SWITCH 300-115:1.6 Configure and verify spanning tree

1.6.b Switch priority, port priority, path cost, STP timers

click to enlarge.

rp cost and designated ports

my switchlab

sw1#sh ver | i Base
Base ethernet MAC Address       : 00:16:47:9E:45:00

sw2#sh ver | i Base
Base ethernet MAC Address       : 00:16:47:9E:5F:80

sw3#sh ver | i Base
Base ethernet MAC Address       : 00:16:C7:06:96:80

sw4#sh ver | i  Base
Base ethernet MAC Address       : A8:B1:D4:D3:A9:00

the 4 hallmarks of the root switch

this bridge is the root

the rid and the bid match

port roles are all designated

port status’s are all forwarding

sh spann sw1root and designated on sw 2 and 3, and root and block on sw4, below. particularly note sw4’s cumulative cost.

sw2 spann sw3 spann sw4 spann