Cisco Catalyst 4500 Series, Software Configuration Manual

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C H A P T E R
42-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
42
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:
•
Policy-Based Routing, page 42-1
• Policy-Based Routing Configuration Tasks, page 42-7
•
Policy-Based Routing Configuration Examples, page 42-16
Note
For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch .
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases .
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.
Policy-Based Routing
Policy-Based Routing (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.
You can set up PBR as a way to route packets based on configured policies. For example, you can
implement routing policies to allow or deny paths based on the identity of a particular end system, or an
application protocol. Enable PBR to provide the following advantages:
• Equal access
•
Protocol-sensitive routing
• Source-sensitive routing
•
Routing based on interactive versus batch traffic
• Routing based on dedicated links