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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
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 ip-router
policy export command.
To create route export policies, enter the following command in Configure mode:
Create an export
policy.
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>.
Internet Appliance User Reference Manual
Chapter 9: Routing Policy Configuration Guide
ip-router policy export destination
<exp-src-id>
[source
<ipAddr-mask>
[exact|refines|between
<number>
[metric
<exp-dest-id>
<filter-id>
[filter
|restrict]]]]
|[network
<low-high>
]
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