MSTP Configuration
This chapter contains a complete sample Multiple Spanning Tree Protocol (MSTP) configuration. MSTP allows multiple VLANs to be grouped into one spanning-tree instance. Every MST instance has a spanning-tree that is independent of other spanning-tree instances providing multiple forwarding paths for data traffic.
Topology
This example gives a simple multi-bridge topology and its configuration.
MSTP Topology
Note: Run the switchport command on each port to change to Layer-2 mode.
Configuration
Bridge 1
Bridge1#configure terminal | Enter configure mode. |
Bridge1(config)#bridge 1 protocol mstp | Add a bridge (1) to the multiple spanning tree table. |
Bridge1(config)#vlan database | Enter the VLAN configuration mode. |
Bridge1(config-vlan)#vlan 2 bridge 1 state enable | Enable the state of VLAN 2 on bridge 1. Specifying an enable state allows forwarding of frames over VLAN 2 on bridge 1. |
Bridge1(config-vlan)#vlan 3 bridge 1 state enable | Enable the state of VLAN 3 on bridge 1. Specifying an enable state allows forwarding of frames over VLAN 3 on bridge 1. |
Bridge1(config-vlan)#vlan 4 bridge 1 state enable | Enable the state of VLAN 4 on bridge 1. Specifying an enable state allows forwarding of frames over VLAN 4 on bridge 1. |
Bridge1(config-vlan)#vlan 5 bridge 1 state enable | Enable the state of VLAN 5 on bridge 1. Specifying an enable state allows forwarding of frames over VLAN 5 on bridge 1. |
Bridge1(config-vlan)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-vlan)#exit | Exit the VLAN configuration mode. |
Bridge1(config)#spanning-tree mst configuration | Enter the Multiple Spanning Tree |
Bridge1(config-mst)#bridge 1 instance 2 vlan 2 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge1(config-mst)#bridge 1 instance 3 vlan 3 | Create another instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge1(config-mst)#bridge 1 instance 4 vlan 4 | Create another instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge1(config-mst)#bridge 1 instance 5 vlan 5 | Create another instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge1(config-mst)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-mst)#exit | Exit MST Configuration mode. |
Bridge1(config)#interface eth2 | Enter interface mode for eth2 |
Bridge1(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge1(config-if)#bridge-group 1 | Associating the interface to bridge-group 1 |
Bridge1(config-if)#bridge-group 1 instance 2 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 3 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 4 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 5 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-if)#exit | Exit interface mode. |
Bridge1(config)#interface eth3 | Enter interface mode for eth3. |
Bridge1(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge1(config-if)#bridge-group 1 | Associating the interface to bridge-group 1 |
Bridge1(config-if)#bridge-group 1 instance 2 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 3 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 4 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 5 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-if)#exit | Exit interface mode. |
Bridge1(config)#interface eth4 | Enter interface mode for eth4. |
Bridge1(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge1(config-if)#bridge-group 1 | Associating the interface to bridge-group 1 |
Bridge1(config-if)#bridge-group 1 instance 2 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 3 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 4 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 5 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-if)#exit | Exit interface mode. |
Bridge1(config)#interface eth5 | Enter interface mode for eth5. |
Bridge1(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge1(config-if)#bridge-group 1 | Associating the interface to bridge-group 1 |
Bridge1(config-if)#bridge-group 1 instance 2 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 3 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 4 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#bridge-group 1 instance 5 | Assigning bridge-group 1 to this instance |
