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MSTP implementation 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, the device provides the following functions for ease of management:
• Root bridge hold
• Root bridge backup
• Root guard
• BPDU guard
• Loop guard
• TC-BPDU (a message that notifies the device of topology changes) guard
Protocols and standards
MSTP is documented in the following protocols and standards:
• IEEE 802.1d, Spanning Tree Protocol
• IEEE 802.1w, Rapid Spanning Tree Protocol
• IEEE 802.1s, Multiple Spanning Tree Protocol
Configuration restrictions and guidelines
When you configure MSTP, follow these restrictions and guidelines:
• Two or more spanning tree devices belong to the same MST region only if they are configured to
have the same MST region name, MST region level, and the same VLAN-to-instance mapping
entries in the MST region, and they are connected through a physical link.
• If two or more devices are selected as the root bridge in a spanning tree at the same time, the device
with the lowest MAC address is chosen.
• If BPDU guard is disabled, a port set as an edge port becomes a non-edge port again if it receives
a BPDU from another port. To restore its port role as an edge port, you must restart the port.
• If a port directly connects to a user terminal, configure it as an edge port and enable BPDU guard
for it. This enables the port to quickly transit to the forwarding state and ensures network security.
Recommended MSTP configuration procedure
Ste
Remarks
1. Configuring an MST region
Optional.
Configure the MST region-related parameters and VLAN-to-instance
mappings.
By default, the MST region-related parameters adopt the default values, and
all VLANs in an MST region are mapped to MSTI 0.
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