Every multipoint interface needs to have some way of know who is on the other side. Inverse ARP is the default method. Manual L3-L2 mapping certainly works fine as well. Point-to-point configuration changes the logic because now there's no doubt of who's on the other end! So if you were to do "debug ip packet" on each side. One side (that had the mapping) would send things out just fine. The other side (which did NOT have a manual mapping) would receive the packet without a problem, but when it went to reply, you would see "encapsulation failed" messages meaning that it didn't know exactly where to send the response to at a Layer2 address. Either of the methods below would solve the problem! HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al. CCSI/JNCI-M/JNCI-ER VP - Technical Training - IPexpert, Inc. IPexpert Sr. Technical Instructor A Cisco Learning Partner - We Accept Learning Credits! [EMAIL PROTECTED] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 http://www.ipexpert.com _____ From: MAK [mailto:[EMAIL PROTECTED] Sent: Sunday, January 27, 2008 11:58 PM To: [EMAIL PROTECTED] Cc: [email protected] Subject: Fw: Frame Relay porblem HI, attached are two running-config files for respecitve routers R5 and R6... R5 is configured with point to point sub-interface s0/1.1 which is pointing to R6 S0/1 without any point to point subinterface configured on R6. With current config I can't ping either way but when I am doing show frame-relay map on R-5 then I can see the static map to R-6 which is showing active state. But when I see the show frame-relay map on R6 then there is not entry there. I found that communication starts in the below two scenarios: 1) If I enable inverse-arp on R6 s0/1 2) If I configure a point to point sub-interface on R6 with frame-relay interface-dlci command. My questions is why the subinterface is not communicating without giving inverse-arp or making a subinterface on r6. Regards MAK
