User Manual

Enterasys X-Pedition User Reference Manual 251
Configuring Advanced Routing Policies
• 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 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 identifier 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]]]]