Configuring OSPFv3

Just as with the RIPng configuration, all we have to do to enable OSPF on the internetwork is to go to each interface that we want to run it.

Here is the Corp configuration:

Corp#config t
Corp(config)#int f0/1
Corp(config-if)#ipv6 ospf 1 ?
area Set the OSPF area ID
Corp(config-if)#ipv6 ospf 1 area 0
Corp(config-if)#int s0/0/1
Corp(config-if)#ipv6 ospf 1 area 0
Corp(config-if)#int s0/1/0
Corp(config-if)#ipv6 ospf 1 area 0
Corp(config-if)#int s0/2/0
Corp(config-if)#ipv6 ospf 1 area 0
Corp(config-if)#^Z
Corp#

That wasn’t so bad—actually somewhat easier than with IPv4. Let’s configure the other three routers:

R1#config t
R1(config)#int s0/0/1
R1(config-if)#ipv6 ospf 1 area 0
R1(config-if)#
*May 24 19:24:55.279: %OSPFv3-5-ADJCHG: Process 1, Nbr 172.16.10.2 on
Serial0/0/1 from LOADING to FULL, Loading Done

Sweet! R1 has become adjacent to the Corp router. One interesting output line is that the IPv4 RID is being used in the OSPFv3 adjacent change.

R2#config t
R2(config)#int s0/2/0
R2(config-if)#ipv6 ospf 1 area 0
R2(config-if)#
*May 24 19:27:31.399: %OSPFv3-5-ADJCHG: Process 1, Nbr 172.16.10.3 on
Serial0/1/0 from LOADING to FULL, Loading Done

Again, our adjacency popped up—this is great. One more router, then we’ll do some verification:

R3#config t
R3(config)#int s0/0/1
R3(config-if)#ipv6 ospf 1 area 0
R3(config-if)#
*May 24 19:29:07.231: %OSPFv3-5-ADJCHG: Process 1, Nbr 172.16.10.4 on
Serial0/2/0 from LOADING to FULL, Loading Done

Without even verifying our network, it seems to me that it’s up and running. But, we’ve still got to verify!

Verifying OSPFv3

I’ll start as usual with the show ipv6 route command:

R3#sh ipv6 route
IPv6 Routing Table - 7 entries
O   2001:DB8:3C4D:11::/64 [110/65]
via FE80::21A:2FFF:FE55:C9E8, Serial0/0/1
O   2001:DB8:3C4D:13::/64 [110/128]
via FE80::21A:2FFF:FE55:C9E8, Serial0/0/1
O   2001:DB8:3C4D:14::/64 [110/128]
via FE80::21A:2FFF:FE55:C9E8, Serial0/0/1
C   2001:DB8:3C4D:15::/64 [0/0]
via ::, Serial0/0/1
L   2001:DB8:3C4D:15:21A:6DFF:FE37:A44E/128 [0/0]
via ::, Serial0/0/1
L   FE80::/10 [0/0]
via ::, Null0
L   FF00::/8 [0/0]
via ::, Null0
R3#

Perfect. I see all the subnets (except 12, which is down because of that bad interface). Let’s take a look at the show ipv6 protocols command:

R3#sh ipv6 protocols
IPv6 Routing Protocol is “connected”
IPv6 Routing Protocol is “static”
IPv6 Routing Protocol is “rip 1”
Interfaces:
Serial0/0/1
Redistribution:
None
IPv6 Routing Protocol is “ospf 1”
Interfaces (Area 0):
Serial0/0/1
Redistribution:
None

For the next command, I want to go back to the Corp router so can I see more connections: show ipv6 ospf neighbor.

Corp#sh ipv6 ospf neighbor
Neighbor ID Pri State Dead Time Interface ID Interface
172.16.10.4 1 FULL/ - 00:00:36 6 Serial0/2/0
172.16.10.3 1 FULL/ - 00:00:33 16 Serial0/1/0
172.16.10.2 1 FULL/ - 00:00:30 6 Serial0/0/1
Corp#

Wait! We need to do our debugging commands. I’ll use two of them: debug ipv6 ospf packet and debug ipv6 ospf hello (almost the same commands I used with IPv4):

Corp#debug ipv6 ospf packet
OSPFv3 packet debugging is on

Corp#
*May 24 19:38:12.283: OSPFv3: rcv. v:3 t:1 l:40 rid:172.16.10.3
aid:0.0.0.0 chk:E1D2 inst:0 from Serial0/1/0
Corp#
*May 24 19:38:15.103: OSPFv3: rcv. v:3 t:1 l:40 rid:172.16.10.4
aid:0.0.0.0 chk:7EBB inst:0 from Serial0/2/0
Corp#
*May 24 19:38:18.875: OSPFv3: rcv. v:3 t:1 l:40 rid:172.16.10.2
aid:0.0.0.0 chk:192D inst:0 from Serial0/0/1
Corp#
*May 24 19:38:22.283: OSPFv3: rcv. v:3 t:1 l:40 rid:172.16.10.3
aid:0.0.0.0 chk:E1D2 inst:0 from Serial0/1/0
Corp#un all
All possible debugging has been turned off
Corp#debug ipv6 ospf hello
OSPFv3 hello events debugging is on
Corp#
*May 24 19:38:32.283: OSPFv3: Rcv hello from 172.16.10.3 area 0 from
Serial0/1/0 FE80::213:60FF:FE20:4E4C interface ID 16
*May 24 19:38:32.283: OSPFv3: End of hello processing
Corp#
*May 24 19:38:35.103: OSPFv3: Rcv hello from 172.16.10.4 area 0 from
Serial0/2/0 FE80::21A:6DFF:FE37:A44E interface ID 6
*May 24 19:38:35.103: OSPFv3: End of hello processing
Corp#
*May 24 19:38:38.875: OSPFv3: Rcv hello from 172.16.10.2 area 0 from
Serial0/0/1 FE80::21A:6DFF:FE64:9B2 interface ID 6
*May 24 19:38:38.875: OSPFv3: End of hello processing
Corp#un all
All possible debugging has been turned off
Corp#

The best thing you can do to learn IPv6 is to nick some routers and just have a go at it!