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LGB5128A User Manual
58
Restricted Role :
If enabled, this causes the port not to be selected as Root Port for the CIST or
any MSTI, even if it has the best spanning tree priority vector. Such a port will
be selected as an Alternate Port after the Root Port has been selected. If set, it
can cause lack of spanning tree connectivity. It can be set by a network
administrator to prevent bridges external to a core region of the network fromj
influencing the spanning tree active topology, possibly because those bridges
are not under the full control of the administrator. This feature is also known as
Root Guard.
Restricted TCN :
If enabled, this causes the port not to propagate received topology change
notifications and topology changes to other ports. If set, it can cause
temporary loss of connectivity after changes in a spanning tree's active
topology as a result of persistently incorrect learned station location
information. It is set by a network administrator to prevent bridges external to
a core region of the network, causing address flushing in that region, possibly
because those bridges are not under the full control of the administrator or the
physical link state of the attached LANs transits frequently.
BPDU Guard :
If enabled, this causes the port to disable itself upon receiving valid BPDUs.
Contrary to the similar bridge setting, the port Edge status does not affect this
setting. A port entering error-disabled state due to this setting is subject to the
bridge Port Error Recovery setting as well.
Point to Point
Controls whether the port connects to a point-to-point LAN rather than to a
shared medium. This can be automatically determined, or forced either true or
false. Transition to the forwarding state is faster for point-to-point LANs than
for shared media.
Buttons
Save – Click to save changes.
Reset- Click to undo any changes made locally and revert to previously saved
values.
3-4.5 MSTI Ports
The section describes how to inspect the current STP MSTI port configurations, and possibly
change them as well.
An MSTI port is a virtual port, which is initiated separately for each active CIST (physical) port
for each MSTI instance configured on and applicable to the port. The MSTI instance must be
selected before displaying actual MSTI port configuration options. It contains MSTI port
settings for physical and aggregated ports. The aggregation settings are stack global.
Web Interface
To configure the Spanning Tree MSTI Port Configuration parameters in the Web interface:
1. Click Configuration, Spanning Tree, MSTI Ports.
2. Scroll to select the MST1 or other MSTI Port.
3. Click Get to set the detail parameters of the MSTI Ports.
4. Scroll to set all parameters of the MSTI Port configuration.
5. Click the save button to save the setting.
6. If you want to cancel the setting, then you need to click the Reset button.
It will revert to previously saved values