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

[Chuck Church]

Anything showing up in the Cisco log?  I'm not sure about the 5548, but on
the 5010/5020s, only certain ports will do both 1 gig and 10 gig.  Not sure
if a non-1 gig capable port would accept the speed 1000 command.  Those
symptoms sound like the speed 1000 is actually missing.  Do the SPFs on each
side have matching wavelength?


Thanks,

Chuck

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
Vinny_Abello at Dell.com
Sent: Wednesday, September 21, 2011 5:28 PM
To: gkg at gmx.de; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Funny problem w/ SFP link on Nexus 5548

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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