Rajesh, > I was going thru the Lab 4 of IPEXPERT notes - IGRP/EIGRP. > > I couldn't follow the reason why on Router 4's serial interface "ip > split-horizon" is given.
This is to prevent R4`s IGRP to not re-inject the routes its learned from R2. Remember that R2 and R4 are in the same IGRP routing domain, which IGRP is a distance vector protocol, that is objected to split-horizon`s rule. > I understand that on FR cloud "split-horizon" is disabled by default on > FR physical interfaces and enabled on FR sub interfaces. If thats the > case, why shouldn't we enable it on Routers R5 and R6 which are also on > FR cloud and also having physical interfaces. I think you missed the scenario ! R2, R5, R6 are on EIGRP routing domain, while R2 and R4 are on IGRP. > One thing for sure, is if I remove this "ip split-horizon" config from > R4, I see the network 150.50.24.0 flapping - The output of "sh ip route" > in R2 and R4 says connected/derived from IGRP and after a while it says > "possibly down" network. So much so, if you configure ip split-horizon > back in R4 - these messages go back. You need to enter "ip split-horizon" on R4`s serial interface because R4`s IGRP will re-advertise routes its learned from R2. HTH Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=32570&t=32555 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
