Cisco 813-RF - 813 Router Especificações Página 34

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CHAPTER 3
Spanning Tree
Bridge Protocol Data Units
Switches exchange Bridge Protocol Data Units (BPDU). The two types of BPDUs are Configuration and Topology
Change Notification(TCN). Configuration BPDUs are sent every two seconds from the root toward the downstream
switches. They:
n Are used during an election
n Maintain connectivity between switches
n Send timer information from the root
[ 34 ]
© 2010 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 112 for more details.
CCNP SWITCH 642-813 Quick Reference by Denise Donohue
FIGURE 3-2
The Active Topology
After Spanning Tree
Is Complete
A
BC
D
E
9781587140112.qxd 11/23/09 11:34 AM Page 34
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