Cabletron Systems SmartSwitch Router, Руководство пользователя

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SmartSwitch Router User Reference Manual 177
Chapter 11: Routing Policy Configuration Guide
In the configuration shown in Figure 18 on page 187 , 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 SSR 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.
• Export Sources - This component specifies the source of the exported routes. It can also
specify the metric to be associated with the routes exported from this source. The
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