Description

On EX series switch or QFX series switch, unused vme interface might be flapped like UP to DOWN unexpectedly when changing config. If you change the config not related to vme or no physical activity on management cable, there is a possibility of a software bug.
PR1609838 fixed this issue and you can try the fixed version if you are using one of affected versions.

Symptoms

On EX/QFX switch, unused vme interface might be UP and DOWN when changing config. Here is the sample logs. 
Sep 23 19:24:21.589 2023  Switch mib2d[8967]: %DAEMON-5-SNMP_TRAP_LINK_UP: ifIndex 35, ifAdminStatus up(1), ifOperStatus up(1), ifName vme
Sep 23 19:24:21.589 2023  Switch mib2d[8967]: %DAEMON-4-SNMP_TRAP_LINK_DOWN: ifIndex 35, ifAdminStatus up(1), ifOperStatus down(2), ifName vme
Even after disabled vme interface, you may get this log when changes config.

Solution

There is no functional impact by this issue since the issue is seen only when vme interface is DOWN state. 
PR1609838 fixed this issue and you can try fixed version if you could see similar issue.
https://prsearch.juniper.net/#!/search?page=prcontent&id=PR1609838

Modification History

2023-12-01 : Article Created