I have gratuitous ARP turned off for this reason. I have seen this happen before when a DHCP scope is getting 70% full or more (with microsoft DHCP starting from 2008 r2 and newer)..
*--Jeremy L. Gibbs* Sr. Network Engineer Utica College IITS On Thu, Sep 1, 2016 at 2:11 PM, Tufts, Mark <[email protected]> wrote: > Hi, > > > > Since the students came back we have has high CPU utilization come and go > on our core routers. After much time looking at traffic patterns we have > seen this traffic coming only from our Aruba IAP VC buildings. We have > other building have Juniper wireless with a central controller. The reason > for the high CPU appears to be two wireless devices getting the same IP > address. Once this happens gratuitous arps flood the uplinks and crush our > CPUs > > > > The leases in our DHCP server mark them as bad. We are using Microsoft > DHCP. > > > > Has anyone experienced anything like this? > > > > Thanks, > > > > Mark > > > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at http://www.educause.edu/ > groups/. > > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
