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Appendix A. Understanding SNMP
61202052L1-1 TSU 120 User Manual
A-3
Trap
This is an unsolicited message issued by a network device to
report an operational anomaly or an alarm condition to the net-
work manager.
These messages are typically encased within informational
packets and transported over the LAN or WAN (wide area net-
work).
TSU 120 SNMP Access
By default, SNMP MIB Browser access to the TSU 120 IP
address with the configured community names, accesses the
host. The TSU 120 can also act as an SNMP proxy agent for
external units. To access MIB variables on externally chained
devices, append a period and the Unit ID of the device to the
Read and Read/Write community names. For example, if the
Read community name configured in the TSU 120 is
public
,
specifying
public.3
as the community name in the SNMP MIB
Browser allows reading SNMP MIB variables from externally
chained unit with a Unit ID of
3
.
If the external unit's passcode is not the default, an entry must
be added to the Unit Access Table for
SNMP MIB
access. See
the Unit Access Table on page 8-5, for more information. How-
ever, SNMP traps for the unit can be forwarded without the
entry.