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lab5 eigrp stub and advertising connected routes - evesan - 04-30-2012

Hi,
I build lab5 with gns3 and in my simulation the network 172.16.1.0 / 24 is not advertises by R3 to its neigbor R4.
It will be only advertised if I either put a network statement 172.16.0.0 or redistribute connected command under router eigrp.
There is some cisco doc about eigrp stub connected ....
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/eigrpstb.html
but it is not really clear. It says:
-------
The connected keyword will permit the EIGRP Stub Routing feature to send connected routes. If the connected routes are not covered by a network statement, it may be necessary to redistribute connected routes with the redistribute connected command under the EIGRP process. This option is enabled by default.
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It may be neccessary .... ??? Depending on what ?
If I put a network 172.... command, I dont need a redistribute connected at all, right ? If I put redistribute connected, I dont need the eigrp stub ____connected____ option, so ?
Confused .
Any ideas to find a logic in there ?
Evesan