Chapter 11 Spanning Tree Protocol
GS3700/XGS3700 Series User’s Guide
155
The following table describes the labels in this screen.
Table 64 Advanced Application > Spanning Tree Protocol > Status: MSTP
LABEL DESCRIPTION
Configuration Click Configuration to specify which STP mode you want to activate. Click MSTP to edit
MSTP settings on the Switch.
CST This section describes the Common Spanning Tree settings.
Bridge Root refers to t he base of t he spanning t ree (t he root bridge). Our Bridge is this Switch.
This Switch may also be the root bridge.
Bridge ID This is the unique identifier for this bridge, consisting of bridge priority plus MAC address.
This ID is the same for Root and Our Bridge if the Switch is the root switch.
Hello Time
(second)
This is the time interval (in seconds) at which the root switch transmits a configuration
message.
Max Age (second) This is the maximum time (in seconds) a switch can wait without receiving a
configuration message before attempting to reconfigure.
Forwarding Delay
(second)
This is the time (in seconds) the root switch will wait before changing states (that is,
listening to learning to forwarding).
Cost to Bridge This is the path cost from the root port on this Switch to the root switch.
Port ID This is the priority and number of the port on the Switch through which this Switch must
communicate with the root of the Spanning Tree.
Configuration
Name
This field displays the configuration name for this MST region.
Revision Number This field displays the revision number for this MST region.
Configuration
Digest
A configuration digest is generated from the VLAN-MSTI mapping information.
This field displays the 16-octet signature that is included in an MSTP BPDU. This field
displays the digest when MSTP is activated on the system.
Topology Changed
Times
This is the number of times the spanning tree has been reconfigured.
Time Since Last
Change
This is the time since the spanning tree was last reconfigured.
Instance: These fields display the MSTI to VLAN mapping. In other words, which VLANs run on each
spanning tree instance.
Instance This field displays the MSTI ID.
VLAN This field displays which VLANs are mapped to an MSTI.
MSTI Select the MST instance settings you want to view.
Bridge Root refers to the base of the MST instance. Our Bridge is this Switch. This Switch may
also be the root bridge.
Bridge ID This is the unique identifier for this bridge, consisting of bridge priority plus MAC address.
This ID is the same for Root and Our Bridge if the Switch is the root switch.
Internal Cost This is the path cost from the root port in this MST instance to the regional root switch.
Port ID This is the priority and number of the port on the Switch through which this Switch must
communicate with the root of the MST instance.
Port This field displays the number of the port on the Switch.
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