I have a scenario I wanted to bounce of the group. I never really thought about this before, just wanted to confirm what Im thinking is correct. By default I think a Cisco router maintains an ARP entry for 2 hours, at which time if its not been used it ages out. In a Cisco switch however cam entries age out in a much shorter rate, I think 10 minutes. On that note can't you get unicast flooding as a result of this?? Because the cam entry for a device has disappeared and the directly attached router still has an Arp entry?? Wont packets destine for that device from another Vlan still be sent to that network and get unicast flooded??? (A switch floods a packet when it doesnt not have a cam entry for it, if the device is shut off the cam isnt going to come back) This could be fixed by a clear Arp but unless I'm missing something it seems what I stated above would happen, and could happen regularly for up to a 2 hour period ??
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