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Community Member

Configuring EIGRP STUB/SUMMARIZATION

Hi All,

May i appeal to anyone to please help me these two questions concerning EIGRP stub/Summarization?.

Q1.I configured the following:

Router2(config-subif)#ip summary-address eigrp 100 2.2.4.0 255.255.252.0 "point to R1, and expect it to create a Null0 summary address on the local router, unfortunately it doesn't.......any idea of what could be missing?, also could not "leak-map" despite being IOS 12.4, any reason why?

Q2.When summarizing routes i.e (2.2.0.2 - 2.2.3.2/24), which happens to be 2.2.4.0/22, my question here is,is it possible to make it 2.2.0.0 255.255.252.0 when advertising the summary routes or it MUST be precise?.

Thank you all your your usual assistance,

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Configuring EIGRP STUB/SUMMARIZATION

A1. The reason the summary route to null0 is not installed is most likely that the interface on which the "ip summary-address" statement is applied doesn't fall into the range specified by that same command.

A2. You can make the summary route whatever you want up to a 0/0 route if you wanted.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
3 REPLIES
Cisco Employee

Re: Configuring EIGRP STUB/SUMMARIZATION

A1. The reason the summary route to null0 is not installed is most likely that the interface on which the "ip summary-address" statement is applied doesn't fall into the range specified by that same command.

A2. You can make the summary route whatever you want up to a 0/0 route if you wanted.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Community Member

Re: Configuring EIGRP STUB/SUMMARIZATION

Hi,

My thanks for the great response. My concerns is now resolved.

Regards

Re: Configuring EIGRP STUB/SUMMARIZATION

Hi,

The closest summary of 2.2.0.2 - 2.2.3.2/24 is 2.2.0.0/22, not 2.2.4.0/22.

(Actually what you exactly want to advertise)

Cheers:

Istvan

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