ExtremeSwitching (EXOS)

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exclude ip address from dhcp allocation range

  • 1.  exclude ip address from dhcp allocation range

    Posted 11-14-2014 14:20
    Is there a way to exclude a range/single ip address from "configure vlan dhcp-address-range xxxx - xxxx"
    for example: configure vlan vlan_name dhcp-address-range 10.1.1.20 - 10.1.1.254
    Can I exclude 10.1.1.60 from being allocated?



  • 2.  RE: exclude ip address from dhcp allocation range

    Posted 09-11-2015 04:36
    I have the same question


  • 3.  RE: exclude ip address from dhcp allocation range

    Posted 09-11-2015 07:22
    I didn't ever work with EXOS, but I guess you are able to configure static DHCP reservations? If so, just reserve 10.1.1.60 for MAC address aa:11:22:33:bb:cc.

    I admit it's a workaround but will prevent duplicate IPs.


  • 4.  RE: exclude ip address from dhcp allocation range

    Posted 09-11-2015 13:36
    Ionut,

    No, that's not possible. The DHCP server supports only a single continuous range of IP addresses.

    The DHCP server implementation was originally meant to provide temporary short-lived IP addresses for Web-based network login, where the final IP address would be provided by a central company-wide DHCP server when the port was moved to the final VLAN.


  • 5.  RE: exclude ip address from dhcp allocation range

    Posted 04-08-2021 09:09

    I have a similar case with one of our customers is asking to exclude a DHCP Ranges:

    Network Subnet: 10.0.0.0/20

    DHCP Ranges (Required):

        10.0.0.2 - 10.0.4.254
        10.0.6.1 - 10.0.9.254
        10.0.12.1 - 10.0.15.254

    DHCP Ranges (Exluded):

        10.0.5.1 - 10.0.5.254
        10.0.10.1 - 10.0.11.254


    They had sent me one of their Cisco DHCP configuration which they have already applied in their Lab:

    ip dhcp excluded-address 10.0.5.1 10.0.5.254
    ip dhcp excluded-address 10.0.10.1 10.0.11.254
    !
    ip dhcp pool 0
       network 10.0.0.0 255.255.240.0

    I wish that Extreme R&D Team that they can add this function especially in EXOS 30.0 or above ...