ExtremeSwitching (EXOS)

  • 1.  IP address conflict detection on Extreme Layer 2 switches

    Posted 06-12-2014 14:04
    Is there any logging feature on Extreme devices (switches or routers) that can detect IP address conflicts (in this case, on windows machines)?


  • 2.  RE: IP address conflict detection on Extreme Layer 2 switches

    Posted 06-12-2014 16:04
    Hey Jimmy

    The switch will detect a duplicate IP address by default and warn you if a station is set to the same IP Address of a VLAN. Using DHCP snooping helps this as it does not allow any static IP addresses on the network.

    Also look at Duplicate Address Detection (DAD) in the concepts guide. It is on page 1255 of the 15.4 guide.

    Hope that helps
    P


  • 3.  RE: IP address conflict detection on Extreme Layer 2 switches

    Posted 06-13-2014 02:11
    IP DAD is a good feature.

    We can also use UPM script to avoid duplicate ip in network.
    It is quite common scenario to have protection for VRRP gateway to avoid network outage.

    These commands are to be applied on edge switch .Core switch has VRRP.

    configure log filter DupIP add events FDB.arpViolation create log target upm Disable_DupIP_Port
    enable log target upm Disable_DupIP_Port
    configure log target upm Disable_DupIP_Port filter DupIP severity Warning

    enable ip-security arp gratuitous-protection vlan


  • 4.  RE: IP address conflict detection on Extreme Layer 2 switches

    Posted 01-09-2015 08:25
    To fix ip address conflict, contact your ISP . After that, you can check your ip by using Ip-details.com