This simulation is for OSPF using a virtual link to commect two Area 0 together. I have it created for IPv4 and IPv6. You use Router OSPF and IPv6 Router OSPF configurations. The command
Area # virtual-link Router-idto the other router creates the bridge. This simulation goes across Area 1 to create the virtual link. Router-id 10.4.x.x is for OSPF iPv4 for x (iosv-x). Router-id 10.6.x.x is for IPv6 Router OSPF. This will show you the OSPF traffic on both IPv4 and IPv6.
Flat-1 allows my simulations out to the TFTP IPv6 Ubuntu server. I added routes to redirect TFTP commands.
sh run | redirect tftp://[fd00:192:168:1::5]/iosv1_ShRunBeforeVL.txt
This simulation has two OSPF area 0 that are not connected. It could be from two companies merging. The virtual link allows a connection on ABRs across another area to allow OSPF communication between the two Area 0 routers.
This will show you the Sh IP OSPF databases before and after.
I will start with showing you the iosv-3 and iosv-4 before and after Sh IP OSPF Database and Sh IPv6 OSPF Database.
On the the left iosv-1 and iosv-2 are in one OSPF area 0. On the right iosv-5 and iosv-6 are in the other Area 0. In the beforeVL versions, you will not see them cross over and talk. the ABRs are isov-3 and iosv-4.