Hi All,
I have two routers, R1 and R2. Each of them has a loopback interface
with R1 (10.1.1.1/24) and R2 (10.2.2.2). I am running a serial link
between them in the 172.16.0.0 net. They are running RIP version 2 with
auto-summary ON.
Since it crosses a major-network boundary, I expect them to summarize
to the 10.0.0.0/8 network. What puzzles me, is that each of them sends
out the summary route, even though it also learns the same summary route
from the other router. I thought split horizon would kick in, and
basically state: "You have learned route 10.0.0.0/8 through interface
s0/0, so dont send out the same net out the interface in which you
learned it"?
R1:
R 10.0.0.0/8 [120/1] via 172.16.0.2, 00:00:01, Serial0/0
R1 debug ip rip:
Mar 1 00:13:12.691: RIP: build update entries
*Mar 1 00:13:12.691: 10.0.0.0/8 via 0.0.0.0, metric 2, tag 0
*Mar 1 00:13:39.867: RIP: received v2 update from 172.16.0.2 on Serial0/0
*Mar 1 00:13:39.867: 10.0.0.0/8 via 0.0.0.0 in 1 hops
R2:
R 10.0.0.0/8 [120/1] via 172.16.0.1, 00:00:17, Serial0/0
R2 debug ip rip:
*Mar 1 00:13:56.535: RIP: build update entries
*Mar 1 00:13:56.535: 10.0.0.0/8 via 0.0.0.0, metric 1, tag 0
*Mar 1 00:14:05.491: RIP: received v2 update from 172.16.0.1 on Serial0/0
*Mar 1 00:14:05.491: 10.0.0.0/8 via 0.0.0.0 in 1 hops
Any ideas?
Sincerely,
Kim Pedersen
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