All, Need some clarification, I made one of Marko's ospf articles into a bigger ospf domain, and this question came up--not sure if there is an answer already ...
Question: who selects ip address to use as Forward (FW) address the ASBR ? can this be influence manually... here is the link to the article : http://blog.ipexpert.com/2010/09/27/quick-look-into-ospf-database-nssa-external-lsa/ before i added a router(r6) to R1 ( using Serial interface) this how the external db looks like on R4: R4#sh ip os database nssa-external OSPF Router with ID (4.4.4.4) (Process ID 1) Type-7 AS External Link States (Area 145) LS age: 905 Options: (No TOS-capability, Type 7/5 translation, DC) LS Type: AS External Link Link State ID: 11.11.11.11 (External Network Number ) Advertising Router: 1.1.1.1 LS Seq Number: 80000002 Checksum: 0xBDF1 Length: 36 Network Mask: /32 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 145.145.145.1 External Route Tag: 0 After adding R6 to R1.... here is the DB on R4: R4#sh ip os database nssa-external OSPF Router with ID (4.4.4.4) (Process ID 1) Type-7 AS External Link States (Area 145) LS age: 3 Options: (No TOS-capability, Type 7/5 translation, DC) LS Type: AS External Link Link State ID: 11.11.11.11 (External Network Number ) Advertising Router: 1.1.1.1 LS Seq Number: 80000003 Checksum: 0x85AD Length: 36 Network Mask: /32 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 16.16.16.1 External Route Tag: 0 the FW add changed on R4 when i brought a link ( serial on R1 connecting to R6) configs: R4#sh run | s router router ospf 1 router-id 4.4.4.4 log-adjacency-changes area 145 nssa network 4.4.4.4 0.0.0.0 area 0 network 24.24.24.4 0.0.0.0 area 0 network 45.45.45.4 0.0.0.0 area 0 network 145.145.145.4 0.0.0.0 area 145 R1#sh run | s router router ospf 1 router-id 1.1.1.1 log-adjacency-changes area 145 nssa redistribute connected subnets route-map CON-to-OSPF network 16.16.16.1 0.0.0.0 area 145 network 145.145.145.1 0.0.0.0 area 145 ------------------------------------------------------------------------------ This electronic mail (including any attachments) may contain information that is privileged, confidential, and/or otherwise protected from disclosure to anyone other than its intended recipient(s). Any dissemination or use of this electronic email or its contents (including any attachments) by persons other than the intended recipient(s) is strictly prohibited. If you have received this message in error, please notify us immediately by reply email so that we may correct our internal records. Please then delete the original message (including any attachments) in its entirety. Thank you. _______________________________________________ Free CCIE R&S, Collaboration, Data Center, Wireless & Security Videos :: iPexpert on YouTube: www.youtube.com/ipexpertinc
