Nexus 93216TC-FX2 FAN BEHAVIOR

[Daniel Blanco]

Good Morning !!

We have installed a pair of Nexus 93216TC-FX2 . Doing tests for hardware resiliency, we removed a fan and we observed ports located in the module that fan was removed don´t working. After insert the fan the ports worked fine. We think it is a normal behavior but we are not completely sure. Does someone if it is correct or by the other hand could be a issue ?

Thank you very much !!

[Giuseppe Larosa]

Hello @Daniel Blanco ,

being a fixed model

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/datasheet-c78-742282.html

I think that if you remove the FAN after some seconds the whole device should shut down in order  to protect itself from overheating.

Can you connect a laptop to the console and see the log messages during the test?

if the system goes down when you insert the FAN again it should take some time to restart.

Or do you mean that as soon as you remove the FAN the ports go down ?

Hope to help

Giuseppe

[Daniel Blanco]

Hi Giuseppe,

The fan was out several minutes. We removed the fan connected in the middle switch. The only ports that didn´t work are located int he middle module. We connected a laptop and we can see windows network up, but in the switch (link not connect). Connecting the laptop in other module worked fine even with the fan (in the middle) removed. For better understanding :

fan removedports failed

Thank you very much,

[marce1000]

 - As stated followup on console output when doing this and or issue the command show logging as to what the devices decides to do or is doing.

 M.

[Daniel Blanco]

Hi,

This is the output extracted during the tests :

2020 Jun  3 13:07:54 SWITCH2 %ETHPORT-5-IF_ADMIN_UP: Interface Ethernet1/23 is admin up .
2020 Jun  3 13:08:32 SWITCH2 %ETHPORT-5-SPEED: Interface Ethernet1/23, operational speed changed to 1 Gbps
2020 Jun  3 13:08:32 SWITCH2 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/23, operational duplex mode changed to Full
2020 Jun  3 13:08:32 SWITCH2 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/23, operational Receive Flow Control state changed to off
2020 Jun  3 13:08:32 SWITCH2 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/23, operational Transmit Flow Control state changed to off
2020 Jun  3 13:08:32 SWITCH2 %ETHPORT-5-IF_UP: Interface Ethernet1/23 is up in Layer3
2020 Jun  3 13:10:47 SWITCH2 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/23 is down (Link failure)
2020 Jun  3 13:13:13 SWITCH2 %PLATFORM-2-FAN_REMOVED: Fan module 3 (Serial number ) Fan3(sys_fan3) removed
2020 Jun  3 13:16:34 SWITCH2 %PLATFORM-5-FAN_DETECT: Fan module 3 (Serial number ) Fan3(sys_fan3) detected
2020 Jun  3 13:16:34 SWITCH2 %PLATFORM-5-FAN_STATUS: Fan module 3 (Serial number ) Fan3(sys_fan3) current-status is FAN_OK
2020 Jun  3 13:16:34 SWITCH2 %PLATFORM-2-FANMOD_FAN_OK: Fan module 3 (Fan3(sys_fan3) fan) ok

The test was done with eth1/23. The FAN was removed during the tests. When the FAN worked the interface was up. The rest of the interfaces out of this module was working fine.

Thank you very much,

KR,