I've been looking around in manuals and Cisco Books, but nowhere have I found how long an entry lives in the IPv6 Neighbour table. If that depends on the implementation, what is it for Cisco?

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    Aug 8, 2017 at 20:43

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For Cisco IOS the default cache timeout is "14,400 seconds (4 hours)".

  • Hi Ricky Beam, I'm seeing this for the first time since I didn't subscribed to the thread. Wouldn't 4 hours be the time for IPv6 arp table? I end up reading the Neighbour Discovery Protocol RFC and is seams to be really short, here's more information about it: tools.ietf.org/html/rfc4861#section-7.3.2
    – BlastDV
    Jul 7, 2014 at 20:29

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