Specifications

12-12 STP Commands
set spantree portcost
Changesthecostthattransmission throughanetworkportorportsinthedefaultVLANona
RoamAboutswitchaddstothetotalcostofapathtotheSTProotbridge.
Syntax
set spantree portcost port-list cost cost
Parameters
Defaults
Thedefaultportcostdependsontheportspeedandlinktype. Table 12‐1liststhedefaultsforSTP
portpathcost.
Mode
Enabled.
Usage
Thiscommand appliesonlytothedefaultVLAN(VLAN 1).Tochangethecostofaportinanother
VLAN,usethesetspantreeportvlancostcommand.
Example
Thefollowingcommandchangesthecostonports3and 4to20:
RBT-8100# set spantree portcost 3,4 cost 20
success: change accepted.
port‐list Listofports.MSSappliesthecostchangetoallthespecifiedports.
costcost Numericvalue.Youcanspecifyavaluefrom1through65,535.STPselects
lower‐costpathsoverhigher‐costpaths.
Table 12-1 SNMP Port Path Cost Defaults
Port Speed Link Type Default Port Path Cost
1000 Mbps Full Duplex Aggregate Link (Port Group) 19
1000 Mbps Full Duplex 4
100 Mbps Full Duplex Aggregate Link (Port Group) 19
100 Mbps Full Duplex 18
100 Mbps Half Duplex 19
10 Mbps Full Duplex Aggregate Link (Port Group) 19
10 Mbps Full Duplex 95
10 Mbps Half Duplex 100