The virtual routers added for to this VRRP vrgroup.
The selected virtual routers are presented in a bitmap format.
in receiving order:
OCTET 1 OCTET 2 .....
xxxxxxxx xxxxxxxx .....
|| || |_ Virtual Router 9
|| ||
|| ||___ Virtual Router 8
|| |____ Virtual Router 7
|| . . .
||_________ Virtual Router 2
|__________ Virtual Router 1
where x : 1 - The represented Virtual Router is added
0 - The represented Virtual Router is not added