SMC Networks 100BASE-TX, 16 10BASE-T manual Spanning-tree mode, Rstp

4 Command Line Interface

an STA-compliant switch, bridge or router) in your 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:

Console(config)#spanning-tree

Console(config)#

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.

•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:

Console(config)#spanning-tree mode rstp

Console(config)#

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