Bridge1(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge1(config-if)#exit | Exit interface mode. |
Bridge 2
Bridge2#configure terminal | Enter configure mode. |
Bridge2(config)#bridge 2 protocol mstp | Add a bridge (2) to the multiple spanning |
Bridge2(config)#bridge 2 priority 4096 | Assign priority to this bridge. |
Bridge2(config)#vlan database | Enter the VLAN configuration mode. |
Bridge2(config-vlan)#vlan 2 bridge 2 state enable | Enable the state of VLAN 2 on bridge 2. Specifying an enable state allows forwarding of frames over VLAN 2 on bridge 2. |
Bridge2(config-vlan)#vlan 3 bridge 2 state enable | Enable the state of VLAN 3 on bridge 2. Specifying an enable state allows forwarding of frames over VLAN 3 on bridge 2 |
Bridge2(config-vlan)#vlan 4 bridge 2 state enable | Enable the state of VLAN 4 on bridge 2. Specifying an enable state allows forwarding of frames over VLAN 4 on bridge 2 |
Bridge2(config-vlan)#vlan 5 bridge 2 state enable | Enable the state of VLAN 5 on bridge 2. Specifying an enable state allows forwarding of frames over VLAN 5 on bridge 2 |
Bridge2(config-vlan)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-vlan)#exit | Exit the VLAN configuration mode. |
Bridge2(config)#spanning-tree mst configuration | Enter the Multiple Spanning Tree configuration mode |
Bridge2(config-mst)#bridge 2 instance 2 vlan 2 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge2(config-mst)#bridge 2 instance 3 vlan 3 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge2(config-mst)#bridge 2 instance 4 vlan 4 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge2(config-mst)#bridge 2 instance 5 vlan 5 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge2(config-mst)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-mst)#exit | Exit MST Configuration mode. |
Bridge2(config)#interface eth2 | Enter interface mode for eth2 |
Bridge2(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge2(config-if)#bridge-group 2 | Associating the interface to bridge-group 2 |
Bridge2(config-if)#bridge-group 2 instance 2 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 3 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 4 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 5 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-if)#exit | Exit interface mode. |
Bridge2(config)#interface eth3 | Enter interface mode for eth3 |
Bridge2(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge2(config-if)#bridge-group 2 | Associating the interface to bridge-group 2 |
Bridge2(config-if)#bridge-group 2 instance 2 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 3 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 3 priority 16 | Assign bridge-group 2 to this instance and set a port priority in order of 16 for it. MSTP uses port priority as a tiebreaker to determine which port should forward frames for a particular instance on a LAN, or which port should be the root port for an instance. A lower value implies better priority. |
Bridge2(config-if)#bridge-group 2 instance 4 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 4 priority 16 | Assign bridge-group 2 to this instance and set a port priority in order of 16 for it. MSTP uses port priority as a tiebreaker to determine which port should forward frames for a particular instance on a LAN, or which port should be the root port for an instance. A lower value implies better priority |
Bridge2(config-if)#bridge-group 2 instance 5 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-if)#exit | Exit interface mode |
Bridge2(config)#interface eth4 | Enter interface mode for eth4 |
Bridge2(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge2(config-if)#bridge-group 2 | Associating the interface to bridge-group 2 |
Bridge2(config-if)#bridge-group 2 instance 2 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 3 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 4 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 5 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-if)#exit | Exit interface mode. |
