I'm currently support some legacy SNA traffic via DLSW+ on a couple of channel attached 7204 VXR routers. Works lovely, but the devices are no longer supported (7204's) I'd like to migrate this connectivity to my 6509 core switch which has connectivity to the mainframe via ethernet (OSA card). So, I move the DLSW+ stuff to the 6509 and I should be good to go, however, I'm running into trouble setting up the bridging/source route bridging on the new 6509 core. IOS on the 6509 is:

IOS (tm) s72033_rp Software (s72033_rp-ENTSERVICESK9_WAN-M), Version 12.2(18)SX7, RELEASE SOFTWARE (fc1)

Here's my dilemma:

Enter configuration commands, one per line. End with CNTL/Z.

WPG6509-A(config)#int vlan 301

WPG6509-A(config-if)#bridge-group 1

Spanning Tree 1 is running AST.

Bridge group command will not be accepted.

What do I need to do in order to get bridge-group 1 conmand to work on an interface? I'm suspecting I need to change something with my spanning tree configuration, but I'm not sure what?

Thanks in advance.

Tom