JUNIPER-EX-MAC-NOTIFICATION-MIB :: jnxHistMacChangedMsg

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › JUNIPER-EX-MAC-NOTIFICATION-MIB › jnxHistMacChangedMsg

jnxHistMacChangedMsg

Module: JUNIPER-EX-MAC-NOTIFICATION-MIB

OID (symbolic): JUNIPER-EX-MAC-NOTIFICATION-MIB::jnxHistMacChangedMsg

OID (numeric): 1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8.1.2

Node type: OBJECT-TYPE

Type: OCTET STRING

Access: read-only

Description: This object contains the information of a MAC change notification event. It consists of several tuples packed together in the format of '...'. Each tuple consist of 13 octets in the format of '' where is of size 1 octet and supports the following values 0 - End of MIB object. 1 - MAC learnt. 2 - MAC removed. 3 - MAC updated. is VLAN number of the VLAN which the MAC address is belonged to and has size of 2 octet. is the Layer2 Mac Address and has size of 6 octets. is the value of dot1dBasePort for the interface from which the MAC address is learnt and has size of 4 octets.

What is jnxHistMacChangedMsg?

This is a packed binary record of one or more MAC-change events, each 13-octet tuple encoding the operation, learned, removed, or updated, along with the VLAN, the MAC address, and the dot1dBasePort involved. Because it's a compact binary blob rather than plain text, a management application must parse it according to the documented tuple format to extract which MAC addresses changed, on which VLAN and port. A monitoring tool might decode one tuple as operation 1, learnt, VLAN 10, MAC 00:1A:2B:3C:4D:5E, port 3, telling the admin exactly which device just appeared on which switch port.

Examples

Walk all instances (SNMPv2c):

snmpwalk -v2c -c public <target> 1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8.1.2
snmpwalk -v2c -c public <target> JUNIPER-EX-MAC-NOTIFICATION-MIB::jnxHistMacChangedMsg

Get a specific instance (index 1):

snmpget -v2c -c public <target> 1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8.1.2.1
snmpget -v2c -c public <target> JUNIPER-EX-MAC-NOTIFICATION-MIB::jnxHistMacChangedMsg.1

Start monitoring Juniper EX-series Ethernet switch (MAC address notification) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the JUNIPER-EX-MAC-NOTIFICATION-MIB::jnxHistMacChangedMsg OID value, configure state conditions and alerts, and monitor any Juniper EX-series Ethernet switch (MAC address notification) from a single console.

OID Breakdown

Upper-level ancestors (11 from the standard OID tree / other modules)
Numeric OIDNameModule
1isoLANART-AGENT
1.3orgAirPair-MIB
1.3.6dodAirPair-MIB
1.3.6.1internetAirPair-MIB
1.3.6.1.4privateAirPair-MIB
1.3.6.1.4.1enterprisesAirPair-MIB
1.3.6.1.4.1.2636juniperMIBJUNIPER-SMI
1.3.6.1.4.1.2636.3jnxMibsJUNIPER-SMI
1.3.6.1.4.1.2636.3.40jnxExMibRootJUNIPER-SMI
1.3.6.1.4.1.2636.3.40.1jnxExSwitchingJUNIPER-EX-SMI
1.3.6.1.4.1.2636.3.40.1.7jnxMacNotificationRootJUNIPER-EX-SMI
Numeric OIDNameModule
1.3.6.1.4.1.2636.3.40.1.7.1jnxMacNotificationMIBJUNIPER-EX-MAC-NOTIFICATION-MIB
1.3.6.1.4.1.2636.3.40.1.7.1.1jnxMacNotificationMIBObjectsJUNIPER-EX-MAC-NOTIFICATION-MIB
1.3.6.1.4.1.2636.3.40.1.7.1.1.1jnxMacNotificationMIBGlobalObjectsJUNIPER-EX-MAC-NOTIFICATION-MIB
1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8jnxMacHistoryTableJUNIPER-EX-MAC-NOTIFICATION-MIB
1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8.1jnxMacHistoryEntryJUNIPER-EX-MAC-NOTIFICATION-MIB
1.3.6.1.4.1.2636.3.40.1.7.1.1.1.8.1.2jnxHistMacChangedMsgJUNIPER-EX-MAC-NOTIFICATION-MIB

Module

This MIB depends on