It's only supported on the 15.2(4)S and later not the SRE train. I might consider an upgrade. One more question regarding this, can you configure the RR to be the main and shadow RR? Mohamed Kamal Core Network Sr. Engineer On 8/24/2015 9:16 PM, Diptanshu Singh wrote: > BGP Add-Path might be your friend . You can look at diverse-path as well .