Indicates a gateway addresses this router backs
up. Any gateway address can be backed up by a
group of routers with one as the master and the
others as backup. An instance of this object
refers to one such group. Note that this object
is defined in addition to extremeEsrpGroup.
Whereas the extremeEsrpGroup refers to the group
information advertised by this host the
extremeEsrpNeighborGroup refers to the group
information reported by the neighbor. There
might be a conflict. Only the default group
1 is supported currently.