IPv6 OSPF Virtual-Link

Router R4's Fa0/0 interface is OSPF area 54 and can not learning R1's loopback 1 address FEC0:1::1/64 , Please configure the OSPF virtual link to fix this issue.

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R1#sh run
!
hostname R1
!
ipv6 unicast-routing
!
interface Loopback1
 no ip address
 ipv6 address FEC0:1::1/64
 ipv6 ospf 1 area 0
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 12::1/64
 ipv6 ospf 1 area 0
!       
logging alarm informational
ipv6 router ospf 1
 router-id 1.1.1.1
!
R1#
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R2#sh run
!
hostname R2
!
ipv6 unicast-routing
!
interface Loopback1
 no ip address
 ipv6 address FEC0:2::2/64
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 12::2/64
 ipv6 ospf 1 area 0
!
interface Serial1/0
 no ip address
 ipv6 address 23::2/64
 ipv6 ospf 1 area 11
 no fair-queue
 serial restart-delay 0
!

!       
logging alarm informational
ipv6 router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
 area 11 virtual-link 3.3.3.3
!
R2#
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R3#sh run
!
ipv6 unicast-routing
!
interface Loopback1
 no ip address
 ipv6 address FEC0:3::3/64
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 34::3/64
 ipv6 ospf 1 area 54
!
interface Serial1/0
 no ip address
 ipv6 address 23::3/64
 ipv6 ospf 1 area 11
 no fair-queue
 serial restart-delay 0
!       
logging alarm informational
ipv6 router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 area 11 virtual-link 2.2.2.2
!
R3#
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R4#sh run
!
ipv6 unicast-routing
!
interface Loopback1
 no ip address
 ipv6 address FEC0:4::4/64
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 34::4/64
 ipv6 ospf 1 area 54
!
logging alarm informational
ipv6 router ospf 1
 router-id 4.4.4.4
 log-adjacency-changes
!
R4#
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R4#sh ipv6 route
IPv6 Routing Table - 10 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route, M - MIPv6
       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
       D - EIGRP, EX - EIGRP external
OI  12::/64 [110/66]
     via FE80::C803:3FF:FE7F:8, FastEthernet0/0
OI  23::/64 [110/65]
     via FE80::C803:3FF:FE7F:8, FastEthernet0/0
OI  23::2/128 [110/65]
     via FE80::C803:3FF:FE7F:8, FastEthernet0/0
OI  23::3/128 [110/1]
     via FE80::C803:3FF:FE7F:8, FastEthernet0/0
C   34::/64 [0/0]
     via ::, FastEthernet0/0
L   34::4/128 [0/0]
     via ::, FastEthernet0/0
OI  FEC0:1::1/128 [110/66]
     via FE80::C803:3FF:FE7F:8, FastEthernet0/0
C   FEC0:4::/64 [0/0]
     via ::, Loopback1
L   FEC0:4::4/128 [0/0]
     via ::, Loopback1
L   FF00::/8 [0/0]
     via ::, Null0
R4#
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R2#show ipv6 ospf virtual-links
Virtual Link OSPFv3_VL0 to router 3.3.3.3 is up
  Interface ID 15, IPv6 address 23::3
  Run as demand circuit
  DoNotAge LSA allowed.
  Transit area 11, via interface Serial1/0, Cost of using 64
  Transmit Delay is 1 sec, State POINT_TO_POINT,
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    Adjacency State FULL (Hello suppressed)
    Index 1/2/3, retransmission queue length 0, number of retransmission 0
    First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
    Last retransmission scan length is 0, maximum is 0
    Last retransmission scan time is 0 msec, maximum is 0 msec
R2#

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