Switching

Hi Everyone,
I'm seeing a persistent issue across an EX Virtual Chassis where the PoE management bus seems to be locking up, causing brief (approx. 5-second) WiFi drops for users.
The Symptoms:
Frequent logs: CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status.
Critical errors: PoE: Failed to read voltage measurements.
Impact: APs seem to "hiccup." While show poe interface shows the ports as "ON," users are being dropped briefly, suggesting a micro-power cycle when the management bus resets.
Troubleshooting done: Multiple cold power drains (60+ seconds) haven't cleared it. Attempts to upgrade PoE firmware fail/show as incompatible/corrupted.
Sample Logs:
fpc1 PoE: Failed to read voltage measurements
fpc3 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 26-36 [4]
fpc0 PoE: Failed to read voltage measurements

fpc4 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 0-10 [1]
fpc5 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 11-21 [2]
Has anyone seen these CMQFX_POE_ARG3_ERR errors specifically leading to drops? Is this a known I2C bus hang or am I looking at multiple FPC hardware failures?

Have your tried disconnecting the APs, then check logs, could be backfeeding, which could damage the the POe Controller

Hi Annie,

I'm seeing a similar issue on an ex3400 virtual chassis. Were you able to find any solutions?

Jul 24 03:18:00  TelephoneRM-EX3400 dc-pfe[20592]: PoE: Failed to read voltage measurements
Jul 24 03:18:00  TelephoneRM-EX3400 fpc0 PoE: Failed to read voltage measurements
Jul 24 04:32:01  TelephoneRM-EX3400 dc-pfe[20592]: CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 0-10 [1]
Jul 24 04:32:01  TelephoneRM-EX3400 fpc0 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 0-10 [1]
Jul 24 05:18:13  TelephoneRM-EX3400 fpc1 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 37-47 [5]
Jul 24 05:18:28  TelephoneRM-EX3400 fpc1 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 37-47 [5]
Jul 24 05:24:59  TelephoneRM-EX3400 fpc1 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 22-25 [3]
Jul 24 06:58:09  TelephoneRM-EX3400 fpc1 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 22-25 [3]
Jul 24 06:58:21  TelephoneRM-EX3400 dc-pfe[20592]: CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 26-36 [4]
Jul 24 06:58:21  TelephoneRM-EX3400 fpc0 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 26-36 [4]
Jul 24 07:33:18  TelephoneRM-EX3400 fpc1 CMQFX_POE_ARG3_ERR: PoE: poe_get_status: Failed to get interfaces status port group 11-21 [2]