openstack/neutron
Code Issues Proposed changes

Merge "ML2: Update help text for path_mtu"

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2016-02-06 00:45:34 +00:00
committed by Gerrit Code Review
parent 759e55929a fba77ff580
commit 427ba8d470
1 changed files with 12 additions and 8 deletions
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20
neutron/plugins/ml2/config.py
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@@ -40,14 +40,18 @@ ml2_opts = [
"neutron.ml2.extension_drivers namespace. "
"For example: extension_drivers = port_security,qos")),
cfg.IntOpt('path_mtu', default=0,
help=_('The maximum permissible size of an unfragmented '
'packet travelling from and to addresses where '
'encapsulated Neutron traffic is sent. '
'Drivers calculate maximum viable MTU for validating '
'tenant requests based on this value (typically, '
'path_mtu - maxmum encapsulation header size). If <= 0, '
'the path MTU is indeterminate and no calculation '
'takes place.')),
help=_('Maximum size of an IP packet (MTU) that can traverse '
'the underlying physical network infrastructure without '
'fragmentation. For instances using a '
'self-service/private network, neutron subtracts the '
'overlay protocol overhead from this value and '
'provides it to instances via DHCP option 26. For '
'example, using a value of 9000, DHCP provides 8950 '
'to instances using a VXLAN network that contains '
'50 bytes of overhead. Using a value of 0 disables '
'this feature and instances typically default to a '
'1500 MTU. Only impacts instances, not neutron network '
'components such as bridges and routers.')),
cfg.IntOpt('segment_mtu', default=0,
help=_('The maximum permissible size of an unfragmented '
'packet travelling a L2 network segment. If <= 0, the '