My Setup:

Juniper with tagged vlans -> Cisco 3508XL ------> Cisco 3548XL ----> Customers
                                                          |   |
                                                      Customers

The 3508 XL has some locally connected customers (switchport mode access vlan ...)
Basically i need the 3508 to "forward" the vlan's to the 3548XL so i have more ports to use.
I thought this was done by configuring the port to the 3548->3508 as trunk and the same on the 3508 towards 3548, however this seems not to work.