我們今天要來設定 PBR，我們以 Juniper MX 為例

首先，我們要先決定一個 routing-instance，可以把他當作一個獨立的路由表

set routing-instance PBR-WARP instance-type forwarding
set routing-instance PBR-WARP routing-options static route 0.0.0.0/0 next-hop x.x.x.

接著，設定 RIB Group 及路由策略

set routing-options rib-group INT-ROUTES import-rib [ inet.0 PBR-WARP.inet.0 ]
set routing-options interface-routes rib-group inet INT-ROUTES

最後設定路由規則

set firewall family inet filter PBR-WARP term 1 from source-address y.y.y.y/z
set firewall family inet filter PBR-WARP term 1 then routing-instance PBR-WARP-RI

再到網卡介面設定 filter

unit 7 {                        
            vlan-id 700;                
            family inet {               
                rpf-check fail-filter rpf-exception;
                filter {                
                    input PBR-WARP;     
                }                       
                address 172.16.0.254/24;
            }                           
        }

完成！