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Cisco OSPF Command and Configuration Handbook by William R. Parkhurst - Ph.D., CCIE #2969

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Chapter 16. Summarizing External Routes

summary-address ip-address mask

 

summary-address ip-address mask not-advertise

Syntax Description:

  • ip-address—IP address of the summary route.

  • mask—Subnet mask used to generate the summary.

Purpose: OSPF can summarize routes that have been redistributed into OSPF. The summary can be applied to routes redistributed from a dynamic routing protocol, static routes, and connected routes. The router performing the redistribution is called an Autonomous System Boundary Router (ASBR). The summary-address command can be used on an ASBR or an Area Border Router (ABR). When used on an ABR, only external OSPF routes can be summarized. Using the not-advertise keyword suppresses the advertisement of the summary route by ...

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