I wouldn't be the first time in our industry when (mis)info was passed on as 'it is the way it is'....
:) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] ----- Original Message ----- > From: "Glen Waldrop" <[email protected]> > To: [email protected] > Sent: Friday, July 31, 2015 12:26:17 PM > Subject: Re: [AFMUG] Tik - Cisco SFP > I was told the same. > Seems it is in the standard. > > ----- Original Message ----- > > > From: Ken Hohhof > > > To: [email protected] > > > Sent: Friday, July 31, 2015 11:15 AM > > > Subject: Re: [AFMUG] Tik - Cisco SFP > > > I don’t know about SFP, but I was told GigE should always be set to auto. > > > “It would be bad.” > > > - Dr. Egon Spengler > > > From: Faisal Imtiaz > > > Sent: Friday, July 31, 2015 11:01 AM > > > To: [email protected] > > > Subject: Re: [AFMUG] Tik - Cisco SFP > > > Exactly......... Moral of the story... when using two boxes from two > > different mfg. do not rely on auto negotiate.... Hard Code.... is the > > preferred choice.. > > > Faisal Imtiaz > > > Snappy Internet & Telecom > > > 7266 SW 48 Street > > > Miami, FL 33155 > > > Tel: 305 663 5518 x 232 > > > Help-desk: (305)663-5518 Option 2 or Email: [email protected] > > > ----- Original Message ----- > > > > From: "Glen Waldrop" <[email protected]> > > > > > > To: [email protected] > > > > > > Sent: Friday, July 31, 2015 10:42:39 AM > > > > > > Subject: Re: [AFMUG] Tik - Cisco SFP > > > > > > We've had different results. > > > > > > I built an x86 router with MT running an Intel fiber adapter. Works like > > > a > > > charm. No issues whatsoever. > > > > > > Bossman is certain a CCR1036 is faster than a Core i7, so he replaced the > > > x86 > > > box. > > > > > > CCR would not link up to the existing fiber unless I manually set the > > > speed > > > and duplex. It did have that problem on any gigabit link, so it may have > > > primarily been an autonegotiate problem in that particular case. We did > > > have > > > problems with an SFP in a 2011 as well. > > > > > > Worked fine connecting from a CCR to a 2011. Not so well connecting to > > > anything Cisco and whatever brand converter AT&T used. Can't remember at > > > the > > > moment. Coffee isn't working yet. > > > > > > > ----- Original Message ----- > > > > > > > > > > From: Faisal Imtiaz > > > > > > > > > > To: [email protected] > > > > > > > > > > Sent: Friday, July 31, 2015 9:24 AM > > > > > > > > > > Subject: Re: [AFMUG] Tik - Cisco SFP > > > > > > > > > > Hmm... this is rather strange... > > > > > > > > > > In future keep some of these troubleshooting tips in mind.. > > > > > > > > > > 1. You have to make sure that type of SFP & (Wavelength) Matches.. > > > > > > > > > > i.e. MM --> MM SFM --> SMF , SMF can be 1310 or 1550 make sure both > > > > sides > > > > match > > > > > > > > > > 2. Make sure light is reaching both sides... > > > > > > > > > > use a light meter (if you don't have one, consider buying one .. approx > > > > $50 > > > > from Fiberstore.com) > > > > > > > > > > if you don't have a light meter, you can use use a far side loop back > > > > (simply > > > > connect the Rx side to Tx side on the far side) > > > > > > > > > > you can use this method to test each side coming up individually. > > > > > > > > > > 3. Make sure that if you are using SFP of correct ratings (i.e. 1gig in > > > > the > > > > 1gig ports) Not all SFP+ (10G) will accept 1G SFP's. > > > > > > > > > > 4. Make sure the Duplex Settings match on each side... for Cisco, it is > > > > best > > > > to hard code each side. > > > > > > > > > > 5. When using SMF SFP's, it is possible to over load the receiver, i.e. > > > > getting too much light... and not have link.... in such cases it is > > > > ideal > > > > to > > > > use a 'pad' or attenuator. This is the reason why it is important to > > > > have > > > > a > > > > light meter... > > > > > > > > > > Having said that... I have yet to come across a situation where one SFP > > > > will > > > > not connect to another SFP as long as all of the other above listed > > > > reason > > > > are not the cause of the problem.. > > > > > > > > > > If you are worried about testing compatibility.... easiest thing to do > > > > is > > > > use > > > > a fiber patch cord (LC-LC) to create yourself a loop back cable (you > > > > can > > > > add > > > > a 3db attenuator if you like), plug in the SFP in your device, make > > > > sure > > > > that the device will see the SFP, connect the loop back cable and the > > > > link > > > > should come up... > > > > > > > > > > (if you need to make field attenuator... do some googling on how to > > > > wrap > > > > fiber cable strand tightly around a #2 pencil to create one) > > > > > > > > > > :) > > > > > > > > > > Faisal Imtiaz > > > > > > > > > > Snappy Internet & Telecom > > > > > > > > > > 7266 SW 48 Street > > > > > > > > > > Miami, FL 33155 > > > > > > > > > > Tel: 305 663 5518 x 232 > > > > > > > > > > Help-desk: (305)663-5518 Option 2 or Email: [email protected] > > > > > > > > > > ----- Original Message ----- > > > > > > > > > > > From: "Jason McKemie" <[email protected]> > > > > > > > > > > > > > > > To: [email protected] > > > > > > > > > > > > > > > Sent: Thursday, July 30, 2015 11:43:43 PM > > > > > > > > > > > > > > > Subject: Re: [AFMUG] Tik - Cisco SFP > > > > > > > > > > > > > > > I tried to get a couple mikrotiks to talk to a Cisco nexus switch at > > > > > the > > > > > other end of some dark fiber. We couldn't get anything to work - > > > > > showed > > > > > as > > > > > up on my end, but down on the Cisco end. Wound up dropping a Cisco > > > > > router > > > > > in > > > > > place of the tik and it came right up. > > > > > > > > > > > > > > > On Thursday, July 30, 2015, Tyler Treat < > > > > > [email protected] > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > Does anyone have a recommended SFP for going from a 2011 to a Cisco > > > > > > Switch? > > > > > > Anything special to be aware of? > > > > > > > > > > > > > > > > > > > > > Thanks > > > > > > > > > > > > > > > > > > > > > Tyler > > > > > > > > > > > > > > >
