Subject: [OSPF] Forwarding address in Type-7 LSA

From: Thiruma valavan <[email-masked]>
Date: Fri, 29 Mar 2013 00:28:00 +0530

Hi All,
I had a doubt in forwarding address field in Type-7 LSA.
what would be the forwarding address for below scenarios.
R1 ---Area0-----R2(10.0.0.1/8)-------Area1 NSSA----------(10.0.0.2/8) R3(20.0.0.1)---------------(20.0.0..2/8)R4(loopback0 - 100.0.0.1/32)
Static route configured in R3 "ip route 100.0.0.0 255.255.255.255 20.0.0.2"
1.What would be forwarding address, when the  nexthop  interface of 100.0.0.0/32 network is not added into OSPF NSSA Area-1 ?2.What would be forwarding address, when the  nexthop  interface of 100.0.0.0/32 network is added into OSPF NSSA Area-1  through network command and the interface is not passive ?3.What would be forwarding address, when the  nexthop interface of 100.0.0.0/32 network is added into OSPF NSSA Area-1  through network command and the interface is not passive ? I have seen three different address in above scenarios. Please help me to understand this. 
Thanks & Regards,Thirumavalavan P