Here's a situation, our network has a extreme blackdiamond box. And all the switches on the network are extreme switches. We also run vlans through the network.
recently we purchase a device which seems to die after a while on the network (yes on a vlan). You can't ping it after an hour and all network connectivity ends. Computers, printers and so on do not have this problem excet this device. And after much testing we determined that it's not the vlan but the device that was causing this.
We talked to the manufacture and they issued a XML configuration file to us to load on the device. I took a look at the XML file and all it does is tell the device to do a gratiutious arp every 2 mins. The manufacturer tells me that this arp will keep arp cached updated in the switch with the device Mac.
Now that the file has been loaded the device functions perfertly fine with no issues on the network.
I had a chance to talk to one of our network consultants about this and the tells me that none of the switches keep an arp table and that the manufacturer is lying and that it's something else. But ever since we did the upload the unit has been working fine with no issues.
So part of what he says make sense because when we were testing the unit, we have a continous ping going from a pc to the device and it still timed out eventually. But if what our consultants say is true then how do you explain the arp keeping the clock alive on the network?