Now let's look at route origin validation. For this a router must support rpki the router will check the validator using the RTR protocol RTR is the rpki to router protocol described in RFC 8210 validation returns three states valid means when authorization is found for prefix X coming from a sy invalid is when authorization is found for prefix X but not from sy are not the allowable subnet size not found is where no authorization data is fine for prefix X.

Related Documents

Exercises

© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon. 

Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

This is a human-readable summary of (and not a substitute for) the license. Disclaimer.
You are free to:

Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:

Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
NonCommercial — You may not use the material for commercial purposes.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.