Firepower Migration Tool v1.2.3 - MTU Error

[Zeeshan Ahmed]

Has any one used the new firepower migration tool (From ASA to Firepower) version 1.2.3?

I have been trying but at the last stage it gives me the MTU error.

Migration Status
Reason for Failure: Error while pushing: Invalid Value for MTU, Allowed range: 64 to 65535.. Please refer logs for more details.

I tried removing all the admin down interfaces from Firewall config.

Made sure that MTU is given on all active interfaces.

But no vain.

any help?

[pasa barnett]

I had this this same issue and I resolved with the help of TAC. I changed the MTU on the diagnostic interface to 1450 and that resolved my issue. Migration tool went through successfully after that. Now I'm just hoping I don't have some weird behavior down the line due the MTU being set to 1450. you know Cisco.....