ExtremeSwitching 200 Series, Administration Manual

Page: 229 / 369

Table 231: Spanning Tree CST Port Fields (continued)
Field Description
TCN Guard When 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 Identifies whether the interface is currently in a loop inconsistent state. 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.
•
If you make any configuration changes, click Submit to apply the new settings to the switch.
•
Click Cancel to cancel the change.
•
Click Refresh to update the screen with most recent data.
MST Configuration
Use the MST Configuration page to view and configure the MSTI (Multiple Spanning Tree Instances) s on
the device. 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.
•
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.
To display the Spanning Tree MST Summary page, click Switching > Spanning Tree > MST in the
navigation menu.
Table 232: Spanning Tree MST Summary Fields
Field Description
MST ID The number that identifies the MST instance.
Priority The bridge priority for the spanning-tree instance. This value affects the
likelihood that the bridge is selected as the
root bridge . A lower value increases
the probability that the bridge is selected as the root bridge.
# of Associated VLANs The number of VLANs that are mapped to the MSTI. This number does not
contain any information about the VLAN IDs that are mapped to the instance.
Configuring Switching Information
ExtremeSwitching 200 Series: Administration Guide 229