Jumbo frame support is available in ScreenOS 6.0.0 and above.Jumbo frames are supported on the ISG-1000 and ISG-2000 devices without IDP.
Jumbo frames are also supported on the NS-5000 series running MGT2 and SPM2 cards and the NS-5000 series running MGT3 and SPM3 cards.
Limitation: DI and IDP are not supported in jumbo frame mode.
Enabling Jumbo Frame Mode: To enable jumbo frame mode, use the following command:
set envar max-frame-size=
Set size to any value between 1514 through 9830, inclusive. For example, set size to 7500, as in this example: set envar max-frame-size=7500. Note that there are no spaces before or after the equal sign (=).
Important: When you enable jumbo frames and restart the security device, only interfaces on the 4-port SFP IO card and the management Ethernet interface become active. This scenario is shown in the example below.
Showing Max Frame Size Setting: To show the max-frame-size setting, use the following command:
Disabling Jumbo Frame Mode: To disable jumbo frames support and return the device to the normal maximum frame size (1514 bytes), use the following command:
unset envar max-frame-size