Thanks for confirming this for me Salad. I love merging with other WISP’s - great opportunity for personal growth …and a lot of network clean-up 
fddi, fdnet, etc start 1002-1005 so I usually mark out VLAN 1001-1025 on our network so I should be ok (been working thus far…lol).
last snippet from sh vlan on 4506
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1000 enet 101000 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
last snippet from sh vlan on 3750
-------------------------------------------------------------------
1000 enet 101000 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0