Bridge2(config)#interface eth5 | Enter interface mode for eth5 |
Bridge2(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge2(config-if)#bridge-group 2 | Associating the interface to bridge-group 2 |
Bridge2(config-if)#bridge-group 2 instance 2 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 3 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 4 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#bridge-group 2 instance 5 | Assigning bridge-group 2 to this instance |
Bridge2(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge2(config-if)#exit | Exit interface mode. |
Bridge 3
Bridge3#configure terminal | Enter configure mode. |
Bridge3(config)#bridge 3 protocol mstp | Add a bridge (3) to the multiple spanning tree table |
Bridge3(config)#vlan database | Enter the VLAN configuration mode. |
Bridge3(config-vlan)#vlan 2 bridge 3 state enable | Enable the state of VLAN 2 on bridge 3. Specifying an enable state allows forwarding of frames over VLAN 2 on bridge 3. |
Bridge3(config-vlan)#vlan 3 bridge 3 state enable | Enable the state of VLAN 3 on bridge 3. Specifying an enable state allows forwarding of frames over VLAN 3 on bridge 3. |
Bridge3(config-vlan)#vlan 4 bridge 3 state enable | Enable the state of VLAN 4 on bridge 3. Specifying an enable state allows forwarding of frames over VLAN 4 on bridge 3. |
Bridge3(config-vlan)#vlan 5 bridge 3 state enable | Enable the state of VLAN 5 on bridge 3. Specifying an enable state allows forwarding of frames over VLAN 5 on bridge 3. |
Bridge3(config-vlan)#commit | Commit the candidate configuration to the running configuration. |
Bridge3(config-vlan)#exit | Exit the VLAN configuration mode. |
Bridge3(config)#spanning-tree mst configuration | Enter the Multiple Spanning Tree Configuration mode. |
Bridge3(config-mst)#bridge 3 instance 2 vlan 2 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge3(config-mst)#bridge 3 instance 3 vlan 3 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge3(config-mst)#bridge 3 instance 4 vlan 4 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge3(config-mst)#bridge 3 instance 5 vlan 5 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge3(config-mst)#commit | Commit the candidate configuration to the running configuration. |
Bridge3(config-mst)#exit | Exit MST Configuration mode. |
Bridge3(config)#interface eth2 | Enter interface mode for eth2 |
Bridge3(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge3(config-if)#bridge-group 3 | Associating the interface to bridge-group 3 |
Bridge3(config-if)#bridge-group 3 instance 2 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 3 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 4 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 5 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge3(config-if)#exit | Exit interface mode. |
Bridge3(config)#interface eth3 | Enter interface mode for eth3 |
Bridge3(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge3(config-if)#bridge-group 3 | Associating the interface to bridge-group 3 |
Bridge3(config-if)#bridge-group 3 instance 2 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 3 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 4 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#bridge-group 3 instance 5 | Assigning bridge-group 3 to this instance |
Bridge3(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge3(config-if)#exit | Exit interface mode. |
Bridge 4
Bridge4#configure terminal | Enter configure mode. |
Bridge4(config)#bridge 4 protocol mstp | Add a bridge (4) to the multiple spanning tree table |
Bridge4(config)#vlan database | Enter the VLAN configuration mode. |
Bridge4(config-vlan)#vlan 2 bridge 4 state enable | Enable the state of VLAN 2 on bridge 4. Specifying an enable state allows forwarding of frames over VLAN 2 on bridge 4. |
Bridge4(config-vlan)#vlan 3 bridge 4 state enable | Enable the state of VLAN 3 on bridge 4. Specifying an enable state allows forwarding of frames over VLAN 3 on bridge 4. |
