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SPS208G/SPS224G4/SPS2024 Service Provider Switches User Guide 217
SNMP
The Simple Network Management Protocol
(SNMP) provides a method for
managing network devices. The device supports SNMP v1, v2, and v3.
• SNMP v1 and v2
SNMP agents maintain a list of variables that are used to manage the device.
The variables are defined in the Management Information Base (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 agents are controlled by access
strings.
• SNMP v3
SNMP v3 also applies access control and a new traps mechanism to SNMPv1
and SNMPv2 PDUs. In addition, User Security Model (USM) is defined for
SNMPv3 and includes:
• Authentication — Provides data integrity and data origin authentication.
• Privacy — Protects against disclosure message content. Cipher Bock-
Chaining (CBC) is used for encryption. Either authentication is enabled on an
SNMP message, or both authentication and privacy are enabled on a SNMP
message. However privacy cannot be enabled without authentication.
• Timeliness — Protects against message delay or message redundancy.
The SNMP agent compares the incoming message to the message time
information.
• Key Management — Defines key generation, key updates, and key use. The
device supports SNMP notification filters based on Object IDs (OID). OIDs
are used by the system to manage device features. SNMP v3 supports the
following features:
- Security
- Feature Access Control
- Traps
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