Cisco catalyst to Extreme EXOS switch trunk link down

[RANT]

I have a mix of C2960S/X, C3850, Extreme 4220-48P-4x switches that I'm trying to uplink to an Extreme 4220-8X switch (8 port SFP). Both sides are using 1G MM SFPs. Here are my results:

Extreme -> Extreme = both sides UP
Cisco -> Cisco = both sides UP
Extreme -> Cisco = Extreme is UP, Cisco is DOWN
I've checked and the native vlan on both sides in VLAN 1.
I don't understand why the Cisco side port won't come up.

[MHM Cisco World]

Check STP' it can down port

Check FEC in both side 

MHM

[Jens Albrecht]

I assume that you used the same pair of SFPs and cabling for your tests in order to exclude any hardware compatibility issues.
You mentioned that the native vlan is same on both sides and I assume that the configured vlans on both sides do match as well.

In that case the problem is most likely related to STP because the defaults on both sides do not work together for sure.
So what is your STP configuration on either side?
MSTP is the only STP protocol that Cisco implemented according to RFC standards. Therefore, using MSTP is always the best option when connecting Cisco switches to any 3rd-party devices.
The Extreme switches also support Rapid-PVST+ but you have to manually create and configure the STP instances to make this work!
Finally, do not forget "switchport nonegotiate" to turn off DTP on the Cisco switch.

HTH!

[RANT]

ok, I'm very confused now.

the catalyst 2960s, 2960x, 3850 doesn't work, but I have a catalyst 3560CG-8PC with a bare config on the trunk port (don't even have no negotiate on the trunk port) and the link goes live right away on the cisco side (using same SFP and fibers used to connect to 3850/2960).

The Extreme is using mst and the cisco 3560CG is set for pvst:
spanning-tree mode pvst
spanning-tree extend system-id
!
interface GigabitEthernet0/10
switchport trunk encapsulation dot1q
switchport mode trunk

The vlan list doesn't match either, but the link is up. I don't understand.

[RANT · Accepted solution]

Riddle solved.

Tried the no negotiate port, but no go.

Went to the Cisco port and did "speed nonegotiate" and that worked. Port comes up and passes traffic.