Quidway S1700 Series Ethernet Switches
Web User Manual 7 Spanning Tree Algorithm
Issue 01 (2011-11-17) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
53
Figure 7-3 Displaying Global Settings for STP
Table 7-2 More Parameters of Global Settings for STP
Title Description
Bridge ID A unique identifier for this bridge, consisting of the bridge priority, and
MAC address (where the address is taken from the switch system).
Designated Root The priority and MAC address of the device in the Spanning Tree that
this switch has accepted as the root device.
Root Port The number of the port on this switch that is closest to the root. This
switch communicates with the root device through this port. If there is
no root port, then this switch has been accepted as the root device of the
Spanning Tree network.
Root Path Cost The path cost from the root port on this switch to the root device.
Topology
changes
The number of times the Spanning Tree has been reconfigured.
Last Topology
Change
Time since the Spanning Tree was last reconfigured.
Hello Time Interval (in seconds) at which the root device transmits a configuration
message.
z
Default: 2
z
Minimum: 1
z
Maximum: The lower of 10 or [(Max. Message Age / 2) -1]
Max Age The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure. All device
ports (except for designated ports) should receive configuration
messages at regular intervals. Any port that ages out STP information
(provided in the last configuration message) becomes the designated
port for the attached LAN. If it is a root port, a new root port is selected
from among the device ports attached to the network.
z
Default: 20
z
Minimum: The higher of 6 or [2 x (Hello Time + 1)]
z
Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
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