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Question

Port bounces up and down once after reboot: X670G2-48x-4q


After reboot of the switch some port are bouncing up and down one time. We don't see any reason for this and it's causing traffic loss for us.

11/16/2016 13:19:22.61 [i] Port 49 link UP at speed 40 Gbps and full-duplex
11/16/2016 13:19:20.21 [i] Port 10 link UP at speed 10 Gbps and full-duplex
11/16/2016 13:19:20.21 [i] Port 9 link UP at speed 10 Gbps and full-duplex
11/16/2016 13:19:20.58 [i] Port 9 link down - Local fault
11/16/2016 13:19:21.49 [i] Port 10 link down - Local fault
11/16/2016 13:19:24.75 [i] Port 10 link UP at speed 10 Gbps and full-duplex
11/16/2016 13:19:24.75 [i] Port 9 link UP at speed 10 Gbps and full-duplex
11/16/2016 13:19:33.11 [i] Port 49 link down - Local fault
11/16/2016 13:19:35.93 [i] Port 49 link UP at speed 40 Gbps and full-duplex

Is this some known behaviour or do anyone have a idea what could cause such behaviour.

If you wonder we are running test activitys within mobile networks and this is part of some testcases.

7 replies

Userlevel 4
Hi Anders,
  1. What is the device connected to the ports 9 and 10?
  2. How often the ports are flapping?
  3. Are the ports 9 and 10 are part of a Link Aggregation Group?
  4. What is the Exos version running on the switch?
For more information on the fault detection process please use below link to find the article:

https://gtacknowledge.extremenetworks.com/articles/Q_A/what-is-the-difference-between-local-fault-an...

To isolate the issue with layer 1 please check below steps:
  • Please reseat the SFP module and check the status.
  • Please move the problematic links to another port to see whether ports are still flapping or not.
  • Please check for any errors on the port using the command “# show port rx errors” and “# show port tx errors”.
  • Please check the same in other end of the device connected to the ports 9 and 10
Sorry if was a bit vague in my question. 🙂

Connected are ericsson telecom equipment under test.

The ports only bounces up and down one time after reboot of the switch.
Port 9-10 is a LACP LAG.
EXOS 16.1.3.6

And we dont know if it's the switch causing the problem, it can just as well be a problem in the other end but as it's only ocures after the reboot of the extreme-switch we started to look there.
Userlevel 6
Andres, I guess the switches are not in production, so in case if you can change the configuration and reboot the switch at will then i would suggest to isolate the issue with below steps. remove the ports 9,10 from all the VLAN's loop back the ports 9 and 10 using the same cable used in port 9 or port 10. reboot the switch and see if the ports are flapping. Try the same on the Telecom equipment. This could give a fair idea where the issue is. I would get back if i find any such case is recorded before.
Thanks for your reply we will continue to trouble-shoot here and if appreciate that you look arount for a simular case.
BR

Anders
Userlevel 6
Anders, I checked the database and and could not find a similar issue reported. Still i would wait for others to comment in case if i missed any similar instances.
Userlevel 7
Hello Anders,
Have you been able to resolve this problem?
Hi
I have the same problem again, the bouncing ports are:
1.isc ports connected to peer switch;
2.the ports connected to HP GEN7 Host (EXSI).

(No STP running.)

Is it maybe because the extreme switch port is 10G FULL DUPLEX, and EXSI side is AUTO-Negotiation?

Thanks.

BR
Dong

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