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New Member

Eigrp summary route question

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

2 ACCEPTED SOLUTIONS

Accepted Solutions

Re: Eigrp summary route question

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.

Cisco Employee

Re: Eigrp summary route question

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

5 REPLIES

Re: Eigrp summary route question

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.

Cisco Employee

Re: Eigrp summary route question

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

New Member

Re: Eigrp summary route question

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

Cisco Employee

Re: Eigrp summary route question

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

New Member

Re: Eigrp summary route question

Hi,

Thanks for reply

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