Clearing arp-cache

Unanswered Question
Aug 30th, 2011

Hi,

is there a way to clear one arp-cache entry in the 6509s. I have a mac that has two IPs associated with it. I could clear the arp-cache of the whole vlan? Would this disrupt any users on this vlan? Also, any explanation of why this would happen? The user was recently moved from vlan 2 to 29. Thanks

Internet  170.117.57.210          1   0011.2567.d84d  ARPA   Vlan2

Internet  10.10.28.119           58   0011.2567.d84d  ARPA   Vlan29

I would have to wait three more hours for it to clear.

I have this problem too.
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lgijssel Tue, 08/30/2011 - 11:49

You could try it like this:

The following example shows how to refresh dynamically learned ARP cache entries for the host at 192.0.2.140:

Patrick McHenry Tue, 08/30/2011 - 11:54

Layer3Switch#clear arp-cache 10.10.XX.XXX?

% Unrecognized command

Doesn't recognize

version: 12.2(18)SXE2

lgijssel Tue, 08/30/2011 - 12:13

Yeah, there is still a lot of difference between the router images and those for switches.

That's why I said "you can try".

This was a command introduced in 12.0 so if possible, it would have been in there.

Nevermind. Only two hours to go before the problem resolves itself!

regards,

Leo

Patrick McHenry Tue, 08/30/2011 - 12:40

Thanks Leo. It was actually a dns issue. My Sys admin schooled me on it.

yadavsandip Wed, 08/31/2011 - 01:33

Hi,

What i know abt Dns is, it resoves ip to hostname vice versa;

  so how it is affected in ur case.

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Posted August 30, 2011 at 11:31 AM
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