CIST Running Information

In this user interface, you can query the CIST running information.

Navigation Path

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

Parameters

Field	Value	Description
VBID	Example: 2	Displays the VB ID.
Protocol Running Mode	MSTP, STP	Displays the protocol type. MSTP: Multiple Spanning Tree Protocol STP: Spanning Tree Protocol
Bridge Priority	0 to 61440, in increments of 4096	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	00-00-00-00-00-00 to FE-FF-FF-FF-FF-FF Example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the bridge.
Root Bridge Priority	0 to 61440, in increments of 4096	Displays the priority of the root bridge.
Root Bridge MAC Address	00-00-00-00-00-00 to FE-FF-FF-FF-FF-FF Example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the root bridge.
External Path Cost ERPC	Example: 1	Displays the external path cost (ERPC). The ERPC refers to the accumulated path cost from the MST domain that the switch belongs to the CIST root switch.
Domain Root Bridge Priority	0 to 61440, in increments of 4096	Displays the priority of the domain root bridge.
Domain Root Bridge MAC Address	00-00-00-00-00-00 to FE-FF-FF-FF-FF-FF Example: 1A-2B-3C-4D-5E-6F	Displays the MAC address of the domain root bridge.
Internal Path Cost IRPC	Example: 1	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 Priority	0 to 240, in increments of 16	Displays the priority of the root port.
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)	Displays the root port.
Hello Time (s)	1-10	Displays the hello time. The hello time indicates the period for transmitting the BPDU.
Message Age	Example: 20	Displays the message age. This parameter indicates the aging of the message.
Max Age (s)	6-40	Displays the maximum age time. The maximum age time indicates the maximum aging time of the message.
Forward Delay (s)	4-30	Displays and set the forward delay. The forward delay indicates the delay of forwarding.
MST Domain Max Hop Count	1-40	Displays the maximum hop count in the MST domain. The scope of an MST domain depends on the maximum count.
Topology Change Identifier	FALSE, TRUE	Displays the identifier of the topology change.
Last Topology Change Time (s)	Example: 2	Displays the last topology change time.
Topology Change Count	Example: 2	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)	Displays the port.
Protocol Enabled Status	Enable, Disable	Displays the enabled status of the protocol.
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	0-240, in increments of 16	Displays and set 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 paths and the load is shared per VLAN.
Path Cost	1-200000000	Displays and set the trail path cost. 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.
Edge Port Attribute	Disabled, Enabled	Displays the attribute of the edge port. The edge port indicates the port that is neither directly connected to any switch nor indirectly connected to any switch through the network in connection to the port. If the port specified as the edge port transfers from the congestion status to the forwarding status, the edge port can quickly transfer without the wait of the delay. The user can specify the port connected to the terminal as the edge port.
Actual Edge Port Attribute	Disabled, Enabled	Displays the attribute of the actual edge port.
Point to Point	auto, false, true	Displays the point-to-point attribute. auto: point-to-point link attributes or non-point-to-point link attributes, as detected false: non-point-to-point link attributes true: point-to-point link attributes The point-to-point link is the direct link between two switches. If a port is connected to a point-to-point link or any other link, the connection of this port is set accordingly on all spanning tree instances. If the physical link connected to a port is not a point-to-point link, incorrect configuration of the link as a point-to-point link may introduce temporary path loop.
Actual Point To Point	false, true	Displays the actual point-to-point attributes.