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

[Andrew Jones]

>From the cisco nx-os 5.0(3) n2 (1) release notes:

Auto-Negotiation Disable 
Beginning with Cisco NX-OS Release 5.0(3)N2(1), you can disable auto-negotiation on a switch port. This feature allows you to connect devices that do not support auto-negotiation (for example, certain DWDM multiplexers) to a Cisco Nexus 5000 Series switch. 

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release/notes/Rel_5_0_3_N2_1/Nexus5000_Release_Notes_5_0_3_N2.html

________________________________________
From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] On Behalf Of John Gill [johgill at cisco.com]
Sent: Friday, 23 September 2011 3:07 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Funny problem w/ SFP link on Nexus 5548

Good point, Pete - 5.0(2) does not support 1G SFP, but the behavior is
tricky.  The port will link up, but we cannot pass traffic above 256B.
We did not have the proper message to block 1G configuration, so it was
hard to know this isn't supported.

Garry,
"no negotiate auto" would be a good test, so after the upgrade please
let me know.  There are more transceiver outputs we can gather if this
doesn't help.

Regards,
John Gill
cisco


On 9/22/11 7:47 AM, Pete Templin wrote:
>
>> -----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
>>
>> 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 ...
>
> Silly question I'm sure, but are you running NXOS code that supports 1G
> operation? 1G support wasn't in initial code releases, first support
> came around April of this year I think.
>
> pt
>
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