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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
The following fields can be set:
Parameter Description
Spanning Tree
Protocol <Enabled>
This field can be toggled between Enabled and Disabled
using the pull-down menu. This will enable or disable the
Spanning Tree Protocol (STP), globally, for the switch.
Max Age: (6 .. 40
sec) <20 >
The Max. Age can be set from 6 to 40 seconds. At the end
of the Max. Age, if a BPDU has still not been received from
the Root Bridge, your Switch will start sending its own
BPDU to all other Switches for permission to become the
Root Bridge. If it turns out that your Switch has the lowest
Bridge Identifier, it will become the Root Bridge.
Hello Time: (1 .. 10
sec) < 2 >
The Hello Time can be set from 1 to 10 seconds. This is the
interval between two transmissions of BPDU packets sent
by the Root Bridge to tell all other Switches that it is indeed
the Root Bridge.
Forward Delay: (4
.. 30 sec) <15 >
The Forward Delay can be from 4 to 30 seconds. This is the
time any port on the Switch spends in the listening state
while moving from the blocking state to the forwarding
state.
Bridge Priority: (0
.. 65535) <32768>
A Priority for the switch can be set from 0 to 65535. This
number is used in the voting process between switches on
the network to determine which switch will be the root
switch. A low number indicates a high priority, and a high
probability that this switch will be elected as the root
switch.
The Hello Time cannot be longer than the Max. Age. Otherwise, a configuration
error will occur.
Observe the following formulas when setting the above parameters:
Max. Age ≤ 2 x (Forward Delay - 1 second)
Max. Age ≥ 2 x (Hello Time + 1 second)
Configure STP Groups
To define which ports will be members of an STP Group, highlight Group Create/Delete and press
Enter.
Figure 7-57. Spanning Tree Groups window
To delete an existing spanning tree group, click the X icon in the Delete column corresponding to the
entry you want to delete.
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