http://www.rfc-editor.org/rfc/rfc1908.txt
RFC 1908: Coexistence between Version 1 and Version 2 of the Internet-standard Network Management Framework, J. Case, K. McCloghrie, M. Rose, S. Waldbusser1996-01-01T23:00:00-00:00The purpose of this document is to describe coexistence between version 2 of the Internet-standard Network Management Framework [1-6], termed the SNMP version 2 framework (SNMPv2), and the original Internet- standard Network Management Framework (SNMPv1). [STANDARDS-TRACK]