NX-OS speed nonegotiate command

[Jeremy Waldrop]

I am trying to connect an fiber connection to a service provider for a L2 trunk back to another site. It is MM fiber connecting to a Nexus 7010 1G SFP SX.

The provider it telling us that it will only work if we set the speed nonegotiate command under the interface. NX-OS doesn't have such a command so we tried to hard set the speed/duplex. This doesn't work and we don't even get a link light.

If we connect it to a Catalyst 2960 SX SFP it works fine.

any ideas?

[Prashanth Krishnappa]

Looks like Nexus 7k does not have this capability. But in my experience, configuring "speed nonegotiate" on one side(2960 in this case), should bring the link up if speed/duplex is configured on the other side. Does this not work for you?

[Jeremy Waldrop]

No, this does not work for us. The other side of the link is the providers switch (I think it is a Lucent). Then at the other site where the link connects we have a Catalyst that works and it is set to "speed nonegotiate".

If we connect the site with the Nexus to a Catalyst it works but only if the speed nonegotiate command is there.

On the Nexus we have tried to leave it set to auto and forcing it but the link never comes up. We have a TAC case open and they are telling us the option will be added in a future update.

Weird thing is that when you force the speed/duplex and issue a show interface it states that auto-negotiation is disabled. I guess that isnt't the same as speed nonegotiate though.

This is very strange and the customer has threatened to yank the Nexus out and put in something else.

[Lucien Avramov]

This is a software roadmap item on N7K and should be coming soon. You have this feature today on Nexus 5000 and Nexus 3000 series.