Lab 3 - Part 2 - Configuring IPv6 With OSPF

Submitted by Jason Neurohr on Mon, 08/03/2009 - 23:34

Continuing on from Part 1 of this lab, we'll now setup OSPF. To do this we will create some additional loopback interfaces with IPv6 addresses, we'll then setup OSPF to advertise these loopback interfaces to all the routers. As with Part 1 I'll only show the configuration on routers R0 and R1.

Network:

First we'll create the loopback interfaces:

R0(config)#interface loopback 1
R0(config-if)#ipv6 address 2001:0:0:20::/64 eui-64
R1(config)#interface loopback 1
R1(config-if)#ipv6 address 2001:0:0:21::/64 eui-64

Next we'll create an instance of OSPF on each router, this is fairly similar to the command you would use when setting up OSPF for IPv4. We will also set the router-id's:

R0(config)#ipv6 router ospf 1
R0(config-rtr)#router-id 10.10.10.10
R1(config)#ipv6 router ospf 1
R1(config-rtr)#router-id 1.1.1.1

Remember the router process instance number is locally significant. Next we'll configure the FastEthernet Interfaces and the Loopback Interfaces to be part of OSPF area 0:

R0(config)#interface fastethernet 0/0
R0(config-if)#ipv6 ospf 1 area 0
R0(config-if)#ipv6 ospf network broadcast
R0(config)#interface fastethernet 0/1
R0(config-if)#ipv6 ospf 1 area 0
R0(config-if)#ipv6 ospf network broadcast
R0(config-if)#interface loopback 1
R0(config-if)#ipv6 ospf 1 area 0
R1(config)#interface fastethernet 0/0
R1(config-if)#ipv6 ospf 1 area 0
R1(config-if)#ipv6 ospf network broadcast
R1(config)#interface fastethernet 0/1
R1(config-if)#ipv6 ospf 1 area 0
R1(config-if)#ipv6 ospf network broadcast
R1(config)#interface loopback 1
R1(config-if)#ipv6 ospf 1 area 0
*Mar  1 00:09:41.653: %OSPFv3-5-ADJCHG: Process 1, Nbr 1.1.1.1 on FastEthernet0/0 from LOADING to FULL, Loading Done
*Mar  1 00:09:42.130: %OSPFv3-5-ADJCHG: Process 1, Nbr 10.10.10.10 on FastEthernet0/0 from LOADING to FULL, Loading Done

You can now see the OSPF route in R0's routing table:

R0#show ipv6 route
IPv6 Routing Table - 10 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   2001:0:0:1::/64 [0/0]
     via ::, Loopback0
L   2001::1:CA00:1CFF:FE94:0/128 [0/0]
     via ::, Loopback0
R   2001:0:0:2::/64 [120/2]
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:3::/64 [120/3]
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:4::/64 [120/4]
     via FE80:1::2, FastEthernet0/0
C   2001:0:0:20::/64 [0/0]
     via ::, Loopback1
L   2001::20:CA00:1CFF:FE94:0/128 [0/0]
     via ::, Loopback1
O   2001::21:CA01:1CFF:FE94:0/128 [110/1]
     via FE80:1::2, FastEthernet0/0
L   FE80::/10 [0/0]
     via ::, Null0
L   FF00::/8 [0/0]
     via ::, Null0

We'll then test connectivity:

R0#ping 2001::21:CA01:1CFF:FE94:0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001::21:CA01:1CFF:FE94:0, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/9/24 ms

This is our routing table on R0, once all the routers are configured:

R0#show ipv6 route
IPv6 Routing Table - 12 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   2001:0:0:1::/64 [0/0]
     via ::, Loopback0
L   2001::1:CA00:1DFF:FE4E:0/128 [0/0]
     via ::, Loopback0
R   2001:0:0:2::/64 [120/2]
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:3::/64 [120/3]
     via FE80:2::2, FastEthernet0/1
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:4::/64 [120/2]
     via FE80:2::2, FastEthernet0/1
C   2001:0:0:20::/64 [0/0]
     via ::, Loopback1
L   2001::20:CA00:1DFF:FE4E:0/128 [0/0]
     via ::, Loopback1
O   2001::21:CA01:1DFF:FE4E:0/128 [110/1]
     via FE80:1::2, FastEthernet0/0
O   2001::22:CA02:1DFF:FE4E:0/128 [110/2]
     via FE80:1::2, FastEthernet0/0
     via FE80:2::2, FastEthernet0/1
O   2001::23:CA03:1DFF:FE4E:0/128 [110/1]
     via FE80:2::2, FastEthernet0/1
L   FE80::/10 [0/0]
     via ::, Null0
L   FF00::/8 [0/0]
     via ::, Null0

You'll notice two things with the routing table, the first being that OSPF has automatically added the equal cost routes to the 2001::22:CA02:1DFF:FE4E:0/128 network. Secondly is that all the OSPF routes are being advertised with a /128 bit mask. To get this working correctly we need to change the OSPF network type on the loopback interfaces:

R0(config)#interface loopback 1
R0(config-if)#ipv6 ospf network point-to-point
R1(config)#interface loopback 1
R1(config-if)#ipv6 ospf network point-to-point

Now that we've done that, we can see the routing table now has the routes with a 64 bit mask.

