1Q?
CoS
Yes
Yes
Port set to
untrusted?
No
Port set to
Yes
No
No
DSCP-based
Port set to
Yes
queue mapping
trust-dscp?
enabled?
No
No
Ingress
CoS
trust-cos
Mutation?
Ingress CoS mutation is supported only on 802.1Q tunnel ports.
Release 12.2(18)SXF5 and later releases support the
DSCP-based queue mapping
IP
traffic with
No
recognizable
ToS byte?
Yes
Ignore
port trust
No
enabled?
IP
traffic with
Yes
Yes
recognizable
ToS byte?
No
CoS-to-queue
Ingress queues and
map
Yes
Mutate
CoS
ignore port trust
is supported only on WS-X6708-10GE ports.
Chapter 41
Configuring PFC QoS
Apply
port
CoS
DSCP-to-queue
map
drop thresholds
To
PFC
feature.
OL-4266-08
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