SMC Networks SMC TigerStack III SMC6824MPE - Manual (Page 475)

S
PANNING
T
REE
C
OMMANDS
4-213
Command Usage
• Spanning Tree Protocol
Uses RSTP for the internal state machine, but sends only 802.1D
BPDUs.
• Rapid Spanning Tree Protocol
RSTP supports connections to either STP or RSTP nodes by monitoring
the incoming protocol messages and dynamically adjusting the type of
protocol messages the RSTP node transmits, as described below:
- STP Mode – If the switch receives an 802.1D BPDU after a port’s
migration delay timer expires, the switch assumes it is connected to an
802.1D bridge and starts using only 802.1D BPDUs.
- RSTP Mode – If RSTP is using 802.1D BPDUs on a port and receives
an RSTP BPDU after the migration delay expires, RSTP restarts the
migration delay timer and begins using RSTP BPDUs on that port.
Example
The following example configures the switch to use Rapid Spanning Tree.
spanning-tree forward-time
Use this command to configure the spanning tree bridge forward time
globally for this switch. Use the no form to restore the default.
Syntax
spanning-tree forward-time seconds
no spanning-tree forward-time
seconds - Time in seconds. (Range: 4 - 30 seconds)
The minimum value is the higher of 4 or [(max-age / 2) + 1].
Default Setting
15 seconds
Command Mode
Global Configuration
Console(config)#spanning-tree mode rstp
Console(config)#