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Auto Negotiation

Posted: Mon Sep 10, 2012 6:28 pm
by hkd
Gigabit speed only be set to auto-negotiation ?

If I off the auto-negotiation and force to 1g, i cant connect to the routerboard.

Can connect with 100M with auto-negotiation off
Can't connect with 1G with auto-negotiation off
With Auto-negotiation on, it go 1G

tested with 3 difference computer and 5 cat5,cat6 cable.

It happen on ALL PORT on RB1100ahx2 ver 5.20


Is this normal ???

Re: Auto Negotiation

Posted: Mon Sep 10, 2012 7:05 pm
by dog
Why would you even want to disable it?

90% of times I have seen networks with major performance problems it was because someone decided it was clever to turn off auto-negotiation.

Re: Auto Negotiation

Posted: Tue Sep 11, 2012 1:27 am
by lambert
Maybe so he can talk to ISPs like AT&T. They force me to disable auto negotiation on my Opt-E-MAN 1GB fiber service.

Re: Auto Negotiation

Posted: Tue Sep 11, 2012 5:47 am
by hkd
I decide to disable the auto-negotiation
because of i have my routerboard frequently ETHERNET Link up/down on connected port.

I changed with 5 difference cable and computer.

It happen frequently every day, as i see in this forum, someone who say he can fix by turn off auto-negotiation.
That's why i try to disable it.

Re: Auto Negotiation

Posted: Tue Sep 11, 2012 10:08 am
by janisk
GBit interfaces require auto-negotiation to work properly, as there are a lot more stuff that is negotiated compared to fast ethernet ports.

fibre ports are completely different story to copper.