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  • vlan and trunk

    hi all

    i have some questions about configuring vlan.

    i have an existing environment. no vlan is set.

    can i configure vlan for a special purpose,
    while the main network still work without vlan config for it?
    then can i route between those two networks?

    also
    if i have i 2 switches with 2 vlan config on them
    can i use only one cable to connect those 2 swithces?
    or should i have a cable per vlan?
    (i am not intend to use a backbone config)

    my confusion is,
    in each switch there should be a trunk setting
    but those this setting, which is configure on the port
    should be also connected? using a cable?

    if so, then i am confused
    since, if i need to use a different cables,
    then it not so far from using a different segments

    thanks

  • #2
    Re: vlan and trunk

    Hmm i dont understand much of vlan, but i think you probably should give more details of your network, topology, what equipment you have...etc...etc...

    Regards
    Kevin

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    • #3
      Re: vlan and trunk

      If your equipment as you said support vlan you can use them without any problems.

      can i configure vlan for a special purpose,
      while the main network still work without vlan config for it?
      then can i route between those two networks?
      Yes you can, the only problem is each vlan as to be in a separate subnet. It means for example all the equipment in Vlan 10 as to be in the subnet 192.168.1.0/24 and the Vlan 20 in 192.168.2.0/24
      To route between this 2 vlans you need a router and to configure it as a "router on a stick" or your switch need to be a layer 3 switch.

      also
      if i have i 2 switches with 2 vlan config on them
      can i use only one cable to connect those 2 switches?
      or should i have a cable per vlan?
      (i am not intend to use a backbone config)
      Yes and that the reason you define a trunk port. The ports how join the 2 switches has to been configure as a trunk ports and the others one in access in the Vlan A or B as your needs.

      Good Luck

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      • #4
        Re: vlan and trunk

        since you are saying "trunk" and not "tagged vlans" i take it you have a cisco switch.

        actually vlans operating on the layer 2 (datalink) side of the osi model. each vlan could have the same network range, but as xavierds said. if you want the vlans to talk to eachother then you will need a router and the vlans will need different ip network ranges.

        since its a flat network with no vlan structure, by default, you are in vlan 1

        let us know if you need an example of how one looks...

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