JUNIPER-MAC-MIB

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › JUNIPER-MAC-MIB

Organization: Juniper Networks, Inc.

Last Updated: 2003-07-18

Category: Technology: Bridging, Technology: Switching/L2, Vendor: Juniper

Description: Defines managed objects for MAC address table management and statistics on Juniper Networks EX-series Ethernet switches.

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What Is JUNIPER-MAC-MIB?

JUNIPER-MAC-MIB is a Juniper Networks enterprise MIB implementing Ethernet MAC address table management and statistics for Juniper EX-series switches. It is designed to expose data about the switch's learned MAC address table and associated per-port or per-VLAN Ethernet statistics. Its monitoring value centers on software/hardware status of the Layer 2 forwarding plane, such as MAC address table population, aging, and Ethernet-level statistics that can reveal MAC table churn, flooding, or capacity issues on a switch. As an Ethernet-focused MIB it likely complements the standard BRIDGE-MIB and dot1dTpFdbTable concepts, though no explicit standards dependency is stated beyond it being Juniper's enterprise-specific implementation. It is deployed on Juniper EX-series Ethernet switches in campus and data-center access/aggregation layers. Engineers can download the JUNIPER-MAC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in JUNIPER-MAC-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • Juniper Networks EX-series Ethernet switches

Monitoring Examples

No sample object names were provided for this module, so specific table or column names cannot be confirmed from source; the module description only indicates it covers Ethernet MAC statistics. In a realistic deployment an administrator would expect to poll MAC address table size and per-port MAC learning statistics to detect MAC flooding or table exhaustion on an EX-series switch, but naming exact objects here would be speculative given the lack of grounding data.

This MIB depends on

Related MIBs

Imported Objects

From IF-MIB

ifIndexOBJECT-TYPE

From JUNIPER-SMI

jnxMibsOBJECT-IDENTITY

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using jnxMacHCInOctets OID:

Select a Juniper Networks EX-series Ethernet switch (MAC address table/statistics) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type jnxMacHCInOctets into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of total octets received in this VLAN/MAC Address. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Juniper Ethernet MAC statistics for VLAN-based source MAC address accounting.

Start monitoring Juniper Networks EX-series Ethernet switch (MAC address table/statistics) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download JUNIPER-MAC-MIB