topic RE: Port bounces up and down once after reboot: X670G2-48x-4q in ExtremeSwitching (EXOS/Switch Engine)

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

Anders_Sjökvist — Thu, 24 Nov 2016 18:10:00 GMT

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

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

Naresh — Thu, 24 Nov 2016 18:36:00 GMT

Hi Anders,

What is the device connected to the ports 9 and 10?
How often the ports are flapping?
Are the ports 9 and 10 are part of a Link Aggregation Group?
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

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

Anders_Sjökvist — Thu, 24 Nov 2016 18:48:00 GMT

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.

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

Karthik_Mohando — Thu, 24 Nov 2016 19:18:00 GMT

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.

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

Anders_Sjökvist — Thu, 24 Nov 2016 20:32:00 GMT

Thanks for your reply we will continue to trouble-shoot here and if appreciate that you look arount for a simular case.
BR

Anders

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

Karthik_Mohando — Mon, 28 Nov 2016 12:17:00 GMT

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.

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

Drew_C — Fri, 16 Dec 2016 23:27:00 GMT

Hello Anders,
Have you been able to resolve this problem?

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

dong_zhenghao — Thu, 29 Jun 2017 18:08:00 GMT

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