This article explains the alarm, 'Management2 Ethernet Link Down' , its impact, and how to clear the alarm.
'Management2 Ethernet Link Down'
root@router> show chassis alarms 4 alarms currently active Alarm time Class Description 2021-10-19 05:31:51 UTC Major FPC Management2 Ethernet Link Down
Management interfaces are the primary interfaces for accessing the device remotely. Typically, a management interface is not connected to the in-band network but is connected instead to the device's internal network. Through a management interface, you can access the device over the network using utilities such as ssh and telnet and configure the device from anywhere, regardless of its physical location. SNMP can use the management interface to gather statistics from the device.
(em2) is an SFP management port or secondary management interface. It raises an alarm when the link is down. Earlier, no alarm was raised when em2 (secondary interface) goes down.
This behavior changed starting in Junos OS Release 17.4R1. The secondary interface (em2) raises an alarm when the link goes down.
user@host# run show chassis alarms 3 alarms currently active Alarm time Class Description 2017-09-12 23:41:20 PDT Major FPC Management2 Ethernet Link Down root@router> show interfaces terse | match em Interface Admin Link Proto Local Remote em0 up up em0.0 up up inet 10.85.172.99/25 em1 up up em1.32768 up up inet 192.168.1.2/24 em2 up down
To clear the alarm, make sure the cable is connected to the em2 interface and the link status is up/up. If em2 is not in use, the alarm can be ignored by adding the following configuration to the device.
set chassis alarm management-ethernet link-down ignore