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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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Enabling Spanning Tree Protocol Globally<br />

Spanning Tree Protocol must be enabled globally; it is not enabled by default.<br />

To enable Spanning Tree globally <strong>for</strong> all Layer 2 interfaces:<br />

Step Task Command Syntax Command Mode<br />

1 Enter <strong>the</strong> PROTOCOL SPANNING TREE<br />

mode.<br />

Verify that Spanning Tree is enabled using <strong>the</strong> show config command from PROTOCOL SPANNING<br />

TREE mode.<br />

Figure 269 Verifying STP is Enabled<br />

When you enable Spanning Tree, all physical, VLAN, and port-channel interfaces that are enabled and in<br />

Layer 2 mode are automatically part of <strong>the</strong> Spanning Tree topology.<br />

• Only one path from any bridge to any o<strong>the</strong>r bridge participating in STP is enabled.<br />

• Bridges block a redundant path by disabling one of <strong>the</strong> link ports.<br />

protocol spanning-tree 0 CONFIGURATION<br />

2 Enable Spanning Tree. no disable PROTOCOL<br />

SPANNING TREE<br />

Note: To disable STP globally <strong>for</strong> all Layer 2 interfaces, enter <strong>the</strong> disable command from PROTOCOL<br />

SPANNING TREE mode.<br />

R1(conf)#protocol spanning-tree 0<br />

R1(config-span)#show config<br />

!<br />

protocol spanning-tree 0<br />

no disable<br />

R1#<br />

Indicates that Spanning Tree is enabled<br />

388 Spanning Tree Protocol

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