IPv6 Redistribution between RIPNG and OSPFv3

Redistribution for IPv6 is pretty much the same as for IPv4, the same rules apply. I want to show you an example of IPv6 redistribution between RIPNG and OSPFv3. Here’s the topology that we will use:

ipv6 redistribution ripng ospfv3

In the middle we have router R2 that will perform the redistribution between RIPNG and OSPFv3. R1 and R3 have a loopback interface that will be advertised.

R1(config)#ipv6 unicast-routing 
R1(config)#interface loopback 0
R1(config-if)#ipv6 address 2001::1/128
R1(config-if)#exit
R1(config)#interface fastEthernet 0/0
R1(config-if)#ipv6 enable
R2(config)#ipv6 unicast-routing 
R2(config)#interface fastEthernet 0/0
R2(config-if)#ipv6 enable 
R2(config-if)#exit
R2(config)#interface fastEthernet 1/0
R2(config-if)#ipv6 enable
R3(config)#ipv6 unicast-routing 
R3(config)#interface loopback 0
R3(config-if)#ipv6 address 2001::3/128
R3(config-if)#exit
R3(config)#interface fastEthernet 0/0
R3(config-if)#ipv6 enable

This is what we’ll start with. I’m using the loopbacks to have something to advertise in RIPNG or OSPFv3. On the FastEthernet interfaces I only need a link-local IPv6 address.

R2(config)#ipv6 router rip RIPNG
R2(config-rtr)#exit 
R2(config)#interface fastEthernet 0/0
R2(config-if)#ipv6 rip RIPNG enable
R1(config)#ipv6 router rip RIPNG
R1(config-rtr)#exit
R1(config)#interface loopback 0
R1(config-if)#ipv6 rip RIPNG enable 
R1(config-if)#exit
R1(config)#interface fastEthernet 0/0
R1(config-if)#ipv6 rip RIPNG enable 

I’m configuring RIPNG on R2 and R1 to get things going.

R3(config)#ipv6 router ospf 1
R3(config-rtr)#router-id 3.3.3.3
R3(config-rtr)#exit
R3(config)#interface fastEthernet 0/0
R3(config-if)#ipv6 ospf 1 area 0
R3(config-if)#interface loopback 0
R3(config-if)#ipv6 ospf 1 area 0  
R2(config)#ipv6 router ospf 1
R2(config-rtr)#router-id 2.2.2.2
R2(config-rtr)#exit 
R2(config)#interface fastEthernet 1/0
R2(config-if)#ipv6 ospf 1 area 0

And this is what we need on R3 and R2 to get OSPFv3 working.

R2(config)#ipv6 router ospf 1
R2(config-rtr)#redistribute rip RIPNG
R2(config-rtr)#exit
R2(config)#ipv6 router rip RIPNG
R2(config-rtr)#redistribute ospf 1 metric 1

We use the redistribute command to exchange routing information between OSPFv3 and RIPNG. This is all you have to do to redistribute everything.

R1#show ipv6 route rip
IPv6 Routing Table - 4 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
R   2001::3/128 [120/2]
     via FE80::CE04:19FF:FE67:0, FastEthernet0/0
R3#show ipv6 route ospf 
IPv6 Routing Table - 4 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
OE2  2001::1/128 [110/20]
     via FE80::CE04:19FF:FE67:10, FastEthernet0/0

We can verify our configuration by looking at the routing tables. If you want you can be a bit more specific with redistribution using route-maps:

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Forum Replies

  1. Thanks for the labs. It is very usefull.
    I have a suggestion for the last rule in route-map config:
    Cryo(config-route-map)#match ipv6 address prefix-list MYPREFIXES (instead of “ONLYTHESE”)

  2. Do we not need Seed metric while ipv6 redistribution …for RIPNG and EIGRP… i guess OSPF can calculate the cost automatically and will use 20.

  3. A suggestion…

    It will be easy to follow if you use router name R1 R2 R3 instead of names.

  4. Hi Suneeth,

    I agree, this is one of my older posts. In all my recent posts I use numbers instead of names.

    Rene

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