1000Mbps full-duplex

[claramunt_1]

I need to configure a 10/1000T for 1000Mbps full-duplex on a switch 3400cl series

Port Settings

Port Type | Enabled Mode Flow Ctrl MDI
----- --------- + ------- ------------ --------- ----
5 100/1000T | Yes Auto Disable Auto


I have introduced this command but I have obtained an error:

Switch(config)# int e 5 speed-duplex ?
10-half 10 Mbps, half duplex.
100-half 100 Mbps, half duplex.
10-full 10 Mbps, full duplex.
100-full 100 Mbps, full duplex.
1000-full 1000 Mbps, full duplex.
auto Use Auto Negotiation for speed and duplex mode.
auto-10 10 Mbps, use Auto Negotiation for duplex mode.
auto-100 100 Mbps, use Auto Negotiation for duplex mode.
auto-1000 1000 Mbps, use Auto Negotiation for duplex mode.
Switch(config)# int e 5 speed-duplex 1000-full
Value 1000-full is not applicable to port 5.


Why? Is possible to set a port on this switch to 1000mbps full-duplex?
Thanks in advance.

[rick jones]

While I do see a 1000-full in the listing there, IIRC the gigabit ethernet spec requires autonegotiation to be used. Why do you believe you need to hard-code things to 1000FD?

[claramunt_1]

We've a metrolan link and telco specifications say us that we must set the port to 10/100/1000 full-duplex with autonegotiation disabled.
Since we have a gigabit switch I would like to set the port to 1000FD.

What is IIRC?

[rick jones · Accepted solution]

At the risk of my showing ignorance of some obscure appendix it seems, the telco is running something that isn't compliant with the gigabit ethernet specs. You might want to take them to task for that.

IIRC - If I Recall Correctly

Just to be complete, do you get command errors when you try 100-full?

[claramunt_1]

With 100-full works fine
I agree with you
Thanks

[Holger Hasenaug]

The following is what the IEEE specs say:
All 1000BASE-T PHYs shall provide support for Auto-Negotiation and shall be capable of
operating as MASTER or SLAVE.
...
The primary purpose of Autoneg on 1000Base-T are:
a) To negotiate that the PHY is capable of supporting 1000BASE-T half duplex or full duplex transmission.
b) To determine the MASTER-SLAVE relationship between the PHYs at each end of the link.
--

On some devices on the market you can configure the port for 1000_full but still they do autonegotiation.

I only know about one device on the market where you really can disable Autoneg on 1000Base-T ports. But than you also have to specify which mode the port should run in (master or slave).

[Preston Gallwas]

Yeah AFAIK the only in-spec option 1000-bt is auto-1000

[rick jones]

Perhaps the presence of 1000-full is a bug in the help output then.

[rick jones]

I asked someone I know in ProCurve land, and the response was that indeed 1000-T's spec requires autoneg, the 1000-full is only for 1000 mbps _fibre_ ports and the help software should not have offered that as an option in the context of a 1000-T port.

[stieven struyf]

i have the same problem, we have a recent nokia firewall who only supports full-duplex.
is there any way to force this?

[rick jones]

Seems the best thing to do is take Nokia to task for their out-of-spec device and find one that does things correctly.

[Nikola Kufrin]

You have said:
"The following is what the IEEE specs say:
All 1000BASE-T PHYs shall provide support for Auto-Negotiation and shall be capable of
operating as MASTER or SLAVE."

That does not mean that auto-negotiation should not be settable to OFF. It means only that autonegotiation should be supported for 1000T.

I see that this mail was written in 2006. I have Procurve Switch 3500yl-24G with software release K.12.57. Is there an option now to disable auto-negotiation in some newer release?