Hello dear community, my question is about these EIGRP commands, the I

[ALEXANDER536]

router EIGRP 20

redistribute connected

no auto-summary

eigrp stub connected summary

network 10.0.0.0

network 192.168.0.0

[balaji.bandi]

those are valid commands, what is the query.

more information good to start from here :

https://community.cisco.com/t5/networking-knowledge-base/how-to-configure-eigrp-for-ip/ta-p/3132134

[MHM Cisco World]

Hi Friend 
can you please more elaborate which command you talk about ?

MHM 

[ALEXANDER536]

The serious question, I am in a company that these days, I do not create backup, and the configuration that that layer 3 switch has is something like this:

outer EIGRP 20

redistribute connected

no auto-summary

eigrp stub connected summary

network 10.0.0.0

network 192.168.0.0

outer EIGRP 20

redistribute connected

no auto-summary

eigrp stub connected summary

network 10.0.0.0

network 192.168.0.0

[MHM Cisco World]

I will share series of Lab show each command how it effect 

1- redistribute connect <<- this make EIGRP redistrubte any prefix show in RIB as connected
include interface connect to L3 device and LO 

2- no auto-summary <<- this legacy no one use it any more because all IGP now use classless not classful 
it summary classful subnet or not (when we use NO with command) this command use mainly in RIP 
but some engineer use NO auto-summary just to sure that eigrp not auto-summary prefix to it classful 

[MHM Cisco World]

3- eigrp stub connected
this command make eigrp not advertise to neigbor (all) any prefix Except connected prefix 
here in lab you can see only Lo is advertise even if you under the f0/0 of R2 there is eigrp summary prefix 

4- eigrp stub connected summary 
here eigrp not advertise any prefix Except the connected and summary 
you see the R2 now advertise the summary 22.0.0.0/8 to R1 

NOTE:- when you config summary and advertise to neighbor of eigrp any prefix include in that summary will now not advertise that inlcude LO2 and LO21 since it prefix is include in summary