COTSE- TNM Reference

Callback Scripts	Description
%%	Replaced with a single percent.
%V	Replaced with the fully specified varbind list.
%R	Replaced with the request id.
%S	Replaced with the session name.
%E	Replaced with the error status
%I	Replaced with the error index.
%A	Replaced with the IP address of the peer sending the packet.
%P	Replaced with the port number of the peer sending the packet.
%T	Replaced with the SNMP PDU type. Possible values for the PDU type are get, getnext, getbulk, set, response, v1trap, v2trap, inform, or report.

Many SNMP commands described below allow you to invoke asynchronous SNMP operations.

Asynchronous SNMP operations work by sending out a request without waiting for a response. The SNMP protocol engine keeps track of asynchronous requests and processes callback scripts once an answer for an asynchronous request is received or the request times out.

The callback script is always evaluated at global level. Special % escape sequences can be used in the callback script to access details contained in the SNMP response. These % escape sequences are substituted before the callback script is evaluated.

The substitution depends on the character following the %, as defined in the list above.

Possible values for the error status (%E) are:

noError

tooBig

noSuchName

badValue

readOnly

genErr

noAccess

wrongType

wrongLength

wrongEncoding

wrongValue

noCreation

inconsistentValue

resourceUnavailable

commitFailed

undoFailed

authorizationError

notWritable

inconsistentName

noResponse

endOfWalk.

The last two error codes are generated internally by the protocol engine when a request times out or when the end of an asynchronous walk has been reached.

The error index identifies the element in the varbind list which caused an error. The index uses the Tcl list numbering scheme where 0 refers to the first element of the list. This is different from the SNMP numbering scheme, where the first list element has the index value 1. The %I escape sequence will be replaced by -1 if the error status is noError.


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