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Chapter 45 Spanning Tree Protocol
XMG1915 Series User’s Guide
248
Figure 172 SWITCHING > Spanning Tree Protocol > Spanning Tree Protocol Status: RSTP
The following table describes the labels in this screen.
Table 133 SWITCHING > Spanning Tree Protocol > Spanning Tree Protocol Status: RSTP
LABEL DESCRIPTION
Spanning Tree Protocol: RSTP
Bridge Root Bridge refers to the base of the spanning tree (the root bridge). Our Bridge is this Switch.
This Switch may also be the root bridge.
Bridge ID This is the unique identifier for this bridge, consisting of bridge priority plus MAC address. This ID
is the same for Root Bridge and Our Bridge if the Switch is the root switch.
Hello Time
(seconds)
This is the time interval (in seconds) at which the root switch transmits a configuration
message. The root bridge determines Hello Time, Max Age and Forwarding Delay.
Max Age
(seconds)
This is the maximum time (in seconds) the Switch can wait without receiving a configuration
message before attempting to reconfigure.
Forwarding Delay
(seconds)
This is the time (in seconds) the root switch will wait before changing states (that is, listening to
learning to forwarding).
Note: The listening state does NOT exist in RSTP.
Cost to Bridge This is the path cost from the root port on this Switch to the root switch.
Port ID This is the priority and number of the port on the Switch through which this Switch must
communicate with the root of the Spanning Tree.
Topology
Changed Times
This is the number of times the spanning tree has been reconfigured.
Time Since Last
Change
This is the time since the spanning tree was last reconfigured.
Port This field displays the number of the port on the Switch.
Port State This field displays the port state in STP.
• DISCARDING – The port does not forward or process received frames or learn MAC
addresses, but still listens for BPDUs.
• LEARNING – The port learns MAC addresses and processes BPDUs, but does NOT forward
frames yet.
• FORWARDING – The port is operating normally. It learns MAC addresses, processes BPDUs
and forwards received frames.
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