Checkmates Post Link:

https://community.checkpoint.com/t5/Security-Gateways/Configure-Jumbo-Frames-on-Check-Point-Appliance-MTU-9000/m-p/100969#M7878

We are going to configured the jumbo frames in Check Point 5000s appliance which running on R80.30 OS.

Just have a one query :

We have VLAN configured interface so can we only increase the MTU on Physical interface or on each VLAN or both physical and VLAN.

We configured jumbo frames in CP GW with specific VLAN.

Hear we have One BOND interface having multiple VLAN configured so first I try to configure jumbo frames in two physical interface but I am unable to configure because that both interface are part of BOND so later I am enable Jumbo frames on BOND.After that when I checked in each physical interface then its showing that mtu set to 9216.

But again when I checked and found that MTU is not apply on each VLAN which part of the BOND interface.

So again I changed the MTU on specific VLAN and now we successfully configured the jumbo frames on specific VLAN which basically our requirements.

But now as I mentioned earlier that we only change in some of VLAN so then what about the remaining VLAN which part of that particular BOND ?

is there any impact because that remaining VLAN are now still showing MTU 1500 but physical interface having 9216 ?

Each VLAN can have a different MTU, the thing is when you set a interface, bond or physical, to support Jumbo frames by setting the MTU to 9216, you can still have VLANs with a lower MTU value. The only thing is that the physical interface defines the max vaslue for the MTU, meaning you cannot set a VLAN to 9216 with the Bond set to 1500.

Every newly created VLAN with inherit the value from the interface it is created upon.