openstack/neutron
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Merge "[Docs] Add info about vlan transparent networks' MTU"

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Zuul 2021-06-21 17:51:18 +00:00 committed by Gerrit Code Review
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doc/source/admin/config-mtu.rst
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@ -129,3 +129,12 @@ while the L3 agent provides an appropriate MTU value to instances using
IPv6. IPv6 uses RA via the L3 agent because the DHCP agent only supports IPv6. IPv6 uses RA via the L3 agent because the DHCP agent only supports
IPv4. Instances using IPv4 and IPv6 should obtain the same MTU value IPv4. Instances using IPv4 and IPv6 should obtain the same MTU value
regardless of method. regardless of method.
Networks with enabled vlan transparency
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In case of networks with enabled vlan transparency, if additional vlan tag is
configured inside guest VM, MTU has to be lowered by 4 bytes to make space for
additional vlan tag in the packet's header.
For example, if network's MTU is set to ``1500``, value configured for the
interfaces in the guest vm should be manually set to ``1496`` or less bytes.