To configure IPv6 OSPF version 3 (OSPFv3) routing protocol, IPv6 addressing and unicast-routing must be already configured on the network devices. For our example configuration, we have two routers, R1 and R2, and we’ll configure OSPFv3 routing between them.
IPv6 OSPFv3 Configuration
Again, first thing, we have to configure unicast-routing on R1 and R2 so that routing protocols will work for IPv6.
R1(config)#ipv6 unicast-routing R2(config)#ipv6 unicast-routing
Next, we’ll set the IPv6 loopback addresses.
R1(config)#interface loopback 0 R1(config-if)#ipv6 address 2001::1/128 R2(config)#interface loopback 0 R2(config-if)#ipv6 address 2001::2/128
Then, we have to enable IPv6 on our interfaces and configure their IPv6 addresses as well.
R1(config)#interface G0/0/0 R1(config-if)#ipv6 enable R1(config-if)#ipv6 address 2001:db8:0:20::1/64 R1(config)#int G0/0/1 R1(config-if)#ipv6 enable R1(config-if)#ipv6 address 2001:db8:0:10::1/64
R2(config)#interface G0/0/0 R2(config-if)#ipv6 enable R2(config-if)#ipv6 address 2001:db8:0:20::2/64 R2(config)#interface G0/0/1 R2(config-if)#ipv6 enable R2(config-if)#ipv6 address 2001:db8:0:30::1/64
So that’s our basic configuration done. Now let’s enable OSPFv3 on our routers using the ‘ipv6 router ospfv3 <process-id>’ command at the global configuration mode. We also have to assign a router ID for the OSPF routing process if there are no IPv4 addresses configured on the router. The command to do this is ‘router-id <router-id>’, and it is entered under the OSPF router configuration mode. The router ID resembles an IPv4 address and it can have any value as long as it is unique within the OSPF domain.
R1(config)#ipv6 router ospf 1 R1(config-rtr)#router-id 1.1.1.1 R1(config-rtr)#exit
R2(config)#ipv6 router ospf 1 R2(config-rtr)#router-id 2.2.2.2 R2(config-rtr)#exit
Finally, we have to assign our interfaces to their corresponding OSPFv3 areas. Under the interface configuration mode, enter the command ‘ipv6 ospf <process id> area <area number>’. For our example, we will assign all interfaces into area 0.
R1(config)#interface range G0/0/0-1 R1(config-if)#ipv6 ospf 1 area 0 R1(config)#interface loopback 0 R1(config-if)#ipv6 ospf 1 area 0
R2(config)#interface range G0/0/0-1 R2(config-if)#ipv6 ospf 1 area 0 R2(config)#interface loopback 0 R2(config-if)#ipv6 ospf 1 area 0
IPv6 OSPFv3 Verification
To check the IPv6 addresses on the router, we can use the ‘show ipv6 interface brief’ command.
R1#show ipv6 interface brief GigabitEthernet0/0/0 [up/up] FE80::5054:FF:FE0F:F10A 2001:DB8:0:20::1 GigabitEthernet0/0/1 [up/up] FE80::5054:FF:FE0B:CEFB 2001:DB8:0:10::1 GigabitEthernet0/0/2 [administratively down/down] unassigned GigabitEthernet0/0/3 [administratively down/down] unassigned Loopback0 [up/up] FE80::5054:FF:FE0F:F10A 2001::1
To view the OSPFv3 neighbor, we can use the command ‘show ipv6 ospf neighbor‘.
R1#show ipv6 ospf neighbor OSPFv3 Router with ID (1.1.1.1) (Process ID 1) Neighbor ID Pri State Dead Time Interface ID Interface 2.2.2.2 1 FULL/DR 00:00:38 2 GigabitEthernet0/0
R2#show ipv6 ospf neighbor OSPFv3 Router with ID (2.2.2.2) (Process ID 1) Neighbor ID Pri State Dead Time Interface ID Interface 1.1.1.1 1 FULL/BDR 00:00:38 2 GigabitEthernet0/0
We can also have a detailed view of the OSPFv3 interface configurations using the ‘show ospfv3 interface’ command.
R1#show ospfv3 interface Loopback0 is up, line protocol is up Link Local Address FE80::5054:FF:FE0F:F10A, Interface ID 9 Area 0, Process ID 1, Instance ID 0, Router ID 1.1.1.1 Network Type LOOPBACK, Cost: 1 Loopback interface is treated as a stub Host GigabitEthernet0/1 is up, line protocol is up Link Local Address FE80::5054:FF:FE0B:CEFB, Interface ID 3 Area 0, Process ID 1, Instance ID 0, Router ID 1.1.1.1 Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 1.1.1.1, local address FE80::5054:FF:FE0B:CEFB No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:00 Graceful restart helper support enabled Index 1/2/2, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 0, maximum is 0 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 0, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) GigabitEthernet0/0 is up, line protocol is up Link Local Address FE80::5054:FF:FE0F:F10A, Interface ID 2 Area 0, Process ID 1, Instance ID 0, Router ID 1.1.1.1 Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State BDR, Priority 1 Designated Router (ID) 2.2.2.2, local address FE80::5054:FF:FE10:8031 Backup Designated router (ID) 1.1.1.1, local address FE80::5054:FF:FE0F:F10A Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:07 Graceful restart helper support enabled Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 1, maximum is 2 Last flood scan time is 0 msec, maximum is 1 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 2.2.2.2 (Designated Router) Suppress hello for 0 neighbor(s)
The command ‘show ipv6 route ospf’ shows the OSPFv3 IPv6 routing table.
R1#show ipv6 route ospf IPv6 Routing Table - default - 8 entries Codes: C - Connected, L - Local, S - Static, U - Per-user Static route B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect RL - RPL, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1 OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 la - LISP alt, lr - LISP site-registrations, ld - LISP dyn-eid lA - LISP away, a - Application O 2001::2/128 [110/1] via FE80::5054:FF:FE10:8031, GigabitEthernet0/0 O 2001:DB8:0:30::/64 [110/2] via FE80::5054:FF:FE10:8031, GigabitEthernet0/0
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