Cisco CCNP / BSCI Certification: Route Redistribution And The Seed Metric
Posted in Computers on June 16th, 2009 by cahyoIn the first part of this free CCNP / BSCI tutorial, we looked at how leaving one simple word out of our route redistribution configuration – “subnets” – resulted in an incomplete routing table when redistributing routes from RIP to OSPF. (If you missed that part of the tutorial, visit my website’s “Free Tutorials” section.) Today, we’ll look at redistributing OSPF routes into RIP and identify another common redistribution error.
We are using a three-router network. R5 is running RIP, R1 is serving as a hub between R5 and R3 and is running RIP and OSPF, and R3 is running OSPF.
To begin this lab, we’ll add three loopbacks to R3 and advertise them to R1 via OSPF.
R3(config-if)#ip address 33.3.3.3 255.255.255.255
R3(config-if)#ip address 34.3.3.3 255.255.255.255
R3(config-if)#ip address 35.3.3.3 255.255.255.255
R3(config-router)#network 33.3.3.3 0.0.0.0 area 1
R3(config-router)#network 34.3.3.3 0.0.0.0 area 1
R3(config-router)#network 35.3.3.3 0.0.0.0 area 1
R1 sees all three of these routes in its routing table.
34.0.0.0/32 is subnetted, 1 subnets
O IA 34.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0
35.0.0.0/32 is subnetted, 1 subnets
O IA 35.3.3.3 [110/65] via 172.12.123.3, 00:00:45, Serial0
33.0.0.0/32 is subnetted, 1 subnets
O IA 33.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0
We’ll now redistribute these routes into RIP on R1. Remember the “subnets” option we talked about in the first part of this tutorial? There is no such option when redistributing OSPF routes into RIP, as IOS Help shows us.
R1(config-router)#redistribute ospf 1 ?
match Redistribution of OSPF routes
metric Metric for redistributed routes
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