Cabletron Systems CoreWatch, Руководство пользователя

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CoreWatch User’s Manual 335
Chapter 16: Configuring Routing Policies on the SSR
8. Specify a tag for your optional path attribute in the
Tag
box.
9. Specify the community type by doing one of the following:
– To define specific community attributes for your optional path, select the
Community Attributes option and specify the relative community identification and
autonomous system in the Community ID and Autonomous System boxes,
respectively.
– To specify that you wish to tag routes with a well-known community
identification, select the
Well Known Community option and specify its relative
behavior by selecting on of the four following options from the associated drop-
down list:
– no-export
– no-advertise
– no-export-subconfed
– none
– To specify that you wish to tag routes with a particular reserved community
identification, select the
Reserved Community option and specify the community
identification in the associated text box.
10. Click OK .
Export Policies
An SSR’s export routing policies control which routes the SSR advertises to other systems.
Route exportation is controlled by both destination and source. Export policies specify the
destinations to which the router will export, the sources from which the router will export,
and the types of routes that will be exported, which can be either specific routes or all the
routes a router has learned.
Suppose the SSR is attached to RIP and OSPF routers as shown in the following figure.
Also suppose that RIP router 5 has learned all of the routes attached to RIP router 4. You
could configure an export policy that directs the SSR do the following:
• Export all the routes of OSPF router 3 to RIP router 6.
• Export to RIP router 2, all of the routes directly attached to RIP router 5 but only some
of the routes RIP router 5 has learned from RIP router 4.