Max MTU in Routing Protocols inside my Corporate Network

RouterOS Forwarding Protocols
1

Hi,

My company has several fiber rings inside to connect all the buildings (campus topology) .
Each set of building has its own IP addressing and I use OSPF inside management vlan to publish the IP ranges.

We only has MikroTik for routing because the Fiber wires are coonected to Aruba Switches.
The MTU in Mikrotik Routers is 1500 (default):

How much I have to increase my MTU to support a correct throughput in my FO network?

Thanks

2 
/interface/ethernet set ether1 mtu=9000 l2mtu=9000

or what MTU you prefer.

You probably need to set the (L2)MTU on the Aruba-switches as well.

3

Thanks!!
As you said I will check the MTU un Aruba Switches.