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![· Basic Configuration of VLAN
• Step 1: Enter the port to be configured
swtich(config)#interface interface
• Step 2: Set the mode of the port to Trunk
Switch(config-if)#switchport mode trunk
switch(config)#interface range GigabitEthernet 0/2-4
switch(config-if-range)#switchport mode trunk
switch(config-if-range)#exit
switch(config)#interface GigabitEthernet 0/2
switch(config-if-GigabitEthernet 0/2)#switchport trunk allowed vlan remove 1-4094
switch(config-if-GigabitEthernet 0/2)#switchport trunk allowed vlan add 10,20
• Step 3: Modify the port default VLAN, the default is VLAN 1
Switch(config-if)#switchport trunk native vlan vlan-id
• Step 4: Define a list of VLAN control behaviors for Trunk links (VLAN pruning, etc.) (optional, and use with caution)
Switch(config-if)#switchport trunk allowed vlan { all | [ add | remove | except | only ] } vlan-list](https://image.slidesharecdn.com/9-240529020417-6e7bba43-240529030129-4ec8f3ec-240603055308-6a3ab28a/85/2024-2024-2024-ac123-net-17-320.jpg)
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- 3. 0000.0000.0001 F0/1 0000.0000.0002 F0/1 0000.0000.0003F0/3 0000.0000.0004 F0/2
- 4. · Foreword Ethernet isa communication technology that features a shared communication medium. When the number of hosts is too large, problems such as can occur, which can lead to degraded network communication performance. The VLAN technology can solve the above problems. This section will introduce the concepts related to VLANs as well as the data forwarding principles and related configurations of VLANs.
- 5. · Broadcast Storm Inthe following scenarios, the company's internal network is as the number of hosts increases. • Layer 2 switches form a • Switch packets from all interfaces • Broadcast data floods in the broadcast domain, consuming network bandwidth, degrading equipment performance and leading to security risks Layer 2 Switches Layer 2 Switches Layer 2 Switches Technology Finance Technology Broadcast Frame Technology Finance Finance
- 6. · Router IsolationBroadcast Domain The can isolate the broadcast domain and reduce the range of the broadcast domain. Layer 2 Switches Layer 2 Switches Router Technology Finance Technology Technology Finance Finance Broadcast Frame
- 7. · VLAN Scenario Thereare offices for the technical and financial departments on the fifth and sixth floors of the company building. The customer requires that departments can communicate with each other, but different departments are isolated from each other. By using the way of dividing VLAN to achieve and can be with effective Technology Department Finance Department
- 8. · VLAN Standard Switchesuse to distinguish between Ethernet frames of different VLANs
- 9. · 802.1Q StandardEncapsulation • Fixed value , indicating that the frame contains 802.1Q tag information. • , indicating VID, available range 1-4094, used to uniquely identify a VLAN. • , indicating the priority level, used for QoS. • Canonical format indicator: 1 bit, indicating bus-type Ethernet, FDDI, token ring network. TPID 0x8100 Priority 0-7 CFI 0/1 VID 0-4095
- 10. · Single-Switch VLANTag Operation Adding default VLAN tag when entering switch port. Untagging VLANs when leaving a switch port.
