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FTOS Configuration Guide for the C-Series - Force10 Networks

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Enable Multiple Spanning Tree Globally<br />

MSTP is not enabled by default. To enable MSTP:<br />

Step Task Command Syntax Command Mode<br />

1 Enter PROTOCOL MSTP mode. protocol spanning-tree mstp CONFIGURATION<br />

2 Enable MSTP. no disable PROTOCOL MSTP<br />

Verify that MSTP is enabled using <strong>the</strong> show config command from PROTOCOL MSTP mode, as shown<br />

in Figure 301.<br />

Figure 301 Verifying MSTP is Enabled<br />

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

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

!<br />

protocol spanning-tree mstp<br />

no disable<br />

R1#<br />

When you enable MSTP, all physical, VLAN, and port-channel interfaces that are enabled and in Layer 2<br />

mode are automatically part of <strong>the</strong> MSTI 0.<br />

• Within an MSTI, only one path from any bridge to any o<strong>the</strong>r bridge is enabled.<br />

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

Add and Remove Interfaces<br />

• To add an interface to <strong>the</strong> MSTP topology, configure it <strong>for</strong> Layer 2 and add it to a VLAN. If you<br />

previously disabled MSTP on <strong>the</strong> interface using <strong>the</strong> command no spanning-tree 0, re-enable it using<br />

<strong>the</strong> command spanning-tree 0.<br />

• Remove an interface from <strong>the</strong> MSTP topology using <strong>the</strong> command no spanning-tree 0 command. See<br />

also Removing an Interface from <strong>the</strong> Spanning Tree Group on page 390 <strong>for</strong> BPDU Filtering behavior.<br />

Create Multiple Spanning Tree Instances<br />

A single MSTI provides no more benefit than RSTP. To take full advantage of MSTP you must create<br />

multiple MSTIs and map VLANs to <strong>the</strong>m.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 421

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