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28 USING THE HUB: SNMP Management Features
SNMP Management Features
The M208 includes a private Management Information Base (MIB) file that contains a
number of variables and traps that can be used to configure, monitor and manage all
aspects of the unit. The M208 supports both MIB II and private MIBs, allowing it to
be a fully managed agent using a SNMP manager such as HP’s OpenView, Sun’s Sun-
Net Manager, and Castle Rock’s, SNMPc.
The MIB is included in a file called mplxmib.txt that can found on the host software
disk. This file can also be downloaded from the Microplex FTP site
(ftp.microplex.com: support/m208/misc/mplxmib.txt) or can be accessed via the
Microplex Web site (http://www.microplex.com/).
For a complete description of SNMP, the MIB file, and how to set up an SNMP user,
please see Managing With SNMP on page 141.
Troubleshooting the Hub
This section covers some basic troubleshooting tips regarding the operation of the hub
component of the M208. For information on troubleshooting the print server compo-
nent of the M208, please see TROUBLESHOOTING THE M208 on page 159.
Basic Troubleshooting Tips
• Ensure that the connections are secure and the hub is powered-up,
• If a transceiver is connected to the AUI port, make sure the SQE test is turned off.
If you connect a transceiver to the AUI port and the SQU test is turned on,
excessive collisions, short events, or dropped packets between the M208 and the
device connected to the AUI port can occur,
• Ensure that you have a valid network topology and that you are complying with
standard Ethernet practices regarding length of cable runs, number of hops, etc.
Additional Troubleshooting Tips
• If you plug a device into one of the RJ45 ports (Hub to DTE) and the LED does
not turn on, try plugging it into port one and setting the selector switch to the
crossed-over position (X). If this works, either use port one or change to a
straight-through cable.