Public bug reported:
My goal is to achieve an MTU of 1500 for both Vlan and Vxlan based
tenant networks.
So I set the path_mtu to 1550, while leaving global_physnet_mtu at the
default value of 1500.
However, the MTU for my Vxlan networks is still calculated as 1450,
because the underlying MTU is calculated as min(1500,1550)=1500 and then
the encapsulation overhead is subtracted from that.
IMHO the correct calculation would be to subtract the encapsulation
overhead only from the path_mtu if it is specified and possibly take the
minimum of that and global_physnet_mtu.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1592017
Title:
ML2 uses global MTU for encapsulation calculation
Status in neutron:
New
Bug description:
My goal is to achieve an MTU of 1500 for both Vlan and Vxlan based
tenant networks.
So I set the path_mtu to 1550, while leaving global_physnet_mtu at the
default value of 1500.
However, the MTU for my Vxlan networks is still calculated as 1450,
because the underlying MTU is calculated as min(1500,1550)=1500 and
then the encapsulation overhead is subtracted from that.
IMHO the correct calculation would be to subtract the encapsulation
overhead only from the path_mtu if it is specified and possibly take
the minimum of that and global_physnet_mtu.
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