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Telnet and HyperTerminal
Accessing the Command Line Interface via Telnet or Windows HyperTerminal using TCP/IP may not work
correctly on some platforms unless it has been configured to send line feeds with carriage returns. To set
this for Telnet enter set crlf when in command mode. To set this for HyperTerminal click on the Settings
tab in the Properties screen, click ASCII Setup.. and ensure that Send line ends with line feeds is checked
within the ASCII Sending section.
You should not configure HyperTerminal in the above way if you are using a console cable to make a direct
connection to the Switch.
Software Update Utility
The Software Update Utility (SUU) is a Windows application used to serially update the software to the
Switch via the console port. The preferred method for updating the software on the Switch is via a TFTP
upgrade. The SUU should only be used if a TFTP upgrade has failed. This utility is available on the CD-
ROM that accompanies your Switch.
SLIP
The SLIP interface can only be accessed though the console port on unit1, the console port on other units
can not access this interface.
Traceroute
Traceroute implementation is using UDP probe packets to perform the traceroute operation. MS-DOS or PC-
DOS systems have a Non-Standard implementation of TCP/IP, which may cause them to not respond to the
Traceroute UDP probe packets.
QoS
If you have configured QoS on a single unit (such as the SuperStack 3 Switch 4924, 4950, or the 3Com
Switch 40x0) and it merges with a unit having fewer QoS capabilities (Switch 4900 and 4900 SX) to create a
mixed Distributed Fabric, some of the user configured settings may be lost. 3Com recommends configuring
QoS after the Distributed Fabric has been created.
Software Upgrade
If you start a software upgrade using the CLI or a web browser, the switch will report the status of each unit
as it finishes its upgrade. If you are upgrading a Distributed Fabric and use the web, or connect to the CLI
using telnet, and your computer is directly connected to a port on the Distributed Fabric, the connection will
break when the unit with that port completes its upgrade and restarts. If there are other units still to upgrade
at this point, you will not get status reports about them, but the upgrade should continue normally. You can
check this by using the system summary command on each unit and verifying that the Operational Version
shows the correct version of software. Note that this problem will not occur if your computer is connected
indirectly via a hub, a router, or another switch that is not part of the Fabric.