Cisco 7609 User Manual

32-2
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
Chapter 32 Configuring PFC QoS
Understanding How PFC QoS Works
QoS selects network traffic (both unicast and multicast), prioritizes it according to its relative
importance, and uses congestion avoidance to provide priority-indexed treatment; QoS can also limit the
bandwidth used by network traffic. QoS makes network performance more predictable and bandwidth
utilization more effective.
Note On the Cisco 7600 series routers, queue architecture and QoS queueing features such as
Weighted-Round Robin (WRR) and Weighted Random Early Detection (WRED) are implemented with
a fixed configuration in Application Specific Integrated Circuits (ASICs). The queueing architecture
cannot be reconfigured. For more information, see the “Receive Queues” section on page 32-13 and the
“Transmit Queues” section on page 32-21.
These sections describe PFC QoS:
• Hardware Supported by PFC QoS, page 32-2
• QoS Terminology, page 32-3
• PFC QoS Feature Flowcharts, page 32-6
• PFC QoS Feature Summary, page 32-11
• Ingress LAN Port Features, page 32-12
• PFC Marking and Policing, page 32-16
• LAN Egress Port Features, page 32-21
• PFC QoS Statistics Data Export, page 32-24
Hardware Supported by PFC QoS
With Release 12.1(11a)E and later, PFC QoS supports both LAN ports and optical services module
(OSM) ports:
• LAN ports are Ethernet ports on Ethernet switching modules, except for the 4-port Gigabit Ethernet
WAN (GBIC) module (OSM-4GE-WAN). Except for the OSM-4GE-WAN module, OSMs have four
Ethernet LAN ports in addition to WAN ports. With earlier releases, PFC QoS supports only LAN
ports.
• OSM ports are the WAN ports on OSMs. The PFC provides ingress QoS for traffic from OSM ports.
For more information, see the following sections:
– “Ingress OSM Port Features” section on page 32-11
– “Egress OSM Port Features” section on page 32-12
– “PFC Marking and Policing” section on page 32-16
– “Attaching Policy Maps” section on page 32-21
– “Configuring the Trust State of Ethernet LAN and OSM Ingress Ports” section on page 32-53
• Refer to the following publication for information about additional OSM QoS features:
http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/cfgnotes/osm_inst/index.htm

Cisco 7609 Specifications

General

Chassis Slots	9
Switch Fabric Capacity	720 Gbps
Power Supply Options	AC or DC
Product Type	Router
Form Factor	Rack-mountable
Supported Line Cards	Various Cisco 7600 Series line cards
Operating System	Cisco IOS
Management	CLI, SNMP
Forwarding Performance	400 Mpps
Maximum Power Consumption	4000 Watts
Redundancy	Yes
Interfaces/Ports	Various, depending on line cards installed