User-Based Security Model - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Information About SNMP

User-Based Security Model

The following table identifies what the combinations of security models and levels mean.
Table 51: SNMP Security Models and Levels
Model
v1
v2c
v3
v3
v3
SNMPv3 User-Based Security Model (USM) refers to SNMP message-level security and offers the following
services:
• Message integrity—Ensures that messages have not been altered or destroyed in an unauthorized manner
OL-16597-01
Level
noAuthNoPriv
noAuthNoPriv
noAuthNoPriv
authNoPriv
authPriv
and that data sequences have not been altered to an extent greater than can occur non-maliciously.
Authentication Encryption
Community string No
Community string No
Username No
HMAC-MD5 or No
HMAC-SHA
HMAC-MD5 or DES
HMAC-SHA
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
User-Based Security Model
What Happens
Uses a community
string match for
authentication.
Uses a community
string match for
authentication.
Uses a username
match for
authentication.
Provides
authentication based
on the Hash-Based
Message
Authentication Code
(HMAC) Message
Digest 5 (MD5)
algorithm or the
HMAC Secure Hash
Algorithm (SHA).
Provides
authentication based
on the HMAC-MD5
or HMAC-SHA
algorithms. Provides
Data Encryption
Standard (DES)
56-bit encryption in
addition to
authentication based
on the Cipher Block
Chaining (CBC)
DES (DES-56)
standard.
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