i have two links in my switch 2960,3750 first fiber and second point to point link. Can i make etherchannel between them and which one layer two or layer three etherchannel? plz help me
As long as they're both negotiated at 1gb/full, you should be fine... The transfer speeds of the devices connected are what they are, but the etherchannel isn't dependent on that.
You should be able to mix them in either L2 or L3. Depends on what you're needing. They need to be the same speed and duplex though... You wouldn't be able to do 100Mb connection with a 1gb fiber, but if both are 1gb, you should be able to...