Specifications
Chapter 20 - Troubleshooting SNMP Management Software Issues
184
Mediatrix 4100
DESCRIPTION: When I try to set a variable with a MIB configuration tool such as Media5 Unit Manager
Network, nothing happens.
POSSIBLE CAUSE: The variable may be in a MIB that is located under the mediatrixExperimental branch
of the MIB structure.
Media5 configuration tool – the Unit Manager Network – does not support MIBs that are located under
the mediatrixExperimental branch of the MIB structure. The Unit Manager Network does not have
specific tasks to manage variables in experimental MIBs.
The mediatrixExperimental branch is the area where objects and events in MIBs under development
can be placed without fear of conflicting with other MIBs. When the items rooted under an experimental
sub-tree are ready for release, they will be under a permanent branch.
Even though the Unit Manager Network can view experimental MIBs, SNMP operations may not work
properly on them.
DESCRIPTION: After downgrading the software version, one or more MIB variables are “empty” (the Unit
Manager Network shows an “unknown enumeration value”) and the Mediatrix 4100 uses the default value
instead of the value I had set.
POSSIBLE CAUSE: The more recent version of the software has MIB variables that contain settings not
available in the previous version. The Mediatrix 4100 cannot recognize the values and automatically
uses the default value.
SOLUTION: Manually set the MIB variable to the value you want and restart the Mediatrix 4100.
DESCRIPTION: When viewing a table, the unit does not respond.
POSSIBLE CAUSE: It may take time to fill completely a table: from 1 to 5 seconds. This is normal, because
the unit is an embedded device with limited processing power.
DESCRIPTION: Is it possible for a hacker to change the content of SNMPv3 variables once the Mediatrix 4100
is in secure mode management?
POSSIBLE CAUSE: In secure management mode, the Mediatrix 4100 works in SNMPv1 read-only,
SNMPv2c read-only, and SNMPv3 read/write. SNMP requests using the first two protocols are read-
only, and tables used for setting up SNMPv3 users hide the passwords they carry. Because hackers do
not know what password to use in SNMPv3 requests, they cannot access the Mediatrix 4100 with read-
write permission.