'Over-ride the get_router_cidrs function to return the list.
This function is overridden to provide the complete list of
floating_ip cidrs that the router hosts.
This includes the centralized floatingip cidr list and the
regular floatingip cidr list that are bound to fip namespace.'

def get_router_cidrs(self, device):

    fip_cidrs = super(DvrEdgeRouter, self).get_router_cidrs(device)
    centralized_cidrs = set()
    if self.get_ex_gw_port():
        centralized_cidrs = self._get_centralized_fip_cidr_set()
    return (fip_cidrs | centralized_cidrs)
