際際滷

際際滷Share a Scribd company logo

Virtual LAN

Download as PPTX, PDF
Lilesh Pathe
Lilesh Pathe

1. An introduction of LAN. 2. An introduction of VLAN. 3. Properties of VLAN. 4. Types of VLAN. 5. VLAN Identification Method 6. VLAN Trunking Protocol. 7. Inter-VLAN routing.

1 of 17
Downloaded 124 times
Lilesh Pathe Virtual LAN
CONTENTS Introduction of LAN Introduction of VLAN Properties of VLAN Types of VLAN VLAN Identification methods VLAN Trunking protocol Inter-Vlan Routing
LAN A Local Area Network (LAN) was originally defined as a network of computers located within the same area. Local Area Networks are defined as a single broadcast domain. This means that if a user broadcasts information on his/her LAN, the broadcast will be received by every other user on the LAN.
VLAN A VLAN is a logical group of network devices that appears to be on the same LAN. Configured as if they are attached to the same physical connection even if they are located on a number of different LAN segments. Logically segment LAN into different broadcast domains. VLANs can logically segment users into different subnets (Broadcast Domains) Broadcast frames are only switched on the same VLAN ID. This is a logical segmentation and not a physical one, workstations do not have to be physically located together. Users on different floors of the same building, or even in different buildings can now belong to the same LAN.
VLAN Range By Default 5 VLANs created on a Switch, But only VLAN 1 belongs to Ethernet network out of these 5 VLANs. VLANs Usage 0 For System use only, You cannot see or use these VLAN. 1 Cisco default, We can use this VLAN but cannot delete it. 2-1001 Use for Ethernet VLANs, We can create, use and delete these VLANs 1002-1005 Cisco Default for FDDI and Token Ring. We can not delete these VLANs.
Properties of VLAN Allows us to split switches into separate (virtual) switches. To Reduce the cost of network. Inter-VLAN traffic must be routed (i.e. go through a router) because they are separate subnets VLANs provide segmentation based on broadcast domains. VLANs logically segment switched networks based on the functions, project teams, or applications of the organization regardless of the physical location or connections to the network. All workstations and servers used by a particular workgroup share the same VLAN, regardless of the physical connection or location.
VLANs address scalability, security, and network management. Routers in VLAN topologies provide broadcast filtering, security, and traffic flow management. The switch behaves as several virtual switches, sending traffic only within VLAN members.
Types of VLAN A VLAN can be classified into two types: Static Vlan Dynamic Vlan Static VLAN Static Vlan are also referred to as port-based VLANs. In static VLAN switch-ports must be manually assigned to a VLAN. Any device connecting to that switch-port(s) becomes a member of that VLAN. The client device is unaware that it belongs to a specific VLAN. Static VLAN is easy to configure.
Dynamic VLAN In dynamic VLAN devices are automatically assigned into a VLAN based on its MAC address. This allows a client device to remain in the same VLAN, regardless of which switch port the device is attached to. VLAN membership of a user always remains the same even when he/she is moved to another location.
Types Of Port In VLAN Access Ports: A port of switch which can carries the traffic of only one VLAN which it belong to is known as Access Port. Voice Access Ports: : Ports which can carry the voice data of other VLAN is known as Voice Access Ports. Trunk Ports: : A port which can carry the data of different VLAN.
Broadcast Domains With VLANs And Routers Without VLANs Without VLANs, each group is on a different IP network and on a different switch.
With VLANs Using VLANs. Switch is configured with the ports on the appropriate VLAN. Still, each group on a different IP network; however, they are all on the same switch. Sales
VLAN Identification Methods Frame Tagging: VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link. There are two method of frame tagging which are given below. Inter Switch Link: ISL is a cisco proprietary VLAN identification protocol used on fast Ethernet ports. It can only use to trunk between cisco devices. ISL actually re-encapsulate the entire original frame with a new header and new CRC value. IEEE 802.1q: It is an industry standard method of Vlan identification. This protocol doesnt entirely re-encapsulate a frame but instead of this it adds VLAN identification information into frames.
VLAN Trunking protocol (VTP) VLAN Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol.
VTP Server: In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. VTP Client: VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. VTP Transparent: VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements, but transparent switches do forward VTP advertisements that they receive out their trunk ports in VTP. Modes Of VTP
Inter-Vlan Routing Inter-Vlan routing allows the communication of two different VLAN on a switch. To accomplish this we need a router or a layer 3 switch. To support ISL and IEEE 802.1Q routing on a fast Ethernet interface the router interface is divide into logical interface one for each Vlan, these are called sub interface.
THANKYOU

