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Flapping ports on 4000m and 4140gl switches

 
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Wojciech Furmankiewicz_1
Occasional Contributor

Flapping ports on 4000m and 4140gl switches

Hello,

My customer has a problem with flapping ports.

I 05/09/05 07:53:34 ports: port C6 is now off-line
I 05/09/05 07:53:37 ports: port C6 is now on-line
I 05/09/05 07:55:29 ports: port D3 is now off-line
I 05/09/05 07:55:31 ports: port D3 is now on-line
... and the same for almost all interfaces.

There are two switches connected together: 4000m and 4140gl.
Some vlans are configured.
The firmware is current on both.
All the links are configured for 100FDx on both sides.
LACP was disabled on all interfaces.

Does anybody have and idea what can cause that problem?

Thanks in advance for help !
Wojtek
16 REPLIES 16
Les Ligetfalvy
Esteemed Contributor
Solution

Re: Flapping ports on 4000m and 4140gl switches

Are these switch to switch connections or end device connections on the edge?
Wojciech Furmankiewicz_1
Occasional Contributor

Re: Flapping ports on 4000m and 4140gl switches

The flapping ports are connected to the end devices - PCs
Les Ligetfalvy
Esteemed Contributor

Re: Flapping ports on 4000m and 4140gl switches

Try newer drivers and turn off power management. Worked for me.

Re: Flapping ports on 4000m and 4140gl switches

I've been struggling with HP with the same issue on 2650's for more than half a year. We've disabled DHCP, STP, LACP, IGMP and so on which has made absolutely no difference.
It occurs on all ports whether connected to Intel, Realtek and Broadcom NICs, so I'm pretty confident that it's a switch issue.
However, HP believes it to be driver problems or faulty cabling...
With all the different types of NICs and driver versions we have, I'm pretty sure that there would have been a couple of computers that didn't exhibit this problem, but there isn't...

Regards,
S├Г┬╕r
Wojciech Furmankiewicz_1
Occasional Contributor

Re: Flapping ports on 4000m and 4140gl switches

Hi Soren,

Thanx for your reply.
Did you finally found the clue?
What was it?
Or do you still have the problem.
Do you think replacing the switch will solve the problem?

Best Regards,
Wojtek
Les Ligetfalvy
Esteemed Contributor

Re: Flapping ports on 4000m and 4140gl switches

I had an issue with a 2848 that was toggling ports and newer code on the switch fixed that. I also have seen toggling on my 5308xl from two separate causes.

One cause was marginal jumpers. The patch cords were over-crimped, resulting in the contacts being too deep between the insulating spacers. This caused the spring pressure on the contacts to be diverted to the spacers instead. I have been replacing them whenever I encounter the toggles.

The second cause I attribute to drivers and power management settings. I had a few PCs toggling and when I updated the drives and turned off power management, they ceased to toggle.
Stuart Teo
Trusted Contributor

Re: Flapping ports on 4000m and 4140gl switches

i experienced flapping between a 4000m and some workstations. i never found out why. i only know that when i nailed both ends at 10hdx, they stopped flapping. :(
If a problem can be fixed, there's nothing to worry. If a problem can't be fixed, worrying ain't gonna help. Bottom line: don't worry.
Les Ligetfalvy
Esteemed Contributor

Re: Flapping ports on 4000m and 4140gl switches

I had one user plug a paper shredder into the same powerbar as his PC and every time he shredded documents, the switch port his PC was connected to would toggle.
Stuart Teo
Trusted Contributor

Re: Flapping ports on 4000m and 4140gl switches

sounds like harmonic distortions!

get a filter! :)
If a problem can be fixed, there's nothing to worry. If a problem can't be fixed, worrying ain't gonna help. Bottom line: don't worry.