TSHOOT : STP : Priority Change

In the above network the switch 4 is now the root. I have changed the priority to 4096 for vlan 1.


Switch#show spanning-tree
VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    4097
             Address     00D0.D312.ECD4
             This bridge is the root
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    4097  (priority 4096 sys-id-ext 1)
             Address     00D0.D312.ECD4
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  20

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1            Desg FWD 19        128.1    P2p
Fa0/2            Desg FWD 19        128.2    P2p
Fa0/3            Desg FWD 19        128.3    P2p
Fa0/4            Desg FWD 19        128.4    P2p
Fa0/5            Desg FWD 19        128.5    P2p
Fa0/6            Desg FWD 19        128.6    P2p

How to change the priority?

Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#spanning-tree ?
  mode      Spanning tree operating mode
  portfast  Spanning tree portfast options
  vlan      VLAN Switch Spanning Tree
Switch(config)#spanning-tree vlan 1 priority 4096


Now question is why the port F0/1 on switch 3 is amber???