My question pertains to Spanning Tree on an access switch.
This is how it looks like on my switch which is switch_A.
Switch_A#sh spanning-tree int gi1/1
Vlan Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0112 Desg FWD 3004 128.1 P2p
VLAN0140 Root FWD 3004 128.1 P2p
VLAN0161 Root FWD 3004 128.1 P2p
VLAN0162 Root FWD 3004 128.1 P2p
VLAN0163 Root FWD 3004 128.1 P2p
VLAN0164 Root FWD 3004 128.1 P2p
My question is that vlan0112 does not work on this switch. If my understanding on SPT is correct, it needs to have a Root port for vlan 112 which it is not having.  My question is how do
I put int gi1/1 as root for vlan 112 ?
 Also what is the numbering 128.1 for ? Other switches have this same numbering 128.2 and
128.3 and so on ... What does this signify ? Also the cost here is the cost path to the root bridge right ?
 P2P means point-to-point which is a full/duplex connection and P2P Edge is a point-to-point to an end station and Shr is a half duplex connectoion right ? This is just to let us know what type of connection is this interface isn't it ?
 I have setup a trunk and notice that the trunk works even though the vlans on both end of the trunks are not the same !!! I thaught trunks won't form if the vlans are not the same in it .. I guess that I have learnt something new here.
 How can I add vlan 112 to an existing trunk on a 6500 running CatOS ? There is no downtime when I add the connection right ? Below is the existing configuration.
clear trunk 5/12 1-45,47-119,122-126,128-139,141-160,169-649,655-699,702-709,711-4094
set trunk 5/12 on dot1q 46,120-121,127,140,161-168,650-654,700-701,710
Sorry for the many parts to it, but it is all related to my first question.
Thanks a million,