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FTOS Configuration Guide for the C-Series - Force10 Networks

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Confirm that a port is participating in Spanning Tree using <strong>the</strong> show spanning-tree 0 brief command from<br />

EXEC privilege mode.<br />

R1#show spanning-tree 0 brief<br />

Executing IEEE compatible Spanning Tree Protocol<br />

Root ID Priority 32768, Address 0001.e80d.2462<br />

We are <strong>the</strong> root of <strong>the</strong> spanning tree<br />

Root Bridge hello time 2, max age 20, <strong>for</strong>ward delay 15<br />

Bridge ID Priority 32768, Address 0001.e80d.2462<br />

Configured hello time 2, max age 20, <strong>for</strong>ward delay 15<br />

Interface Designated<br />

Name PortID Prio Cost Sts Cost Bridge ID PortID<br />

-------------- ------ ---- ---- --- ----- ----------------- ------<br />

Gi 1/1 8.496 8 4 DIS 0 32768 0001.e80d.2462 8.496<br />

Gi 1/2 8.497 8 4 DIS 0 32768 0001.e80d.2462 8.497<br />

Gi 1/3 8.513 8 4 FWD 0 32768 0001.e80d.2462 8.513<br />

Gi 1/4 8.514 8 4 FWD 0 32768 0001.e80d.2462 8.514<br />

R1#<br />

Figure 272 show spanning-tree brief Command Example<br />

Adding an Interface to <strong>the</strong> Spanning Tree Group<br />

To add a Layer 2 interface to <strong>the</strong> Spanning Tree topology:<br />

Task Command Syntax Command Mode<br />

Enable Spanning Tree on a Layer 2 interface. spanning-tree 0 INTERFACE<br />

Removing an Interface from <strong>the</strong> Spanning Tree Group<br />

To remove a Layer 2 interface from <strong>the</strong> Spanning Tree topology:<br />

Task Command Syntax Command Mode<br />

Disable Spanning Tree on a Layer 2 interface. no spanning-tree 0 INTERFACE<br />

In <strong>FTOS</strong> versions prior to 7.6.1.0, <strong>the</strong> command no spanning tree disables Spanning Tree on <strong>the</strong><br />

interface, however, BPDUs are still <strong>for</strong>warded to <strong>the</strong> RPM, where <strong>the</strong>y are dropped. Beginning in<br />

<strong>FTOS</strong> version 7.6.1.0, <strong>the</strong> command no spanning tree disables Spanning Tree on <strong>the</strong> interface, and<br />

incomming BPDUs are dropped at <strong>the</strong> line card instead of at <strong>the</strong> RPM, which frees processing<br />

resources. This behavior is called Layer 2 BPDU filtering and is available <strong>for</strong> STP, RSTP, PVST+, and<br />

MSTP.<br />

390 Spanning Tree Protocol

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