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Implementing SNMP
combination of a security model and a security level will determine which security mechanism is employed
when an SNMP packet is handled. See
security levels available in SNMPv3. The SNMPv3 feature supports RFCs 3411 to 3418.
You must configure the SNMP agent to use the version of SNMP supported by the management station. An
agent can communicate with multiple managers; for this reason, you can configure the Cisco IOS-XR software
to support communications with one management station using the SNMPv1 protocol, one using the SNMPv2c
protocol, and another using SMNPv3.
Comparison of SNMPv1, v2c, and v3
SNMP v1, v2c, and v3 all support the following operations:
• get-request—Retrieves a value from a specific variable.
• get-next-request—Retrieves the value following the named variable; this operation is often used to
retrieve variables from within a table. With this operation, an SNMP manager does not need to know
the exact variable name. The SNMP manager searches sequentially to find the needed variable from
within the MIB.
• get-response—Operation that replies to a get-request, get-next-request, and set-request sent by an NMS.
• set-request—Operation that stores a value in a specific variable.
• trap—Unsolicited message sent by an SNMP agent to an SNMP manager when some event has occurred.
Table 8: SNMPv1, v2c, and v3 Feature Support, on page 65
by the SNMP v1, v2c, and v3.
Table 8: SNMPv1, v2c, and v3 Feature Support
Feature
Get-Bulk Operation
Inform Operation
64 Bit Counter
Textual Conventions
Authentication
Privacy (Encryption)
Authorization and Access
Controls (Views)
Table 9: SNMP Security Models and Levels, on page 66
SNMP v1
No
No
No
No
No
No
No
System Management Configuration Guide for the Cisco NCS 6000 Series Router, Release 5.0.x
identifies other key SNMP features supported
SNMP v2c
SNMP v3
Yes
Yes
Yes (No on the
Yes (No on the
Cisco IOS XR software)
Cisco IOS XR software)
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
SNMP Versions
for a list of
65
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