AMX NXA-ENET24 Instruction Manual page 140

Configuring the Switch
Command Attributes
Basic Configuration of Global Settings
Root Device Configuration
124
Spanning Tree State – Enables/disables STA on this switch. (Default: Enabled)
Spanning Tree Type – Specifies the type of spanning tree used on this switch:
STP: Spanning Tree Protocol (IEEE 802.1D; i.e., when this option is selected, the
switch will use RSTP set to STP forced compatibility mode)
RSTP: Rapid Spanning Tree (IEEE 802.1w) RSTP is the default.
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.
Default: 32768
Range: 0-61440, in steps of 4096
Options: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, 61440
Hello Time – Interval (in seconds) at which this device transmits a configuration
message.
Default: 2
Minimum: 1
Maximum: The lower of 10 or [(Max. Message Age / 2) -1]
Maximum Age – The maximum time (in seconds) a 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. Any port
that ages out STA information (provided in the last configuration message) becomes the
designated port for the attached LAN. If it is a root port, a new root port is selected from
among the device ports attached to the network. (References to "ports" in this section
mean "interfaces," which includes both ports and trunks.)
Default: 20
Minimum: The higher of 6 or [2 x (Hello Time + 1)].
Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
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.
Default: 15
NXA-ENET Software Management Guide