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Understanding the Implementation of SNMP on the QFabric System

SNMP monitors network devices from a central location. The QFabric system supports the basic SNMP architecture of Junos OS, but its implementation of SNMP differs from that of other devices running Junos OS. This topic provides an overview of the SNMP implementation on the QFabric system.

As in other SNMP systems, the SNMP manager resides on the network management system (NMS) of the network to which the QFabric system belongs. The SNMP agent resides in the QFabric Director software and is responsible for receiving and distributing all traps as well as responding to all the queries of the SNMP manager. For example, traps that are generated by a Node device are sent to the SNMP agent in the Director software, which in turn processes and sends them to the target IP addresses that are defined in the SNMP configuration.

Note:

In its SNMP implementation, the QFabric system acts as an SNMP proxy server, and requires more time to process SNMP requests than a typical Junos OS device does. The default timeout setting on most SNMP client applications is 3 seconds, which is not enough time for the QFabric system to respond to SNMP requests, so the results of your mibwalk command may be incomplete. For this reason, we recommend that you change the SNMP timeout setting to 5 seconds or longer for the QFabric system to complete the responses to your requests.

Support for SNMP on the QFabric system includes:

  • Support for the SNMP Version 1 (v1) and v2.

    Note:

    Only SNMPv2 traps are supported on the QFabric system.

  • Support for the following standard MIBs:

    • RFC 1155, Structure and Identification of Management Information for TCP/IP-based Internets

    • RFC 1157, A Simple Network Management Protocol (SNMP)

    • RFC 1212, Concise MIB Definitions

    • RFC 1213, Management Information Base for Network Management of TCP/IP-Based Internets: MIB-II (partial support, including the system group and interfaces group)

    • RFC 1215, A Convention for Defining Traps for use with the SNMP

    • RFC 1901, Introduction to Community-based SNMPv2

    • RFC 1905, Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)

    • RFC 1907, Management Information Base for Version 2 of the Simple Network Management Protocol (SNMPv2)

    • RFC 2011, SNMPv2 Management Information Base for the Internet Protocol Using SMIv2

    • RFC 2012, SNMPv2 Management Information Base for the Transmission Control Protocol Using SMIv2

    • RFC 2013, SNMPv2 Management Information Base for the User Datagram Protocol Using SMIv2

    • RFC 2233, The Interfaces Group MIB Using SMIv2

    • RFC 2571, An Architecture for Describing SNMP Management Frameworks (read-only access) (excluding SNMPv3)

    • RFC 2572, Message Processing and Dispatching for the Simple Network Management Protocol (SNMP) (read-only access) (excluding SNMPv3)

    • RFC 2576, Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework (excluding SNMPv3)

    • RFC 2578, Structure of Management Information Version 2 (SMIv2)

    • RFC 2579, Textual Conventions for SMIv2

    • RFC 2580, Conformance Statements for SMIv2

    • RFC 2665, Definitions of Managed Objects for the Ethernet-like Interface Types

    • RFC 2863, The Interfaces Group MIB

    • RFC 3410, Introduction and Applicability Statements for Internet Standard Management Framework (excluding SNMPv3)

    • RFC 3411, An Architecture for Describing Simple Network Management Protocol (SNMP) Management Framework (excluding SNMPv3)

    • RFC 3412, Message Processing and Dispatching for the Simple Network Management Protocol (SNMP) (excluding SNMPv3)

    • RFC 3413, Simple Network Management Protocol (SNMP) Applications (excluding SNMPv3)

    • RFC 3416, Version 2 of the Protocol Operations for the Simple Network Management Protocol (SNMP)

    • RFC 3417, Transport Mappings for the Simple Network Management Protocol (SNMP)

    • RFC 3418, Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)

    • RFC 3584, Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework (excluding SNMPv3)

    • RFC 4188, Definitions of Managed Objects for Bridges

    • RFC 4293, Management Information Base for the Internet Protocol (IP)

    • RFC 4363b, Q-Bridge VLAN MIB

  • Support for the following Juniper Networks enterprise-specific MIBs:

    • Chassis MIB (mib-jnx-chassis.txt)

    • Class-of-Service MIB (mib-jnx-cos.txt)

    • Configuration Management MIB (mib-jnx-cfgmgmt.txt)

    • Fabric Chassis MIB (mib-jnx-fabric-chassis.txt)

    • Interface MIB Extensions (mib-jnx-if-extensions.txt)

    • Power Supply Unit MIB (mib-jnx-power-supply-unit.txt)

    • QFabric MIB (mib-jnx-qf-smi.txt)

    • Utility MIB (mib-jnx-util.txt)

  • Support for operational mode commands—Limited to the show snmp statistics command. You may issue other SNMP requests, including get, get next, and walk requests, by using external SNMP client applications.