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  • AtricleZine - Cisco CCNP / BSCI Certification: Route Redistribution And The Seed Metric

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    netted, 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

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    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.

    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)#int loopback33

    R3(config-if)#ip address 33.3.3.3 255.255.255.255

    R3(config-if)#int loopback34

    R3(config-if)#ip address 34.3.3.3 255.255.255.255

    R3(config-if)#int loopback35

    R3(config-if)#ip address 35.3.3.3 255.255.255.255

    R3(config-if)#router ospf 1

    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.

    R1#show ip route ospf

    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

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    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)#int loopback33

    R3(config-if)#ip address 33.3.3.3 255.255.255.255

    R3(config-if)#int loopback34

    R3(config-if)#ip address 34.3.3.3 255.255.255.255

    R3(config-if)#int loopback35

    R3(config-if)#ip address 35.3.3.3 255.255.255.255

    R3(config-if)#router ospf 1

    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.

    R1#show ip route ospf

    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

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    opbacks to R3 and advertise them to R1 via OSPF.

    R3(config)#int loopback33

    R3(config-if)#ip address 33.3.3.3 255.255.255.255

    R3(config-if)#int loopback34

    R3(config-if)#ip address 34.3.3.3 255.255.255.255

    R3(config-if)#int loopback35

    R3(config-if)#ip address 35.3.3.3 255.255.255.255

    R3(config-if)#router ospf 1

    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.

    R1#show ip route ospf

    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

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    5

    R3(config-if)#router ospf 1

    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.

    R1#show ip route ospf

    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

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    netted, 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 rip

    R1(config-router)#redistribute ospf 1 ?

    match Redistribution of OSPF routes

    metric Metric for redistributed routes

    route-map Route map reference

    vrf VPN Routing/Forwarding Instance

    R1(config-router)#redistribute ospf 1

    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.

    R5#show ip route rip

    R5#

    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?

    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 an

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