HOWTO:Cisco
From BCP38
You will find a clear description from Cisco at the following link.
http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html
It cover both IOS and their firewall platforms PIX/ASA/FWSM.
Experiences
- Cisco ASA/PIX/FWSM
- Good ol' C7206VXR in a Lab