M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D EPort#: indicates the port number. Value ranges from 01 to max number of ports in the switchType: indicates the type of port – TP indicates Twisted PairPriority: STP uses this to determine which ports are used for forwarding. Lower the numbermeans higher priority. Value ranges from 0 to 255. Default is 128Path Cost: This is the assigned port cost value used for the switch to determine the forwardingpoints. Values range from 1 to 2000000. Lower the value, lower the cost and hence the preferredroute. The costs for different Ethernet speeds are shown below. The Path cost in STP iscompared to the path cost in RSTP.Port Type STP Path cost RSTP Path cost10 Mbps 100 2,000,000100 Mbps 19 200,0001 Gbps 4 20,00010 Gbps 2 2,000Figure 89 – Path cost as defined in IEEE 802.1d (STP) and 802.1w (RSTP)State: indicates the STP state of individual ports. Values can be Listening, Learning, Forwarding,Blocking and Disabled.Des. Bridge: this is the port’s designated root bridgeDes. Port: this is the port’s designated root portAnother screen capture of the same command, from a larger network with several switches isshown below.Magnum6K25# show rstp portsRSTP Port Configuration--------------------------------------------------------------------------------------------------------------------------Port# Type Priority Path Cost State Des. Bridge Des. Port--------------------------------------------------------------------------------------------------------------------------01 TP(10/100) 128 2000000 Disabled 00:0102 TP(10/100) 128 2000000 Disabled 00:0203 TP(10/100) 128 2000000 Disabled 00:0304 TP(10/100) 128 2000000 Disabled 00:0405 TP(10/100) 128 2000000 Disabled 00:05165
