CCNA 3 v 3 1 Module 8 1

CCNA 3 v 3. 1 Module 8 1

CCNA 3 Module 8 Virtual LANS (VLANS) 2

Objectives of Module 8 • VLAN concepts • VLAN configuration • Troubleshooting VLANs 3

Introduction to VLANs 4

VLANs logically segment switched networks based on an organization's functions, project teams, or applications as opposed to a physical or geographical basis. 5

Broadcast Domains 6

3 Broadcast Domains, 3 VLANs 7

Static VLANs 8

Dynamic VLANs 9

Port-Centric VLANs 10

VLAN Configuration 11

Benefits of VLANs • Easily move workstations on the LAN • Easily add workstations to the LAN • Easily change the LAN configuration • Easily control network traffic • Improve security 12

Communicating Between VLANs 13

VLAN Types 14

Inter-Switch Link 15

Concurrent Transmissions in a Switch 16

End-to-End VLANs 17

Static VLANs • Static VLANs work well in networks where the following is true: Moves are controlled and managed. There is robust VLAN management software to configure the ports. It is not desirable to assume the additional overhead required when maintaining endstation MAC addresses and custom filtering tables. 18

Verifying VLAN’s 19

Saving VLAN Configuration Back up using the copy running-config tftp command, or you can use the Hyper. Terminal Capture Text feature to store the configuration settings. 20

Deleting VLANs 21

VLAN Problem Isolation 22

Problem Isolation in Catalyst Networks 23

Preventing Broadcast Storms 24

Common Problems in Troubleshooting VLANs 25

show vlan Command 26

Catalyst IOS Keyword Syntax Description 27

show spanning-tree Command 28

VLAN Troubleshooting Scenarios A trunk link cannot be established between a switch and a router 29

VLAN Troubleshooting Scenarios VTP is not properly propagating VLAN configuration changes. 30

VLAN Troubleshooting Scenarios Dropped packets and loops 31