Extreme Networks ExtremeWare XOS 10.1, Manual

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Rapid Spanning Tree Protocol
ExtremeWare XOS 10.1 Concepts Guide 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
Designated
port
Root
port
EX_055a
A
A , 0
B
A , 1
C
A , 2
F
A , 1
E
A , 2
D
A , 3
Blocked
port
EX_055b
B
A , 1
C
A , 2
E
A , 2
D
A , 3
BPDU
Down
link
A
A , 0
F
F , 0
Designated
port
Root
port