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SNMP, BootP, BootP/DHCP Relay, and DHCP Server Concepts
SNMP Trap Format
Some third-party network management applications, such as NetExpert,
OpenView, and SunNet, let you trigger an operation when a specific SNMP trap is
received. This section describes the SNMP trap format.
The router platform transmits a Nortel Networks event log trap as a 32-bit value as
follows:
•
Octets 1 and 2 (the most significant 16 bits) of the specific trap ID contain
values of 1 and 0, respectively, to identify a Nortel Networks event log trap.
•
Octet 3 of the specific trap ID contains a code that identifies the software
entity that generated the trap.
•
Octet 4 of the specific ID contains the event code that, in conjunction with the
entity code, uniquely identifies the event.
Each 32-bit value is accompanied by three variable bindings that convey the event
string that describes the trap condition, the slot that hosts the entity that generated
the trap, and the trap severity (see Table 2-1).
Thresholds
SNMP uses a management information base (MIB) to manage the router. The
MIB includes an extensive collection of statistics (MIB variables) that track the
router’s performance and provide early warnings of abnormal operating
conditions.
With the Site Manager threshold feature, you can configure the agent to
automatically notify you when specific statistics (or instances of the variable)
reach certain levels.
You can set a threshold for any integer, counter, gauge, or time-tick variable in the
MIB. Using the threshold parameters, you:
•
Select the polling interval, which specifies how often the agent checks the
statistic to see whether its value has reached the threshold.
•
Set three threshold values (high, medium, and low).
•
Specify the threshold action as Lessthan or Greaterthan.
For information about setting thresholds, see “Configuring Thresholds” on
page 3-31.
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