Configuring OSPF Summarization During Redistribution

Unlike EIGRP, OSPF maintains a separate process for summarizing redistributed routes. This is called external route summarization. Consider the scenario depicted in Figure 3-16.

Fig u re 3-16 OSPE External Route Sutnmarization

Fig u re 3-16 OSPE External Route Sutnmarization

Router A redistributes RIP into OSPF. Normally, the redistribution injects 16 routes, each with a /24 mask, into area 0. Instead of doing that. Router A can summarize the 16 routes and inject just a single route into area 0. The follow ing is Router A's OSPF configuration:

router ospf 25 network area 0 summary-address

where summary-address is the key command that summarizes all 16 RIP routes into a single route Router A then advertises this summary route to area 0 so that the other OSPF backbone routers learn die route to the RIP destinations.

Was this article helpful?

0 0

Post a comment