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Spanning Tree Algorithm Configuration
115
NXA-ENET24 - Software Management Guide
Displaying Global Settings - Web
Click Spanning Tree, STA Information.
This command displays global STA settings, followed by settings for each port.
Configuring Global Settings
Global settings apply to the entire switch.
Command Usage
Spanning Tree Protocol
Uses RSTP for the internal state machine, but sends only 802.1D BPDUs.
Rapid Spanning Tree Protocol
RSTP supports connections to either STP or RSTP nodes by monitoring the incoming protocol
messages and dynamically adjusting the type of protocol messages the RSTP node transmits, as
described below:
Field Attributes (Cont.)
• Root Forward Delay: The maximum time (in seconds) this device will wait before changing states (i.e., dis-
carding to learning to forwarding). This delay is required because every device must
receive information about topology changes before it starts to forward frames.
In addition, each port needs time to listen for conflicting information that would make
it return to a discarding state; otherwise, temporary data loops might result.
• Transmission limit: The minimum interval between the transmission of consecutive RSTP BPDUs.
• Path Cost Method: The path cost is used to determine the best path between devices. The path cost
method is used to determine the range of values that can be assigned to each
interface.
FIG. 119
Web - Displaying Spanning Tree Information
FIG. 120 CLI - Displaying Spanning Tree Information
The current root port and current root cost display as zero when this device is not
connected to the network.