Cisco WS-X6748-SFP Software Guide - Page 641

Chapter 36 Configuring SNMP Understanding SNMP Table 36-1 SNMP Terminology (continued) Term SNMP engine SNMP entity SNMP group SNMP user SNMP view write view Definition A copy of SNMP that can reside on the local or remote device. Unlike SNMPv1 and SNMPv2c, in SNMPv3 the terms SNMP Agents and SNMP Managers are no longer used. These concepts have been combined and called an SNMP entity. An SNMP entity is made up of an SNMP engine and SNMP applications. A collection of SNMP users that belong to a common SNMP list that defines an access policy, in which object identification numbers (OIDs) are both read-accessible and write-accessible. Users belonging to a particular SNMP group inherit all of these attributes defined by the group. A person for which an SNMP management operation is performed. The user is the person on a remote SNMP engine who receives the inform messages. A mapping between SNMP objects and the access rights available for those objects. An object can have different access rights in each view. Access rights indicate whether the object is accessible by either a community string or a user. A view name (not to exceed 64 characters) for each group; the view name defines the list of object identifiers (OIDs) that can be created or modified by users of the group. Understanding SNMP SNMP is an application-layer protocol that facilitates the exchange of management information between network devices. SNMP enables network administrators to manage network performance, find and solve network problems, and plan for network growth. There are three versions of SNMP: • Version 1 (SNMPv1)-This is the initial implementation of SNMP. Refer to RFC 1157 for a full description of functionality. See the "Understanding How SNMPv1 and SNMPv2c Works" section on page 36-5 for more information on SNMPv1. • Version 2 (SNMPv2c)-The second release of SNMP, described in RFC 1902, has additions and enhancements to data types, counter size, and protocol operations. See the "Understanding How SNMPv1 and SNMPv2c Works" section on page 36-5 for more information on SNMPv2. • Version 3 (SNMPv3)-This is the most recent version of SNMP and is fully described in RFC 2571, RFC 2572, RFC 2573, RFC 2574, and RFC 2575. The SNMP functionality on the Catalyst enterprise LAN switches for SNMPv1 and SNMPv2c remain intact; however, SNMPv3 has significant enhancements to administration and security. See the "Understanding SNMPv3" section on page 36-7 for more information on SNMPv3. 78-13315-02 Catalyst 6000 Family Software Configuration Guide-Releases 6.3 and 6.4 36-3