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  • Add You - Cisco CCNP / BSCI Certification: Troubleshooting Route Redistribution, Part I

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    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output

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    If there's one CCNP / BSCI topic that looks so easy but can lead to a real headache, it's route redistribution. I'm not even talking about the routing loops and suboptimal routing that can result when route redistribution is done without proper planning - I'm talking about the basic commands themselves. Leaving out one single command option, or forgetting what else needs to be redistributed when redistributing dynamically discovered routes, can leave you with a routing table that looks complete but does not result in full IP connectivity.

    In this free CCNP / BSCI tutorial series, we'll take a look at three common errors in route redistribution configurations, and how to fix them. We'll use three routers, R1, R3, and R5. R1 and R5 are in a RIPv2 domain and R1 and R3 are in an OSPF domain. R1 will be performing two-way route redistribution.

    R5 is advertising its loopback, 5.5.5.5/24, into the RIPv2 domain. R1 sees this route in its RIP routing table:

    R1#show ip route rip

    5.0.0.0/24 is subnetted, 1 subnets

    R 5.5.5.0 [120/1] via 100.1.1.5, 00:00:01, Ethernet0

    For R3 to see this route, route redistribution must be configured on R1. We'll use the redistribute rip command to do so.

    R1(config)#router ospf 1

    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output

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    one single command option, or forgetting what else needs to be redistributed when redistributing dynamically discovered routes, can leave you with a routing table that looks complete but does not result in full IP connectivity.

    In this free CCNP / BSCI tutorial series, we'll take a look at three common errors in route redistribution configurations, and how to fix them. We'll use three routers, R1, R3, and R5. R1 and R5 are in a RIPv2 domain and R1 and R3 are in an OSPF domain. R1 will be performing two-way route redistribution.

    R5 is advertising its loopback, 5.5.5.5/24, into the RIPv2 domain. R1 sees this route in its RIP routing table:

    R1#show ip route rip

    5.0.0.0/24 is subnetted, 1 subnets

    R 5.5.5.0 [120/1] via 100.1.1.5, 00:00:01, Ethernet0

    For R3 to see this route, route redistribution must be configured on R1. We'll use the redistribute rip command to do so.

    R1(config)#router ospf 1

    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output

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    route redistribution configurations, and how to fix them. We'll use three routers, R1, R3, and R5. R1 and R5 are in a RIPv2 domain and R1 and R3 are in an OSPF domain. R1 will be performing two-way route redistribution.

    R5 is advertising its loopback, 5.5.5.5/24, into the RIPv2 domain. R1 sees this route in its RIP routing table:

    R1#show ip route rip

    5.0.0.0/24 is subnetted, 1 subnets

    R 5.5.5.0 [120/1] via 100.1.1.5, 00:00:01, Ethernet0

    For R3 to see this route, route redistribution must be configured on R1. We'll use the redistribute rip command to do so.

    R1(config)#router ospf 1

    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output

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    s RIP routing table:

    R1#show ip route rip

    5.0.0.0/24 is subnetted, 1 subnets

    R 5.5.5.0 [120/1] via 100.1.1.5, 00:00:01, Ethernet0

    For R3 to see this route, route redistribution must be configured on R1. We'll use the redistribute rip command to do so.

    R1(config)#router ospf 1

    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output

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    R1(config-router)#redistribute rip

    % Only classful networks will be redistributed

    The router immediately gives us a message that "only classful networks will be redistributed". What does this mean? Let's go to R3 and see if that router is receiving this route.

    R3#show ip route ospf

    < no output >

    When we get no result from a show command, that means there's nothing to show. The only routes that will be successfully redistributed with the current configuration on R1 are classful networks, and 5.5.5.0/24 is a subnet.

    To further illustrate the point, a classful network has been added to R5. This network is 16.0.0.0 /8, and is now being advertised by RIP. R1 sees this network as classful...

    R1#show ip route rip

    R 16.0.0.0/8 [120/1] via 100.1.1.5, 00:00:00, Ethernet0

    5.0.0.0/24 is subnetted, 1 subnets

    R 5.5.5.0 [120/1] via 100.1.1.5, 00:00:00, Ethernet0

    ... and R3 is receiving the route through redistribution.

    R3#show ip route ospf

    O E2 16.0.0.0/8 [110/20] via 172.12.123.1, 00:00:08, Serial0.31

    To redistribute both classful and classless networks, the option "subnets" must be added to the redistribute command on R1.

    R1(config)#router ospf 1

    R1(config-router)#no redistribute rip

    R1(config-router)#redistribute rip subnets

    R3 will now see both the classful and classless networks being redistributed into OSPF. (100.1.1.0 is the network connecting R1 and R5.)

    R3#show ip route ospf

    O E2 16.0.0.0/8 [110/20] via 172.12.123.1, 00:00:20, Serial0.31

    100.

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