[c-nsp] Funny problem w/ SFP link on Nexus 5548

[Joshua Atterbury]

Are the NX dual Rate ports? (1/10g) I've had to disable speed autoneg on 3750s when connecting to dual rate ports on nexus using 1gig optics

Sent from my iPhone

On 22/09/2011, at 7:27 AM, <Vinny_Abello at Dell.com> wrote:

> Is Gig-E auto negotiation set the same on both devices? It sounds kind of like the Nortel has Gig-E auto negotiation disabled, so it will show link as soon as it sees light. Your NX might be trying to auto negotiate which won't work if the other side isn't doing it as well. Maybe try disabling auto neg on the NX.
> 
> -Vinny
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Garry
> Sent: Wednesday, September 21, 2011 3:43 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Funny problem w/ SFP link on Nexus 5548
> 
> Hi,
> 
> I'm currently at a customer who got a 5548 with 2248 FEX and several
> 2960S connected to the 5548, everything working fine. Anyway, in order
> to migrate from the old switch infrastructure, we tried to interconnect
> them to the 5548, which is where my problem started - the link just
> won't go up on the NX ...
> The other side is a Nortel core switch, with 8616SXE card for fiber
> links. On the Nortel, the link light goes on when I connect the
> switches, but the Nexus doesn't do anything. SFPs are the same as for
> the links to the 2960S, OEM/compatible 1G optics. Ports are configured
> for 1G ("speed 1000"), same as for the 2960S. When I put the same SFP in
> a 2960S, the link comes up at once.
> What am I missing here?
> 
> Thanks, Garry
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