
Using the 7C0x SmartSwitch Bridge View
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CAUTION
All bridges in a network must use the same Spanning Tree version. Mixing Spanning Tree Algorithm protocols will cause an unstable network.
Designated Root
This value represents the bridge that is the current Root Bridge as determined by the STA. The Designated Root value consists of the configurable portion of the bridge ID (i.e., the first two octets of the
Num. Topology Chgs.
Indicates the number of times the bridge’s Topology Change flag has been changed since the bridge was powered up or initialized. The Topology Change flag increments each time any of the network’s bridges enters or leaves the network or when the Root Bridge ID changes.
The values for the following three
Forward Delay
The length of time, in seconds, that controls how long a bridge port remains in each state (Forwarding, Learning, Listening, etc.) when moving toward the Forwarding state. During a topology change, the Forward Delay is also used as the Filtering Database Ageing Time, which ensures that the Filtering Database will contain current topology information. The Root Bridge sets the Forward Delay.
Max Age
The current setting for the bridge’s BPDU ageing timer, in seconds. The ageing timer defines the maximum number of seconds that a Configuration BPDU is retained by the bridge before it is discarded. During normal operation, each bridge in the network receives a new Configuration BPDU before the ageing timer expires. If the timer expires before a new Configuration BPDU is received, it indicates that the former Root is no longer active. The remaining bridges begin Spanning Tree operation to select a new Root. The Root Bridge determines the Max Age. The range for this field is from 6 to 40 seconds, with a default value of 20 seconds.
The Spanning Tree Protocol Window |