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17-1
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
17
Configuring Policy-Based Routing
This chapter describes how to configure policy based routing.
This chapter includes the following sections:
• Information About Policy Based Routing, page 17-1
• Licensing Requirements for Policy-Based Routing, page 17-3
• Prerequisites for Policy-Based Routing, page 17-3
• Guidelines and Limitations, page 17-3
• Configuring Policy-Based Routing, page 17-3
• Verifying Policy-Based Routing Configuration, page 17-7
• Policy Based-Routing Example Configuration, page 17-7
• Related Topics, page 17-8
• Default Settings, page 17-8
• Additional References, page 17-8
• Feature History for Policy-Based Routing, page 17-9
Information About Policy Based Routing
Policy-based routing allows you to configure a defined policy for IPv4 and IPv6 traffic flows, lessening
reliance on routes derived from routing protocols. All packets received on an interface with policy-based
routing enabled are passed through enhanced packet filters or route maps. The route maps dictate the
policy, determining where to forward packets.
Route maps are composed of match and set statements that you can mark as permit or deny. You an
interpret the statements as follows:
• If the packets match any route map statements, then all the set statements are applied. One of these
actions involves choosing the next hop.
• If a statement is marked as deny, the packets that meet the match criteria are sent back through the
normal forwarding channels and destination-based routing is performed.
• If the statement is marked as permit and the packets do not match any route map statements, the
packets are sent back through the normal forwarding channels and destination-based routing is
performed.
See the “Route Maps” section on page 16-2.
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