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тАО02-26-2006 11:34 PM
тАО02-26-2006 11:34 PM
Switch port not Auto Negotiating
I have a small issue with 1 port in a 4108gl switch.
The switch is using J4862A 24 port 10/100 modules.
On port G24, the switch will only communicate with the host (My laptop) when set to Speed-duplex 100-full. For some reason it will not auto negotiate. All of the other ports on the switch are set to the default Auto.
Any one seen this before? I have tried other devices and it will not auto negotiate with anything so its not the fault of the laptop.
Cheers
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тАО02-27-2006 01:08 AM
тАО02-27-2006 01:08 AM
Re: Switch port not Auto Negotiating
it may be a faulty port on that module.
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тАО02-27-2006 01:19 AM
тАО02-27-2006 01:19 AM
Re: Switch port not Auto Negotiating
Did you check the settings on the switch to make sure auto is not turned off for that port?
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тАО02-27-2006 02:06 AM
тАО02-27-2006 02:06 AM
Re: Switch port not Auto Negotiating
We have also the last port on a module (B24) connected to Procurve 2650 port 49 (that other 10/100/1G one), and after upgrading firmware on both switches (H8.86 now on 2650) the link would not come up, although both ends were forced 100FD, which did work with previous firmwares. It has been working only after setting port 49 to Auto-100 and B24 to Auto.
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тАО02-27-2006 12:38 PM
тАО02-27-2006 12:38 PM
Re: Switch port not Auto Negotiating
Autoneg has to be on on _both_ sides.
Some boilerplate:
$ cat usenet_replies/duplex
How Autoneg is supposed to work:
When both sides of the link are set to autoneg, they will "negotiate" the duplex setting and select full duplex if both sides can do full-duplex.
If one side is hardcoded and not using autoneg, the autoneg process will "fail" and the side trying to autoneg is required by spec to use half-duplex mode.
If one side is using half-duplex, and the other is using full-duplex, sorrow and woe is the usual result.
So, the following table shows what will happen given various settings on each side:
Auto Half Full
Auto Happiness Lucky Sorrow
Half Lucky Happiness Sorrow
Full Sorrow Sorrow Happiness
Happiness means that there is a good shot of everything going well.
Lucky means that things will likely go well, but not because you did anything correctly :) Sorrow means that there _will_ be a duplex mis-match.
When there is a duplex mismatch, on the side running half-duplex you will see various errors and probably a number of late collisions. On the side running full-duplex you will see things like FCS errors.
Note that those errors are not necessarily conclusive, they are simply indicators.
Further, it is important to keep in mind that a "clean" ping (or the like - eg "linkloop") test result is inconclusive here - a duplex
mismatch causes lost traffic _only_ when both sides of the link try to speak at the same time. A typical ping test, being synchronous, one at a time request/response, never tries to have both sides talking at the same time.
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тАО03-02-2006 07:30 PM
тАО03-02-2006 07:30 PM
Re: Switch port not Auto Negotiating
Cheers for the info, When i tested it both sides were set to auto negotiate. The port will still only work if the switch is set to 100-full. I am not too worried about it though as the connection does work...
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тАО03-06-2006 09:04 AM
тАО03-06-2006 09:04 AM
Re: Switch port not Auto Negotiating
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тАО03-06-2006 07:01 PM
тАО03-06-2006 07:01 PM
Re: Switch port not Auto Negotiating
The cable appears to be fine, If i use it in another port it negotiates without a problem. If i plug another computer into port 24 with a differnet NIC then it fails to negotiate!
I am the only device on that switch with the Driver/NIC combo i have as mine is just a laptop that i use for maintenance, all of the other devices are desktop PC's. I have never had a problem auto negotiating on any of the switches that we have at the college until this one!
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тАО03-07-2006 05:15 AM
тАО03-07-2006 05:15 AM
Re: Switch port not Auto Negotiating
There is I suppose still the chance that it is firmware related, but I would have expected that to afect all ports not a specific port.
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тАО03-07-2006 07:28 PM
тАО03-07-2006 07:28 PM