Question : Unable to get fibre interfaces up on Cisco 3750?

Hi there,

Trying to connect a Cisco 3750 to a 2950 using twin link-aggregated fibres. Got LT - MTRJ fibres, connected the two machines, I was expecting to see some activity LEDs flash, but nothing. Both switches sit there blissfully unaware of each other and can't seem to get them talking.

I'm obviously missing something very obvious. Anyone care to tell me what it is?!

Thanks.

George

Answer : Unable to get fibre interfaces up on Cisco 3750?

>Got LT - MTRJ fibres
Make sure you have LC (LT = typo?) -> MTRJ cables
You have to make sure you have multimode fiber jumper cable, and multimode SFP module on the 3750.
What kind of jumber cables do you have? 62.5 or 50 micron? You should have 62.5 micron

Have you tried swapping the two ends of the LC on the 3750? They will swap individually, but the MTRJ ends are stationary

>I guess I'm looking at this from a simplistic viewpoint but doesn't it work like this - more links = faster throughput?
More links = more aggragate throughput, but no single connection can possibly get more than one link's worth of bandwidth.