JUNOS SNMP Agent Features

The JUNOS SNMP agent software consists of an SNMP master agent that delegates all SNMP requests to subagents. Each subagent is responsible for the support of a specific set of MIBs.

The JUNOS software supports the following versions of SNMP:

• SNMPv1—The initial implementation of SNMP that defines the architecture and framework for SNMP.
• SNMPv2c—The revised protocol, with improvements to performance and manager-to-manager communications. Specifically, SNMPv2c implements community strings, which act as passwords when determining who, what, and how the SNMP clients can access the data in the SNMP agent. The community string is contained in SNMP Get, GetBulk, GetNext, and Set requests. The agent may require a different community string for Get, GetBulk, and GetNext requests (read-only access) than it does for Set requests (read-write access).
• SNMPv3—The most up-to-date protocol focuses on security. SNMPv3 defines a security model, user-based security model (USM), and a view-based access control model (VACM). SNMPv3 USM provides data integrity, data origin authentication, message replay protection, and protection against disclosure of the message payload. SNMPv3 VACM provides access control to determine whether a specific type of access (read or write) to the management information is allowed.

In addition, the JUNOS SNMP agent software accepts IPv4 and IPv6 addresses for transport over IPv4 and IPv6. For IPv6, the JUNOS software supports the following IPv6 over SNMP:

• SNMP data over IPv6 networks
• IPv6-specific MIB data
• SNMP agents for IPv6