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New Member

Clearing single arp entry in 6500 switch

Is there any way to clear a single ARP cache entry on the 6500 switch ?

Thanks in advance

Ullas

8 REPLIES

Re: Clearing single arp entry in 6500 switch

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 1.1.1.1

^

% Invalid input detected at '^' marker.

c6509-E#clear arp ?

Hall of Fame Super Silver

Re: Clearing single arp entry in 6500 switch

Hello,

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

Giuseppe

New Member

Re: Clearing single arp entry in 6500 switch

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 ?

Ullas

Cisco Employee

Re: Clearing single arp entry in 6500 switch

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.

New Member

Re: Clearing single arp entry in 6500 switch

Does that mean if i do a clear arp-cache , will it affect any existing connections?

Ullas

New Member

Clearing single arp entry in 6500 switch

'clear ip arp A.B.C.D' where A.B.C.D is the IP address.

Re: Clearing single arp entry in 6500 switch

I have a Sup2 and I can only clear arp completely or by interface

HTH, John *** Please rate all useful posts ***
New Member

Re: Clearing single arp entry in 6500 switch

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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