Software User Manual
D-Link Unified Access System
12/10/09
Document
34CSFP6XXUWS-SWUM100-D7
Configuring Spanning Tree Protocol
Page 249
Bridge Hello Time (secs)
Specifies the switch Hello time, which indicates the amount of time in seconds a root
bridge waits between configuration messages. The valid range is 1-10, and the default
value is 2. The value must be less than or equal to (Bridge Max Age / 2) – 1. The
default hello time value is 2.
Bridge Forward Delay (secs)
Specifies the switch forward delay time, which indicates the amount of time in seconds
a bridge remains in a listening and learning state before forwarding packets. The value
must be greater or equal to (Bridge Max Age / 2) + 1. The time range is from 4 seconds
to 30 seconds. The default value is 15.
Spanning Tree Maximum Hops
Specifies the maximum number of bridge hops the information for a particular CST
instance can travel before being discarded.
BPDU Guard
Enable or disable the BPDU Guard.The switches behind the edge ports that have
BPDU guard enabled will not be able to influence the overall STP topology. Using the
BPDU Guard feature can help enforce the STP domain borders and keep the active
topology be consistent and predictable.
BPUD Filter
Enable or disable the BPDU Filter. When BPDU filtering is enabled, the port drops the
BPDUs received.
Spanning Tree Tx Hold Count
Configure the maximum number of BPDUs the bridge is allowed to send within the
hello time window.The default value is 6.
Bridge Identifier
The bridge identifier for the CST. It is made up using the bridge priority and the base
MAC address of the bridge.
Time Since Topology Change
Displays the total amount of time since the last topographic change. The time is
displayed in hour/minute/second format, for example, 5 hours 10 minutes and 4
seconds.
Topology Changes Counts
Displays the total amount of STP state changes that have occurred.
Topology Change
Indicates whether a topology change is in progress on any port assigned to the CST.
The possible values are True or False.
Designated Root
Displays the bridge identifier of the root bridge, which is made up from the bridge
priority and the base MAC address of the bridge.
Root Path Cost
Displays the cost of the path from this bridge to the designated root.
Root Port
Indicates the root port of the selected instance.
Max Age
Shows the path Cost to the Designated Root for the CST.
Forward Delay
Shows the derived value of the Root Port Bridge Forward Delay parameter.
Hold Time
Indicates the minimum time between transmission of Configuration BPDUs.
CST Regional Root
Shows the priority and base MAC address of the CST Regional Root.
CST Path Cost
Shows the path Cost to the CST tree Regional Root.
Table 151: Spanning Tree CST Configuration/Status Fields (Cont.)
Field
Description