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# extension_drivers =
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# Example: extension_drivers = anewextensiondriver
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# =========== items for MTU selection and advertisement =============
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# (IntOpt) Path MTU. The maximum permissible size of an unfragmented
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# packet travelling from and to addresses where encapsulated Neutron
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# traffic is sent. Drivers calculate maximum viable MTU for
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# validating tenant requests based on this value (typically,
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# path_mtu - max encap header size). If <=0, the path MTU is
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# indeterminate and no calculation takes place.
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# (IntOpt) Segment MTU. The maximum permissible size of an
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# unfragmented packet travelling a L2 network segment. If <=0,
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# the segment MTU is indeterminate and no calculation takes place.
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# (ListOpt) Physical network MTUs. List of mappings of physical
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# network to MTU value. The format of the mapping is
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# <physnet>:<mtu val>. This mapping allows specifying a
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# physical network MTU value that differs from the default
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# physical_network_mtus =
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# Example: physical_network_mtus = physnet1:1550, physnet2:1500
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# ======== end of items for MTU selection and advertisement =========
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# (ListOpt) List of physical_network names with which flat networks
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# can be created. Use * to allow flat networks with arbitrary