EIGRP null update packet

Unanswered Question
May 9th, 2010

Hi experts.

When i turn on eigrp on 2 routers connected via ethernet interfaces, i see them exchanging hellos and then exchanging null update packets (using wireshark). Why is that so ? By null means, no prefixes are exchanged just a simple update packet is exchanged between these 2. After acknowledging the update packets, they again exchange update packets, this time advertising their prefixes

Why is this so ?

I have this problem too.
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