IBM BladeCenter Installation And User Manual page 144
4-port gb ethernet switch module
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Note: In this example, only the default STP values are used.
The switch with the lowest bridge ID (switch A) was elected the root bridge, and the
ports were selected to give a high port cost between switches B and C.
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IBM BladeCenter 4-Port Gb Ethernet Switch Module: Installation and User's Guide
Port Cost = 19
Port Cost = 19
Port Cost =4
Port Cost =4
Port 1
Port 1
B
Bridge ID = 30
Bridge ID = 30
Port 3
Port 3
Port 2
Port 2
Port Cost = 19
Port Cost = 19
LAN 2
LAN 2
Designated Port
Designated Port
Root Port
Root Port
Port 1
Port 1
B
Port 3
Port 3
Port 2
Port 2
LAN 2
LAN 2
LAN 1
LAN 1
Port 3
Port 3
A
Bridge ID = 15
Bridge ID = 15
Port 1
Port 1
Port 2
Port 2
Port Cost =4
Port Cost =4
C
Bridge ID = 20
Bridge ID = 20
Port Cost = 19
Port Cost = 19
Port 2
Port 2
Port Cost = 19
Port Cost = 19
LAN 1
LAN 1
Port 3
Port 3
A
Root Bridge
Root Bridge
Port 1
Port 1
Port 2
Port 2
Designated Port
Designated Port
C
Designated Bridge
Designated Bridge
Blocked
Port 2
Port 2
Port Cost =4
Port Cost =4
Port 1
Port 1
Port 3
Port 3
LAN 3
LAN 3
Root Port
Root Port
Port 1
Port 1
Port 3
Port 3
LAN 3
LAN 3
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