R0#show ipv6 route
IPv6 Routing Table - 12 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   2001:0:0:1::/64 [0/0]
     via ::, Loopback0
L   2001::1:CA00:1DFF:FE4E:0/128 [0/0]
     via ::, Loopback0
R   2001:0:0:2::/64 [120/2]
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:3::/64 [120/3]
     via FE80:2::2, FastEthernet0/1
     via FE80:1::2, FastEthernet0/0
R   2001:0:0:4::/64 [120/2]
     via FE80:2::2, FastEthernet0/1
C   2001:0:0:20::/64 [0/0]
     via ::, Loopback1
L   2001::20:CA00:1DFF:FE4E:0/128 [0/0]
     via ::, Loopback1
O   2001:0:0:21::/64 [110/2]
     via FE80:1::2, FastEthernet0/0
O   2001:0:0:22::/64 [110/3]
     via FE80:1::2, FastEthernet0/0
     via FE80:2::2, FastEthernet0/1
O   2001:0:0:23::/64 [110/2]
     via FE80:2::2, FastEthernet0/1
L   FE80::/10 [0/0]
     via ::, Null0
L   FF00::/8 [0/0]
     via ::, Null0

Some additional commands you can use for veiwing you setup, and troubleshooting.

You can view the OSPF Neighbors using the below command:

R0#show ipv6 ospf neighbor     

Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
3.3.3.3           1   FULL/BDR        00:00:37    4               FastEthernet0/1
1.1.1.1           1   FULL/BDR        00:00:37    4               FastEthernet0/0

The same command with the detail flag, will show you some additional information.

R0#show ipv6 ospf neighbor detail
 Neighbor 3.3.3.3
    In the area 0 via interface FastEthernet0/1
    Neighbor: interface-id 4, link-local address FE80:2::2
    Neighbor priority is 1, State is FULL, 6 state changes
    DR is 10.10.10.10 BDR is 3.3.3.3
    Options is 0x84B41E21
    Dead timer due in 00:00:34
    Neighbor is up for 00:04:35
    Index 1/1/1, 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
 Neighbor 1.1.1.1
    In the area 0 via interface FastEthernet0/0
    Neighbor: interface-id 4, link-local address FE80:1::2
    Neighbor priority is 1, State is FULL, 6 state changes
    DR is 10.10.10.10 BDR is 1.1.1.1
    Options is 0x856AB41D
    Dead timer due in 00:00:33
    Neighbor is up for 00:04:36
    Index 1/2/2, 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

View the OSPF database:

R0#show ipv6 ospf database

            OSPFv3 Router with ID (10.10.10.10) (Process ID 1)

        Router Link States (Area 0)

ADV Router      Age         Seq#        Fragment ID  Link count  Bits
1.1.1.1         351         0x80000004  0            2           None
2.2.2.2         353         0x80000003  0            2           None
3.3.3.3         351         0x80000004  0            2           None
10.10.10.10     351         0x80000004  0            2           None

        Net Link States (Area 0)

ADV Router      Age         Seq#        Link ID    Rtr count
2.2.2.2         363         0x80000001  4          2
3.3.3.3         363         0x80000001  5          2
10.10.10.10     356         0x80000001  4          2
10.10.10.10     355         0x80000001  5          2

        Link (Type-8) Link States (Area 0)

ADV Router      Age         Seq#        Link ID    Interface
3.3.3.3         401         0x80000001  4          Fa0/1
10.10.10.10     401         0x80000001  5          Fa0/1
1.1.1.1         402         0x80000001  4          Fa0/0
10.10.10.10     402         0x80000001  4          Fa0/0
10.10.10.10     402         0x80000001  8          Lo1

        Intra Area Prefix Link States (Area 0)

ADV Router      Age         Seq#        Link ID    Ref-lstype  Ref-LSID
1.1.1.1         403         0x80000001  0          0x2001      0
2.2.2.2         403         0x80000001  0          0x2001      0
3.3.3.3         404         0x80000001  0          0x2001      0
10.10.10.10     402         0x80000001  0          0x2001      0

Show ipv6 ospf area will show you some additional information.

R0#show ipv6 ospf 1
 Routing Process "ospfv3 1" with ID 10.10.10.10
 SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
 Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x000000
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
    Area BACKBONE(0)
    Number of interfaces in this area is 3
    SPF algorithm executed 3 times
    Number of LSA 17. Checksum Sum 0x074E36
    Number of DCbitless LSA 0
    Number of indication LSA 0
    Number of DoNotAge LSA 0
    Flood list length 0

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Lab 3 - Part 2 - Configuring IPv6 With OSPF

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