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FTOS Configuration Guide for the C-Series - Force10 Networks

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R3#show spanning-tree rstp brief<br />

Executing IEEE compatible Spanning Tree Protocol<br />

Root ID Priority 32768, Address 0001.e801.cbb4<br />

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

Bridge ID Priority 32768, Address 0001.e80f.1dad<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 3/1 128.681 128 20000 BLK 20000 32768 0001.e80b.88bd 128.469<br />

Gi 3/2 128.682 128 20000 BLK 20000 32768 0001.e80b.88bd 128.470<br />

Gi 3/3 128.683 128 20000 FWD 20000 32768 0001.e801.cbb4 128.379<br />

Gi 3/4 128.684 128 20000 BLK 20000 32768 0001.e801.cbb4 128.380<br />

Interface<br />

Name Role PortID Prio Cost Sts Cost Link-type Edge<br />

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

Gi 3/1 Altr 128.681 128 20000 BLK 20000 P2P No<br />

Gi 3/2 Altr 128.682 128 20000 BLK 20000 P2P No<br />

Gi 3/3 Root 128.683 128 20000 FWD 20000 P2P No<br />

Gi 3/4 Altr 128.684 128 20000 BLK 20000 P2P No<br />

R3#<br />

Figure 297 show spanning-tree rstp brief Command Example<br />

Add and Remove Interfaces<br />

• To add an interface to <strong>the</strong> Rapid Spanning Tree topology, configure it <strong>for</strong> Layer 2 and it is<br />

automatically added. If you previously disabled RSTP on <strong>the</strong> interface using <strong>the</strong> command no<br />

spanning-tree 0, re-enable it using <strong>the</strong> command spanning-tree 0.<br />

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

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

behavior.<br />

Modify Global Parameters<br />

You can modify Rapid Spanning Tree parameters. The root bridge sets <strong>the</strong> values <strong>for</strong> <strong>for</strong>ward-delay,<br />

hello-time, and max-age and overwrites <strong>the</strong> values set on o<strong>the</strong>r bridges participating in <strong>the</strong> Rapid Spanning<br />

Tree group.<br />

• Forward-delay is <strong>the</strong> amount of time an interface waits in <strong>the</strong> Listening State and <strong>the</strong> Learning State<br />

be<strong>for</strong>e it transitions to <strong>the</strong> Forwarding State.<br />

• Hello-time is <strong>the</strong> time interval in which <strong>the</strong> bridge sends RSTP Bridge Protocol Data Units (BPDUs).<br />

• Max-age is <strong>the</strong> length of time <strong>the</strong> bridge maintains configuration in<strong>for</strong>mation be<strong>for</strong>e it refreshes that<br />

in<strong>for</strong>mation by recomputing <strong>the</strong> RST topology.<br />

Note: <strong>Force10</strong> <strong>Networks</strong> recommends that only experienced network administrators change <strong>the</strong> Rapid<br />

Spanning Tree group parameters. Poorly planned modification of <strong>the</strong> RSTG parameters can negatively<br />

impact network per<strong>for</strong>mance.<br />

414 Rapid Spanning Tree Protocol

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