Spanning-Tree Mst Loopguard - Planet SGS-6341 Series Command Manual

Port Type
10Mbps
100Mbps
1Gbps
10Gbps
For the aggregation ports, the default costs are as below:
Port Type
10Mbps
100Mbps
1Gbps
10Gbps
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 port1/0/2, set the MSTP port cost in the instance 2 to 3000000.
Switch(Config-If-Ethernet1/0/2)#spanning-tree mst 2 cost 3000000

14.1.21 spanning-tree mst loopguard

Command:
spanning-tree [mst <instance-id>] loopguard
no spanning-tree [mst <instance-id>] loopguard
Function:
Enable the loopguard function for specified instance, the no command disables this function.
Parameter:
<instance-id>: MSTP instance ID.
Command mode:
Port Mode
Default:
Disable loopguard function.
Usage Guide:
The command can avoid root port or alternate port to be changed as designated port due to invalid
unilateralism link. When the receiving timer is time, the configured port with loopguard is set as
block state.
Default Path Cost
2000000
200000
20000
2000
Allowed Number Of Aggregation
Ports
N
N
N
N
14-111
Suggested Range
2000000~20000000
200000~2000000
20000~200000
2000~20000
Default Port Cost
2000000/N
200000/N
20000/N
2000/N