166
Configuring Switching Information
EdgeSwitch
™
Administration Guide
Ubiquiti Networks, Inc.
Spanning Tree CST Port Fields (Continued)
Field
Description
Topology Change
Acknowledge
Displays
True
if the next BPDU to be transmitted for this port will have the topology change
acknowledgement flag set; otherwise, displays
False
.
Auto Edge
When this option is selected (enabled),
Auto Edge
allows the interface to become an edge port if it
does not receive any BPDUs within a given amount of time.
Edge Port
Displays
Enabled
if the interface is configured as an edge port; otherwise, displays
Disabled
.
Point-to-point MAC
Displays
True
if the link type for the interface is a point-to-point link; otherwise, displays
False
.
Root Guard
When this option is selected (enabled),
Root Guard
allows the interface to discard any superior
information it receives to protect the root of the device from changing. The port gets put into
discarding state and does not forward any frames.
Loop Guard
When this option is selected (enabled),
Loop Guard
prevents an interface from erroneously
transitioning from blocking state to forwarding when the interface stops receiving BPDUs. The port is
marked as being in loop-inconsistent state. In this state, the interface does not forward frames.
TCN Guard
When this option is selected (enabled),
TCN Guard
restricts the interface from propagating any
topology change information received through that interface.
CST Regional Root
The bridge ID of the bridge that has been elected as the root bridge of the CST region.
CST Path Cost
The path cost from the interface to the CST regional root.
Loop Inconsistent State
Displays
True
if the interface is currently in a loop inconsistent state; otherwise, displays
False
.
An interface transitions to a loop inconsistent state if loop guard is enabled and the port stops
receiving BPDUs. In this state, the interface does not transmit frames.
Transitions Into
LoopInconsistent State
The number of times this interface has transitioned into loop inconsistent state.
Transitions Out Of
LoopInconsistent State
The number of times this interface has transitioned out of loop inconsistent state.
Use the buttons to perform the following tasks:
• To edit the CST port settings, click
Edit
, configure the settings as needed, and click
Submit
to apply the
new settings to the switch.
• Click
Details
to display the CST port settings.
• Click
Refresh
to update the screen with most recent data.
To retain the changes across the switch’s next power cycle, click
System
>
Configuration Storage
>
Save
.
Spanning Tree MST Configuration
Use the
Spanning Tree MST Summary
page to view and configure the Multiple Spanning Tree Instances
(MSTIs) on the device. Multiple Spanning Tree Protocol (MSTP) allows the creation of MSTIs based upon a
VLAN or groups of VLANs. Configuring MSTIs creates an active topology with a better distribution of network
traffic and an increase in available bandwidth when compared to classic STP.
To display the
Spanning Tree MST Port Summary
page, click
Switching
>
Spanning Tree
>
MST
in the
navigation menu.
Use the buttons to perform the following tasks:
• To configure a new MSTI, click
Add
and specify the desired settings.
• To change the Priority or the VLAN associations for an existing MSTI, select the entry to modify and
click Edit
.
• To remove one or more MSTIs, select each entry to delete and click
Remove
. You must confirm the action
before the entry is deleted.
