Snmp Manager Functions - Cisco 2950 - Catalyst Switch Configuration Manual

Chapter 28 Configuring SNMP
Table 28-1
Table 28-1 SNMP Security Models and Levels
Model Level
SNMPv1 noAuthNoPriv
SNMPv2C noAuthNoPriv
SNMPv3 noAuthNoPriv
SNMPv3 authNoPriv
SNMPv3 authPriv
(requires the
cryptographic software
image)
You must configure the SNMP agent to use the SNMP version supported by the management station.
Because an agent can communicate with multiple managers, you can configure the software to support
communications with one management station using the SNMPv1 protocol, one using the SNMPv2C
protocol and another using SNMPv3.

SNMP Manager Functions

The SNMP manager uses information in the MIB to perform the operations described in
Table 28-2 SNMP Operations
Operation
get-request
get-next-request
get-bulk-request
get-response
set-request
trap
1. With this operation, an SNMP manager does not need to know the exact variable name. A sequential search is performed to
2. The get-bulk command only works with SNMPv2 or later.
78-11380-10
identifies the characteristics of the different combinations of security models and levels.
Authentication
Community string No
Community string No
Username
MD5 or SHA
MD5 or SHA
Description
Retrieves a value from a specific variable.
Retrieves a value from a variable within a table.
2
Retrieves large blocks of data, such as multiple rows in a table, that would
otherwise require the transmission of many small blocks of data.
Replies to a get-request, get-next-request, and set-request sent by an NMS.
Stores a value in a specific variable.
An unsolicited message sent by an SNMP agent to an SNMP manager when some
event has occurred.
find the needed variable from within a table.
Encryption Result
Uses a community string match for authentication.
Uses a community string match for authentication.
No Uses a username match for authentication.
No Provides authentication based on the HMAC-MD5
or HMAC-SHA algorithms.
DES Provides authentication based on the HMAC-MD5
or HMAC-SHA algorithms.
Provides DES 56-bit encryption in addition to
authentication based on the CBC-DES (DES-56)
standard.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Understanding SNMP
Table
1
28-2.
28-3