I found the solution, Ive tested it out with the topology on LAB21. As far as I can see, eigrp split horizon is enabled on physical interfaces and multipoint subinterfaces. This is somehow against what I was reading on CCIE exam certification guide...
Please can you experts out there clarify the following: Since our FR Net in the LAB 21 is NOT Hub and Spoke, only having disabled eigrp split horizon on R4 (as in the final configs) would not give routing-redundancy. Lets take the following example. R4 is dead and the PVC from R6 to R2 is also dead. Now, if R2 advertises a net, R5 would learn it, but not propagate it to R6 until we configure no ip split horizon eigrp on R5. Is that correct?? Thanks Roger Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Roger RPF Gesendet: Donnerstag, 15. Mai 2008 18:23 An: 'Masood Ahmad Shah'; [email protected] Betreff: Re: [OSL | CCIE_RS] EIGRP split horizon (LAB21) Thanks. I see I was to unspecific. The sentence I mentioned from cisco was only related to EIGRP, but Ive posted only a snapshot of the chapter, so thats why it maybe didnt show the right context. But is it correct that eigrp split horizon is diabled by default on physical serial interfaces running frame-relay? Where can I find a detailed description regarding eigrp split horizon and the different interface types? regards Roger Von: Masood Ahmad Shah [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 15. Mai 2008 17:24 An: 'Roger RPF'; [email protected] Betreff: RE: [OSL | CCIE_RS] EIGRP split horizon (LAB21) The EIGRP split horizon behavior is not controlled or influenced by the ip split-horizon command. Split horizon behavior is turned on by default. In order to disable the split horizon behavior, use the no ip split-horizon eigrp as-number interface command. Regards, Masood Ahmad Shah BLOG: http://www.weblogs.com.pk/jahil/ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roger RPF Sent: Thursday, May 15, 2008 8:14 PM To: [email protected] Subject: [OSL | CCIE_RS] EIGRP split horizon (LAB21) Can someone tell me over which interface types eigrp split horizon is enabled? Is the following correct, taken from a Cisco Book: Most interface types enable split horizon by default, with the notable exception of a physical serial interface configured for frame-relay If thats right, why do we have in LAB21 on R4 on the Serial0/0/0 no ip split horizon eigrp configured? This confuses me... thank you Roger
