C
HAPTER
20
| Unicast Routing
Configuring the Open Shortest Path First Protocol (Version 2)
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Figure 345: Importing External Routes
To show the imported external route types:
1. Click Routing Protocol, OSPF, Redistribute.
2. Select Show from the Action list.
3. Select the process ID.
Figure 346: Showing Imported External Route Types
CONFIGURING
SUMMARY ADDRESSES
(FOR EXTERNAL AS
ROUTES)
Redistributing routes from other protocols into OSPF normally requires the
router to advertise each route individually in an external LSA as described
in the preceding section. The reduce the numer of protocol messages
required to redistribute these external routes, an Autonomous System
Boundary Router (ASBR) can instead be configured to redistribute routes
learned from other protocols into all attached autonomous systems.
To reduce the amount of external LSAs sent to other autonomous systems,
you can use the Routing Protocol > OSPF > Summary Address (Add) page
to configure the router to advertise an aggregate route that consolidates a
broad range of external addresses. This helps both to decrease the number
of external LSAs advertised and the size of the OSPF link state database.
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