ZyXEL Communications XS3800-28, User Manual, Page: 397 / 789

Chapter 54 Spanning Tree Protocol
XS3800-28 User’s Guide
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Hello Time
(seconds) This is the time interval (in seconds) at which the root switch transmits a configuration
message. The root bridge determines
Hello Time , Max Age and Forwarding Delay .
Max Age
(seconds) This is the maximum time (in seconds) the Switch can wait without receiving a configuration
message before attempting to reconfigure.
Forwarding Delay
(seconds) 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
Instance This field displays the MSTI ID.
VLAN This field displays which VLANs are mapped to an MSTI.
MSTI
MSTI Select the MST instance settings you want to view.
Regional 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
Regional 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.
SLOT This field appears only in Stacking mode. Click the drop-down list to choose the slot number
of the Switch in a stack.
Port This field displays the number of the port on the Switch. In Stacking mode, the first number
represents the slot ID and the second is the port number.
Port State This field displays the port state in STP.
• DISCARDING – The port does not forward or process received frames or learn MAC
addresses, but still listens for BPDUs.
• LEARNING – The port learns MAC addresses and processes BPDUs, but does not forward
frames yet.
• FORWARDING – The port is operating normally. It learns MAC addresses, processes BPDUs
and forwards received frames.
Table 190 SWITCHING > Spanning Tree Protocol > Spanning Tree Protocol Status: MSTP (continued)
LABEL DESCRIPTION