How to confgure Inter VLAN in Layer 3 Switch

How to confgure Inter VLAN in Layer 3 Switch(Example):

 

Step 1:  Configure trunk & access port on Layer 3 SW and Layer 2 SW

Layer 3 Switch (Syntax to configure trunk port in Layer 3 SW):

Switch#configure terminal

Switch(config)#interface range fastEthernet 0/1-2

Switch(config-if-range)#switchport trunk encapsulation dot1q

Switch(config-if-range)#switchport mode trunk

Layer 2 Switch (Trunk Port):

Switch#configure terminal

Switch(config)#interface fastEthernet 0/1

Switch(config-if)#switchport mode trunk

Configure Access port (Layer 3 or Layer 2 Switch):

Switch(config)#interface fastEthernet 0/2

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 2

Note: Same configure to other switch port.

Step 2: Configure Switch as Server, Client & Transparent  and create VLAN as your requirement

 

Old syntax of Configure VTP and VLAN:

Switch#vlan database

Switch(vlan)#vtp server/client/transparent

Switch(vlan)#vtp domain cisco

Switch(vlan)#vtp password cisco

Create Vlan:

Switch(vlan)#VLan 2 name vlan2
Switch(vlan)# exit   >> exit from vlan database config mode

 

New syntax of Configure VTP and VLAN::

Switch#enable

Switch#configure terminal

Switch(config)#vtp mode server/client/transparent >> as your requirement

Switch(config)#vtp domain cisco

Switch(config)#vtp password cisco

Note: Configure other switch by using same syntax

Switch#configure terminal

Switch(config)#vlan 2

Switch(config-vlan)#name vlan2

Note: Create VLAN as your requirement

Step 3: Configure Virtual interface in Layer 3 Switch as your requirement. Layer 3 Switch route network using virtual interface.

Switch#configure terminal

Switch(config)#interface vlan 2

Switch(config-if)#ip address 172.16.2.1 255.255.255.0

Switch(config-if)#no shutdown

Note: same configuration for your required VLAN

Step 4:  How to Assign IP address in Layer 3 Switch port

Switch#configure terminal  

Switch(config)#interface fastEthernet 0/24

Switch(config-if)#no switchport

Switch(config-if)#ip address 100.100.100.2 255.255.255.0

 Step 5: How to configure Layer 3 Switch as a router

Switch#configure terminal  

Switch(config)#ip routing     >> Enable IP routing

Switch#configure terminal  

Switch(config)#ip route 0.0.0.0 0.0.0.0 100.100.100.1  >> Configure default route

Note: you can also use any routing protocol in Layer 3 switch (RIP, EIGRP, OSPF etc).

 

Optional Step: Assign IP address in Switch (Layer 3 or Layer 2)

Switch#configure terminal  

Switch(config)#interface vlan 10

Switch(config-if)# ip address 192.168.1.2 255.255.255.0

Switch(config-if)#no shutdown

Switch(config-if)#exit

Switch(config)#ip default-gateway 192.168.1.1

Note: use for management purpose (Telnet, SSH etc….)

Configure all your PC as assigned network policy. Here I provide, just example. You configure your network as your requirement by flowing above step.


Example of Inter VLAN Configuration:

Deleting VLAN Database: By Default VLAN Database save in Flash memory as (vlan.dat). Is not store in running config...


Switch#show flash:  >> To show vlan Database
Switch(config)#no vlan 20  >> to Delete single VLAN from VLAN DB
Switch(config)#no vtp mode  >>  delete vtp mode  (If have)


Switch#write erase  OR Switch#erase startup-config  >> To erase Start-up Config then
Switch#delete flash:vlan.dat OR Switch#delete vlan.dat  >> to delete vlan.dat file
Switch#reload   >> reload or Power OFF then ON.