On 15 Nov 2010, at 10:27, Viktor Steinmann wrote:

> Wouldn't that do it?
> 
> !
> route-map bar deny 10
> match invalid

Hi,

Works *only* if you had a direct adjacency with the network being spoofed.  If 
your upstream sends you a /22, and a spoofed /24, you can drop the spoofed /24, 
but as soon as you send the packet upstream, it will still end up with the 
spoofer.

Another argument in favour of being widely peered. :-)

Andy



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