SRG

SCSIraidGURU’s World

OSPF Virtual Link Part 3 (CCNP)

In part 2, Area 2 and virtual links were added to allow it into Area 0.   I also setup the right side routers to show what they look like before the four stub types were added.  At the bottom of the page are the database-summary entries for the four stub areas. 

 

Area 34: Stub

Area 35: Totally Stubby

Area 36: NSSA

Area 37: Totally NSSA

 

The sh ip route commands in part 3 no longer have all the entries that part 2 had before the commands were issued.  Compare iosv-13 and iosv-14.  iosv-14 has no-summary added to the ABR.    You will see the same comparing iosv-15 and iosv-16.

Cisco Virtual Lab zip file

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.

iosv-3

iosv-7

iosv-4

ABR

ABR and ASBR

ABR

iosv-7 Sh IP OSPF and Sh IPv6 OSPF showing ABR and ASBR

iosv-8

iosv-11

iosv-12

ABR

ABR

ABR

iosv-1

iosv-2

iosv-5

iosv-6

iosv-9

iosv-10

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.

 

iosv-13

iosv-14

iosv-15

iosv-16

Sh IP OSPF Database Database-summary and Sh IPv6 OSPF Database Database-summary

iosv-11

iosv-12

iosv-13

iosv-14

iosv-15

iosv-16