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CHAPTER
35-1
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
35
Configuring Policy-Based Routing
This chapter describes the tasks for configuring policy-based routing (PBR) on a Catalyst 4500 series
switch and includes these major sections:
• About Policy-Based Routing, page 35-1
• Policy-Based Routing Configuration Tasks, page 35-6
• Policy-Based Routing Configuration Examples, page 35-8
Note For complete syntax and usage information for the switch commands used in this chapter, look at the
Cisco Catalyst 4500 Series Switch Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/hw/switches/ps4324/index.html
If the command is not found in the Catalyst 4500 Command Reference, it is located in the larger Cisco
IOS library. Refer to the Cisco IOS Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/ps6350/index.html
Note To identify the hardware platform or software image information associated with a feature, use the
Feature Navigator on Cisco.com to search for information about the feature or refer to the software
release notes for a specific release.
About Policy-Based Routing
This section contains the following sections:
• About PBR, page 35-2
• PBR Flow Switching, page 35-5
• Using Policy-Based Routing, page 35-5
PBR gives you a flexible method of routing packets by allowing you to define policies for traffic flows,
lessening reliance on routes derived from routing protocols. PBR gives you more control over routing
by extending and complementing the existing mechanisms provided by routing protocols. PBR allows
you to specify paths for certain traffic, such as priority traffic over a high-cost link.