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EES4710BD 10 Slots L2/L3/L4 Chassis Switch
10.2.2.15 spanning-tree mst cost
Command: spanning-tree mst <instance-id> cost <cost>
no spanning-tree mst <instance-id> cost
Function: Sets the route cost for the current Ethernet port; “no spanning-tree mst <instance-id>
cost” command restores the default value.
Parameters: <instance-id> is the instance ID of the specified instance, ranging from 0 – 48; <cost>
is the route cost value, ranging from 1 - 200,000,000.
Command mode: Port configuration Mode
Default: The route cost for the port corresponds to the port bandwidth by default.
Port Type Default route cost Recommended Range
10Mbps 2000000 2000000~20000000
100Mbps 200000 200000~2000000
1Gbps 20000 20000~200000
10Gbps 2000 2000~20000
For the port channel, the default port route cost is shown below:
Port Type Aggregated port number (inside
allowed aggregating number).
Default route cost
10Mbps N 2000000/N
100Mbps N 200000/N
1Gbps N 20000/N
10Gbps N 2000/N
Usage Guide: Sets the route cost for the ports that can control the rout routing cost from the
instance port to the root bridge, so as to control the election of root port and designated ports.
Example: Setting the port 1/2 route cost of the MSTP port corresponding to Instance 2 to 3000000.
Switch(Config-Ethernet1/2)#spanning-tree mst 2 cost 3000000
10.2.2.16 spanning-tree mst port-priority
Command: spanning-tree mst <instance-id> port-priority <port-priority>
no spanning-tree mst <instance-id> port-priority
Function: Sets the priority of the current port on the specified instance; the “no spanning-tree mst”
command restores the default port priority value.
Parameters: <instance-id> is the instance ID of the designated instance ranging from 0 – 48; valid
<port-priority> is the port priority value, which is multiples of 16 between 0 to 240, i.e., 0, 16, 32,
48,…, 240.
Command mode: Port configuration Mode
Default: The default port priority value is 128.
Usage Guide: Port ID of the designated instance can be configured by setting port priority, further
effecting the root port and designated port election. A smaller port priority value means higher