User manual

C HAPTER 8 | Spanning Tree Algorithm
Configuring Global Settings for STA
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ES-2000 Series
◆ 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.)
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Default: 20
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Minimum: The higher of 6 or [2 x (Hello Time + 1)]
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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.
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Default: 15
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Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
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Maximum: 30
WEB INTERFACE
To configure global STA settings:
1. Click Spanning Tree, STA.
2. Select Configure Global from the Step list.
3. Select Configure from the Action list.
4. Modify any of the required attributes. Note that the parameters
displayed for the spanning tree types (STP and RSTP) varies as
described in the preceding section.
5. Click Apply