CIST&MSTI Parameters

In this interface, you can set and query CIST&MSTI parameters.

Navigation Path

For RTN NEs, in the NE Explorer, click the NE and choose Configuration > Ethernet Protocol Configuration > MSTP Configuration from the Function Tree. Then, click the CIST&MSTI Parameters tab.

Parameters

**Table 1** Descriptions of the parameters for CIST Parameters
Field	Value	Description
Port Group	Example: port group 1	Select the port group.
MIST ID	0-16	Display the MIST ID. The number 0 indicates CIST.
Bridge Priority	0-61440, 4096 as the spacing Default: 32768	Display and set 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.
Port	Example: Slot-Board Name-Port (Port No.)	Display the port of the port group.
Priority	0-240, 16 as the spacing Default: 128	Display 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 Default GE interface: 20000 Default FE interface: 200000	Display and set the 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.