Troubleshooting Route Summarization Cisco CCNP Certification / BSCI Exam Tutorial
As you earn your CCNA & CCNP certification, you are going to have to get comfortable with physically summarizing routes. This is not another reason to learn binary math (although it is a nice one!), but summarizing routes is a true real-world skill that can help your network operate more efficiently. So the query is not how to summarize routes, it is why.
When you summarize routes in RIP, IGRP, EIGRP, or OSPF, you are replacing a series of routes with a summary route & mask. With RIP, IGRP, & EIGRP, this actually lessens the size of the routing update packet itself - multiple routes are replaced with the summary route. For instance, the routes 8.0.0.0/8, 9.0.0.0/8, 10.0.0.0/8, & 11.0.0.0/8 can be summarized as 8.0.0.0 252.0.0.0. Only the summary address will be found in the update packet, making it concise yet complete.
To prepare for success on your CCNA & CCNP exam, you have got to know how to summarize routes as well as the specific commands for doing so with OSPF, EIGRP, RIP, & IGRP - but knowing why to summarize routes is as important as knowing how! Here are some additional tips on route summarization.
Summarizing routes can also make the routing table smaller, yet still permit for complete IP connectivity when done correctly. Using the above example, the two more-specific routes will be replaced by a single summary route. Since the entire routing table is parsed before the routing process is complete, keeping the routing table as small as possible does help speed the routing process as a whole.
RIP version 2 & EIGRP also both perform autosummarization on routes that are advertised across classful network boundaries. This is disabled with the protocol-level command "no auto-summary".
With RIP version 2 & EIGRP, manual route summarization is configured on the interface that will be advertising the summary. This is done with the route summarization command "ip summary-address."
With proper planning & an understanding of binary math, you'll master route summarization quickly with some practice - & you'll be ready for success on real-world networks as well as the CCNA & CCNP exams!
OSPF offers two different route summarization commands. To summarize routes from one OSPF area to another, use the "area range" command; to summarize routes learned via redistribution, use the "summary-address" command on the ASBR.
As you earn your CCNA & CCNP certification, you are going to have to get comfortable with physically summarizing routes. This is not another reason to learn binary math (although it is a nice one!), but summarizing routes is a true real-world skill that can help your network operate more efficiently. So the query is not how to summarize routes, it is why.
When you summarize routes in RIP, IGRP, EIGRP, or OSPF, you are replacing a series of routes with a summary route & mask. With RIP, IGRP, & EIGRP, this actually lessens the size of the routing update packet itself - multiple routes are replaced with the summary route. For instance, the routes 8.0.0.0/8, 9.0.0.0/8, 10.0.0.0/8, & 11.0.0.0/8 can be summarized as 8.0.0.0 252.0.0.0. Only the summary address will be found in the update packet, making it concise yet complete.
To prepare for success on your CCNA & CCNP exam, you have got to know how to summarize routes as well as the specific commands for doing so with OSPF, EIGRP, RIP, & IGRP - but knowing why to summarize routes is as important as knowing how! Here are some additional tips on route summarization.
Summarizing routes can also make the routing table smaller, yet still permit for complete IP connectivity when done correctly. Using the above example, the two more-specific routes will be replaced by a single summary route. Since the entire routing table is parsed before the routing process is complete, keeping the routing table as small as possible does help speed the routing process as a whole.
RIP version 2 & EIGRP also both perform autosummarization on routes that are advertised across classful network boundaries. This is disabled with the protocol-level command "no auto-summary".
With RIP version 2 & EIGRP, manual route summarization is configured on the interface that will be advertising the summary. This is done with the route summarization command "ip summary-address."
With proper planning & an understanding of binary math, you'll master route summarization quickly with some practice - & you'll be ready for success on real-world networks as well as the CCNA & CCNP exams!
OSPF offers two different route summarization commands. To summarize routes from one OSPF area to another, use the "area range" command; to summarize routes learned via redistribution, use the "summary-address" command on the ASBR.
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