Without access to RB850 after upgrade to v6.21rc21.
Install v6.21rc21 with netinstall it works.
Max MTU is still 1506
att.
dzieva.
Upgrade ordinary from v6.21rc21 to v6.21.rc22 no problem.
Max MTU is still 1506
Upgrade to v6.21.rc24
Max MTU is still 1506.
Upgrade to v6.21 (2014-Oct-29 09:41):
Max MTU is still 1506.
Mikrotik support:
Hello,
L2MTU on RB850Gx2 will be improved in one of the next few RouterOS releases, we
are working on it.
Regards,
Janis B.
Upgrade to v6.22rc4
Max L2MTU is now max 1502, lower than before (1506).
Since the v6.21 has died soon after birth, we expect an increase of Max L2MTU for the next version.
Mikrotik team increases not decreases …
Upgrade to v6.21.1
Max L2MTU is now max 1580.
Work great.
Thanks Mikrotik team.