We will use below topology and different subnet at both end, then we will check the adjacency and try to ping in order to confirm.
R2 F0/0 <—–> F0/0 R3
R2 Configuration:
R2#sho run int f0/0
Building configuration...
Current configuration : 153 bytes
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 2001:2::2/64
ipv6 address FE80::2 link-local
ipv6 ospf 1 area 0
end
R3 Configuration:
R3#sho run int f0/0
Building configuration...
Current configuration : 153 bytes
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 2001:3::3/64
ipv6 address FE80::3 link-local
ipv6 ospf 1 area 0
end
Checking routes on R2:
R2#sho ipv6 ospf ne
Neighbor ID Pri State Dead Time Interface ID Interface
3.3.3.3 1 FULL/DR 00:00:35 4 FastEthernet0/0
R2#sho ipv6 route
IPv6 Routing Table - 5 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
C 2001:2::/64 [0/0]
via ::, FastEthernet0/0
L 2001:2::2/128 [0/0]
via ::, FastEthernet0/0
O 2001:3::/64 [110/10]
via ::, FastEthernet0/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
Trying to ping 2001:3::3 from R2:
R2#ping 2001:3::3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:3::3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/20/56 ms
R2#
Adjacency is establishing and able to ping because neighbors are known by their router-ids. Link-local addresses are used as next-hops, not actual interface address.
Thanks for reading the blog ………..