Specifications

CLI Management Guide
TigerAccess™ EE
278 SMC7824M/VSW
PVSTP is activated after selecting PVSTP mode using spanning-tree mode rapid-pvst
command. In PVSTP, you can configure the current VLAN only. If you input VLAN that
does not exist, error message is displayed.
For the switches in LAN where dual path doesn’t exist, Loop does not generate even
though STP function is not configured.
To disable a configured PVSTP, use the following command.
Command Mode Description
no spanning-tree vlan VLANS Bridge
Disables PVSTP in VLAN.
VLANS: VLAN ID (1-4094)
8.3.8.2 Root Switch
To establish PVSTP function, a root switch should be chosen first. Each switch has its
own bridge ID, and one of the switchs on same LAN is chosen as a root switch by com-
paring with their bridge IDs. A bridge ID, consisting of the switch priority and the switch
MAC address, is associated with each instance. However, you can configure the priority
and make it more likely that the switch will be chosen as the root switch. The switch hav-
ing the lowest priority becomes the root switch for that VLAN.
To configure the switch priority for a VLAN, use the following command.
Command Mode Description
spanning-tree vlan VLANS prior-
ity
<0-61440>
Configures a priority for specified VLAN.
VLANS: VLAN ID (1-4094)
0-61440: priority value in increments of 4096 (default:
32768)
no spanning-tree vlan VLANS
priority
Bridge
Deletes a configured priority for specified VLAN.
8.3.8.3 Path-cost
After deciding Root switch, you need to decide to which route you will forward the packet.
To do this, the standard is path-cost. Generally, path-cost depends on transmission speed
of LAN interface in switch. In case the route is overload based on Path-cost, it is better to
take another route.
By considering the situation, the user can configure Path-cost of Root port in order to des-
ignate the route on ones own.
To configure the path-cost value for specified vlan in PVSTP, use the following command.
Command Mode Description
spanning-tree vlan VLANS port PORTS cost
<1-200000000>
Configures path-cost to configure route
on user’s own.
VLANS: VLAN ID (1-4094)
PORTS: port number
no spanning-tree vlan VLANS port PORTS cost
Bridge
Deleted a configured path-cost.