Bridge4(config-vlan)#vlan 4 bridge 4 state enable | Enable the state of VLAN 4 on bridge 4. Specifying an enable state allows forwarding of frames over VLAN 4 on bridge 4. |
Bridge4(config-vlan)#vlan 5 bridge 4 state enable | Enable the state of VLAN 5 on bridge 4. Specifying an enable state allows forwarding of frames over VLAN 5 on bridge 4. |
Bridge4(config-vlan)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-vlan)#exit | Exit the VLAN configuration mode. |
Bridge4(config)#spanning-tree mst configuration | Enter the Multiple Spanning Tree Configuration mode. |
Bridge4(config-mst)#bridge 4 instance 2 vlan 2 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge4(config-mst)#bridge 4 instance 3 vlan 3 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge4(config-mst)#bridge 4 instance 4 vlan 4 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge4(config-mst)#bridge 4 instance 5 vlan 5 | Create an instance of VLAN. The VLANs must be created before being associating with an MST instance (MSTI). If the VLAN range is not specified the MSTI will not be created. |
Bridge4(config-mst)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-mst)#exit | Exit MST Configuration mode. |
Bridge4(config)#interface eth2 | Enter interface mode for eth2 |
Bridge4(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge4(config-if)#bridge-group 4 | Associating the interface to bridge-group 4 |
Bridge4(config-if)#bridge-group 4 instance 2 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 3 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 4 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 5 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-if)#exit | Exit interface mode. |
Bridge4(config)#interface eth3 | Enter interface mode for eth3 |
Bridge4(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge4(config-if)#bridge-group 4 | Associating the interface to bridge-group 4 |
Bridge4(config-if)#bridge-group 4 instance 2 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 3 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 4 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 5 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-if)#exit | Exit interface mode. |
Bridge4(config)#interface eth4 | Enter interface mode for eth4 |
Bridge4(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge4(config-if)#bridge-group 4 | Associating the interface to bridge-group 4 |
Bridge4(config-if)#bridge-group 4 instance 2 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 3 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 4 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 5 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-if)#exit | Exit interface mode. |
Bridge4(config)#interface eth5 | Enter interface mode for eth5 |
Bridge4(config-if)#switchport | Configure interface as a layer 2 port. |
Bridge4(config-if)#bridge-group 4 | Associating the interface to bridge-group 4 |
Bridge4(config-if)#bridge-group 4 instance 2 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 3 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 4 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#bridge-group 4 instance 5 | Assigning bridge-group 4 to this instance |
Bridge4(config-if)#commit | Commit the candidate configuration to the running configuration. |
Bridge4(config-if)#exit | Exit interface mode. |
Validation
show spanning-tree, show spanning-tree mst detail
# show spanning-tree mst detail
% 1: Bridge up - Spanning Tree Enabled - topology change detected
% 1: CIST Root Path Cost 0 - CIST Root Port 4 - CIST Bridge Priority 32768
% 1: Forward Delay 15 - Hello Time 2 - Max Age 20 - Transmit Hold Count 6 - Max-hops 20
% 1: CIST Root Id 1000525400751db5
% 1: CIST Reg Root Id 1000525400751db5
% 1: CIST Bridge Id 80005254009cb7e6
% 1: 32 topology change(s) - last topology change Mon Aug 17 10:45:25 2020
% 1: portfast bpdu-filter disabled
% 1: portfast bpdu-guard disabled
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Rootport - State Forwarding
