ExtremeSwitching (EOS)

  • 1.  S4 DHCP Bindings

    Posted 06-19-2015 10:10
    Hi Guys,

    on a S4 Switch i have a dhcp pool enabled on a vlan. when i do "show ip dhcp binding" there are a lot of addresses with status "blocked" without any MACs associated. Does anybody know what that exactly means or when did this status appears?

    Thanks in advance
    Phil


  • 2.  RE: S4 DHCP Bindings

    Posted 06-19-2015 13:41
    Hello Phil,

    Please see the following GTAC Knowledge article I just published:

    https://gtacknowledge.extremenetworks.com/articles/Q_A/Why-does-S-N-K-Series-show-DHCP-Binding-state-blocked-for-Client-IP-Address/

    The router sends a ping to an IP address before offering an IP address to a client. If the IP address gets an ICMP response, we see there's someone already on the network with that IP address and mark it as "blocked" so we do not hand out duplicate addresses.

    Once you find the client that already has the IP address in the DHCP scope (possibly set statically), you should be able to clear up the blocked binding with command "clear ip dhcp binding [i]"

    Regards,
    Ryan Careno


  • 3.  RE: S4 DHCP Bindings

    Posted 06-22-2015 06:27
    Hi Ryan,

    great! Thank you very much

    Regards,
    Philipp


  • 4.  RE: S4 DHCP Bindings