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[ScreenOS] The interface card is not recognized on ISG-1000 or ISG-2000 when jumbo frames are enabled

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Article ID: KB12628 KB Last Updated: 17 Sep 2012Version: 2.0
Summary:

This article describes the issue of the interface not being recognized, when Jumbo frames are enabled on ISG 1000 and 2000 devices.

Symptoms:

When Jumbo frames are enabled, not all of the interface cards on the ISG-1000 or ISG-2000 device are being shown.

Cause:

Solution:

Starting with ScreenOS 6.0r5, Jumbo frames are supported on ISG 1000 and ISG 2000 devices (without IDP). They are also supported in ScreenOS 6.1.0r1 or later and ScreenOS 6.2.0r1 or later, on the ISG-1000 and ISG-2000 platforms.

Note: When jumbo frames are enabled and the security device is restarted, only interfaces on the 4-port SFP IO card and management Ethernet interface become active. If you are using any other cards, they will not be recognized and you should switch them to the 4-port SFP IO Card, if this slot needs to be used.


The following excerpts are the expected outputs, before and after and after jumbo frames are enabled:
set envar max-frame-size=7500
unset envar max-frame-size

ISG 1000 without Jumbo frames enabled:
nsisg1000->get chassis
Slot Type
2 4 port miniGBIC (0x3)
3 2 port mini GBIC (0x5)
1 4 port 10/100/1000T
ISG 1000 with Jumbo frames enabled:
nsisg1000->get chassis
Slot Type
2 4 port miniGBIC (0x3)
3 2 port mini GBIC (0x5) (disabled-device in JF env)
1 4 port 10/100/1000T (disabled-device in JF env)

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