[c-nsp] Implementing Unicast RPF multi-homed network

[Pete Templin]

root net wrote:
> I was wondering where the best place would be to implement Unicast RPF on a
> multi-homed network with full routes / filtered routes and private peering
> interconnects with local ISPs (small businesses).
Strict mode for single-homed customers, loose mode for multi-homed 
customers and upstreams.

Loose mode on upstream ports essentially gains you source blackhole and 
some level of bogon filtering.

pt