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PANNING
T
REE
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OMMANDS
4-169
network to ensure that only one route exists between any two stations
on the network, and provide backup links which automatically take over
when a primary link goes down.
Example
This example shows how to enable the Spanning Tree Algorithm for the
switch.
spanning-tree mode
This command selects the spanning tree mode for this switch. Use the no
form to restore the default.
Syntax
spanning-tree mode {stp | rstp}
no spanning-tree mode
• stp - Spanning Tree Protocol (IEEE 802.1D)
• rstp - Rapid Spanning Tree Protocol (IEEE 802.1w)
Default Setting
rstp
Command Mode
Global Configuration
Command Usage
• Spanning Tree Protocol
Uses RSTP for the internal state machine, but sends only 802.1D
BPDUs. This creates one spanning tree instance for the entire
network. If multiple VLANs are implemented on a network, the path
between specific VLAN members may be inadvertently disabled to
prevent network loops, thus isolating group members.
• Rapid Spanning Tree Protocol
RSTP supports connections to either STP or RSTP nodes by
monitoring the incoming protocol messages and dynamically
Console(config)#spanning-tree
Console(config)#