neutron/releasenotes/notes/path-mtu-back-to-zero-e4f9e8bdd8317ad4.yaml

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---
upgrade:
- In case you rely on the default ML2 path_mtu value of 1500 to cap MTU used
for new network resources, please set it explicitly in your ml2_conf.ini
file.
fixes:
- The default value for ML2 path_mtu option is changed from 1500 to 0,
effectively disabling its participation in network MTU calculation unless
it's overridden in the ml2_conf.ini configuration file.