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Sybex CCNA 640-802
Chapter 9: VLAN’s
Instructor & Todd Lammle
Chapter 9 Objectives
The CCNA Topics Covered in this chapter
include:
• What is a VLAN?
• VLAN Memberships
• VLAN links
• Frame tagging
• VTP
• Trunking
• Configuring VLANs
• Inter-VLAN Communication
• Configuration examples
2
Virtual LANs (VLANs)
• Definition: A logical grouping of
network users and resources
connected to administratively defined
ports on a switch.
– Smaller broadcast domains
– Organized by:
• Location
• Function
• Department
• Application or protocol
Switches
Features of VLANs
• Simplify network management
• Provides a level of security over
a flat network
• Flexibility and Scalability
Broadcast Control
• Broadcasts occur in every
protocol
• Bandwidth & Broadcasts
• Flat network
• VLANs & Broadcasts
Flat Network Structure
Security
• Flat network problems
• VLANs
Flexibility & Scalability
• Layer-2 switches only read frames
– Can cause a switch to forward all
broadcasts
• VLANs
– Essentially create broadcast
domains
• Greatly reduces broadcast traffic
• Ability to add wanted users to a VLAN
regardless of their physical location
• Additional VLANs can be created when
network growth consumes more
bandwidth
Switched Network
Physical LANs Connected To
A Router
VLANs Remove The Physical
Boundary
VLAN Memberships
• Static VLANs
– Typical method of creating VLANs
– Most secure
• A switch port assigned to a VLAN always
maintains that assignment until changed
• Dynamic VLANs
– Node assignment to a VLAN is automatic
• MAC addresses, protocols, network addresses,
etc
– VLAN Management Policy Server (VMPS)
• MAC address database for dynamic
assignments
• MAC-address to VLAN mapping
Identifying VLANs
• Access links
– A link that is part of only one VLAN
• Trunk links
– Carries multiple VLANs
Identifying VLANs (cont.)
Frame Tagging
• Definition: A means of keeping
track of users & frames as they
travel the switch fabric & VLANs
– User-defined ID assigned to each
frame
– VLAN ID is removed before
exiting trunked links & access
links
VLAN ID Methods
• Inter-Switch Link (ISL)
– Cisco proprietary
– FastEthernet & Gibabit Ethernet
only
• IEEE 802.1q
– Must use if trunking between Cisco
& non-Cisco switch
Inter-Switch Link (ISL)
Protocol
• Definition: A means of explicitly
tagging VLAN information onto
an Ethernet frame
– Allows VLANs to be multiplexed
over a trunk line
– Cisco proprietary
– External tagging process
VLAN Trunk Protocol (VTP)
• Purpose: to manage all
configured VLANs across a
switch internetwork & maintain
consistency
– Allows an administrator to add,
delete, & rename VLANs
VTP Benefits
• Benefits
– Consistent configuration
– Permits trunking over mixed
networks
– Accurate tracking
– Dynamic reporting
– Plug-and-Play
• A VTP server must be created to
manage VLANs
VTP Modes
VTP Modes of Operation
• Server
– Default for all Catalyst switches
– Minimum one server for a VTP domain
• Client
– Receives information + sends/receives
updates
– Cannot make any changes
• Transparent
– Does not participate in a VTP domain
but forwards VTP advertisements
– Can add/delete VLANs
– Locally significant
Router with Individual VLAN
associations
Routing Between VLANs
Configuring VLANs
• Creating VLANs
• Assigning Switch Ports to
VLANs
• Configuring Trunk Ports
• Configuring Inter-VLAN
routing
Configuring VTP
• Switches are configured to be
VTP servers by default.
InterVLAN Configuration
Example
Example 2
Example 3
Example 4
Configuring Switching In Our
Sample Internetwork
2950C
2950B
Setting Up Trunking
Inter-VLAN communication
Written Labs and Review
Questions
– Open your books and go through all the
written labs and the review questions.
– Review the answers in class.
36

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CCNA Presentation

  • 1. Sybex CCNA 640-802 Chapter 9: VLAN’s Instructor & Todd Lammle
  • 2. Chapter 9 Objectives The CCNA Topics Covered in this chapter include: • What is a VLAN? • VLAN Memberships • VLAN links • Frame tagging • VTP • Trunking • Configuring VLANs • Inter-VLAN Communication • Configuration examples 2
  • 3. Virtual LANs (VLANs) • Definition: A logical grouping of network users and resources connected to administratively defined ports on a switch. – Smaller broadcast domains – Organized by: • Location • Function • Department • Application or protocol
  • 5. Features of VLANs • Simplify network management • Provides a level of security over a flat network • Flexibility and Scalability
  • 6. Broadcast Control • Broadcasts occur in every protocol • Bandwidth & Broadcasts • Flat network • VLANs & Broadcasts
  • 8. Security • Flat network problems • VLANs
  • 9. Flexibility & Scalability • Layer-2 switches only read frames – Can cause a switch to forward all broadcasts • VLANs – Essentially create broadcast domains • Greatly reduces broadcast traffic • Ability to add wanted users to a VLAN regardless of their physical location • Additional VLANs can be created when network growth consumes more bandwidth
  • 11. Physical LANs Connected To A Router
  • 12. VLANs Remove The Physical Boundary
  • 13. VLAN Memberships • Static VLANs – Typical method of creating VLANs – Most secure • A switch port assigned to a VLAN always maintains that assignment until changed • Dynamic VLANs – Node assignment to a VLAN is automatic • MAC addresses, protocols, network addresses, etc – VLAN Management Policy Server (VMPS) • MAC address database for dynamic assignments • MAC-address to VLAN mapping
  • 14. Identifying VLANs • Access links – A link that is part of only one VLAN • Trunk links – Carries multiple VLANs
  • 16. Frame Tagging • Definition: A means of keeping track of users & frames as they travel the switch fabric & VLANs – User-defined ID assigned to each frame – VLAN ID is removed before exiting trunked links & access links
  • 17. VLAN ID Methods • Inter-Switch Link (ISL) – Cisco proprietary – FastEthernet & Gibabit Ethernet only • IEEE 802.1q – Must use if trunking between Cisco & non-Cisco switch
  • 18. Inter-Switch Link (ISL) Protocol • Definition: A means of explicitly tagging VLAN information onto an Ethernet frame – Allows VLANs to be multiplexed over a trunk line – Cisco proprietary – External tagging process
  • 19. VLAN Trunk Protocol (VTP) • Purpose: to manage all configured VLANs across a switch internetwork & maintain consistency – Allows an administrator to add, delete, & rename VLANs
  • 20. VTP Benefits • Benefits – Consistent configuration – Permits trunking over mixed networks – Accurate tracking – Dynamic reporting – Plug-and-Play • A VTP server must be created to manage VLANs
  • 22. VTP Modes of Operation • Server – Default for all Catalyst switches – Minimum one server for a VTP domain • Client – Receives information + sends/receives updates – Cannot make any changes • Transparent – Does not participate in a VTP domain but forwards VTP advertisements – Can add/delete VLANs – Locally significant
  • 23. Router with Individual VLAN associations
  • 25. Configuring VLANs • Creating VLANs • Assigning Switch Ports to VLANs • Configuring Trunk Ports • Configuring Inter-VLAN routing
  • 26. Configuring VTP • Switches are configured to be VTP servers by default.
  • 31. Configuring Switching In Our Sample Internetwork
  • 32. 2950C
  • 33. 2950B
  • 36. Written Labs and Review Questions – Open your books and go through all the written labs and the review questions. – Review the answers in class. 36