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Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
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Chapter27 Configuring SNMP Understanding SNMP
Table27-1 identifies the characteristics of the different combinations of security models and levels.
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 using SNMPv1, SNMPv2C, or SNMPv3.
SNMP Manager Functions
The SNMP manager uses information in the MIB to perform t he o pe rat ions des cr ibed in Table 27-2.
Table27-1 SNMP Security Models and Levels
Model L evel Authentication Encryption Result
SNMPv1 noAuthNoPriv Community string No Uses a community string match for authentication.
SNMPv2C noAuthNoPriv Community string No Uses a community string match for authentication.
SNMPv3 noAuthNoPriv Username No Uses a username match for authentication.
SNMPv3 authNoPriv MD5 or SHA No Provides authentication based on the HMAC-MD5
or HMAC-SHA algorithms.
SNMPv3 authPriv
(requires the
cryptographic software
image)
MD5 or SHA 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.
Table27-2 SNMP Operations
Operation Description
get-request Retrieves a value from a specific variable.
get-next-request Retrieves a value from a variable within a table.1
1. With this operation, an SNMP manager does not need to know the exact variable name. A sequential search is performed to
find the needed variable from within a table.
get-bulk-request2
2. The get-bulk command only works with SNMPv2 or later.
Retrieves large blocks of data, such as multiple rows in a table, that would
otherwise require the transmission of many small blocks of data.
get-response Replies to a get-request, get-n ext-reque st, an d set-r eque st se nt by a n NMS.
set-request Stores a value in a specific variable.
trap An unsolicited message sent by an SNMP agent to an SNMP manager when some
event has occurred.