We use a few Juniper EX2300C and recently EX4100-F-12P switches where we have a need. Interesting issue with the EX4100-F-12P, it appears that you can power it over PoE. However, if you power it from a standard power supply you’ll get syslog messages indicating that there is a power supply failure. Junos seems to think because the switch isn’t being powered by PoE that there’s a power supply failure.

Mar 18 16:20:55  EX4100F chassisd[17857]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Power Supply failed (jnxContentsContainerIndex 2, jnxContentsL1Index 1, jnxContentsL2Index 2, jnxContentsL3Index 0, jnxContentsDescr Power Supply 1 @ 0/1/*, jnxOperatingState 6)
Mar 18 16:20:55  EX4100F chassisd[17857]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Power Supply failed (jnxContentsContainerIndex 2, jnxContentsL1Index 1, jnxContentsL2Index 3, jnxContentsL3Index 0, jnxContentsDescr Power Supply 2 @ 0/2/*, jnxOperatingState 6)
Mar 18 17:20:56  EX4100F chassisd[17857]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Power Supply failed (jnxContentsContainerIndex 2, jnxContentsL1Index 1, jnxContentsL2Index 2, jnxContentsL3Index 0, jnxContentsDescr Power Supply 1 @ 0/1/*, jnxOperatingState 6)
Mar 18 17:20:56  EX4100F chassisd[17857]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Power Supply failed (jnxContentsContainerIndex 2, jnxContentsL1Index 1, jnxContentsL2Index 3, jnxContentsL3Index 0, jnxContentsDescr Power Supply 2 @ 0/2/*, jnxOperatingState 6)

We opened a ticket with Juniper and they believe it’s a flaw. Issue is that we monitor over 1,000 switches and we use the syslog feed to create alerts and tickets for review, now we’ve need to build exemptions into our logging to deal with these false positive alerts.

Hopefully Juniper will fix this bug.

Cheers!