Juniper conditional BGP announcement PoC

r2_conditional-announcement.patch

[edit policy-options]
+   prefix-list DC1-aggregate {
+       10.10.0.0/23;
+   }
[edit policy-options]
+   policy-statement ISP-B-out-v4 {
+       term conditional-announcement {
+           from {
+               prefix-list DC1-aggregate;
+               condition conditional-announcement;
+           }
+           then reject;
+       }
+       then next policy;
+   }
+   policy-statement from-ISP-A {
+       term allow-from-ISP-A {
+           from community from-ISP-A;
+           then accept;
+       }
+       term reject-all {
+           then reject;
+       }
+   }
[edit policy-options]
+   community from-ISP-A members 64512:10;
[edit policy-options]
+   condition conditional-announcement {
+       if-route-exists {
+           0.0.0.0/0;
+           table conditional.inet.0;
+       }
+   }
[edit]
+  routing-instances {
+      conditional {
+          instance-type virtual-router;
+      }
+  }
[edit routing-options]
+  rib-groups {
+      conditional {
+          import-rib [ inet.0 conditional.inet.0 ];
+          import-policy from-ISP-A;
+      }
+  }
[edit protocols bgp group ebgp]
-    export [ AS64512-aggregates-v4 reject-all ];
+    export [ ISP-B-out-v4 AS64512-aggregates-v4 reject-all ];
[edit protocols bgp group ibgp]
+     family inet {
+         unicast {
+             rib-group conditional;
+         }
+     }