% eth2: Designated External Path Cost 0 -Internal Path Cost 200000
% eth2: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth2: Designated Port Id 0x8004 - CIST Priority 128 -
% eth2: CIST Root 1000525400751db5
% eth2: Regional Root 1000525400751db5
% eth2: Designated Bridge 1000525400751db5
% eth2: Message Age 0 - Max Age 20
% eth2: CIST Hello Time 2 - Forward Delay 15
% eth2: CIST Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0 - topo change timer 0
% eth2: forward-transitions 1
% eth2: Restricted-role OFF
% eth2: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth2: No portfast configured - Current portfast off
% eth2: bpdu-guard default - Current bpdu-guard off
% eth2: bpdu-filter default - Current bpdu-filter off
% eth2: no root guard configured - Current root guard off
% eth2: Configured Link Type point-to-point - Current point-to-point
% eth2: No auto-edge configured - Current port Auto Edge off
%
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated External Path Cost 0 -Internal Path Cost 200000
% eth3: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth3: Designated Port Id 0x8005 - CIST Priority 128 -
% eth3: CIST Root 1000525400751db5
% eth3: Regional Root 1000525400751db5
% eth3: Designated Bridge 1000525400751db5
% eth3: Message Age 0 - Max Age 20
% eth3: CIST Hello Time 2 - Forward Delay 15
% eth3: CIST Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0 - topo change timer 0
% eth3: forward-transitions 2
% eth3: Restricted-role OFF
% eth3: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth3: No portfast configured - Current portfast off
% eth3: bpdu-guard default - Current bpdu-guard off
% eth3: bpdu-filter default - Current bpdu-filter off
% eth3: no root guard configured - Current root guard off
% eth3: Configured Link Type point-to-point - Current point-to-point
% eth3: No auto-edge configured - Current port Auto Edge off
%
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Alternate - State Discarding
% eth4: Designated External Path Cost 0 -Internal Path Cost 200000
% eth4: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth4: Designated Port Id 0x8006 - CIST Priority 128 -
% eth4: CIST Root 1000525400751db5
% eth4: Regional Root 1000525400751db5
% eth4: Designated Bridge 800052540046f549
% eth4: Message Age 0 - Max Age 20
% eth4: CIST Hello Time 2 - Forward Delay 15
% eth4: CIST Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1 - topo change timer 0
% eth4: forward-transitions 3
% eth4: Restricted-role OFF
% eth4: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth4: No portfast configured - Current portfast off
% eth4: bpdu-guard default - Current bpdu-guard off
% eth4: bpdu-filter default - Current bpdu-filter off
% eth4: no root guard configured - Current root guard off
% eth4: Configured Link Type point-to-point - Current point-to-point
% eth4: No auto-edge configured - Current port Auto Edge off
%
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Designated - State Forwarding
% eth5: Designated External Path Cost 0 -Internal Path Cost 200000
% eth5: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth5: Designated Port Id 0x8007 - CIST Priority 128 -
% eth5: CIST Root 1000525400751db5
% eth5: Regional Root 1000525400751db5
% eth5: Designated Bridge 80005254009cb7e6
% eth5: Message Age 0 - Max Age 20
% eth5: CIST Hello Time 2 - Forward Delay 15
% eth5: CIST Forward Timer 0 - Msg Age Timer 0 - Hello Timer 1 - topo change timer 0
% eth5: forward-transitions 4
% eth5: Restricted-role OFF
% eth5: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth5: No portfast configured - Current portfast off
% eth5: bpdu-guard default - Current bpdu-guard off
% eth5: bpdu-filter default - Current bpdu-filter off
% eth5: no root guard configured - Current root guard off
% eth5: Configured Link Type point-to-point - Current point-to-point
% eth5: No auto-edge configured - Current port Auto Edge off
%
% Instance 2: Vlans: 2
% 1: MSTI Root Path Cost 200000 -MSTI Root Port 6 - MSTI Bridge Priority 32768
% 1: MSTI Root Id 800252540046f549
% 1: MSTI Bridge Id 80025254009cb7e6
