Intel IXM5414E - Manual (Page 273)

Intel® Blade Server Ethernet Switch Module IXM5414E 263
/ NOTE
In this example, only the default STP values are used.
The bridge with the lowest bridge ID (bridge A) was elected the root bridge, and the ports were
selected to give a high port cost between bridges B and C.
A
B C
Port 1 Port 1
Port 1 Port 1 Port 1 Port 1
Port 2 Port 2 Port 2 Port 2
Port 2 Port 2
Port 3 Port 3 Port 3 Port 3
Port 3 Port 3
LAN 1 LAN 1
LAN 2 LAN 2 LAN 3 LAN 3
Bridge ID = 15 Bridge ID = 15
Bridge ID = 30 Bridge ID = 30
Port Cost = 19 Port Cost = 19
Port Cost = 19 Port Cost = 19
Port Cost = 19 Port Cost = 19
Port Cost = 19 Port Cost = 19
Port Cost =4 Port Cost =4
Port Cost =4 Port Cost =4
Port Cost =4 Port Cost =4
Bridge ID = 20 Bridge ID = 20
A
B C
Port 1 Port 1
Port 1 Port 1 Port 1 Port 1
Port 2 Port 2 Port 2 Port 2
Port 2 Port 2
Port 3 Port 3 Port 3 Port 3
Port 3 Port 3
LAN 1 LAN 1
LAN 2 LAN 2 LAN 3 LAN 3
Blocked
Root Bridge Root Bridge
Designated Bridge Designated Bridge
Root Port Root Port Root Port Root Port
Designated Port Designated Port
Designated Port Designated Port