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CCNP BSCI Exam Tutorial Route Summarization And The OSPF Null InterfaceCCNP exam success, particularly on the BSCI exam, demands you understand the details of route summarization. This skill not only requires that you have a comfort level with binary conversions, but you have to know how and where to apply route summarization with each individual protocol. Cisco CCNA Certification Exam Tutorial Access List Details You Must Know Cisco CCNA Certification Exam Tutorial: Access List Details You Must Know! To pass the CCNA exam, you have to be able to write and troubleshoot access lists. As you climb the ladder toward the CCNP a.. R1(config)#router ospf 1 R1(config-router)#redistribute connected subnets R1(config-router)#summary-address 16.0.0.0 252.0.0.0 The summary address appears on R2, a downstream router. R2#show ip route ospf O E2 16.0.0.0/6 [110/20] via 172.12.123.1, 00:00:05, Serial0 Let's go back to R1 and look at its OSPF table. R1#show ip route ospf O 16.0.0.0/6 is a summary, 00:01:51, Null0 Where did the null0 interface come from, and why is it there? Packets sent to the null interface are dropped, and in this case, that's a good thing. When you configure summary routes in OSPF, a route to null0 will be installed into the OSPF routing table. This helps to prevent routing loops. Any packets destined for the routes that have been summarized will have a longer match in the routing table, as shown below... Cisco CCNP BCMSN Exam Tutorial Multicasting And The RPF Check Cisco CCNP / BCMSN Exam Tutorial: Multicasting And The RPF Check Multicasting is a vital topic on your BCMSN, CCNP, and CCIE exams, and it can also be very confusing when you first start studying it... C 17.0.0.0/8 is directly connected, Loopback17 C 16.0.0.0/8 is directly connected, Loopback16 C 19.0.0.0/8 is directly connected, Loopback19 C 18.0.0.0/8 is directly connected, Loopback18 O 16.0.0.0/6 is a summary, 00:01:51, Null0 .. and packets that do not match one of the summarized routes but do match the summary route will be dropped. Preventing routing loops when performing route redistribution and summarization is vital. OSPF gives us a little help in that regard in this situation, and as you study more complex redistribution scenarios on your way to the CCNP and CCIE, you'll realize that we'll take all the help we can get! Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of freeCCNP andCCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. You can also join his RSS feed and visit his blog, which is updated several times daily with new Cisco certification articles, free tutorials, and daily CCNA / CCNP exam questions! Details are on the website. For a FREE copy of his latest e-books, ,How To Pass The CCNA, and ,How To Pass The CCNP,, just visit the website! You can also get FREE CCNA and CCNP exam questions every day! Get yourCCNP certification with The Bryant Advantage!
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