The authors tell me that the ASN.1 has not changed from RFC 2511.Presumably they meant "in a significant way"; the ASCII -> UTF8 change probably does count as a change. Changing the name of an OID is not legal in SNMP; I have no idea what the rules are for this. (This document renames { id-regInfo 1 } from id-regInfo-asciiPairs to id-regInfo-utf8Pairs). (see http://irg.attlabs.net/~fenner/2511bis.html ) Bill