From: Kenneth Wygand (KWygand@customonline.com)
Date: Sun Jul 04 2004 - 13:45:35 GMT-3
Hello everybody!
Happy 4th of July! It's time for your next brain-twisting quiz question of the day!
R1(s0=.1)----12.12.12.0/24----(s0=.2)R2(lo0=.2)----2.2.2.0/24
R1 connect to R2 through a serial link with a network of 12.12.12.0/24 (R1 uses .1 and R2 uses .2).
R2 also has a loopback0 interface with 2.2.2.2/24.
R1 and R2 are running the following routing protocols between each other:
BGP (External)
RIP (Version 2)
EIGRP
OSPF
R2 advertises its 2.2.2.0/24 network into all of these routing protocols and sends them to R1.
R1 and R2 have all of their routing protocols configured so that R1 receives the exact same network (2.2.2.0/24) in all four routing protocols natively (no redistribution). Routes are -NOT- summarized or entered as host routes anywhere.
R1 has the administrative distances for each routing protocol set as follows:
BGP (External) - AD set to 120
RIP (Version 2) - AD defaults to 120
EIGRP - AD set to 120
OSPF - AD set to 120
The clock rate of the serial interface between R1 and R2 is set to 64000, but the interface bandwidth has not been modified from its default.
The metric derivation algorithm for each routing protocol has -NOT- been modified.
To give all routing protocols a "fair chance", after all configuration is set, both routers are reloaded at the same time.
Now for the questions------------------------
1) Once all routing protocols have converged, which route(s) from which routing protocol(s) will be in the IP routing table?
2) If not all routes from all routing protocols will be active in the IP routing table, which route(s) will be "backup(s)" for the primary route(s) and in what order?
3) What is the determining factor for which route(s) get put into the IP routing table as the primary route(s)?
Good luck with this one. I made up the question and I didn't get the results I expected. Let's see if any of you can get it!
Best of luck, and enjoy your 4th of July holiday!
Ken
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