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3-16 MTM400 MPEG Transport Stream Monitor User Manual
SNMP
The MTM400 Simple Network Management Protocol (SNMP) agent is a software
process that responds to queries using the SNMP to provide status and statistics
about the MTM400. This enables management applications to be developed that
can access MTM400 units remotely across a network using SNMP.
Each of the events available from the MTM400 is kept in a database described by a
Management Information Base (MIB). The various values that can be retrieved
from the MIB are called MIB variables. These variables are defined in the MIB for
the MTM400. Each MIB variable is named by an Object Identifier (OID).
The MTM400 MIB is documented in the MTM400 MPEG Transport Stream
Monitor Programmer Manual, Tektronix part number 071-1375-xx.
The MTM400 MIB definition files can be downloaded from the MTM400 using
http://address/mib/adsys.mib and http://address/mib/admpeg.mib.
Communities
An SNMP Community String is like a password. It is sent along with each SNMP
request and allows (or denies) access to the MTM400. Most agents accept a default
password of “public”. Alternative community strings can also be used to enhance
security. The MTM400 uses the standard community string “public”. However, it
allows a secondary community string to accommodate older systems that use
different values and cannot be changed. Even if these values are changed, the
“public” community string can still be used. Read and Write community strings
can be set in the Network Settings dialog (see page 3-7).
SNMP Traps
An SNMP Trap is an unsolicited message from an MTM400 to an SNMP agent
that an event has occurred. Traps provide an immediate notification for an event
that might only be discovered during occasional polling using normal SNMP
techniques.
SNMP traps have a default community string of “public”. An alternative
community string can be assigned in the Network Settings dialog (see page 3-7).