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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
164
Parameter Description
interface receives a BPDU later, its operation state changes to the non-port-
fast state.
By default, the Network option is used.
TCN Filter
Select to enable or disable the TCN Filter option. When a port is set to the TCN
filter mode, the TC event received by the port will be ignored. By default, this
option is disabled.
BPDU Forward
Select to enable or disable BPDU forwarding. If enabled, the received STP BPDU
will be forwarded to all VLAN member ports in the untagged form. By default, this
option is disabled.
Priority
Select the priority value here. Options to choose from are 0 to 240. By default, this
value is 128. A lower value has higher priority.
Hello Time
Enter the hello time value here. This value must be between 1 and 2 seconds. This
value specifies the interval that a designated port will wait between the periodic
transmissions of each configuration message.
Loop Guard
Select to enable or disable the Loop Guard feature on the specified port(s) here.
The STP Loop Guard feature provides additional protection against Layer 2
forwarding loops (STP loops). An STP loop is created when an STP blocking port
in a redundant topology erroneously transitions to the Forwarding state. This
usually happens because one of the ports in a physically redundant topology (not
necessarily the STP blocking port) no longer receives STP BPDUs. In its
operation, STP relies on continuous reception or transmission of BPDUs based on
the port role. The designated port transmits BPDUs, and the non-designated port
receives BPDUs.
When one of the ports in a physically redundant topology no longer receives
BPDUs, the STP considers the topology to be loop free. Eventually, an alternate
port that was previously a Blocking or Backup port becomes Designated and
moves to a Forwarding state. This situation creates a loop.
Click the Apply button to accept the changes made.
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