OSPF Virtual Link Part 2 (CCNP)
I took my previous simulation and expanded on it. In part 1, I used a virtual-link on iosv-3 and iosv-4 to connect Area 0 on both sides together.
This is part 2 of OSPF Virtual Link. I added Area 2 that is connected on the other side of Area 1.
For part 3, I will be changing the right side 4 outside routers to all 4 stub types.
iosv-3, iosv-4, iosv-7, iosv-8, iosv-11 and iosv-12 are ABR with virtual links. Area 34 to 37 are not directly connected to Area 0 like Area 2. iosv-7 is both and ABR and ASBR. In every simulation that has Flat-1 connected to an OSPF router makes that router an ASBR.
Loopback address on each router is 172.20.x.x and fd00:172:20:x::x/64 where iosv-x has x as the router number.
OSPF Router-id is 10.4.x.x for IPv4 with x as the router number
OSPF Router-id is 10.6.x.x for IPv6 with x as the router number
I added the 172.20 ranges for IPv4 and IPv6 to the 60E static route tables.
ABR and ASBR
iosv-7 Sh IP OSPF and Sh IPv6 OSPF showing ABR and ASBR
The four routers below will be changed to all four stub types in the part 3. In the four stub types: stub, totally stubby, NSSA, Totally NSSA certain rules apply:
1.) All four types of stub ABRs don’t flood type 5 external routes in the area.
2.) Only Stub and NSSA ABRs flood type 3 summary LSAs into the area.
3.) Only NSSA and Totally NSSA allow redistribution of External LSAs into stubby areas.