I know- this is an interesting issue. We have swapped out SFP's, switches and switch ports with the same result three times- SFP's seemingly failed and on both ends. We put a replacement in one end- nothing until we replaced the other end. It really is stretch for me to believe that we are burning out SFP's. Without knowing what is going on, I fully expect them to fail again- and our replacements aren't here yet.
On Fri, Nov 10, 2017 at 4:05 PM, Micheal Espinola Jr < [email protected]> wrote: > I'm certainly no expert on this tech, but I've never heard of a situation > like this or can I fathom how SFPs could be damaged like this. But the > coincidental recurring circumstance? Fascinating! > > I wonder what other commonalities could possibly be involved. > > -- > Espi > > > On Fri, Nov 10, 2017 at 12:41 PM, Dave Eldridge <[email protected]> > wrote: > >> wow you got me. >> I could see a gbic going bad on one side, but not propagating to the >> other side and taking it out also. >> >> On Fri, Nov 10, 2017 at 12:18 PM, CSSU NetAdmin <[email protected]> >> wrote: >> >>> Once failed, the GBIC's do not work- we swapped them all over. We >>> cleaned all connections and have patch cable replacements on order. They >>> did give us a copy of the certification report- it looks clean. The only >>> reason we put in the 1 GB gbic's is because we don't have 10 GB's spares >>> anymore. I am worried that the 1 GB's will fail too in a week or so. >>> >>> On Fri, Nov 10, 2017 at 12:59 PM, Eldridge, Dave <[email protected]> >>> wrote: >>> >>>> So it failed, you replaced with 10gb gbics and it worked for a short >>>> period and it failed again and only now works at 1gb? >>>> >>>> Just curious if these “failed” gbics work in other fiber runs/switches >>>> of yours. >>>> >>>> >>>> >>>> You would have to match them at both ends, at least with my cisco’s. >>>> >>>> I have to say I have had to replace patch fibers before, especially >>>> single mode. Don’t be surprised. >>>> >>>> Have you cleaned all the connectors? The fact it works at the stepped >>>> down speed makes me suspicious. >>>> >>>> Did they give you a print out of the tdr test? >>>> >>>> dave >>>> >>>> >>>> >>>> *From:* [email protected] [mailto:[email protected] >>>> orum.com] *On Behalf Of *CSSU NetAdmin >>>> *Sent:* Friday, November 10, 2017 10:13 AM >>>> *To:* [email protected] >>>> *Subject:* Re: [NTSysADM] Interesting Fiber Problem >>>> >>>> >>>> >>>> Yes, that is correct. We had to swap out the SFP's on both ends to get >>>> it working last Friday and again yesterday. >>>> >>>> >>>> >>>> On Thu, Nov 9, 2017 at 9:16 PM, Micheal Espinola Jr < >>>> [email protected]> wrote: >>>> >>>> You are saying that the original SFPs became completely inoperable? >>>> Power-cycling or reseating the SFPs had no positive effect? You had to >>>> resort to replacing the SFPs with new/different units? You had to do this >>>> simultaneously on both ends? >>>> >>>> >>>> -- >>>> Espi >>>> >>>> >>>> >>>> >>>> >>>> On Thu, Nov 9, 2017 at 2:26 PM, CSSU NetAdmin <[email protected]> >>>> wrote: >>>> >>>> We have an interesting situation with a dark fiber connection between >>>> two of our schools. For 15 months, the connection was great- an HP switch >>>> with 10 GB SFP on one end and a Sophos 10 GB SFO on the other. Last >>>> Friday, the connection dropped. After switching out the switch, the SFP >>>> for the switch and the SFP and port on the Sophos, the connection only came >>>> up when we replace the SFP's on both ends. It was fine until today- the >>>> connection dropped. We could only bring it back by replacing the SFP's- >>>> with 1 GB units because we did not have 10 GB replacements. Last week, our >>>> fiber provider test the fiber from both ends and it was clear all the way >>>> to other end- which is about 12 miles. We talked to them today and they >>>> remain convinced that the fiber is fine. We are going to replace the patch >>>> cables next but remain skeptical that it isn't an issue with the fiber >>>> somewhere along the line. >>>> >>>> >>>> >>>> Does anyone have suggestions on where else to look? Thanks! >>>> >>>> >>>> >>>> >>>> >>> >>> >> >
