SMC Networks 7724M/VSW - annexe 1, Manual

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Management Guide CLI
TigerAccess™ EE
SMC7824M/VSW 273
8.3.7 Configuring MSTP
To configure MSTP, use the following steps.
Step 1
Enable STP function using the spanning-tree command.
Step 2
Select a MSTP mode using the spanning-tree mode mst command.
Step 3
Configure detail options if specific commands are required.
Step 4
Enable a MSTP daemon using the spanning-tree mst command.
8.3.7.1 Root Switch
To establish MSTP function, a root switch should be chosen first. In MSTP, a root switch
is called as IST root switch. Each switch has its own bridge ID, and one of the switchs on
same LAN is chosen as a root switch by comparing with their bridge IDs. However, you
can configure the priority and make it more likely that the switch will be chosen as the root
switch. The switch having the lowest priority becomes the root switch.
To configure the priority for an MSTP instance number, use the following command.
Command Mode Description
spanning-tree mst <0-64> prior-
ity <0-61440>
Configures the priority of the switch:
0-64: MSTP instance ID number.
0-61440: priority value in increments of 4096 (default:
32768)
no spanning-tree mst <0-64>
priority
Bridge
Clears the Priority of the switch, enter the instance
number.
If you configure a priority of STP or RSTP in the switch, you should configure MSTP in-
stance ID number as 0.
8.3.7.2 Path-cost
After deciding a root swich, you need to decide to which route you will forward the packet.
To do this, the standard is a path-cost. By the path-cost of root port, you can configure a
route manually. To configure the path-cost value for specified instance number in MSTP,
use the following command.
Command Mode Description
spanning-tree mst <0-64> port PORTS cost <1-
200000000>
Configures path-cost for specified MSTP
instance number:
0-64: MSTP instance ID number.
1-200000000: the path cost value.
no spanning-tree mst <0-64> port PORTS cost
Bridge
Deletes a configured path-cost.
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