Hi !This topic must be on the "CCIE R&S Lab Workbook Volume I Version 4.1" forum but I see that it was not much visited so I decided to post it here. I hope you don't mind me posting it here. I am currently reviewing CCIE Volume 1: BGP (iBGP Synchronization) and I can't figure out what is the reason R1 would not redistribute 5.5.5.5/32
This is R1's BGP table:
R1#sh ip bgp
BGP table version is 3, local router ID is 14.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 4.4.4.4/32 14.0.0.4 0 0 4 i
*>i5.5.5.5/32 25.0.0.5 0 100 0 5 i
R1#
The bullet objective says: "Redistribute R4 and R5's loopback interfaces into OSPF on R1 and R2 respectively, what happens?". I started on R1 with this command
"redistribute bgp 1 subnets"
(I know I could have redistributed with ip prefix-list and a route-map but I just tried the "redistribute" and see what happens.)
At first I was expecting the 2 BGP routes to enter R3's routing table, but all I can see is this:
O E2 4.4.4.4 [110/1] via 13.0.0.1, 00:48:48, Serial1/2
And then I thought 5.5.5.5/32 might not be redistributed because of split-horizon.
So now I want to know the reason ... Is it because it is a loop prevention mechanism by R1 ? Is it because R1 would only redistribute external BGP ? I want to know the logic why R1 would not redistribute 5.5.5.5/32 ? Hope you could help me out.
Regards,
Bib