Mst Configuration Identification - D-Link DGS-3630 Series Reference Manual

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide
Parameter
TCN Filter
BPDU Forward
Priority
Hello Time
Loop Guard
Click the Apply button to accept the changes made.

MST Configuration Identification

This window is used to display and configure the MST configuration identification settings. These settings will uniquely
identify an MSTI configured on the Switch. The Switch initially possesses one Common Internal Spanning Tree (CIST)
of which the user may modify the parameters for but cannot change or delete the MSTI ID.
To view the following window, click L2 Features > STP > MST Configuration Identification, as shown below:
Description
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.
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.
Select the priority value here. Options to choose from are 0 to 240. By default
this option is 0. A lower value has higher priority.
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.
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.
Figure 5-18 MST Configuration Identification Window
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