I'm desperately trying to get the gigabit ports on the supervisor II+ card on in one 4506 to talk to another identical switch using these as ISLs.
They have 1000sx GBICS installed and fibre between them, each port is configured as a trunk and is enabled, full duplex, 1000 yet the port is always down (hw and sw).
I have tried crossing tx & rx just in case but still no luck.
i have the follwing in each ports config:
switchport encapsulation trunk isl
switchport mode trunk
these ports are 1000 full only so i can't set auto neg
I'm missing something simple i guess but has anyones done this, can it work?
Can someone share working port settings perhaps?