Re: LAG port goes BLK DIS state after adding to VSTP

OK there is one more possible thing.

Optics

On Juniper QFX VC I use Cisco 1 Gig transceivers. 

They are detected as:

    Xcvr 28               NON-JNPR     FNS143205E2       SFP-SX
    Xcvr 29               NON-JNPR     FNS14320K5E       SFP-SX