In networks that have Flowspec and Redirect to IP capabilities, PBR can be implemented by means of Flowspec policies. Refer details in Flowspec policies.
In order to use assigned providers or peers on Internet Exchanges in IRP the same set of source IP addresses and DSCP values (for Internet Exchanges) are assigned to individual providers/peers. These values are used to automatically generate Flowspec policies that redirect IRP probes to designated next-hops.
In order to use this feature global.flowspec, global.flowspec.pbr and bgpd.peer.X.flowspec must be enabled.
Flowspec PBR cannot be used during non-intrusive (global.nonintrusive_bgp) mode.