Eigrp summary route question

Answered Question
Apr 9th, 2010
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Hi all,


If we have Router A connected to 3 different networks and is using EIGRP


172.16.5.144/28

172.16.5.160/28

172.16.5.128/28


so what summary route will be shown in output of sh ip route on Router A


many thanks

mahesh

Correct Answer by Nagendra Kumar ... about 7 years 2 months ago

Mahesh,


Yes. When you configure eigrp summary address of 172.16.5.128/26, it will have an entry in local RIB pointing to null interface.


Regards,

Nagendra

Correct Answer by Federico Coto F... about 7 years 2 months ago

Hi,


If you want a single summary statement, the best one is this:


172.16.5.128/26

Just make sure there are no overlapping in any other part of the network.


Federico.

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Correct Answer
Federico Coto F... Fri, 04/09/2010 - 16:24
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Hi,


If you want a single summary statement, the best one is this:


172.16.5.128/26

Just make sure there are no overlapping in any other part of the network.


Federico.

Nagendra Kumar ... Sat, 04/10/2010 - 02:52
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  • Cisco Employee,

Hi Mahesh,


From your description, all 3 networks are connected to Router A. So it all will be shown as connected route in routing table. There wont be any summary route generated by default.


If you configure a EIGRP summary, an entry pointing to null interface will be installed in your routing table.


HTH,

Nagendra

mahesh18 Sat, 04/10/2010 - 07:44
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Hi,


thanks for reply


so if i config this as summm router then entry in routing table will be



172.16.5.128/26  and it points to null table right?



mahesh

Correct Answer
Nagendra Kumar ... Sat, 04/10/2010 - 07:57
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  • Cisco Employee,

Mahesh,


Yes. When you configure eigrp summary address of 172.16.5.128/26, it will have an entry in local RIB pointing to null interface.


Regards,

Nagendra

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