Using the SNMP Utilities

4.2 Using the Trap Sender and Trap Receiver Programs

enterprise - 1.2.3

agent address - 6.20.208.53

trap type - Enterprise-specific (6) enterprise-specific value - (33) timeticks - 100

4.2.2 Entering Commands for the Trap Receiver Program

The trap receiver program lets you listen for, receive, and display SNMP trap messages. Until interrupted, the program continues to listen on the specified port.

If you enter commands using the default port number or another privileged port number, you must run the program from a privileged account.

To run the trap receiver program, do the following:

1.Define a foreign command for the program:

$ snmp_traprcv == "$SYS$SYSTEM:TCPIP$SNMP_TRAPRCV"

Alternatively, you can run SYS$MANAGER:TCPIP$DEFINE_ COMMANDS.COM to define all the foreign commands available with TCP/IP Services.

2.Enter a command using the following format: snmp_traprcv [-d][-tcp][-pport]

4.2.2.1Trap Receiver Flags

Table 4–6 describes the snmp_traprcv flags.

Table 4–6 snmp_traprcv Command Flags

Flag

Description

-d

Displays a hexadecimal and formatted dump of the received packet.

-pport

Specifies the port number on the local host on which to listen for trap

 

messages. The default is 162.

-tcp

Listens on the TCP port instead of the UDP (default) port. Reads only

 

a single PDU on an established connection, which is similar to the

 

behavior using UDP.

 

 

4.2.2.2 Setting Up an SNMP Trap Service

To set up an SNMP trap service for use with the trap receiver program, enter a management command in the following format:

SET SERVICE SNMP-TRAP /PROTOCOL=UDP /USER_NAME=TCPIP$SNMP

/PROCESS_NAME=TCPIP$SNMP-TRAP /FILE=TCPIP$SYSTEM:TCPIP$SNMP-TRAP.COM

In this command, port 170 is used as an alternative for port 162, and traps that are received on port 162 are ignored.

If you omit the /PROTOCOL qualifier or you use /PROTOCOL=TCP, the service uses the TCP transport. In this case, when you enter a command to run the trap receiver program, you must include the -tcpflag.

With the SNMP trap service in place, the trap receiver program queries the service for the port number instead of using the default port 162. If you specify a privileged port number (less than 1024) with the /PORT qualifier, make sure you install the trap receiver program with privileges, or run the program from an

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Compaq AAR04BCTE manual Entering Commands for the Trap Receiver Program, Trap Receiver Flags, Snmptraprcv Command Flags

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