I have got a problem with FR Config Running OSPF. Router A & B are connected to C & D over FR PVC but they don't have to talk to each other. It means A connected to C & D and B is also connected to C & D. I am using FR Subinterfaces with pt-to-pt. What is happening that sometime I am able to ping to router C & router D subinterfaces from router A but sometimes i don't get any response. I am even unable to ping sub-intf of Routers from within the routers. See sample config of one of the routers that i have: interface Serial0 no ip address ip directed-broadcast encapsulation frame-relay ip ospf network broadcast no ip mroute-cache ! interface Serial0.1 point-to-point ip address 131.18.19.185 255.255.255.252 ip directed-broadcast ip ospf network broadcast frame-relay interface-dlci 310 ! interface Serial0.2 point-to-point ip address 131.18.19.189 255.255.255.252 ip directed-broadcast ip ospf network broadcast frame-relay interface-dlci 210 This is config of router B connected to C & D and subintf of C &D are on same subnet as subintf 0.1 and 0.2 on this router. Is pt-to-pt with sub-intf OK for this scenario? Any suggestions... What is the possible cause of problem?? Why I am even unable to ping local subintface from within the router?? Thanks.. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]