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snmp get vbl [script]

The snmp# get session command retrieves the list of instances as specified in the varbind list vbl by using an SNMP get-request. 

If the get session command contains a callback script, then the command sends the get-request and returns immediately. 

The result is the request id for the asynchronous request. The get session command is processed synchronously if the callback script is absent. In this case, the received varbind list is returned. 

The command fails with a Tcl error if the agent does not respond or if a protocol error happens.

Below is an example for a synchronous get request to retrieve some variables of the system group. The Tcl catch command is used to handle any errors:
 

set vbl {SNMPv2-MIB!sysDescr.0\
    SNMPv2-MIB!sysName.0}
set err [catch {$s get $vbl} vbl]
if {$err == 0} {
    puts $vbl
 }


The code below implements the same get request with an asynchronous get request:

set vbl {SNMPv2-MIB!sysDescr.0\
    SNMPv2-MIB!sysName.0}
$s get $vbl {
    if {”%E” == “noError”} { 
        puts “%V” 
    }
}


 

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