Implementation of MSTP on devices
MSTP is compatible with STP and RSTP. Devices that are running MSTP and that are used for spanning
tree calculation can identify STP and RSTP protocol packets.
In addition to basic MSTP functions, the following functions are provided for ease of management:
Root bridge hold
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Root bridge backup
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Root guard
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BPDU guard
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Loop guard
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TC-BPDU guard
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BPDU drop
Protocols and standards
The spanning tree protocols are documented in the following standards:
IEEE 802.1d, Media Access Control (MAC) Bridges
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IEEE 802.1w, Part 3: Media Access Control (MAC) Bridges—Amendment 2: Rapid Reconfiguration
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IEEE 802.1s, Virtual Bridged Local Area Networks—Amendment 3: Multiple Spanning Trees
Spanning tree configuration task list
Before configuring a spanning tree, you must determine the spanning tree protocol to be used (STP, RSTP,
PVST, or MSTP) and plan the device roles (the root bridge or leaf node).
Complete the following tasks to configure STP:
Task
Configuring the
root bridge
Setting the spanning tree mode
Configuring the root bridge or a secondary root bridge
Configuring the device priority
Configuring the network diameter of a switched network
Configuring spanning tree timers
Configuring the timeout factor
Configuring the maximum port rate
Configuring the mode a port uses to recognize/send MSTP
packets
Enabling the output of port state transition information
Enabling the spanning tree feature
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Remarks
Required
Configure the device to work
in STP-compatible mode.
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Optional
Required