Dear All,

I had a problem with two of our Catalyst3750.

I'm trying to configure a Port-Channel using 2 couple of GLC-BX-D & GLC-BX-U SFPs with a Single Fibre pair.

this is my network layout:

SIDE A SIDE B

GLC-BX-D port1 <----> GLC-BX-U port1

GLC-BX-D port2 <----> GLC-BX-U port2

the link didn't come up

I tried to hard loop SIDE A and SIDE B and I did not see the loop as well.

Do you think it could be due to wrong layout?

I mean, must the layout be:

SIDE A SIDE B

GLC-BX-U port1 <----> GLC-BX-D port1

GLC-BX-D port2 <----> GLC-BX-U port2

thx in advance everybody

francesco