[c-nsp] uRPF Black hole routing with asymmetric traffic

[Roland Dobbins]

On 14 Oct 2015, at 2:58, Andrew Smith wrote:

> Finally, what are the contents of access-list 2699? I assume it's a
> whitelist of IPs to not drop traffic from, even if there aren't 
> discrete
> routes in the routing table for?

I'd forgotten about that option - always a bad idea, as it causes 
performance issues.

Allow-default is useful in circumstances where a default is present - it 
essentially renders the uRPF 'S/RTBH-only'

-----------------------------------
Roland Dobbins <rdobbins at arbor.net>