- 11. · Access Port Allowto pass and receive and send data frames for only one VLAN. Generally used to connect
- 12. · Cross-switch VLANTag Operations Support for Ethernet frames carrying VLAN tags to be passed between switches. ? Vlan 10 Vlan 20 Vlan 20 Vlan 10 Gi0/1 G0/2 Gi0/1 G0/2 G0/24 G0/24
- 13. · Trunk Port Allowsto pass through, and can receive and send data frames for multiple VLANs. Ethernet frames without tags for the default VLAN. Generally used to connect between Vlan 10 Vlan 20 Vlan 20 Vlan 10 Gi0/1 G0/2 Gi0/1 G0/2 G0/24 G0/24
- 14. · Configuration Stepsfor VLAN • Creating the corresponding VLAN on each switch. • Dividing the corresponding hosts into VLANs based on their interfaces. • Interconnected interfaces of the switch configure Trunk interfaces. Vlan 10 Vlan 20 Technology Finance
- 15. · Basic Configurationof VLAN • Step 1: Create VLAN Switch(config)#vlan vlan-id • Step 2: Name VLAN Switch(config-vlan)#name vlan-name switch(config)#vlan 10 // Create VLAN switch(config-vlan)# name IT //Naming of VLANs for easy O&M switch(config)#vlan 20 switch(config-vlan)# name finance
- 16. · Basic Configurationof VLAN • Step 1: Enter the port configuration mode Swtich(config)#interface interface • Step 2: Set the port mode to access port Switch(config-if)#switchport mode access switch(config)#interface range f0/1-2 switch(config-if-range)#switchport access vlan 10 //Interface is partitioned to VLAN 10 switch(config)#interface f0/3 switch(config-if)#switchport access vlan 20 • Step 3: Add the port to a specific VLAN Switch(config-if)#switchport access vlan vlan-id
- 17. · Basic Configurationof VLAN • Step 1: Enter the port to be configured swtich(config)#interface interface • Step 2: Set the mode of the port to Trunk Switch(config-if)#switchport mode trunk switch(config)#interface range GigabitEthernet 0/2-4 switch(config-if-range)#switchport mode trunk switch(config-if-range)#exit switch(config)#interface GigabitEthernet 0/2 switch(config-if-GigabitEthernet 0/2)#switchport trunk allowed vlan remove 1-4094 switch(config-if-GigabitEthernet 0/2)#switchport trunk allowed vlan add 10,20 • Step 3: Modify the port default VLAN, the default is VLAN 1 Switch(config-if)#switchport trunk native vlan vlan-id • Step 4: Define a list of VLAN control behaviors for Trunk links (VLAN pruning, etc.) (optional, and use with caution) Switch(config-if)#switchport trunk allowed vlan { all | [ add | remove | except | only ] } vlan-list
- 18. · Basic Configurationof VLAN • Delete VLAN Switch(config)#no vlan VLAN-id • View configuration information Switch# show vlan Ruijie#show vlan VLAN Name Status Ports ---- -------------------------------- --------- ---------------------------- 1 VLAN0001 STATIC Fa0/4, Fa0/5, Fa0/6, Fa0/7 Fa0/8, Fa0/9, Fa0/10, Fa0/11 Fa0/12, Fa0/13, Fa0/14, Fa0/15 Fa0/16, Fa0/17, Fa0/18, Fa0/19 Fa0/20, Fa0/21, Fa0/22, Fa0/23 Fa0/24, Gi0/25, Gi0/26 10 VLAN0010 STATIC Fa0/1, Fa0/2 20 VLAN0020 STATIC Fa0/3
- 19. · VLAN ConfigurationExample Ruijie-SW(config)#vlan 10 Ruijie-SW(config-vlan)#add interface gigabitEthernet 0/1 Ruijie-SW(config-vlan)#exit Ruijie-SW(config)#vlan 20 Ruijie-SW(config-vlan)#add interface gigabitEthernet 0/2 Ruijie-SW(config-vlan)#exit Ruijie-SW1(config)#interface gigabitEthernet 0/24 Ruijie-SW2(config-if-GigabitEthernet 0/0)#switchport mode trunk Ruijie-SW2(config-if-GigabitEthernet 0/0)#switchport trunk allowed vlan only 10,20 Vlan 10 Vlan 20 Vlan 20 Vlan 10 Gi0/1 G0/2 Gi0/1 G0/2 G0/24 G0/24 Ruijie-SW(config)#vlan 10 Ruijie-SW(config-vlan)#add interface gigabitEthernet 0/1 Ruijie-SW(config-vlan)#exit Ruijie-SW(config)#vlan 20 Ruijie-SW(config-vlan)#add interface gigabitEthernet 0/2 Ruijie-SW(config-vlan)#exit Ruijie-SW1(config)#interface gigabitEthernet 0/24 Ruijie-SW2(config-if-GigabitEthernet 0/0)#switchport mode trunk Ruijie-SW2(config-if-GigabitEthernet 0/0)#switchport trunk allowed vlan only 10,20
- 20. Logical-based grouping, whichcan be grouped according to services or functions More flexible networking regardless of physical location Reduces the management costs associated with node movement in the network Users in different VLANs need to use Layer 3 devices to communicate
- 21. PC1 and PC4 PC2and PC5 PC3 and PC5 PC1 and PC5