Cabletron Systems SmartSwitch Router, User'S Reference Manual

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Chapter 11: Routing Policy Configuration Guide
178 SmartSwitch Router User Reference Manual
routes to be exported can be identified by their associated attributes, such as protocol
type, interface or the gateway from which the route was received, and so on.
• Route Filter - This component provides the means to define a filter for the routes to be
distributed. Routes that match a filter are considered as eligible for redistribution. This
can be done using one of two methods:
– Creating a route-filter and associating an identifier with it. A route-filter has
several network specifications associated with it. Every route is checked against
the set of network specifications associated with all route-filters to determine its
eligibility for redistribution. The identifier associated with a route-filter is used in
the
ip-router policy export command.
– Specifying the networks as needed in the ip-router policy export command.
If you want to create a complex route-filter, and you intend to use that route-filter in
several export policies, then the first method is recommended. It you do not have
complex filter requirements, then use the second method.
After you create one or more building blocks, they are tied together by the iprouter policy
export command.
To create route export policies, enter the following command in Configure mode:
The <exp-dest-id> is the identifier of the export-destination which determines where the
routes are to be exported. If no routes to a particular destination are to be exported, then
no additional parameters are required.
The <exp-src-id> , if specified, is the identifier of the export-source which determines the
source of the exported routes. If a export-policy for a given export-destination has more
than one export-source, then the
ip-router policy export destination <exp-dest-id> command
should be repeated for each <exp-src-id> .
The <filter-id> , if specified, is the identifer of the route-filter associated with this export-
policy. If there is more than one route-filter for any export-destination and export-source
combination, then the
ip-router policy export destination <exp-dest-id> source <exp-src-id>
command should be repeated for each <filter-id> .
Create an export
policy.
ip-router policy export destination
<exp-dest-id>
[source
<exp-src-id>
[filter
<filter-id>
|[network
<ipAddr-mask>
[exact|refines|between
<low-high>
]
[metric
<number>
|restrict]]]]