Thank you Rodolfo Alonso Hernandez for promt response,
Please find the relevant version information below:
Neutron version: 7.8.0
Nova version: 18.4.0
I'm using default neutron policy.
For reference, fault execution request:
Error: Failed to live migrate instance to host "compute3".
Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible. <class 'nova.exception_Remote.MigrationError_Remote'> (HTTP 500) (Request-ID: req-f7aa968d-5ce1-45aa-8219-028bf9a765ca)
Neutron logs can be found in this link:
https://drive.google.com/drive/folders/12q6kicN492-hgwtISK1hcymeH52A2eCb?usp=drive_link