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63192 Views 1 Reply Latest reply: Jun 8, 2010 6:56 AM by Jared RSS

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Jun 8, 2010 5:06 AM

avi 73 posts since
Apr 25, 2010



How can we create a vlan on a router  ? Is there any particular configuration for that or it is the similar as we create it on a switch?





  • Jared 5,547 posts since
    Jul 27, 2008
    Currently Being Moderated
    1. Jun 8, 2010 6:56 AM (in response to avi)

    A vlan configuration on a router is slightly different than on a switch.  On a switch, you would create the vlan and then the routed vlan interface.


    On a router you tie a vlan to a subinterface.  You need to create the subinterface and then do the encapsulation dot1q <vlan ID> command.  This command basically assigned the vlan to the subinterface.  In this example, there are 2 vlans, vlan 100 and 201.  On the eth 0/0 interface, I created two subinterfaces.  fastethernet0/0.100 and f0/0.201.  Notice that I matched the subinterface number with the vlan ID.  You do not have to do this, but it is a best practice and really helps you as the administrator keep things organized.  So, under f0/0.100, there is the encapsulation dot1q 100, which basically binds vlan 100 to subinterface f0/0.100, then I assigned the IP.  The same is for the other subinterface.  So the router is trunking two vlans on its f0/0 interface, vlan's 100 and 201.


    interface FastEthernet0/0
    no ip address
    speed 100
    interface FastEthernet0/0.100
    description test Network
    encapsulation dot1Q 100
    ip address
    no snmp trap link-status
    interface FastEthernet0/0.201
    description  Office
    encapsulation dot1Q 201
    ip address
    no snmp trap link-status

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