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 > > > > > >
