[R] How to aggregate combinations

[Oritteropus]

Hi all, 
Given a table like the one below, I want to get a number of vectors equal to
the groups of connected ID (ID are considered connected if they are in the
same row). Each vector should contains all the connected ID . 

e.g. In this case: vect1  (1,2,3)         vect2  (5,6)     vect3 (7,8,9)

ID ID2 
1    2 
1    3 
2    3 
6    5 
7    8
8    9

Does someone know how to do it automatically for tables with thousands of
rows?
Thanks a lot

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