EIGRP AD if summary is configured on interface

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Mar 4th, 2010
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Hi,


I have router A having BGP routes for 20.80.0.0/24 & 20.40.0.0/24. I have redistributed those external routers into EIGRP. S0/0 of Router-A is connected with Router-B. ON S0/0, I have summarize network on eigrp like--


Router-A (S0/0)
ip summary-address eigrp 1 20.80.0.0 255.255.0.0 5

ip summary-address eigrp 1 20.40.0.0 255.255.0.0 5


I want to know, on router-B, eigrp AD for 20.40.0.0/16 & 20.80.0.0/16 will 90 or 170? Please help.

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KARUPPUCHAMY MA... Thu, 03/04/2010 - 02:24
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Hi,


The AD for  for 20.40.0.0/16 & 20.80.0.0/16 will be 90. because when you are summarizing the network, there will be 2 summarized routes will be installed into your routing interface with next-hop as null interface.


Finally these summarized routes are going to advertise into your neighbor.So the neighbor router will think that this as a eigrp routes. so the AD will be 90.


for more information have a look into the below url


http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml#summarization


Regards

Karuppu

KARUPPUCHAMY MA... Thu, 03/04/2010 - 02:27
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Hi,


Glad to help you.if you find this post is useful, just rate it.


Regards

Karuppu

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