[c-nsp] disabling GigE negotiation on NX-OS

[Keegan Holley]

I don't think fiber negotiates.  It isn't usually capable of anything but gig-full.  Are you sure the carrier is using 1g fiber.  Carriers are always provisioning 100m smf interfaces for low-cap connections if you don't tell them otherwise.  I had a few customers get bitten by this.

Sent from my iPhone

On Apr 15, 2011, at 2:07 PM, Gert Doering <gert at greenie.muc.de> wrote:

> Hi,
> 
> yesterday, one of our customers tried to move two GigE-on-fiber circuits 
> from a Catalyst 4507 to a new Nexus 5548.
> 
> The other end terminates on some carrier gear (and is then multiplexed
> in whatever ways across the city).
> 
> After moving the circuit, the link didn't come up on the Nexus, but
> the carrier gear *did* show link.  I wasn't on-site, so I couldn't
> investigate myself, but it smells very much like "GigE link negotiation
> being disabled on the carrier gear" - carriers love that.
> 
> Of course we do not have access to either the Catalyst nor the Nexus,
> but it's "our duty" to "make it work" (after all, we provide the fiber
> patches!).  So I'd like him to test disabling link negotiation on the
> Nexus, but don't know how to do that - no access to any NX-OS gear yet.
> 
> On CatOS, this is "set port negotiation x/y disable".  
> 
> On IOS, it's "int giga x/y / speed nonegotiate".
> 
> --> How to do it on NX-OS?
> 
> http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4_0_1a/BasicEthernet.html
> 
> refers to "Layer 1 autonegotiation", but no word on turning it off...
> 
> gert
> -- 
> USENET is *not* the non-clickable part of WWW!
>                                                           //www.muc.de/~gert/
> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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