Roberto Salazar Tue, 02/03/2009 - 09:24
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Nope there is no way to clear a single ip, I don;t think you can clear a single ip on any platform:

c6509-E#clear arp


% Invalid input detected at '^' marker.

c6509-E#clear arp ?

Giuseppe Larosa Tue, 02/03/2009 - 10:57
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I see on C6500 with Supt 720 3B that is possible to clear the entries associated with a single L3 interface:

clear arp interface Vlan ?

<1-4094> Vlan interface number

Hope to help


ullasupendran Tue, 02/03/2009 - 11:04
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Hi guiseppe

Unfortunatly mine is sup II (c6sup2_rp Software (c6sup2_rp-JK2SV-M), Version 12.1(22)E2 ).

I could nt find that command in the switch.

6513-A#clear arp ?


Elly Bornstein Tue, 02/03/2009 - 11:36
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No there is not a way, but just FYI.

Clearing ARP cache is not really 'clearing' it.

when you clear ARP cache you are sending a bunch of unicast ARP requests to every host in your ARP table, if they reply we refresh the ARP entry. If no reply then we clear out the ARP entry.

If you want to just refresh an ARP entry for a particular host, just ping it.

ullasupendran Tue, 02/03/2009 - 11:40
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Does that mean if i do a clear arp-cache , will it affect any existing connections?


Eli Barb Wed, 05/09/2012 - 13:55
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'clear ip arp A.B.C.D' where A.B.C.D is the IP address.

John Blakley Wed, 05/09/2012 - 14:30
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I have a Sup2 and I can only clear arp completely or by interface

Eli Barb Thu, 05/10/2012 - 07:07
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What version of IOS are you running on the Sup2? I ran this on newer Sup720-10G and Sup720-3B modules running newer SXJ code and on a Sup720-3B running older SXF. Not sure without combing through release notes whether it's hardware or IOS version dependent.


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