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Configure Inter VLAN Routing on Cisco Router and Layer 3 Switches


  1. First of all create two VLAN in the switch and named VLAN A and VLAN B with the following command.

  1. OK, the VLANs A and B are created successfully. Now check them with “show vlan” command.

  1. You see the result on screenshot, the VLANs are ready for assigning switch ports to them.

ASSIGNING SWITCH PORTS FOR VLANS

  1. Try to assign switch ports for each VLANs with the following commands.
  1. Now the portFastEthernet 0/2 and FastEthernet 0/5 are members of VLAN 2 which named VLAN-A. Go to set the PC3 and PC2 to VLAN-B.
  2. Let’s assign a rang or ports to a VLAN using “interface range” command.
  1. Now we have just done the basic VLAN configuration like creating VLAN and assigning switch ports to VLANs. Let’s enable Trunking mode on switch port to router and then configure Inter VLAN routing on router.

CONFIGURE TRUNKING PORTS ON SWITCH

  1. Just navigate toFastEthernet 0/1 interface and type “switchport mode trunk“ the press enter to enable trunking on Fa0/1 interface line.
  1. Now the VLANs can transmit traffic over theFastethernet 0/1 without any problems.

CONFIGURE INTER VLAN ROUTING ON CISCO ROUTER

  1. Try to assign IP address to router and enable the interface you want to configure inter VLAN routing.
  1. Good, the IP192.168.10.1 with the subnet mask of 255.255.255.248 is assigned for physical Fastethernet 0/0 interface.
  1. Now try to create sub-interface for each VLAN withinterface command and assign IP address from different network for each VLAN. In this case I have sub-netted the192.168.10.0/24 IP address to 3 networks.
  1. See the result with “do show ip interface brief” from sub-interface area.
  1. Do the same to create a sub-interface for VLAN-B also.
  1. Everything is fine, but you see the error with red color! It is because we forgot to set theencapsulation dot1Q command. Before assigning IP address to a sub-interface, you should set IEEE 802.1q with encapsulation command.

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