topic Fiber connection from switch to server-No Link in Network Architecture & Design

Fiber connection from switch to server-No Link

Rich_Plummer — Thu, 08 Dec 2016 01:18:00 GMT

Hello Everyone,
I have an Enterasys B5K124-48P2 with a FTLX8571D3BCL-EX SR SFP+ module installed in port 49.
On the other end is a Lenovo 650 with an Intel x520 card and an Intel FTLX8571D3BCV-IT module.
I am using MM 50/125 Tripp Lite patch cable.

The switch recognizes the SFP and no issues jump out that I can see. The card in the server appears to be working fine as well. I did manually set the speed on the server card to 10GB instead of Auto.

Added bonus, I'm pretty new to Extreme/Enterasys and my knowledge of fiber is weak.

I'm not getting a link light between the two of them. Windows reports the cable is unplugged, and the switch is giving me "operator down".

Can anyone give me an idea as to what my next steps would be?
Thanks

RE: Fiber connection from switch to server-No Link

Roger_Green — Thu, 08 Dec 2016 01:33:00 GMT

what is your fiber protocol ? LX, SX, etc.

RE: Fiber connection from switch to server-No Link

Rich_Plummer — Thu, 08 Dec 2016 01:33:00 GMT

I "believe" it's SX. Both of those transceivers are the short run over MM. I'm not sure where else I verify that..

RE: Fiber connection from switch to server-No Link

Roger_Green — Thu, 08 Dec 2016 01:33:00 GMT

check the hardware itself. if its SX, make sure both devices run that

RE: Fiber connection from switch to server-No Link

Roger_Green — Thu, 08 Dec 2016 01:34:00 GMT

fiber, sfp protocol

RE: Fiber connection from switch to server-No Link

Rich_Upshaw — Thu, 08 Dec 2016 01:35:00 GMT

I would let your NIC on the server autonegotiate first. It should negotiate at 10G.
I was going to tell you to force the port on the B5 to 10G but I'm not sure you can do that at that rate. I'm only seeing options for 1000.

RE: Fiber connection from switch to server-No Link

Roger_Green — Thu, 08 Dec 2016 01:37:00 GMT

I disagree. auto speed/dupex rarely works. specify on both ends, switch and nic

RE: Fiber connection from switch to server-No Link

Rich_Upshaw — Thu, 08 Dec 2016 01:37:00 GMT

I was referring to his statement that he forced his server NIC to 10G. I'd let it autonegotiate.
Also, how do you force the B switch to 10G full?

RE: Fiber connection from switch to server-No Link

Rich_Plummer — Thu, 08 Dec 2016 01:37:00 GMT

I think that switch only supports 10GB

CHS-MDF-B5(su)->show port status tg.1.49 Alias Oper Admin Speed
Port (truncated) Status Status (bps) Duplex Type
--------- ------------ ------- ------- --------- ------- ------------
tg.1.49 CHS-MDF-710 Down Up 10G full SFP+

RE: Fiber connection from switch to server-No Link

Daniel_Coughlin — Thu, 08 Dec 2016 01:37:00 GMT

The 10g ports on the C5/B5 platforms are fixed. S/K may support both 1g and 10g optics.

RE: Fiber connection from switch to server-No Link

Zdeněk_Pala — Thu, 08 Dec 2016 01:37:00 GMT

Let me correct the post above:
B5K does have two ports fixed 10G.
C5K does have two ports 1G/10G = dual speed. = http://learn.extremenetworks.com/rs/extreme/images/C-Series-DS.pdf

RE: Fiber connection from switch to server-No Link

Daniel_Coughlin — Thu, 08 Dec 2016 01:37:00 GMT

I stand corrected on the C5

RE: Fiber connection from switch to server-No Link

Rich_Upshaw — Thu, 08 Dec 2016 01:52:00 GMT

Roger, might he need to flip the A and B on the fiber strands? Just another thought.

RE: Fiber connection from switch to server-No Link

Roger_Green — Thu, 08 Dec 2016 01:54:00 GMT

valid thought Rich...what is the fiber interface type...I would assume LX connectors, so switch pairs at the LIU

RE: Fiber connection from switch to server-No Link

Rich_Plummer — Thu, 08 Dec 2016 01:54:00 GMT

RE: Fiber connection from switch to server-No Link

Zdeněk_Pala — Thu, 08 Dec 2016 02:43:00 GMT

I would check "loop" connection B5K - transceiver - patch cable - transceiver - B5K. If that works you will know that those components are good. Good luck

RE: Fiber connection from switch to server-No Link

EtherMAN — Thu, 08 Dec 2016 04:38:00 GMT

Just FYI there is no "auto negotiate" for any 10 gig link... Was not part of the standard. Also in our 6000 or so active edge interfaces going to all kinds of network devices and gear on 100/1000 connections Auto-Auto is the best for anything under 5 years old between vendors. We have nore issues with the 5 to 10 % hard coded interfaces not coming up or coming up half duplex due to technician doing the deployment not knowing to hard code or not hard coding it correctly.

RE: Fiber connection from switch to server-No Link

Erik_Auerswald — Thu, 08 Dec 2016 04:38:00 GMT

I would extend the prefer auto-auto time frame to the last ten years, at least. 

RE: Fiber connection from switch to server-No Link

Rich_Upshaw — Thu, 08 Dec 2016 04:42:00 GMT

Good info. It's nice to see a Layer 1 discussion every once in a while 