Dell PowerConnect 6248 User's Guide - Page 218

Defining SNMP Parameters Simple Network Management Protocol (SNMP) provides a method for managing network devices. The device supports SNMP version 1, SNMP version 2, and SNMP version 3. NOTE: By default, SNMPv2 is automatically enabled on the device. To enable SNMPv3, a local engine ID must be defined for the device. The local engineID is by default set to the switch MAC address, however when the switch operates in a stacking mode, it is important to manually configure the local engineID for the stack. This local engineID must be defined so that it is unique within the network. It is important to do this because the default engineID in a stack is the MAC address of the master unit, which may change if the master unit fails and another unit takes over the stack. For information on how to configure the local engine ID, see "SNMP Global Parameters." SNMP v1 and v2 The SNMP agent maintains a list of variables, which are used to manage the device. The variables are defined in the Management Information Base (MIB). The MIB presents the variables controlled by the agent. The SNMP agent defines the MIB specification format, as well as the format used to access the information over the network. Access rights to the SNMP agent are controlled by access strings. SNMP v3 SNMP v3 also applies access control and a new traps mechanism to SNMPv1 and SNMPv2 PDUs. In addition, the User Security Model (USM) is defined for SNMPv3 and includes: • Authentication - Provides data integrity and data origin authentication. • Privacy - Protects against disclosure of message content. Cipher-Bock-Chaining (CBC) is used for encryption. Either authentication is enabled on an SNMP message, or both authentication and privacy are enabled on an SNMP message. However privacy cannot be enabled without authentication. • Timeliness - Protects against message delay or message redundancy. The SNMP agent compares incoming message to the message time information. • Key Management - Defines key generation, key updates, and key use. The device supports SNMP notification filters based on Object IDs (OID). OIDs are used by the system to manage device features. SNMP v3 supports the following features: • Security • Feature Access Control • Traps Authentication or Privacy Keys are modified in the SNMPv3 User Security Model (USM). Use the SNMP page to define SNMP parameters. To display the SNMP page, click System →SNMP in the tree view. SNMP Global Parameters Use the Global Parameters page to enable SNMP and Authentication notifications. 218 Configuring System Information