[j-nsp] BGP Peering Policies - Best Practices

[adamv0025 at netconsultings.com]

> From: Niall Donaghy <niall.donaghy at geant.org>
> Sent: Wednesday, May 22, 2019 12:31 PM
> 
> OP>> Are there non-technical reasons for leaving the Internet on the
default
> RIB?
> Adam> Are there technical reasons please?
> 
> How about:
> 
>   uRPF causing discarded packets in a multi-VRF environment, eg:
>     - Internet VRF, Private VRF #1, Private VRF #2.
>     - Customers connect to all and advertise same prefixes to all.
>     - Peers connect to perhaps Internet and a Private VRF and advertise
same
> prefixes to all.
>     - Private VRFs reach Internet VRF via default routes over logical
tunnels
> (BGP).
>     - uRPF loose causes discards for some asymmetric traffic flows
crossing
> multiple VRFs.
> 
I have a sympathy for your convoluted setup, however the above argument is a
strawman logical fallacy unless you can show how moving to Internet in a
default table would have helped to solve the uRPF problem.

adam