Configure Virtual Link and Route Summarization

Language:

Enter Global Configuration mode in SEFOS1.
```
SEFOS# configure terminal
```

Enable OSPF globally in SEFOS1.
```
SEFOS(config)# ipv6 router ospf
```

Configure the OSPF router ID.

SEFOS(config-router)# router-id 10.0.0.1

Exit Router Configuration mode.
```
SEFOS(config-router)# end
```

Enter Global Configuration mode in SEFOS4.
```
SEFOS# configure terminal
```

Enable OSPF globally in SEFOS4.
```
SEFOS(config)# ipv6 router ospf
```

Configure the OSPF router ID.

SEFOS(config-router)# router-id 10.0.0.4

Configure the virtual link for backbone connectivity.

SEFOS(config-router)# area 0.0.0.3 virtual-link 10.0.0.6 100
SEFOS(config-router)# area 0.0.0.3 virtual-link 10.0.0.5 120

Exit Router Configuration mode.
```
SEFOS(config-router)# end
```

Enter Global Configuration mode in SEFOS5.
```
SEFOS# configure terminal
```

Enable OSPF globally in SEFOS5.
```
SEFOS(config)# ipv6 router ospf
```

Configure the OSPF router ID.

SEFOS(config-router)# router-id 10.0.0.5

Configure the virtual link for backbone connectivity.

SEFOS(config-router)# area 0.0.0.3 virtual-link 10.0.0.4 120

Exit Router Configuration mode.
```
SEFOS(config-router)# end
```

Enter Global Configuration mode in SEFOS6.
```
SEFOS# configure terminal
```

Enable OSPF globally in SEFOS6.
```
SEFOS(config)# ipv6 router ospf
```

Configure the OSPF router ID.

SEFOS(config-router)# router-id 10.0.0.6

Configure the virtual link for backbone connectivity.

SEFOS(config-router)# area 0.0.0.3 virtual-link 10.0.0.4 100

Exit Router Configuration mode.
```
SEFOS(config-router)# end
```

Enter Global Configuration mode in SEFOS8.
```
SEFOS# configure terminal
```

Enable OSPF globally in SEFOS8.
```
SEFOS(config)# ipv6 router ospf
```

Configure the OSPF router ID.

SEFOS(config-router)# router-id 10.0.0.8

Exit configuration mode.
```
SEFOS(config-router)# end
```

View the route summarization information in SEFOS1.

SEFOS# show ipv6 ospf area-range
 
Ospfv3  Summary Address Configuration Information
 
Network                 PfxLength  LSA Type  Area        Effect         Tag
fec0::1111:0:0              96     Summary   0.0.0.0     advertise      0
fec0::2856:0:0              96     Summary   0.0.0.6     advertise      0

View the virtual link and the status of the link in SEFOS4.

SEFOS# show ipv6 ospf virtual-links
 
Interface State: PointToPoint, Neighbor State: FULL
Transit Area: 0.0.0.3,  Virtual Neighbor: 10.0.0.5
Intervals Configured for the Virtual Interface:
Hello: 10, Dead: 60, Transit: 1, Retransmit : 5
 
Interface State: PointToPoint, Neighbor State: FULL
Transit Area: 0.0.0.3,  Virtual Neighbor: 10.0.0.6
Intervals Configured for the Virtual Interface:
Hello: 10, Dead: 60, Transit: 1, Retransmit : 5

View the virtual link in SEFOS5.

SEFOS# show ipv6 ospf virtual-links
 
Interface State: PointToPoint, Neighbor State: FULL
Transit Area: 0.0.0.3,  Virtual Neighbor: 10.0.0.4
Intervals Configured for the Virtual Interface:
Hello: 10, Dead: 60, Transit: 1, Retransmit : 5

View the virtual link in SEFOS6.

SEFOS# show ipv6 ospf virtual-links
 
Interface State: PointToPoint, Neighbor State: FULL
Transit Area: 0.0.0.3,  Virtual Neighbor: 10.0.0.4
Intervals Configured for the Virtual Interface:
Hello: 10, Dead: 60, Transit: 1, Retransmit : 5

View the route available to reach ABR SEFOS1.

SEFOS# show ipv6 ospf border-routers
 
Ospfv3 Process Border Router Information
 
Destination    Type              NextHop        Cost    Rt Type     Area Id
10.0.0.1 	   ABR ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff0         0.0.0.0
10.0.0.4       ABR    fe80::207:2ff:fe03:401      1     intraArea   0.0.0.3
10.0.0.5       ABR    fe80::207:2ff:fe03:401      2     intraArea   0.0.0.3