when parsing the list of neighbours available, the OAM submodule of BGP manager filters the BGP neighbors talking VPNv6 with the neighbors that have natively an IPv6 address, whereas there is no relationship between the neighbor IP address and the VPNv6 ability supported by that neighbor.

The fix consists in modifying the BGPManager code so that the filtering applies to IPv4 type. ( since underlays tunnels are for now only related to IPv4)