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Configuring the Switch
3-252
3
Configuring Summary Addresses (for External AS Routes)
An Autonomous System Boundary Router (ASBR) can redistribute routes learned
from other protocols into all attached autonomous systems. (See “Redistributing
External Routes” on page 3-253) To reduce the amount of external LSAs imported
into your local routing domain, you can configure the router to advertise an
aggregate route that consolidates a broad range of external addresses.
Command Usage
If you are not sure what address ranges to consolidate, first enable external route
redistribution via the Redistribute Configuration screen, view the routes imported
into the routing table, and then configure one or more summary addresses to
reduce the size of the routing table and consolidate these external routes for
advertising into the local domain.
To summarize routes sent between OSPF areas, use the Area Range
Configuration screen (page 3-241).
Command Attributes
IP Address Summary address covering a range of addresses.
Netmask – Network mask for the summary route.
Note:
This router supports up 16 Type-5 summary routes.
Web - Click Routing Protocol, OSPF, Summary Address Configuration. Specify the
base address and network mask, then click Add.
Figure 3-142 OSPF Summary Address Configuration
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