Cisco Ccnp / Bsci Exam Tutorial: Ospf Route Redistribution Review

OSPF route redistribution is an important topic on the BSCI exam, and it's 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, here's 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.)

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.

O E2 5.1.1.1 [110/20] via 172.34.34.3, 00:33:21, Ethernet0

6.0.0.0/32 is subnetted, 1 subnets

O E2 6.1.1.1 [110/20] via 172.34.34.3, 00:33:21, Ethernet0

172.12.0.0/16 is variably subnetted, 2 subnets, 2 masks

O E2 172.12.21.0/30 [110/20] via 172.34.34.3, 00:33:32, Ethernet0

O E2 7.1.1.1 [110/20] via 172.34.34.3, 00:33:21, Ethernet0

15.0.0.0/24 is subnetted, 1 subnets

O E2 15.1.1.0 [110/20] via 172.34.34.3, 00:33:32, Ethernet0

To redistribute routes into OSPF and mark them as E1 upon redistribution, use the metric-type option with the redistribution command.

R1(config)#router ospf 1

R1(config-router)#redistribute rip subnets metric-type ?

1 Set OSPF External Type 1 metrics

2 Set OSPF External Type 2 metrics

R1(config-router)#redistribute rip subnets metric-type 1

Look at the same two routes in R4's routing table, which are now displayed as E1 routes:

O E1 5.1.1.1 [110/94] via 172.34.34.3, 00:04:13, Ethernet0

6.0.0.0/32 is subnetted, 1 subnets

O E1 6.1.1.1 [110/94] via 172.34.34.3, 00:04:14, Ethernet0

BSCI exam success and earning your CCNP certification depends on knowing the details, and there are plenty of details involved in OSPF route redistribution! Keep studying, practice different scenarios in your CCNA / CCNP home lab or rack rental, and you'll master these details and pass the exam!

By: Chris Bryant, CCIE #12933

Article Directory: http://www.articledashboard.com

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of free CCNA and CCNP 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”, visit the website and download your free copies. You can also get FREE CCNA and CCNP exam questions every day! Get your CCNA study guide from The Bryant Advantage!