Root Switch; Path-Cost; Port-Priority - Siemens S223 User Manual

UMN:CLI
8.3.6.2
8.3.6.3
8.3.6.4
218

Root Switch

In order establish PVSTP, PVRSTP function, first of all, Root switch should be decided.
Each switch has its own Bridge ID and Root switch on same LAN is decided by compar-
ing their Bridge ID. However, the user can change Root switch by configuring Priority for it.
The switch having the lowest priority is decided as Root switch.
To change Root switch by configuring Priority for it, use the following command.
Command
stp pvst priority VLAN-RANGE
<0-61440>
no stp pvst priority
VLAN-RANGE

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 Path-cost, use the following command.
Command
stp pvst path-cost VLAN-RANGE PORTS
<1-200000000>
no stp pvst path-cost VLAN-RANGE PORTS

Port-priority

When all conditions of two switches are same, the last standard to decide route is port-
priority. It is also possible to configure port priority so that user can configure route manu-
ally. To configure port priority, use the following command.
Command
stp pvst port-priority
VLAN-RANGE PORTS <0-240>
no stp pvst port-priority
VLAN-RANGE PORTS
SURPASS hiD 6615 S223/S323 R1.5
Mode
Configures a priority of switch.
Bridge
Clears a priority of switch.
Mode
Bridge
Mode
Configures port-priority.
Bridge
Disables port priority configuration.
User Manual
Description
Description
Configures path-cost to configure route
on user's own.
Clears path-cost configuration.
Description
A50010-Y3-C150-2-7619