This is cool..it took few minutes to understand this concept
(f0/0 172.16.0.0/255.255.248.0) R1<---->R2 (f0/0 172.18.0.0/255.255.248.0)
By default EIGRP auto summarizes.
# network 172.16.0.0 0.0.7.255
I thought it should advertise same to the other router as it auto summarizes...but what I saw is it auto summarizes to 172.16.0.0/16 in R2....hmmm
So By Default it auto summarizes to classfull subnet
If I choose no auto-summary then it will populate each network i.e. from 172.16.0.0 to172.16.7.0
But I wanted to summarize routes to 172.16.0.0/21
after lil research I found
# int f0/0
# ip summary-address eigrp 12 172.16.0.0 255.255.248.0
aha...now i can see summarized route
Its an amazing journey...each day a new concept...i like it
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