openstack-manuals/doc/config-reference/source/tables/neutron-ml2_gre.rst

Description of ML2 GRE configuration options

Configuration option = Default value	Description
[ml2_type_gre]
tunnel_id_ranges =	(List) Comma-separated list of <tun_min>:<tun_max> tuples enumerating ranges of GRE tunnel IDs that are available for tenant network allocation