Port Cost; Port Priority; Changing The Bridge Priority - 3Com WX1200 3CRWX120695A Configuration Manual

Port Cost

Port Priority

Changing the Bridge
Priority
Port cost is a numeric value that STP adds to the total cost of a path to
the root bridge. When a designated bridge has multiple equal-cost paths
to the root bridge, the designated bridge uses the path with the lowest
total cost. You can set this parameter on an individual port basis, for all
VLANs the port is in, or for specific VLANs.
You can specify a value from 1 through 65,535 for the port cost. The
default depends on the port speed and link type. Table 29 lists the
defaults for STP port path cost.
Table 29 SNMP Port Path Cost Defaults
Port Speed
1000 Mbps
1000 Mbps
100 Mbps
100 Mbps
100 Mbps
10 Mbps
10 Mbps
10 Mbps
Port priority is the eligibility of the port to be the designated port to the
root bridge, and thus part of the path to the root bridge. When the WX
switch has more than one link to the root bridge, STP uses the link with
the lowest priority value. You can set this parameter on an individual port
basis, for all VLANs the port is in, or for specific VLANs.
Specify a priority from 0 (highest priority) through 255 (lowest priority).
The default is 128.
To change the bridge priority, use the following command:
set spantree priority value {all | vlan vlan-id}
Specify a bridge priority from 0 through 65,535. The default is 32,768.
The all option applies the change globally to all VLANs. Alternatively,
specify an individual VLAN.
Changing Standard Spanning Tree Parameters
Link Type
Full Duplex Aggregate
Link (Port Group)
Full Duplex
Full Duplex Aggregate
Link (Port Group)
Full Duplex
Half Duplex
Full Duplex Aggregate
Link (Port Group)
Full Duplex
Half Duplex
Default Port Path Cost
19
4
19
18
19
19
95
100
353