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Why do I have to move a cable from one port to another on my managed switch?

Posted on 2013-01-12
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Last Modified: 2013-01-13
I am trying to get my network to be stable for long periods of time. Every once-in-a-while, usually after I have made some configuration change elsewhere in the network, one or other of the ports on the switch become unresponsive so that the device connected to it cannot get an IP address. The problem is then solved by moving the Ethernet cable to a different port. This never happened with a dumb switch. Do these ports have some kind of "memory" that gets messed up?


Setup:
TP-Link  TL-SG3216 managed switch
various other devices and PC's
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Question by:Jeff swicegood
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by:John Hurst
ID: 38770979
Port memory would seem unusual in any switch.

1. Is this one switch? Or does it happen to more than one?
2. Can you reset the switch to factory setup?  Does that help?

... Thinkpads_User
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by:Jeff swicegood
ID: 38770993
1. Yes, I only have one managed switch. And it only happens on that one.
2. Yes I did reset the switch. That was Tuesday. I haven't had a problem since then. Maybe that cleared everything out. I thought maybe ports over time become associated with particular mac addresses and when something goes wrong with that they stop transmitting.
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John Hurst earned 500 total points
ID: 38770996
It could be that one device is doing too much broadcasting. It also could be that the switch became overloaded with overall traffic. If someone is downloading or sending big videos, for example, that could represent a lot of traffic.

If a reset solves it, great. If it starts to happen more frequently, you may need a higher capacity switch.

.... Thinkpads_User
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by:John Hurst
ID: 38771002
@Jagadguru - Thank you, and I was happy to help. I wish you good luck with your Switch.

... Thinkpads_User
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by:Fred Marshall
ID: 38771269
The ARP table is a kind of "port memory".
But it would be unusual for it to cause problems unless:

If you have say 2 devices with the same IP address and one is normally powered up and the other is normally powered down.  This might be done to provide a backup device.

- THEN you try out the backup and switch the power on both.

This introduces a new MAC address for the same IP address.
Sometimes it clears up rapidly and sometimes not.
So, sometimes it will appear that things aren't working; at least for a whiel.
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by:Jeff swicegood
ID: 38772150
Thanks! I think that is what is happening.  Sometimes I plug in a new device that is identical to one I have on the network, not knowing that they both have the same IP (the default one). I guess it takes some time for the switch to recover from that.
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