# Adjacent Gaudi2 Interface flapping when I shutdown Gaudi2 port

**URL:** https://forum.habana.ai/t/adjacent-gaudi2-interface-flapping-when-i-shutdown-gaudi2-port/1407
**Category:** System Setup
**Created:** [December 3, 2024, 9:27am UTC](https://forum.habana.ai/t/adjacent-gaudi2-interface-flapping-when-i-shutdown-gaudi2-port/1407 "2024-12-03T09:27:00Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![kk2hgo](https://avatars.discourse-cdn.com/v4/letter/k/e95f7d/32.png) [@kk2hgo](https://forum.habana.ai/u/kk2hgo)
#### Post date: [December 3, 2024, 9:27am UTC](https://forum.habana.ai/t/adjacent-gaudi2-interface-flapping-when-i-shutdown-gaudi2-port/1407/1 "2024-12-03T09:27:00Z")

</div>

I am building Gaudi2 GPU server with Cisco Nexus 9000 switches. N9K-C9364D-GX2A  
Our qualification test requires port flap.  
When I shutdown a switch port or Gaudi port, adjacent port is flapping.  
I shut down enp77s0d22 port on Gaudi2, adjacent ports, enp77s0d23, enp78s0d23, enp51s0d23, enp52s0d23 are going down after 4 sec and keep flapping over 10 min.

ciscouser@gaudi-2-17:~$ sudo ifconfig enp77s0d22 down  
ciscouser@gaudi-2-17:~$ sudo cat /var/log/syslog  
Nov 25 20:51:47 gaudi-2-17 kernel: [993970.165603] habanalabs 0000:4d:00.0 enp77s0d22: port was closed  
Nov 25 20:51:47 gaudi-2-17 systemd-networkd[2524]: enp77s0d22: Link DOWN  
Nov 25 20:51:47 gaudi-2-17 systemd-networkd[2524]: enp77s0d22: Lost carrier  
Nov 25 20:51:48 gaudi-2-17 kernel: [993970.564085] habanalabs 0000:4e:00.0 enp78s0d22: link down, port 22  
Nov 25 20:51:48 gaudi-2-17 kernel: [993970.567763] habanalabs 0000:33:00.0 enp51s0d22: link down, port 22  
Nov 25 20:51:48 gaudi-2-17 kernel: [993970.570084] habanalabs 0000:34:00.0 enp52s0d22: link down, port 22  
Nov 25 20:51:48 gaudi-2-17 systemd-networkd[2524]: enp78s0d22: Lost carrier  
Nov 25 20:51:48 gaudi-2-17 systemd-networkd[2524]: enp51s0d22: Lost carrier  
Nov 25 20:51:48 gaudi-2-17 systemd-networkd[2524]: enp52s0d22: Lost carrier  
Nov 25 20:51:52 gaudi-2-17 systemd-networkd[2524]: enp51s0d23: Lost carrier  
Nov 25 20:51:52 gaudi-2-17 systemd-networkd[2524]: enp52s0d23: Lost carrier  
Nov 25 20:51:52 gaudi-2-17 systemd-networkd[2524]: enp52s0d23: Gained carrier  
Nov 25 20:51:52 gaudi-2-17 systemd-networkd[2524]: enp51s0d23: Gained carrier  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.097544] habanalabs 0000:33:00.0 enp51s0d23: link down, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.097628] habanalabs 0000:34:00.0 enp52s0d23: link down, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.099416] habanalabs 0000:34:00.0 enp52s0d23: link up, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.099454] habanalabs 0000:33:00.0 enp51s0d23: link up, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.294416] habanalabs 0000:33:00.0 enp51s0d23: link down, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.329076] habanalabs 0000:4d:00.0 enp77s0d23: link down, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.332900] habanalabs 0000:4e:00.0 enp78s0d23: link down, port 23  
Nov 25 20:51:52 gaudi-2-17 kernel: [993975.338943] habanalabs 0000:34:00.0 enp52s0d23: link down, port 23  
Nov 25 20:51:53 gaudi-2-17 systemd-networkd[2524]: enp51s0d23: Lost carrier  
Nov 25 20:51:53 gaudi-2-17 systemd-networkd[2524]: enp77s0d23: Lost carrier  
Nov 25 20:51:53 gaudi-2-17 systemd-networkd[2524]: enp78s0d23: Lost carrier  
Nov 25 20:51:53 gaudi-2-17 systemd-networkd[2524]: enp52s0d23: Lost carrier

What else I can check to find why PORT 23 is flapping when port22 is shutdown?