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FAQ: SNMP Interaction with Juniper Networks Devices

By Erdem posted 02-01-2016 12:45


SNMP enables you to monitor network devices from a central location. Many network management systems (NMS) are based on SNMP, and support for this protocol is a key feature of most network devices.


Juniper Networks provides many different platforms that support SNMP on Junos OS. Junos OS includes an onboard SNMP agent that provides remote management applications with access to detailed information about the devices on the network.


Junos OS supports:

  • version 1 (SNMPv1)
  • version 2 (SNMPv2c)
  • version 3 (SNMPv3)

By default, SNMP is disabled on a Juniper Networks device. To enable and configure SNMP, click Configuring SNMP on devices running Junos OS.


SNMP implementation in Junos OS uses a master SNMP agent (known as an SNMP process or snmpd) that resides on the managed device. Various subagents reside on different modules of Junos OS as well (such as the Routing Engine), and these subagents are managed by the snmpd.


The SNMP process opens two additional ports (sockets): one for IPv4 and one for IPv6. This enables the SNMP process to send traps.


 To ramp up on SNMP implementation in Junos OS, click Understanding SNMP implementation in Junos OS.


This article provides answers to the most common questions about how SNMP interacts with Juniper Networks devices.


  1. How frequently should a device be polled?
  2. I am unable to perform a MIB walk on the ifIndex. Why is this?
  3. I see SNMP_IPC_READ_ERROR messages when the SNMP process restarts on my system and also during Routing Engine switchover. Is this acceptable?
  4. What is the source IP address used in the response PDUs for SNMP requests? Can this be configured?