Spanning Tree Algorithm Configuration
3-113
•
Designated Root
– The priority and MAC address of the device in the Spanning
Tree that this switch has accepted as the root device.
•
Root Port
– The number of the port on this switch that is closest to the root. This
switch communicates with the root device through this port. If there is no root
port, then this switch has been accepted as the root device of the Spanning Tree
network.
•
Root Path Cost
– The path cost from the root port on this switch to the root
device.
•
Configuration Changes
– The number of times the Spanning Tree has been
reconfigured.
•
Last Topology Change
– Time since the Spanning Tree was last reconfigured.
These additional parameters are only displayed for the CLI:
•
Spanning tree mode
– Specifies the type of spanning tree used on this switch:
•
STP
: Spanning Tree Protocol (IEEE 802.1D)
•
RSTP
: Rapid Spanning Tree (IEEE 802.1w)
• Priority – Bridge priority is used in selecting the root device, root port, and
designated port. The device with the highest priority becomes the STA root device.
However, if all devices have the same priority, the device with the lowest MAC
address will then become the root device.
•
Root Hello Time
– Interval (in seconds) at which this device transmits a
configuration message.
•
Root Maximum Age
– The maximum time (in seconds) this device can wait
without receiving a configuration message before attempting to reconfigure. All
device ports (except for designated ports) should receive configuration messages
at regular intervals. If the root port ages out STA information (provided in the last
configuration message), a new root port is selected from among the device ports
attached to the network. (References to “ports” in this section means “interfaces,”
which includes both ports and trunks.)
•
Root Forward Delay
– The maximum time (in seconds) this device will wait before
changing states (i.e., discarding 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.
Summary of Contents for 8124PL2
Page 1: ...MANAGEMENT GUIDE TigerSwitchTM 10 100 1000 24 Port Managed Switch with PoE SMC8124PL2 ...
Page 2: ......
Page 20: ...xvi Contents ...
Page 27: ...xxiii Figures ...
Page 35: ...Introduction 1 8 1 ...
Page 45: ...Initial Configuration 2 10 2 ...
Page 148: ...Port Configuration 3 103 Figure 3 61 Displaying Etherlike and RMON Statistics ...
Page 473: ...Command Line Interface 4 240 4 ...
Page 477: ...Software Specifications A 4 A ...
Page 489: ...Index Index 4 menu list 3 3 panel display 3 3 ...
Page 490: ......