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01.15.07


OSPF Route Redistribution Review

By Chris Bryant

OSPF route redistribution is an important topic on the BSCI exam, and its a topic full of details and defaults that you need to know for the exam room and the job.

To help you pass the BSCI exam, heres a quick review of some of the OSPF route redistribution basics.

To see if a router is an ABR or ASBR, run show ip ospf. This also displays any routes being redistributed into OSPF on this router.

R1#show ip ospf

Routing Process "ospf 1" with ID 1.1.1.1

Supports only single TOS(TOS0) routes

Supports opaque LSA

It is an area border and autonomous system boundary router

Redistributing External Routes from,

connected, includes subnets in redistribution

rip, includes subnets in redistribution


When redistributing RIP into OSPF, the "subnets" option is needed to include subnets in redistribution. When redistributing OSPF into RIP, a seed metric must be specified. (OSPF gives redistributed routes a default metric of 20 - this can be changed, but a seed metric does not have to be set.)

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R1(config)#router ospf 1

R1(config-router)#redistribute connected

% Only classful networks will be redistributed

R1(config-router)#redistribute connected subnets

R1(config-router)#redistribute rip subnets

R1(config-router)#router rip

R1(config-router)#redistribute connected metric 1

R1(config-router)#redistribute ospf 1 metric 1


By default, routes redistributed into OSPF are marked as E2 routes. The metric for these routes reflects only the cost of the path from the ASBR to the destination network and does not include the cost of the path from the local router to the ASBR. By contrast, E1 routes include the cost of the entire path from the local router to the destination network.

Continue reading this article.


About the Author:
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of FREE CCNA and CCNP tutorials and daily exam questions, as well as The Ultimate CCNA and CCNP Study Packages.

For a FREE copy of his latest e-books, "How To Pass The CCNA" or "How To Pass The CCNP", and for free daily exam question, visit the website and download your copies!

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