Forum Discussion

Aspirant

Jun 25, 2018

Solved

GS510TLP Port flapping

So had a similar issue with a GS108T where the ports would flap down then up repeatedly causing internet to break. The GS510TLP has been updated to latest 6.6.2.9 firmware and RESET to DEFAULTS (whi...

Firmware

Dave40
Jul 06, 2018
Since the bad cable was found I have not seen anymore port flapping. Strange that it affected several ports

Dave40

Aspirant

Jul 06, 2018

These:

<11> Jan 1 00:19:36 192.168.50.233-1 DOT1S[dtlTask]: dot1s_txrx.c(269) 2293 %% dot1sBpduReceive(): Discarding the BPDU, since it is an invalid BPDU type

<13> Jan 1 00:19:36 192.168.50.233-1 DOT1S[dtlTask]: dot1s_txrx.c(1246) 2292 %% dot1sBpduReceive(): Invalid Forward Delay

<11> Jan 1 00:19:35 192.168.50.233-1 DOT1S[dtlTask]: dot1s_txrx.c(269) 2291 %% dot1sBpduReceive(): Discarding the BPDU, since it is an invalid BPDU type

<13> Jan 1 00:19:35 192.168.50.233-1 DOT1S[dtlTask]: dot1s_txrx.c(1246) 2290 %% dot1sBpduReceive(): Invalid Forward Delay

Those are from the Sky Q router.

Test method:

I disconnected everything. All that was plugged in was GS510 and my PC and cleared log and no new message.

I connected Sky Q to port 1 and the BPDU messages flood in. So Edimax wifi wasn't the source - even though it is putting out STP frames?

Dave40

Aspirant

Jul 06, 2018

Since the bad cable was found I have not seen anymore port flapping. Strange that it affected several ports

Dave40

Aspirant

Jul 16, 2018

Confirmed the port flapping was a bad connector plug. I've not had any issues since I re-seated the plug. Plan to fully rewire and remove the plug and socket sometime soon.

Anyway, never had a reply concerning the spanning tree mystery. I still have that but it doesn't cause any issues.

There are 21x spanning tree topo change received messages with a link down /up on g3.

So whenever g3 goes down up then I get the same pattern. How do I find out which device is Unit 1?

53	Jul 13 20:40:21 2018	Spanning Tree Topology Change Received: MSTID: 0 g3
54	Jul 13 20:40:19 2018	Spanning Tree Topology Change Received: MSTID: 0 g3
55	Jul 13 20:39:49 2018	Spanning Tree Topology Change Initiated: 0, Interface: g3
56	Jul 13 20:39:49 2018	Spanning Tree Topology Change: 0, Unit: 1
57	Jul 13 20:39:48 2018	Link Up: g3
58	Jul 13 20:39:45 2018	Unit 1 elected as the new STP root
59	Jul 13 20:39:45 2018	Link Down: g3

DaneA
NETGEAR Employee Retired
Jul 18, 2018
Dave40,

Are you seeing this log on the GS510TLP switch? If yes, what is the device connected to port 3?

c) Internet Sky Q => GS108T (now swapped for an old FS105 dumb switch 100MB) => GS510TLP => Computer, WiFi, TV etc

I've had everything disconnected apart from the FS105, Sky Q and the GS510TLP and WiFi and the problem is still there with this new switch - it was not there before I bought it.

This is the network setup you mentioned before. If ever FS105 switch is still the switch connected to the GS510TLP, it seems that STP is not needed because the FS105 does not support STP. Kindly try to disable STP on the GS510TLP switch and observe.

Regards,

DaneA

NETGEAR Community Team