Verilink PRISM 3030 (34-00208.L) Product Manual - Manual (Page 127)

Definition of Traps 117
Definition of
Traps Verilink products with SNMP support provide for the detection and reporting of
network alarms. When an alarm occurs, the SNMP agent sends a trap message
(formatted per RFC 1157) to multiple destinations on the user’s network. The
generic trap type is enterpriseSpecific (generic-trap = 7).
Network problems often cause more than one alarm type. In this case, multiple
trap messages are generated, each with a different specific-trap type.
Some alarm types do not apply to certain products.
The Trap-PDU has six mandatory fields as shown in the lower level of Figure C-1.
The Enterprise field is composed of the Object Identifier of the MIB branch
containing the trap definitions. Returns { 1.3.6.1.4.1.425.4 } { txport traps }.
The Agent Address Field is the agent’s IP address unit. This further identifies the
trap sender to the NMS receiving the trap.
The Generic Trap field contains an integer value that represents one of the standard
predefined traps for SNMP.
The Specific Trap field contains trap values defined for a particular enterprise. The
values in this field are defined in the txport.mib and the following tables. The list
is broken down in specific sections to group trap definitions by use.
The Time Stamp field contains the time the trap was generated in the form of time
ticks that have elapsed since the agent was initialized. The value is in units of
hundredths of a second. ifIndex is typically provided in the Variable Binding List.
The Variable Bindings List contains supplemental implementation information
when included in the Trap-PDU.
✍
PDU Tag PDU Length PDU Field Value
Enterprise Time Stamp Generic Trap # Agent Address VarBindList Specific Trap #
Figure C-1 Trap-PDU Format