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Alternate - State Discarding
% eth2: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth2: Configured Internal Path Cost 200000
% eth2: Configured CST External Path cost 200000
% eth2: CST Priority 128 - MSTI Priority 128
% eth2: Designated Root 800252540046f549
% eth2: Designated Bridge 80025254009cb7e6
% eth2: Message Age 0
% eth2: Hello Time 2 - Forward Delay 15
% eth2: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated Internal Path Cost 200000 - Designated Port Id 0x8005
% eth3: Configured Internal Path Cost 200000
% eth3: Configured CST External Path cost 200000
% eth3: CST Priority 128 - MSTI Priority 128
% eth3: Designated Root 800252540046f549
% eth3: Designated Bridge 80025254009cb7e6
% eth3: Message Age 0
% eth3: Hello Time 2 - Forward Delay 15
% eth3: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Rootport - State Forwarding
% eth4: Designated Internal Path Cost 0 - Designated Port Id 0x8006
% eth4: Configured Internal Path Cost 200000
% eth4: Configured CST External Path cost 200000
% eth4: CST Priority 128 - MSTI Priority 128
% eth4: Designated Root 800252540046f549
% eth4: Designated Bridge 80025254009cb7e6
% eth4: Message Age 0
% eth4: Hello Time 2 - Forward Delay 15
% eth4: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Alternate - State Discarding
% eth5: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth5: Configured Internal Path Cost 200000
% eth5: Configured CST External Path cost 200000
% eth5: CST Priority 128 - MSTI Priority 128
% eth5: Designated Root 800252540046f549
% eth5: Designated Bridge 80025254009cb7e6
% eth5: Message Age 0
% eth5: Hello Time 2 - Forward Delay 15
% eth5: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% Instance 3: Vlans: 3
% 1: MSTI Root Path Cost 200000 -MSTI Root Port 6 - MSTI Bridge Priority 32768
% 1: MSTI Root Id 800352540046f549
% 1: MSTI Bridge Id 80035254009cb7e6
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Alternate - State Discarding
% eth2: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth2: Configured Internal Path Cost 200000
% eth2: Configured CST External Path cost 200000
% eth2: CST Priority 128 - MSTI Priority 128
% eth2: Designated Root 800352540046f549
% eth2: Designated Bridge 80035254009cb7e6
% eth2: Message Age 0
% eth2: Hello Time 2 - Forward Delay 15
% eth2: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated Internal Path Cost 200000 - Designated Port Id 0x1005
% eth3: Configured Internal Path Cost 200000
% eth3: Configured CST External Path cost 200000
% eth3: CST Priority 128 - MSTI Priority 128
% eth3: Designated Root 800352540046f549
% eth3: Designated Bridge 80035254009cb7e6
% eth3: Message Age 0
% eth3: Hello Time 2 - Forward Delay 15
% eth3: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Rootport - State Forwarding
% eth4: Designated Internal Path Cost 0 - Designated Port Id 0x8006
% eth4: Configured Internal Path Cost 200000
% eth4: Configured CST External Path cost 200000
% eth4: CST Priority 128 - MSTI Priority 128
% eth4: Designated Root 800352540046f549
% eth4: Designated Bridge 80035254009cb7e6
% eth4: Message Age 0
% eth4: Hello Time 2 - Forward Delay 15
% eth4: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Alternate - State Discarding
% eth5: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth5: Configured Internal Path Cost 200000
% eth5: Configured CST External Path cost 200000
% eth5: CST Priority 128 - MSTI Priority 128
% eth5: Designated Root 800352540046f549
% eth5: Designated Bridge 80035254009cb7e6
% eth5: Message Age 0
% eth5: Hello Time 2 - Forward Delay 15
% eth5: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% Instance 4: Vlans: 4
% 1: MSTI Root Path Cost 200000 -MSTI Root Port 6 - MSTI Bridge Priority 32768
% 1: MSTI Root Id 800452540046f549
% 1: MSTI Bridge Id 80045254009cb7e6
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Alternate - State Discarding
% eth2: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth2: Configured Internal Path Cost 200000
