[c-nsp] BGP ORR - experiences

[Mark Tinka]

On 15/10/2025 09:23, Saku Ytti via cisco-nsp wrote:

> We use ORR and add-path 3 (to enable ECMP and to have backup) with
> about 40 ORR perspectives and +15M RIB. But this is Junos running on
> compute.
>
> You really want compute, not actual router hardware as the CPU gains
> from modern compute are very significant.

In my IP days (up until about 2 years ago), we ran Add-Paths on a Cisco 
CSR1000v (was in the process of transitioning to the 8000v) route 
reflector with Junos clients.

Worked very well that we did not need ORR, having up to 6 paths per 
client with BGP Multipath enabled as well.

Ate a lot of CPU and RAM on the clients, but I've since heard that those 
RE's were upgraded, so no more concern.

Being able to load balance traffic to the same AS across different 
cities/regions was very sweet. Opened up some new commercial 
opportunities the competition could not support.

Mark.