Is there any method for changing the mac-address of a Interface Unit VLAN-Tagged interface(Sub-interface)
This is not supported. There are workarounds:
1/ use VRRP on this unit, no need for VRRP backup. Then this unit will accept 2 dst MACs: one from phys.interface, and VRRP VMAC.
2/ use stub bridge-domain with IRB instead of L3 subinterface. Changing MAC address on IRB unit is supported.
Thank you for the answer.
Only one stupid question here:
Can I form OSPF relation over VRRP address? As Far as I know OSPF is only formed over actual Interface(Maybe I am wrong)
OSPF adjacency using VRRP VIP as source IP is not supported.
That being said, BGP session using VRRP VIP as source IP is supported in JUNOS.