What is MTU command under VLAN configuration command do?

[balaji.bandi]

MTU - maximum transmission unit  - will be configured based on the requirement.

by default it is 1500, Layer2 vlan does not have any effect, it only take effect Layer 3 SVI interface.

if that make sense ? or provide more information what you looking for ?

[biju.balan1]

Thanks Balaje for finding some time. 

My question was very clear - what is the MTU under vlan configuration does? I see you said l2 vlan has no effect then why cisco has not deprecated this command all these years? So, there has to be reason. Are you aware what does mtu command under vlan configuration does?