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after the migration delay expires, RSTP restarts the migration delay timer and begins using
RSTP BPDUs on that port.
◆
Multiple Spanning Tree Protocol
MSTP generates a unique spanning tree for each instance. This provides multiple
pathways across the network, thereby balancing the traffic load, preventing wide-scale
disruption when a bridge node in a single instance fails, and allowing for faster
convergence of a new topology for the failed instance.
■ To allow multiple spanning trees to operate over the network, you must configure a
related set of bridges with the same MSTP configuration, allowing them to participate in a
specific set of spanning tree instances.
■ A spanning tree instance can exist only on bridges that have compatible VLAN instance
assignments.
■ Be careful when switching between spanning tree modes. Changing modes stops all
spanning-tree instances for the previous mode and restarts the system in the new mode,
temporarily disrupting user traffic.
PARAMETERS
These parameters are displayed:
Basic Settings
◆
Protocol Version
– Specifies the type of spanning tree used on this switch. (Options: STP,
RSTP, MSTP; Default: MSTP)
■ STP: Spanning Tree Protocol (IEEE 802.1D); i.e., the switch will use RSTP set to STP
forced compatibility mode.
■ RSTP: Rapid Spanning Tree (IEEE 802.1w)
■ MSTP: Multiple Spanning Tree (IEEE 802.1s); This is the default.
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1. STP and RSTP BPDUs are transmitted as untagged frames, and will cross any VLAN
boundaries.
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◆
Bridge Priority
– Bridge priority is used in selecting the root device, root port, and
designated port. The device with the highest priority becomes the STA root device.
However, if all devices have the same priority, the device with the lowest MAC address will
then become the root device. (Note that lower numeric values indicate higher priority.)
■ Default: 128
■ Range: 0-240, in steps of 16
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