I have a large network that uses 3560 switches with trunk interface two vlans and one native vlan. We just recently converted from routed to trunk. It's a long story!
In between switches we have a Lucent Dmx product with untagged ethernet port option. We are not able to pass vlans between nodes
switchport trunk encapsulation 802.1q
switchport native vlan XXX
switchport trunk allowed vlan XXX,XXXX
vlans are subnetted properly. What seemed to help in the lab is deleting the switchport nonegotiate command. but in the network it doesn't
I see the vlans assigned in the show int trunk to the trunk and spanning tree working. Has anyone run into a problem like that with CISCO-LUCENT DMX