[c-nsp] clear arp-cache interface on Subinterfaces?

[Clinton Work]

I often use this trick to clear a single ARP entry:

conf t
no arp x.x.x.x
end

Works with at least IOS 12.0 and onwards.


Sascha E. Pollok wrote:
> Folks,
> 
> I recently had to debug some customer's ARP problem.
> Due to this, I had to flush several of his MAC addresses
> from our arp-cache more than once. I found, that the
> "clear arp-cache" command supports giving the related
> interface using "clear arp-cache interface FastEthernet..".
> 
> This is not bad but why doesn't IOS support FastEthernet
> subinterface-numbers like "clear arp-cache interface FastEthernet0/1.15" ?
> 
> I am still able to clear the arp cache by shut-noshut the interface
> but I am wondering why I can give the physical interface, only.