M4100 i M4300 - MSTP settings problem

Hi,

I have problem with configuration of MSTP for M4100 switches. One of them have set priority to 4096. No one ports of connected to the neighboring switches (all the same model and type of Netgear product) are not root ports (all are in designated states). Switches are root bridge for themself. To configure I used original documentation and looks like:

(Netgear switch) (Config)# spanning-tree
(Netgear switch) (Config)# spanning-tree forceversion 802.1s
(Netgear switch) (Config)# spanning-tree mst instance 1
Create a mst instance 1
(Netgear switch) (Config)# spanning-tree mst priority 1 4096
(Netgear switch) (Config)# spanning-tree mst vlan 1 2
(Netgear switch) (Config)# spanning-tree mst vlan 1 3
Associate the mst instance 1 with the VLAN 2 and 3

Where is the problem?

I will be greatful for help

Robert