More Related Content

Virtual LAN

  • 2. CONTENTS Introduction of LAN Introduction of VLAN Properties of VLAN Types of VLAN VLAN Identification methods VLAN Trunking protocol Inter-Vlan Routing
  • 3. LAN A Local Area Network (LAN) was originally defined as a network of computers located within the same area. Local Area Networks are defined as a single broadcast domain. This means that if a user broadcasts information on his/her LAN, the broadcast will be received by every other user on the LAN.
  • 4. VLAN A VLAN is a logical group of network devices that appears to be on the same LAN. Configured as if they are attached to the same physical connection even if they are located on a number of different LAN segments. Logically segment LAN into different broadcast domains. VLANs can logically segment users into different subnets (Broadcast Domains) Broadcast frames are only switched on the same VLAN ID. This is a logical segmentation and not a physical one, workstations do not have to be physically located together. Users on different floors of the same building, or even in different buildings can now belong to the same LAN.
  • 5. VLAN Range By Default 5 VLANs created on a Switch, But only VLAN 1 belongs to Ethernet network out of these 5 VLANs. VLANs Usage 0 For System use only, You cannot see or use these VLAN. 1 Cisco default, We can use this VLAN but cannot delete it. 2-1001 Use for Ethernet VLANs, We can create, use and delete these VLANs 1002-1005 Cisco Default for FDDI and Token Ring. We can not delete these VLANs.
  • 6. Properties of VLAN Allows us to split switches into separate (virtual) switches. To Reduce the cost of network. Inter-VLAN traffic must be routed (i.e. go through a router) because they are separate subnets VLANs provide segmentation based on broadcast domains. VLANs logically segment switched networks based on the functions, project teams, or applications of the organization regardless of the physical location or connections to the network. All workstations and servers used by a particular workgroup share the same VLAN, regardless of the physical connection or location.
  • 7. VLANs address scalability, security, and network management. Routers in VLAN topologies provide broadcast filtering, security, and traffic flow management. The switch behaves as several virtual switches, sending traffic only within VLAN members.
  • 8. Types of VLAN A VLAN can be classified into two types: Static Vlan Dynamic Vlan Static VLAN Static Vlan are also referred to as port-based VLANs. In static VLAN switch-ports must be manually assigned to a VLAN. Any device connecting to that switch-port(s) becomes a member of that VLAN. The client device is unaware that it belongs to a specific VLAN. Static VLAN is easy to configure.
  • 9. Dynamic VLAN In dynamic VLAN devices are automatically assigned into a VLAN based on its MAC address. This allows a client device to remain in the same VLAN, regardless of which switch port the device is attached to. VLAN membership of a user always remains the same even when he/she is moved to another location.
  • 10. Types Of Port In VLAN Access Ports: A port of switch which can carries the traffic of only one VLAN which it belong to is known as Access Port. Voice Access Ports: : Ports which can carry the voice data of other VLAN is known as Voice Access Ports. Trunk Ports: : A port which can carry the data of different VLAN.
  • 11. Broadcast Domains With VLANs And Routers Without VLANs Without VLANs, each group is on a different IP network and on a different switch.
  • 12. With VLANs Using VLANs. Switch is configured with the ports on the appropriate VLAN. Still, each group on a different IP network; however, they are all on the same switch. Sales
  • 13. VLAN Identification Methods Frame Tagging: VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link. There are two method of frame tagging which are given below. Inter Switch Link: ISL is a cisco proprietary VLAN identification protocol used on fast Ethernet ports. It can only use to trunk between cisco devices. ISL actually re-encapsulate the entire original frame with a new header and new CRC value. IEEE 802.1q: It is an industry standard method of Vlan identification. This protocol doesnt entirely re-encapsulate a frame but instead of this it adds VLAN identification information into frames.
  • 14. VLAN Trunking protocol (VTP) VLAN Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol.
  • 15. VTP Server: In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. VTP Client: VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. VTP Transparent: VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements, but transparent switches do forward VTP advertisements that they receive out their trunk ports in VTP. Modes Of VTP
  • 16. Inter-Vlan Routing Inter-Vlan routing allows the communication of two different VLAN on a switch. To accomplish this we need a router or a layer 3 switch. To support ISL and IEEE 802.1Q routing on a fast Ethernet interface the router interface is divide into logical interface one for each Vlan, these are called sub interface.