In 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.
Laptop Battery 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.
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Thinkpad To begin this lab, we'll add three loopbacks to R3 and advertise them to R1 via OSPF.
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Microsoft R3(config)#int loopback33
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Laptop Computers R3(config-if)#ip address 33.3.3.3 255.255.255.255
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Laptop Computer R3(config-if)#int loopback34
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Desktop Computer R3(config-if)#ip address 34.3.3.3 255.255.255.255
Notebooks R3(config-if)#int loopback35
Lenovo R3(config-if)#ip address 35.3.3.3 255.255.255.255
Hard Drive
R3(config-if)#router ospf 1
Travelstar R3(config-router)#network 33.3.3.3 0.0.0.0 area 1
Gateway R3(config-router)#network 34.3.3.3 0.0.0.0 area 1
Laptop Parts R3(config-router)#network 35.3.3.3 0.0.0.0 area 1
Software R1 sees all three of these routes in its routing table.
Hard Drives R1#show ip route ospf
Electronics 34.0.0.0/32 is subnetted, 1 subnets
Canon O IA 34.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0
Desktop Pc 35.0.0.0/32 is subnetted, 1 subnets
Desktop Computers O IA 35.3.3.3 [110/65] via 172.12.123.3, 00:00:45, Serial0
Think Pad 33.0.0.0/32 is subnetted, 1 subnets
Repair O IA 33.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0
Data Recovery 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.
Cisco R1(config)#router rip
Keyboard R1(config-router)#redistribute ospf 1 ?
Monitor match Redistribution of OSPF routes
Desktop metric Metric for redistributed routes
Infosys route-map Route map reference
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Lap Top R1(config-router)#redistribute ospf 1
Refurbished The routes have been redistributed into RIP with the redistribute ospf 1 command. (The "1" is the OSPF process number.) Let's look at R5 and see the results.
Memory R5#show ip route rip
Intel R5#
As400 The routes aren't there, but we didn't get a warning from the router that we needed to do anything else. What is the problem?
Averatec The problem is that RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP's sole metric is hop count. We've got to give RIP a metric it understands when redistributing routes into that protocol, so let's go back to R1 and do so.
Hardware R1(config)#router rip
Dual Xeon R1(config-router)#no redistribute ospf 1
Storage R1(config-router)#redistribute ospf 1 metric 2
Seagate R5 now sees the routes. Note that the metric contained in the brackets is the seed metric.
Computer Sales R5#show ip route rip
Computer Hardware 34.0.0.0/32 is subnetted, 1 subnets
Printers R 34.3.3.3 [120/2] via 100.1.1.1, 00:00:24, Ethernet0
Technology 35.0.0.0/32 is subnetted, 1 subnets
Mainframe R 35.3.3.3 [120/2] via 100.1.1.1, 00:00:24, Ethernet0
Samsung 33.0.0.0/32 is subnetted, 1 subnets
Computer Repair R 33.3.3.3 [120/2] via 100.1.1.1, 00:00:24, Ethernet0
Used Computers If you read the previous tutorial, you may have noticed that we did not specify a seed metric for OSPF. OSPF does not require a seed metric to be set during redistribution. You also noticed that the router did tell us that there might be a problem when we left the "subnets" option out of RIP>OSPF redistribution, but the router didn't tell us anything about a seed metric when we performed OSPF>RIP redistribution. This is a detail you must know by heart in order to make your route redistribution successful!
Network
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