Extreme Networks ExtremeWare XOS Guide Manual page 155

• All other ports in the network are in the forwarding state.
Figure 16: Initial network configuration
The following steps describe how the network reconverges.
1 If the link between bridge A and bridge F goes down, bridge F detects the root port is down. At this
point, bridge F:
• Immediately disables that port from the STP
• Performs a configuration update
After the configuration update, bridge F:
• Considers itself the new root bridge
• Sends a BPDU message on its designated port to bridge E
Figure 17: Down link detected
ExtremeWare XOS 10.1 Concepts Guide
A B
A , 0 A , 1
F E
A , 1 A , 2
Designated Root
port port
A B
A , 0 A , 1
Down
link
BPDU
F E
F , 0 A , 2
Designated Root
port port
C
A , 2
D
A , 3
Blocked
port
C
A , 2
D
A , 3
Rapid Spanning Tree Protocol
EX_055a
EX_055b
155