RE: Auto Summary Revisited

Good article on eigrp auto-summary:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094c
b7.shtml#auto

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Bilal Hansrod
Sent: 04 September 2010 02:44 PM
To: Cisco certification
Subject: Auto Summary Revisited

Hello Team,

I'm trying to get my head around to understand EIGRP auto-summary. I have
read some archive and various material, but unable to understand in detail.
What I understood so far is that, EIGRP auto-summary will summarise routes
that have same first 8 bit, For example,

R1 has multiple loopbacks 10.0.0.0/24, 10.0.1.0/24, 10.1.0.0,
10.2.0.0/24,11.0.0.0/24, 11.1.0.0/24, 12.1.1.0/24, 12.2.2.0./24, so if the
auto-summary is enabled, it will create a summary route in it's routing
table and point to null interface to as a loop prevention technique.
Then it will advertise 10.0.0.0/8, 11.0.0.0/8, 12.0.0.0/8 to neighbour
routers. Is this correct understanding, if not can anyone please explain.
What will happen if that was RIP with auto summary enabled.

Regards,

Bilal

Blogs and organic groups at http://www.ccie.net
Received on Sat Sep 04 2010 - 14:56:10 ART