PLANET Web Switch Family

Web / SNMP MANAGEABLE

SGSW-2403

24-Port 10/100/1000Mbps stackable switch

Troubleshooting of
SGSW-NMU

B.1 Troubleshooting Chart

Troubleshooting Chart
Symptom	Action
Cannot connect using Telnet, Web browser, or SNMP software	Be sure to have configured the agent with a valid IP address, subnet mask and default gateway. Check that you have a valid network connection to the switch and that the port you are using has not been disabled. Check network cabling between the management station and the switch. If you cannot connect using Telnet, you may have exceeded the maximum number of concurrent Telnet sessions permitted. Try connecting again at a later time.
Can't access the on-board configuration program via a serial port connection	Besuretohave settheterminalemulator programtoVT100compatible, 8 data bits, 1 stop bit, no parity and 19200 bps. If the switch is configured for Auto (baud rate detection), the terminal emulator program must be set at 2400~19200 baud, 8 data bits, 1 stop bit, no parity, and flow control set to none. Also, you must first press the Enter key once to set the data rate and initialize the connection. Check that the null-modem serial cable conforms to the pin-out connections provided in Appendix B.
Forgot or lost the password	Contact PLANET Technical Support for help.

B.2 Upgrading Firmware via the Serial Port

You can upgrade system firmware by connecting your computer to the serial port on the switch, and using a console interface package that supports the XModem protocol. (see "Require connections")

1. Restart the system by using the Restart System command or resetting the power by pulling out the power cord, waiting five seconds, and plugging it back in.
2. When the system initialization screen appears as shown below, press "D" to download system firmware, and then indicate the code type (1: Runtime, 2: POST, 3: Mainboard).  

For example, if you select 1 (for downloading agent firmware), the system will
display the following message:

 

3. Change your baud rate to 115200 bps, and press Enter to enable download mode. From the terminal emulation program, select the file you want to download, set the protocol to XModem, and then initialize downloading.

   NOTES:

   If you use Windows HyperTerminal, disconnect and reconnect to enable the new baud rate. The download file should be a binary file from PLANET; otherwise the agent will not accept it. The file naming convention is: Runtime program: Agent-Vx.yz, POST program: Boot-Vx.yx, and Mainboard program: 8051-Vx.yz After the file has been downloaded, the console screen will display information similar to that shown below. Press "s" to start the management interface, change the baud rate back to 19200, and press Enter. The Logon screen will then appear.

    

For details on managing the switch, refer to Chapter 5 for information on the out-of-band console interface, or Chapter 6 for information on the Web interface.