MSTI Running Information

In this interface, you can query the MSTI running information.

Navigation Path

In the NE Explorer, select the board and choose Configuration > Layer-2 Switching Management > Multiple Spanning Tree from the Function Tree. Then, click the MSTI Running Information tab.

Parameters

Field	Value	Description
VBID	For example: VB 1	Displays the VB ID.
MSTI ID	0-48	Displays the MSTI ID. Only the ID that is automatically allocated can be used.
MSTI Creating Flag	Yes, No	Displays the MSTI creating flag.
Bridge Priority	0 to 61440, 4096 as the spacing	Displays the bridge priority. The bridge priority determines whether the switch can be used as the root bridge of the spanning tree. Set a low priority to specify a switch as the root of the spanning tree. In the case of different spanning tree instances, one switch that supports the MSTP protocol may be of different priorities.
Bridge MAC Address	For example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the bridge.
Domain Root Bridge Priority	0 to 61440, 4096 as the spacing Default value: 32768	Displays the priority of the domain root bridge.
Domain Root Bridge MAC Address	For example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the domain root bridge.
Internal Path Cost IRPC	For example: 0	Displays the internal path cost (IRPC). The internal root path cost (IRPC) refers to the accumulated path costs from the port to the IST master switch.
Root Port	Equipment that supports the master and slave shelf management: shelf ID(shelf name)-slot number-board name-port number(port name) Equipment that does not support the master and slave shelf management: slot number-board name-port number(port name)	Display the root port.
Root Port Priority	0 to 240, 16 as the spacing	Displays the root port priority.
Master Bridge Priority	For example: 2	Displays the master bridge priority.
Master Bridge MAC Address	For example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the master bridge.
Path Cost to Master Bridge	For example: 0	Displays and set the path cost of the master bridge.
Topology Change Identifier	For example: 0	Displays the identifier of the topology change.
Last Topology Change Time (s)	For example: 1211	Displays the last topology change time.
Topology Change Count	For example: 0	Displays the count of the topology change.
Port	Equipment that supports the master and slave shelf management: shelf ID(shelf name)-slot number-board name-port number(port name) Equipment that does not support the master and slave shelf management: slot number-board name-port number(port name)	Display the port.
Port Role	Root, Designated, Alternate, Backup, Master, Disabled	Displays the role of the port. In the case of a non-root switch, the root port refers to the port that is nearest to the root switch. The designated port of a switch refers to the port that forwards the BPDU to the switch on an upstream switch. The alternate port refers to the backup port of the root port. If the root port is blocked, the alternate port becomes the new root port. When the two ports of a switch are connected, a ring exists. Then, the switch blocks one port that is the backup port. The master port refers to the port on the shortest trail that connects the MST domain and the root. It is the port on the switch that connects the MST domain to the root. When the parameter is set to disabled, the port role is disabled.
Port Status	Disable, Learning, Forwarding, Blocking, Discarding	Displays the port status. In the disable status: The port is disabled. In the learning status, the port only receives and transmit the BPDU packets instead of forwarding the user flow. In the forwarding status, the port forward the user flow, and receives and transmit the BPDU packets. In the discarding status, the port only receives packets of the bridge protocol data (BPDU). In the blocking status, the port is blocked.
Priority	0 to 240, 16 as the spacing Default: 128	Display the port priority. During calculation of the spanning tree, the role of a port basically depends on the port priority. In the case of different spanning tree instances, one port on the switch that supports the MSTP protocol is of different priorities. Hence, one port plays different roles in different spanning tree instances. In this way, the data of different VLANs is transported along different physical trails and the load is shared per VLAN.
Path Cost	1 to 200000000 Default: 20000	Display and set the path cost of the port. The path cost depends on the rate of the link connected to the port. In the case of the different spanning tree instances, one port on the switch that supports the MSTP protocol may have different path costs. Set proper path costs to forward the traffic of different VLANs along different physical links. In this way, the load is shared per VLAN.
Designated Port Priority	0-240, in increments of 16	Displays the priority of the designated port.
Designated Port	Equipment that supports the master and slave shelf management: shelf ID(shelf name)-slot number-board name-port number(port name) Equipment that does not support the master and slave shelf management: slot number-board name-port number(port name)	Displays the designated port.
Remaining Hop Count	Example: 5	Displays the remaining hops in the MST domain.