Cisco Catalyst 4500 Series - Restrictions for VRF-Aware Policy-Based Routing

42-7
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 42 Configuring Policy-Based Routing
Policy-Based Routing Configuration Tasks
Restrictions for VRF-Aware Policy-Based Routing
• The same route-map cannot be used to configure PBR:
– on interfaces that belong to different VRFs
– on one VRF interface and another global interface (an interface that is not part of a VRF).
• The set vrf and set ip global next-hop commands can be configured with the set default interface,
set interface, set ip default next-hop, and set ip next-hop commands. But the set vrf and set ip
global next-hop commands take precedence over the set default interface, set interface, set ip
default next-hop, and set ip next-hop commands. No error message is displayed if you attempt to
configure the set vrf command with any of these three set commands.
• The set global and set vrf commands cannot be simultaneously applied to a route map.
• When you use the set vrf command you specify the VRF table to be looked-up; this overrides the
default or global routing table. If a route is not specified in the VRF routing table, then packets are
dropped (even if a route exists in the global routing table).
• The set next-hop verify-availability command is not supported with VRF instances.
Policy-Based Routing Configuration Tasks
To configure PBR, perform the tasks described in the following sections. The task in the first section is
required; the tasks in the remaining sections are optional. For configuration examples, see the
“Policy-Based Routing Configuration Examples” section on page 42-16.
• Enabling IPv4 PBR, page 42-7 (Required)
• Enabling IPv6 PBR, page 42-10 (Required)
• Enabling Local IPv4 and Local IPv6 PBR, page 42-12 (Optional)
• Verifying Next-Hop IP using Object Tracking , page 42-14 (Optional)
• Unsupported Commands, page 42-15 (Optional)
• Configuring IPv4 and IPv6 PBR for VRF Instances, page 42-12 (Optional)
• Unsupported Commands, page 42-15
Enabling IPv4 PBR
To enable PBR, you must create a route map that specifies the match criteria and the resulting action if
all of the match clauses are met. Then you must apply that route-map on a particular interface. All
packets arriving on the specified interface matching the match clauses are subject to PBR.