To be more precise, it can be bigger than 1550 or 1558, but to use mtu=1500 on tenant networks, those two values are the requirement.
Using bigger value can be a problem especially with OVN when communicating with other external networks through a router because of missing: https://bugs.launchpad.net/charm-neutron-api-plugin-ovn/+bug/1947391
To be more precise, it can be bigger than 1550 or 1558, but to use mtu=1500 on tenant networks, those two values are the requirement.
Using bigger value can be a problem especially with OVN when communicating with other external networks through a router because of missing: /bugs.launchpad .net/charm- neutron- api-plugin- ovn/+bug/ 1947391
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