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z Within an MST region, the packet is forwarded along the corresponding MSTI.
z Between two MST regions, the packet is forwarded along the CST.
Implementation of MSTP on Devices
MSTP is compatible with STP and RSTP. STP and RSTP protocol packets can be recognized by
devices running MSTP and used for spanning tree calculation.
In addition to basic MSTP functions, many special functions are provided for ease of management, as
follows:
z Root bridge hold
z Root bridge backup
z Root guard
z BPDU guard
z Loop guard
z TC-BPDU guard
z BPDU dropping
Protocols and Standards
MSTP is documented in:
z IEEE 802.1d: Spanning Tree Protocol
z IEEE 802.1w: Rapid Spanning Tree Protocol
z IEEE 802.1s: Multiple Spanning Tree Protocol
MSTP Configuration Task List
Before configuring MSTP, you need to know the role of each device in each MSTI: root bridge or leave
node. In each MSTI, one, and only one device acts as the root bridge, while all others as leaf nodes.
Complete these tasks to configure MSTP:
Task Remarks
Configuring an MST Region Required
Configuring the Root Bridge or a Secondary Root Bridge Optional
Configuring the Work Mode of an MSTP Device Optional
Configuring the Priority of a Device Optional
Configuring the Maximum Hops of an MST Region Optional
Configuring the Network Diameter of a Switched Network Optional
Configuring Timers of MSTP Optional
Configuring the Timeout Factor Optional
Configuring the Maximum Port Rate Optional
Configuring Ports as Edge Ports Optional
Configuring the Link Type of Ports Optional
Configuring the Mode a Port Uses to Recognize/Send
MSTP Packets
Optional
Configuring the
root bridge
Enabling the Output of Port State Transition Information Optional
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