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TRE
NDnet User’s Guid e
TPE-3012LS / TPE-3018LS
77
Spanning Tree (STP, RSTP, MSTP)
Configure Spanning Tree Protocol settings
Spanning Tree > Property
Spanning Tree Protocol (STP) provides network topology for any arrangement of
bridges/switches. STP also provides a single path between end stations on a network,
eliminating loops. Loops occur when alternate routes exist between hosts. Loops in an
extended network can cause bridges to forward traffic indefinitely, resulting in
increased traffic and reducing network efficiency.
1. Log into your switch management page (see “ Access your switch management page ”
on page 11).
2. Click on Spanning Tree and click on Property .
3. Review the settings. Click Apply to save changes.
•
State: Check the Enable option to enable spanning tree on the device. Uncheck
the option to disable spanning tree.
•
Operation Mode: Specifies the Spanning Tree Protocol (STP) mode to enable
on the switch. The possible field values are:
o
STP – Enables STP 802.1d on the device.
o
RSTP – Enables Rapid STP 802.1w on the device. This is the default
value.
o
MSTP – Enables Multiple STP 802.1s on the device.
•
Path Cost: Select the path cost range for calculation. This will depend on your
path cost calculation method.
o
Short – Range 1 - 65536
o
Long – Range 1 – 200,000,000
•
BPDU Handling
o
Filtering – If BPDU filtering is selected for spanning tree protocol, it
will check ports for sending and receiving BPDUs. If selecting filtering,
then all ports with edge devices such as workstations should have
BPDU Filter enabled under Spanning > Port Setting. Do not enable
BPDU filtering on ports that are connected to other switches that
would be BPDU spanning tree protocol information.
o
Flooding - If BPDU flooding is selected, this is the standad behavior
where are ports are flooded with BPDU information for the spanning
tree procotol topology or changes in STP topology.
•
Priority: The Bridge Priority has a range 0 to 61440 in increments of 4096.
Specify the increment that represents the desired bridge priority value.
•
Hello Time: The Hello Time is frequency with which the root bridge sends out a
BPDU.
•
Max Age: The Maximum Age defines the amount of time a port will wait for
STP/RSTP information. MSTP uses this parameter when interacting with
STP/RSTP domains on the boundary ports. Its range is 6 - 40 seconds
•
Forward Delay: The Forward Delay defines the time that the bridge spends in
the listening and learning states. Its range is 4 - 30 seconds.
•
Tx Hold Count: The Transmit Hold Count specifies the maximum number of
BPDUs that the bridge can send per second. Its range is 1 - 10.
•
Region Name: A configured name set on the switch to uniquely identify the
MST (Multiple Spanning Tree). If a configuration name is not set, this field
shows the MAC address of the device running MSTP.
•
Revision (0-65535): This value, together with the configuration name, and
identical vlans mapped for STP instance IDs identifies the MST region
configured on the switch.
•
Max Hop: The Max Hop Count is a parameter set in a BPDU packet when it
originates. It is decremented by 1each time it is retransmitted by the next
bridge. When the Hop Count value reaches zero, the bridge drops the BPDU
packet. Its range is 6 - 40 hops.
•
Bridge Identifier: Displays the current bridge priority along with the bridge
identifier (MAC Address).
•
Designated Root Bridge: Displays the MAC address of the currently designated
root bridge in the spanning tree protocol configuration.
•
Root Port: Displays the currently assigned root port in the STP topology.
•
Root Path Cost: Displays the current root path cost.
•
Topology Change Count: Displays the number times the STP topology has
changes since enabling the spanning tree protocol.