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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...
Since the bad cable was found I have not seen anymore port flapping. Strange that it affected several ports
Hi Dave40,
Kindly answer the questions below:
a. Was the GS510TLP switch working fine before?
b. Does all the ports flap even before you updated the firmware and factory reset the GS510TLP switch?
c. How is everything connected? It would be best if you post an image or screenshot of your detailed network setup.
Regards,
DaneA
NETGEAR Community Team
a) So the switch is new and I had no issues prior to the switch install. Was using a GS108T
b) never tried the default factory firmware. It is still available on image2 and is 6.6.2.6. On installation I updated the firmware and configured the settings. I ran it for about a month and observed this port flapping and TCP connection failure issues across all devices - I've been too busy to fix. I will attempt to try the factory firmware after a few more days of testing.
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.
Yesterday, I disabled the SNTP (made it local time) and lo and behold the mental time checks (every few seconds and sporadically in bursts) have stopped (obviously, because it's now off) but also the port flapping appears much reduced and possibly cured. I won't declare it solved yet as 1 days isn't suffient in my eyes. So I'll monitor. If I confirm SNTP issue then I'll report back - I'll also try the 6.6.2.6 to see if the problem exists there.
Changes from DEFAULT config is that I disable STP, set SNTP to 0.uk.pool.ntp.org
Have tried: IGMP OFF (think it was on but also had the problem before I turned that off), ARP renew is now OFF but had the issue before this was changed .
I have just noticed that DNS is enabled but no DNS server entered. I can't remember if I had this set before with SNTP. I have factory reset a few times since. Anyway, SNTP with no DNS server (but set to enabled) was the last known config that was causing this issue (with STP off also).
I must clarify the amount the SNTP I had in the logs = it was sincerily a lot of entries. I was only able to supply a small snapshot due to the character limits on the forum. It was sporadic but with entries of 10-20 every few seconds. Polling was very high despite successfully updating time and resolving the DNS supplied. (probably without the DNS servers specified - really can't remember setting this)
I just want to follow-up on this. Were you able to perform a factory reset on the GS510TLP switch? If yes, are the ports still flapping?
Regards,
DaneA
NETGEAR Community Team- I disconnected the GS510TLP and subbed in another spare GS108T I have. At the moment, I haven't noticed any issues with the two GS108T switches.
Before I did that, I activated the GS510 factory firmware with reset to defaults and that appeared to work just fine.
My next step is to go back to the GS510, make sure factory firmware is ok and move on to the latest firmware again and try that.
Although the issue was usually apparent in a short space of time, I did see it more frequently in sporadic patches. At the time, the GS510 reported that one of my devices was pushing out incorrect bpdu messages and that it, the GS510, was rejecting them. Very odd as I was sure all STP and BPDU forwarding and checking was switched off. I don't like to post hearsay so let's forget about that until I get hard facts.
I found a bad cable connector (a fact) that might be PART of the original problem but I'm sure it would account for 50% of the issues at most (again hearsay).
What I found most strange as a software developer myself was that the settings on one firmware were the same for the newer firmware. As in...... 1 settings memory and 2 firmware memories. So a factory reset of the settings would have to be done in the firmware intended for use to ensure all the default values were captured.Hi Dave40,
Please only connect GS510TLP with PC, not connect with other device, keep your switch with default configuration(except for enable memory log severity filter as Debug) on v6.6.2.9, to check switch port will flap or not? If still flap, please give the time and frequency, logs.
Regards,
NETGEAR Employee.
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