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CCNA Discovery 3 - Chapter 3
- 1. Switching in an
Enterprise Network
Introducing Routing and Switching in the Enterprise –
Chapter 3
Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
- 2. Objectives
Compare the types of switches used in an enterprise
network.
Explain how Spanning Tree Protocol prevents
switching loops.
Describe and configure VLANs on a Cisco switch.
Describe and configure trunking and Inter-VLAN
routing.
Maintain VLANs in an enterprise network.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
- 3. Compare the Types of Switches Used in an
Enterprise Network
Switching and network segmentation
Content addressable memory (CAM)
Virtual circuits
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
- 4. Compare the Types of Switches Used in an
Enterprise Network
Hardware-based Layer 2 switching
Software-based Layer-3 (multilayer) switching
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
- 5. Compare the Types of Switches Used in an
Enterprise Network
Store and forward switching
Cut-through switching
Fast-forward
Fragment-free
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
- 6. Compare the Types of Switches Used in an
Enterprise Network
Switch physical security
Switch access security
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
- 7. Explain How Spanning Tree Protocol Prevents
Switching Loops
Redundancy in network equipment
Redundant network links
Dangers of switching loops
Broadcast storms
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
- 8. Explain How Spanning Tree Protocol Prevents
Switching Loops
Create a loop-free logical topology
Potential loop detection and port blocking
Redundancy without switching loops
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
- 9. Explain How Spanning Tree Protocol Prevents
Switching Loops
Determining a root bridge
Bridge ID (BID)
Root ports, designated ports, and blocked ports
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
- 10. Explain How Spanning Tree Protocol Prevents
Switching Loops
STP recalculations
Minimizing downtime
PortFast
UplinkFast
BackboneFast
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
- 11. Explain How Spanning Tree Protocol Prevents
Switching Loops
Spanning-tree verification commands
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
- 12. Explain How Spanning Tree Protocol Prevents
Switching Loops
Rapid Spanning Tree Protocol
Discarding
Active topology
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
- 13. Describe and Configure VLANs on a Cisco
Switch
Virtual LANs
Logical networks
Broadcast control
Transparent to end-users
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
- 14. Describe and Configure VLANs on a Cisco
Switch
VLAN functions
VLAN membership
Static
Dynamic
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
- 15. Describe and Configure VLANs on a Cisco
Switch
VLAN 1: management VLAN
VLAN numbers and names
Port assignment
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
- 16. Describe and Configure VLANs on a Cisco
Switch
VLAN verification commands
Deleting a VLAN
Removing a port from a VLAN
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
- 17. Describe and Configure VLANs on a Cisco
Switch
VLAN ID
Frame tagging: IEEE 802.1Q
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
- 18. Describe and Configure Trunking and Inter-
VLAN Routing
• Trunk port characteristics
Point-to-point link
Carry multiple-VLAN traffic over single link
• Support for frame tagging
• Trunk modes
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
- 19. Describe and Configure Trunking and Inter-
VLAN Routing
Extending VLANs across switches
Configuring a native VLAN
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
- 20. Describe and Configure Trunking and Inter-
VLAN Routing
Connectivity between different VLANs
Subinterfaces
Router-on-a-stick
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
- 21. Maintain VLAN Structure on an Enterprise
Network
VLAN Trunking Protocol (VTP) purpose and goals
Management domain
VTP modes: server, client, transparent
VLAN database
Configuration revision number
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
- 22. Maintain VLAN Structure on an Enterprise
Network
VTP messages
Summary advertisements
Subset advertisements
Advertisement requests
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
- 23. Maintain VLAN Structure on an Enterprise
Network
Configuring VTP
Verifying VTP configuration
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
- 24. Maintain VLAN Structure on an Enterprise
Network
VLANs and IP phones
VLANs and wireless security
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
- 25. Maintain VLAN Structure on an Enterprise
Network
VLAN best practices
VLAN security
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
- 26. Summary
Switches forward traffic using store and forward or cut-through
techniques
Basic security features should be applied to switches
A VLAN is a way to group hosts on the same logical network even
though they may be physically separated
Frame tagging allows a switch to identify the source VLAN of an
Ethernet frame.
A Layer 3 device is needed to move traffic between different
VLANs.
Subinterfaces allow router interfaces to support multiple VLANs.
VLAN Trunking Protocol provides centralized control, distribution
and maintenance of VLANs.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
- 27. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27