Will doing a clear arp on a cisco switch stop network traffic

Posted on 2011-10-27
Last Modified: 2012-05-12
Will clearing the arp table on a cisco switch halt network connectivity or operations or will it just clear the arp table and start to build it again.  Thanks.
Question by:denver218
    LVL 37

    Accepted Solution

    It will NOT affect traffic flow. The switch will just start learning again
    LVL 35

    Assisted Solution

    by:Ernie Beek
    I have noticed that sometimes it might interrupt/disconnect communications when clearing the entire arp cache (table), so be carefull with that.
    LVL 12

    Assisted Solution

    There will be slight slow down while the router learns everything again.
    LVL 3

    Assisted Solution

    The time it takes to re-learn the arp table is really short - shouldn't notice unless you're doing ping test, which supply the response times. If you're having issues with one entry, you can be specific in your clearing.
    LVL 21

    Assisted Solution

    Users may notice a 1 or 2 second slow down, but the network will not be "down," just re-learning.
    LVL 4

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