% eth2: Configured CST External Path cost 200000
% eth2: CST Priority 128 - MSTI Priority 128
% eth2: Designated Root 800452540046f549
% eth2: Designated Bridge 80045254009cb7e6
% eth2: Message Age 0
% eth2: Hello Time 2 - Forward Delay 15
% eth2: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated Internal Path Cost 200000 - Designated Port Id 0x1005
% eth3: Configured Internal Path Cost 200000
% eth3: Configured CST External Path cost 200000
% eth3: CST Priority 128 - MSTI Priority 128
% eth3: Designated Root 800452540046f549
% eth3: Designated Bridge 80045254009cb7e6
% eth3: Message Age 0
% eth3: Hello Time 2 - Forward Delay 15
% eth3: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Rootport - State Forwarding
% eth4: Designated Internal Path Cost 0 - Designated Port Id 0x8006
% eth4: Configured Internal Path Cost 200000
% eth4: Configured CST External Path cost 200000
% eth4: CST Priority 128 - MSTI Priority 128
% eth4: Designated Root 800452540046f549
% eth4: Designated Bridge 80045254009cb7e6
% eth4: Message Age 0
% eth4: Hello Time 2 - Forward Delay 15
% eth4: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Alternate - State Discarding
% eth5: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth5: Configured Internal Path Cost 200000
% eth5: Configured CST External Path cost 200000
% eth5: CST Priority 128 - MSTI Priority 128
% eth5: Designated Root 800452540046f549
% eth5: Designated Bridge 80045254009cb7e6
% eth5: Message Age 0
% eth5: Hello Time 2 - Forward Delay 15
% eth5: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% Instance 5: Vlans: 5
% 1: MSTI Root Path Cost 200000 -MSTI Root Port 6 - MSTI Bridge Priority 32768
% 1: MSTI Root Id 800552540046f549
% 1: MSTI Bridge Id 80055254009cb7e6
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Alternate - State Discarding
% eth2: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth2: Configured Internal Path Cost 200000
% eth2: Configured CST External Path cost 200000
% eth2: CST Priority 128 - MSTI Priority 128
% eth2: Designated Root 800552540046f549
% eth2: Designated Bridge 80055254009cb7e6
% eth2: Message Age 0
% eth2: Hello Time 2 - Forward Delay 15
% eth2: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated Internal Path Cost 200000 - Designated Port Id 0x8005
% eth3: Configured Internal Path Cost 200000
% eth3: Configured CST External Path cost 200000
% eth3: CST Priority 128 - MSTI Priority 128
% eth3: Designated Root 800552540046f549
% eth3: Designated Bridge 80055254009cb7e6
% eth3: Message Age 0
% eth3: Hello Time 2 - Forward Delay 15
% eth3: Forward Timer 0 - Msg Age Timer 5 - Hello Timer 0
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Rootport - State Forwarding
% eth4: Designated Internal Path Cost 0 - Designated Port Id 0x8006
% eth4: Configured Internal Path Cost 200000
% eth4: Configured CST External Path cost 200000
% eth4: CST Priority 128 - MSTI Priority 128
% eth4: Designated Root 800552540046f549
% eth4: Designated Bridge 80055254009cb7e6
% eth4: Message Age 0
% eth4: Hello Time 2 - Forward Delay 15
% eth4: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Alternate - State Discarding
% eth5: Designated Internal Path Cost 200000 - Designated Port Id 0x8004
% eth5: Configured Internal Path Cost 200000
% eth5: Configured CST External Path cost 200000
% eth5: CST Priority 128 - MSTI Priority 128
% eth5: Designated Root 800552540046f549
% eth5: Designated Bridge 80055254009cb7e6
% eth5: Message Age 0
% eth5: Hello Time 2 - Forward Delay 15
% eth5: Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1
#show spanning-tree
% 1: Bridge up - Spanning Tree Enabled - topology change detected
% 1: CIST Root Path Cost 0 - CIST Root Port 4 - CIST Bridge Priority 32768
% 1: Forward Delay 15 - Hello Time 2 - Max Age 20 - Transmit Hold Count 6 - Max-hops 20
% 1: CIST Root Id 1000525400751db5
% 1: CIST Reg Root Id 1000525400751db5
% 1: CIST Bridge Id 80005254009cb7e6
% 1: 32 topology change(s) - last topology change Mon Aug 17 10:45:25 2020
% 1: portfast bpdu-filter disabled
% 1: portfast bpdu-guard disabled
