Dell PowerConnect 7024 User Manual - Page 314
What Are SNMP Traps?, Authentication or Privacy Keys are modified in the SNMPv3 User Security
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The SNMP agent maintains a list of variables that are used to manage the switch. The variables are defined in the 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 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-BockChaining (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. Authentication or Privacy Keys are modified in the SNMPv3 User Security Model (USM). What Are SNMP Traps? SNMP is frequently used to monitor systems for fault conditions such as temperature violations, link failures, and so on. Management applications can monitor for these conditions by polling the appropriate OIDs with the get command and analyzing the returned data. This method has its drawbacks. If it is done frequently, significant amounts of network bandwidth can be consumed. If it is done infrequently, the response to the fault condition may not occur in a timely fashion. SNMP traps avoid these limitations of the polling method. An SNMP trap is an asynchronous event indicating that something significant has occurred. This is analogous to a pager receiving an important message, except that he SNMP trap frequently contains all the information needed to diagnose a fault. 314 Configuring SNMP
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1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234