ZyXEL Communications MG1930-30, Руководство пользователя

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Chapter 13 Spanning Tree Protocol
XMG1930 Series User’s Guide
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The following table describes the labels in this screen.
Table 71 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 the base of the spanning tree (the 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. The root bridge determines
Hello Time , Max Age and Forwarding Delay .
Max Age (second) This is the maximum time (in seconds) the 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.
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.