Interface is in RSTP mode while MSTP is activated on the switch

Issue Description

Customer had several questions:
1) Why are all interfaces in instance 0 while VLANs of this interface are in instance 1
2) While interface is in RSTP Mode while STP  mode is MSTP
3) Customer changed priority for instance 1, so S53-2 became Root-bridge, but RSTP switches in the ring still used S53-1 as  Root bridge. Why?

stp region-configuration
region-name Nano110
revision-level 1
instance 1 vlan 2048 to 2056
instance 2 vlan 2064 to 2072
instance 3 vlan 2080 to 2088
instance 4 vlan 2096 to 2104
 instance 5 vlan 2560 to 2568
 instance 6 vlan 2112 to 2124
instance 7 vlan 2128 to 2136
instance 8 vlan 2144 to 2152
instance 9 vlan 2160 to 2168
instance 10 vlan 3008 to 3016
active region-configuration

interface GigabitEthernet0/0/17 
description n110ch33

port link-type trunk
undo port trunk allow-pass vlan 1
port trunk allow-pass vlan 2560 to 2568 

stp instance 5 cost 19
trust 8021p
storm-control broadcast min-rate 1 max-rate 500
storm-control multicast min-rate 1 max-rate 50000
storm-control interval 180
storm-control action shutdown
storm-control enable trap
storm-control enable log 

[A3-1102-GigabitEthernet0/0/17]display stp instance 0 
——-[CIST Global Info][Mode MSTP]——-
CIST Bridge         :16384.7054-f595-4910
Config Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC      :4096 .7054-f595-4920 / 2
CIST RegRoot/IRPC   :16384.7054-f595-4910 / 0
CIST RootPortId     :128.1
BPDU-Protection     :Disabled
TC or TCN received  :5891
TC count per hello  :0
STP Converge Mode   :Normal
Share region-configuration :Enabled
Time since last TC  :0 days 0h:14m:55s
Number of TC        :2339
Last TC occurred    :Eth-Trunk1

—-[Port19(GigabitEthernet0/0/17)][FORWARDING]—-
Port Protocol       :Enabled
Port Role           :Designated Port
Port Priority       :128
Port Cost(Dot1T )   :Config=auto / Active=20000
Designated Bridge/Port   :16384.7054-f595-4910 / 128.19
Port Edged          :Config=default / Active=disabled
Point-to-point      :Config=auto / Active=true
Transit Limit       :147 packets/s
Protection Type     :None
Port STP Mode       :
RSTP  
Port Protocol Type  :Config=dot1s / Active=dot1s
BPDU Encapsulation  :Config=stp / Active=stp
PortTimes           :Hello 2s MaxAge 20s FwDly 15s RemHop 20
TC or TCN send      :6
TC or TCN received  :1
BPDU Sent           :463
TCN: 0, Config: 0, RST: 458, MST: 5
BPDU Received       :4
TCN: 0, Config: 0, RST: 4, MST: 0 

Contact information:

Telephone: 852-30623083
Email: Sales@Thunder-link.com
Supports@Thunder-link.com
Website: http://www.thunder-link.com

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