Cisco 7604 Configuration Manual page 612

Understanding How PFC QoS Works
Supported Policy Feature Cards
The policy feature card (PFC) is a daughter card that resides on the supervisor engine. The PFC provides
QoS in addition to other functionality. The following PFCs are supported on the Cisco 7600 series
routers:
•
•
•
•
Supported Distributed Forwarding Cards
The PFC sends a copy of the QoS policies to the distributed forwarding card (DFC) to provide local
support for the QoS policies, which enables the DFCs to support the same QoS features that the PFC
supports.
The following DFCs are supported on the Cisco 7600 series routers:
•
•
•
PFC and DFC QoS Feature List and Flowchart
Table 41-1
Table 41-1 QoS Features Supported on PFCs and DFCs
Feature
Support for DFCs
Flow granularity
QoS ACLs
DSCP transparency
Enabling DSCP transparency disables
Note
egress ToS rewrite.
Egress ToS rewrite
Policing:
Ingress aggregate policers
Egress aggregate policers
Number of aggregate policers
Microflow policers
Number of flows per Microflow policer
Unit of measure for policer statistics
Basis of policer operation
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
41-10
PFC2 on the Supervisor Engine 2
PFC3A on the Supervisor Engine 720
PFC3B on the Supervisor Engine 720 and Supervisor Engine 32
PFC3BXL on the Supervisor Engine 720
WS-F6K-DFC, for use on dCEF256 and CEF256 modules with a Supervisor Engine 2.
WS-F6K-DFC3A, WS-F6K-DFC3B, WS-F6K-DFC3BXL, for use on dCEF256 and CEF256
modules with a Supervisor Engine 720.
WS-F6700-DFC3A, WS-F6700-DFC3B, WS-F6700-DFC3BXL, for use on CEF720 modules with
a Supervisor Engine 720.
lists the QoS features supported on the different versions of PFCs and DFCs.
PFC2/DFC PFC3A/DFC3A
Yes Yes
Full flow Source
Destination
IP, IPX, MAC IP, MAC
No Optional
Mandatory Optional
Yes Yes
No Yes
1022 1022
64 rates 64 rates
32,000 64,000
Packets Bytes
Layer 3 length Layer 2 length Layer 2 length Layer 2 length
Chapter 41 Configuring PFC QoS
PFC3B/DFC3B PFC3BXL/DFC3BXL
Yes Yes
Source Source
Destination Destination
IP, MAC IP, MAC
Optional Optional
Optional Optional
Yes Yes
Yes Yes
1022 1022
64 rates 64 rates
110,000 240,000
Bytes Bytes
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