Re: SNMP Data Collection on ifIndex > 2^31

David Hustace <[email protected]> Mon, 29 Oct 2018 20:16:16 -0500

Newsgroups	gmane.network.opennms.general
Message-ID	<[email protected]>

> On Oct 29, 2018, at 19:41, Ian MacDonald <[email protected]> wrote:
> 
> The CPE access interfaces however have much higher ifIndex numbers (seen in snmpwalk immediately below) which appear as negative integers as the ifIndex

From the RFC it seems index values are to be non-negative so I'm assuming that's making the underlying protocol library (SNMP4J) very unhappy and the manager (OpenNMS) is calling "no joy".

RFC 1212

   If the INDEX clause is not present, and the object type corresponds
   to a non-columnar object, then instances of the object are identified

SNMP Working Group                                              [Page 8]
RFC 1212                Concise MIB Definitions               March 1991

   by appending a sub-identifier of zero to the name of that object.
   Further, note that if the MIB module does not contain a textual
   description of how instance identification information is derived for
   columnar objects, then the INDEX clause must be present.

   To define the instance identification information, determine which
   object value(s) will unambiguously distinguish a conceptual row.  The
   syntax of those objects indicate how to form the instance-identifier:

          (1)  integer-valued: a single sub-identifier taking the
               integer value (this works only for non-negative
               integers);

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