% eth2: Port Number 4 - Ifindex 4 - Port Id 0x8004 - Role Rootport - State Forwarding
% eth2: Designated External Path Cost 0 -Internal Path Cost 200000
% eth2: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth2: Designated Port Id 0x8004 - CIST Priority 128 -
% eth2: CIST Root 1000525400751db5
% eth2: Regional Root 1000525400751db5
% eth2: Designated Bridge 1000525400751db5
% eth2: Message Age 0 - Max Age 20
% eth2: CIST Hello Time 2 - Forward Delay 15
% eth2: CIST Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1 - topo change timer 0
% eth2: forward-transitions 1
% eth2: Restricted-role OFF
% eth2: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth2: No portfast configured - Current portfast off
% eth2: bpdu-guard default - Current bpdu-guard off
% eth2: bpdu-filter default - Current bpdu-filter off
% eth2: no root guard configured - Current root guard off
% eth2: Configured Link Type point-to-point - Current point-to-point
% eth2: No auto-edge configured - Current port Auto Edge off
%
% eth3: Port Number 5 - Ifindex 5 - Port Id 0x8005 - Role Alternate - State Discarding
% eth3: Designated External Path Cost 0 -Internal Path Cost 200000
% eth3: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth3: Designated Port Id 0x8005 - CIST Priority 128 -
% eth3: CIST Root 1000525400751db5
% eth3: Regional Root 1000525400751db5
% eth3: Designated Bridge 1000525400751db5
% eth3: Message Age 0 - Max Age 20
% eth3: CIST Hello Time 2 - Forward Delay 15
% eth3: CIST Forward Timer 0 - Msg Age Timer 4 - Hello Timer 1 - topo change timer 0
% eth3: forward-transitions 2
% eth3: Restricted-role OFF
% eth3: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth3: No portfast configured - Current portfast off
% eth3: bpdu-guard default - Current bpdu-guard off
% eth3: bpdu-filter default - Current bpdu-filter off
% eth3: no root guard configured - Current root guard off
% eth3: Configured Link Type point-to-point - Current point-to-point
% eth3: No auto-edge configured - Current port Auto Edge off
%
% eth4: Port Number 6 - Ifindex 6 - Port Id 0x8006 - Role Alternate - State Discarding
% eth4: Designated External Path Cost 0 -Internal Path Cost 200000
% eth4: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth4: Designated Port Id 0x8006 - CIST Priority 128 -
% eth4: CIST Root 1000525400751db5
% eth4: Regional Root 1000525400751db5
% eth4: Designated Bridge 800052540046f549
% eth4: Message Age 0 - Max Age 20
% eth4: CIST Hello Time 2 - Forward Delay 15
% eth4: CIST Forward Timer 0 - Msg Age Timer 3 - Hello Timer 0 - topo change timer 0
% eth4: forward-transitions 3
% eth4: Restricted-role OFF
% eth4: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth4: No portfast configured - Current portfast off
% eth4: bpdu-guard default - Current bpdu-guard off
% eth4: bpdu-filter default - Current bpdu-filter off
% eth4: no root guard configured - Current root guard off
% eth4: Configured Link Type point-to-point - Current point-to-point
% eth4: No auto-edge configured - Current port Auto Edge off
%
% eth5: Port Number 7 - Ifindex 7 - Port Id 0x8007 - Role Designated - State Forwarding
% eth5: Designated External Path Cost 0 -Internal Path Cost 200000
% eth5: Configured Path Cost 200000 - Add type Explicit ref count 5
% eth5: Designated Port Id 0x8007 - CIST Priority 128 -
% eth5: CIST Root 1000525400751db5
% eth5: Regional Root 1000525400751db5
% eth5: Designated Bridge 80005254009cb7e6
% eth5: Message Age 0 - Max Age 20
% eth5: CIST Hello Time 2 - Forward Delay 15
% eth5: CIST Forward Timer 0 - Msg Age Timer 0 - Hello Timer 0 - topo change timer 0
% eth5: forward-transitions 4
% eth5: Restricted-role OFF
% eth5: Version Multiple Spanning Tree Protocol - Receive MSTP - Send MSTP
% eth5: No portfast configured - Current portfast off
% eth5: bpdu-guard default - Current bpdu-guard off
% eth5: bpdu-filter default - Current bpdu-filter off
% eth5: no root guard configured - Current root guard off
% eth5: Configured Link Type point-to-point - Current point-to-point
% eth5: No auto-edge configured - Current port Auto Edge off