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Name MAC address of the bridge
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Usage Guide: Whether the switch is in the MSTP region mode or not, users can enter the
MSTP mode, configure the attributes, and save the configuration. When the switch is
running in the MSTP mode, the system will generate the MST configuration identifier
according to the MSTP configuration. Only if the switches with the same MST
configuration identifier are considered as in the same MSTP region.
Example: Enter MSTP region mode.
Switch(Config)#spanning-tree mst configuration
Switch(Config-Mstp-Region)#
6.2.2.15 spanning-tree mst cost
Command: spanning-tree mst <instance-id> cost <cost>
no spanning-tree mst <instance-id> cost
Function: Sets path cost of the current port in the specified instance; The command “no
spanning-tree mst <instance-id> cost” restores the default setting.
Parameter: <instance-id> sets the instance ID. The valid range is from 0 to 48. <cost>
sets path cost. The valid range is from 1 to 200,000,000。
Command mode: Interface Mode
Default: By default, the port cost is relevant to the port bandwidth.
Port Type Default Path Cost Suggested Range
10Mbps 2000000 2000000~20000000
100Mbps 200000 200000~2000000
1Gbps 20000 20000~200000
10Gbps 2000 2000~20000
For the aggregation ports, the default costs are as below:
Port Type Allowed Number Of
Aggregation Ports
Default Port Cost
10Mbps N 2000000/N
100Mbps N 200000/N
1Gbps N 20000/N
10Gbps N 2000/N
Usage Guide: By setting the port cost, users can control the cost from the current port to
the root bridge in order to control the elections of root port and the designated port of the
instance.
Example: On the port 1/2, set the MSTP port cost in the instance 2 to 3000000.
Switch(Config-Ethernet1/2)#spanning-tree mst 2 cost 3000000