Simple Doubt regarding BGP

Hi Experts,

Very basic question

Suppose I have this ip address configured on my loopback Interface of R1

2.2.2.2/8

Now under my BGP Process if i advertise this network as

network 2.2.2.2

OR

network 2.0.0.0

Now in first case I don't see this network in the BGP table of the other
router but
if I follow the second case the network is seen.

Can anyone please explain why is it doing like this??

-- 
Warm Regards
Raghav
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