Mst Configuration Identification - D-Link DGS-3120-24TC Product Manual

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
P2P
Restricted TCN
Migrate
Port STP
Forward BPDU
Edge
Restricted Role
Click the Apply button to accept the changes made.

MST Configuration Identification

This window allows the user to configure a MSTI instance on the Switch. These settings will uniquely identify a
multiple spanning tree instance set on the Switch. The Switch initially possesses one CIST, or Common Internal
Spanning Tree, of which the user may modify the parameters for but cannot change the MSTI ID for, and cannot be
deleted.
To view the following window, click L2 Features > Spanning Tree > MST Configuration Identification, as show
below:
The fields that can be configured are described below:
Choosing the True parameter indicates a point-to-point (P2P) shared link. P2P ports
are similar to edge ports; however they are restricted in that a P2P port must operate
in full duplex. Like edge ports, P2P ports transition to a forwarding state rapidly thus
benefiting from RSTP. A P2P value of False indicates that the port cannot have P2P
status. Auto allows the port to have P2P status whenever possible and operate as if
the P2P status were True. If the port cannot maintain this status, (for example if the
port is forced to half-duplex operation) the P2P status changes to operate as if the
P2P value were False. The default setting for this parameter is Auto.
Topology Change Notification is a simple BPDU that a bridge sends out to its root
port to signal a topology change. Restricted TCN can be toggled between True and
False. If set to True, this stops the port from propagating received topology change
notifications and topology changes to other ports. The default is False.
When operating in RSTP mode, selecting Yes forces the port that has been selected
to transmit RSTP BPDUs.
This drop-down menu allows you to enable or disable STP for the selected group of
ports. The default is Enabled.
Use the pull-down menu to enable or disable the flooding of BPDU packets when
STP is disabled.
Choosing the True parameter designates the port as an edge port. Edge ports cannot
create loops, however an edge port can lose edge port status if a topology change
creates a potential for a loop. An edge port normally should not receive BPDU
packets. If a BPDU packet is received, it automatically loses edge port status.
Choosing the False parameter indicates that the port does not have edge port status.
Alternatively, the Auto option is available.
Use the drop-down menu to toggle Restricted Role between True and False. If set to
True, the port will never be selected to be the Root port. The default is False.
Figure 4–30 MST Configuration Identification window
81