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  • Two DHCP Servers

    Two DHCP Servers

    I know this but I need to be 100% sure about DHCP servers.
    If two windows Dhcp servers allocating two different network addresses. What would happen if someone connect a straight through cable between two switches one for each DHCP server.
    The DHCP lease is set for 8 days on each server.
    1) Would it take one of the whole network down.
    2)Would it allocate address from different dhcp range.

  • #2
    Re: Two DHCP Servers

    Your question isn't really clear but I'm assuming you mean:

    "If I have two DHCP servers connected to two different switches and I connect those switches together what will happen?".

    The answer is: Some DHCP clients will get ip addresses from one DHCP server and some DHCP clients will get ip addresses from the other DHCP server. There's nothing inherently wrong with having two DHCP servers on the same network except when the ip address ranges configured for both DHCP servers are the same. It's quite common in Windows networks to have more than one DHCP server set up in some type of split scope configuration to provide fault tolerance in case one DHCP server fails.

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    • #3
      Re: Two DHCP Servers

      Originally posted by joeqwerty View Post
      Your question isn't really clear but I'm assuming you mean:

      "If I have two DHCP servers connected to two different switches and I connect those switches together what will happen?".

      The answer is: Some DHCP clients will get ip addresses from one DHCP server and some DHCP clients will get ip addresses from the other DHCP server. There's nothing inherently wrong with having two DHCP servers on the same network except when the ip address ranges configured for both DHCP servers are the same. It's quite common in Windows networks to have more than one DHCP server set up in some type of split scope configuration to provide fault tolerance in case one DHCP server fails.
      Thanks.
      Would it cause any disruption or no connectivity for other switches as I think it would create a loop.

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      • #4
        Re: Two DHCP Servers

        Two switches connected with a single link will not create a loop. Two switches connected with two links would create a loop.

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        • #5
          Re: Two DHCP Servers

          Originally posted by joeqwerty View Post
          Two switches connected with a single link will not create a loop. Two switches connected with two links would create a loop.
          Let me understand this if one cable with two ends connected into two different network switches would not create an outage or loop. two cables connected into two different network switches would this create a loop or outage.

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          • #6
            Re: Two DHCP Servers

            No Loop =

            A<----->B

            Loop =

            A<----->B
            A<----->B

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            • #7
              Re: Two DHCP Servers

              Originally posted by joeqwerty View Post
              No Loop =

              A<----->B

              Loop =

              A<----->B
              A<----->B
              Thanks for that joeqwerty.

              Am I right to say connecting single cable into two different subnets switch would not cause a loop and an outage. I am just investigating something.

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              • #8
                Re: Two DHCP Servers

                Yes, connecting one cable to two switches should not create a loop or cause an outage.

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