Again , If Router C is connected to Area A and Area B and not to Area0 than it is Internal Router to Area A and to Area B on different Interfaces ....... So in simple it is Internal Router ...... Regards, -----Original Message----- From: owner-ietf@ietf.org [mailto:owner-ietf@ietf.org]On Behalf Of Durrani, Muhammad Sent: April 24, 2002 10:21 AM To: 'lwei@cpmail.cyberpathinc.com'; 'PLACID,JOSEPH (Non-A-India,ex1)'; 'ietf@ietf.org' Subject: RE: OSPF areas What Area is configured while configuring Router C interfaces ...I mean its Area A or Area B or Area C... Secondily , Virtual link will come into picture if you define New Area for Router C ..In case when this guy is connected between Router A and Router B in either area i guess you don't need any virtual link at all... It will be better to just draw ur diagram in Ascii and post it over ... Regards, Muhammad -----Original Message----- From: owner-ietf@ietf.org [mailto:owner-ietf@ietf.org]On Behalf Of Liao Wei Sent: April 24, 2002 9:48 AM To: 'PLACID,JOSEPH (Non-A-India,ex1)'; ietf@ietf.org Subject: RE: OSPF areas Hi further question: There are two non-backbone areas (area A, area B) with ABRs connected to the backbone (ABR A for area A and ABR B for area B). Normaly, area A will get routing information about B from backbone with summary LSAs. If between area A and B there is an router C with some port connect to A and some port connect to B. 1. Is this router an ABR? 2. If there is no Vitrual links configured for this router to connect to backbone. The routes in area A to networks in area B which directly connected to router C may not be the shorest path. 3. How to address this problem? Regards -Wei Liao -----Original Message----- From: owner-ietf@ietf.org [mailto:owner-ietf@ietf.org]On Behalf Of PLACID,JOSEPH (Non-A-India,ex1) Sent: Wednesday, April 24, 2002 2:43 AM To: 'ietf@ietf.org' Subject: OSPF areas Hi, Can an OSPF router be included in two OSPF areas? What is the definition of an OSPF Area Border Router, is it - A router that is part of a single OSPF area (the router has only one link state database) but has an interface that connects to a different area? OR is it - a router that is included in two different areas (the router will have two link state databases)? Does Area Border Routers have copies of the link state databases of all areas it connects to? rgds, Joseph Placid