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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