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Upgrade via TFTP Boot/Diag Mode Fails Through a Switch



Article ID: KB5227 KB Last Updated: 28 Jun 2010Version: 3.0
Upgrade via TFTP Boot/Diag Mode Fails Through a Switch
TFTP server and NetScreen self IP address on same subnet
NetScreen trust interface connected to switch
Administration PC connected to switch
Cannot upgrade via tftp bootrom
Console message: ### Sys Warning: tftp timeout max!


When the NetScreen device is in the Boot/Diag mode, the NetScreen cannot negotiate a duplex mode. With the switch running a spanning tree, it normally tries to negotiate the duplex mode.

To resolve the upgrade via TFTP Boot/Diag mode failure through a switch issue, perform the following steps:

Remove the Ethernet cable from the NetScreen device to the switch.Connect the Trust interface cable directly to the administration PC.Upgrade the ScreenOS via the Boot/Diag mode. For information on how to upgrade the firmware via the Boot/Diag mode, go to Upgrading the ScreenOS Firmware via Boot/Diag Mode.

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