1. RFC 2571: http://www.ietf.org/rfc/rfc2571.txt

3.1.1.1. snmpEngineID

Within an administrative domain, an snmpEngineID is the unique and unambiguous identifier of an SNMP engine. Since there is a one-to-one association between SNMP engines and SNMP entities, it also uniquely and unambiguously identifies the SNMP entity within that administrative domain. Note that it is possible for SNMP entities in different administrative domains to have the same value for snmpEngineID. Federation of administrative domains may necessitate assignment of new values.

2. net-snmp library: http://net-snmp.sourceforge.net/docs/man/snmpd.conf.html

SNMPv3 requires an SNMP agent to define a unique "engine ID" in order to respond to SNMPv3 requests.

3. Cisco IOS: http://www.cisco.com/en/US/docs/ios/netmgmt/command/reference/nm_20.html

The SNMP engine ID is a unique string used to identify the device for administration purposes.

zalex_ua Added the RFC hyper link to all documentation branches.
Diff is here https://www.zabbix.com/documentation/2.0/manual/config/items/itemtypes/snmp?do=diff&rev2%5B0%5D=1397223343&rev2%5B1%5D=&difftype=sidebyside
RESOLVED.

asaveljevs RFC 2571 is a long document. Perhaps we should mention that the relevant information is in section 3.1.1.1 specifically?

zalex_ua weeeeel, done

asaveljevs Looks good to me. Can be copied to documentation pages for other versions, too.

zalex_ua it was copied to all branches initially.
Ok, CLOSED.