User Manual

Configuring Advanced Routing Policies
250 Enterasys X-Pedition User Reference Manual
In the configuration shown in Figure 22 on page 260, suppose we decide to run RIP Version 2 on
network 120.190.0.0/16, connecting routers R1 and R2.
Router R1 would like to export all RIP, interface, and static routes to OSPF.
Router R1 would also like to export interface, static, RIP, OSPF, and OSPF-ASE routes into RIP.
Configuring Advanced Routing Policies
Advanced Routing Policies are used for creating complex import/export policies that cannot be
done using the redistribute command. Advanced export policies provide granular control over the
targets where the routes are exported, the source of the exported routes, and the individual routes
which are exported. It provides the capability to send different routes to the various route-peers.
They can be used to provide the same route with different attributes to the various route-peers.
Import policies control the importation of routes from routing protocols and their installation in the
routing database (Routing Information Base and Forwarding Information Base). Import policies
determine which routes received from other systems are used by the XP routing process. Using
import policies, it is possible to ignore route updates from an unreliable peer and give better
preference to routes learned from a trusted peer.
Export Policies
Advanced export policies can be constructed from one or more of the following building blocks:
• Export Destinations - This component specifies the destination where the routes are to be
exported. It also specifies the attributes associated with the exported routes. The interface,
gateway or the autonomous system to which the routes are to be redistributed are a few
examples of export-destinations. The metric, type, tag, and AS-Path are a few examples of
attributes associated with the exported routes.
ip-router policy redistribute from-proto rip to-proto ospf
ip-router policy redistribute from-proto direct to-proto ospf
ip-router policy redistribute from-proto static to-proto ospf
ip-router policy redistribute from-proto direct to-proto rip
ip-router policy redistribute from-proto static to-proto rip
ip-router policy redistribute from-proto rip to-proto rip
ip-router policy redistribute from-proto ospf to-proto rip
ip-router policy redistribute from-proto ospf-ase to-proto rip