feat(bird): ibgp and rr

bird/ibgp.conf

@@ -4,7 +4,7 @@ template bgp ibgp_peers {
     graceful restart on;
     # bfd on;
     ipv4 {
-        next hop self;
+        next hop self ebgp;
         igp table OSPF_table;
         table BGP_table;
         import filter {

bird/ibgp_rrs.conf

@@ -0,0 +1,62 @@
+template bgp ibgp_peers {
+    local as LOCAL_ASN;
+    source address SERVE_IP;
+    graceful restart on;
+    # bfd on;
+    ipv4 {
+        next hop self ebgp;
+        igp table OSPF_table;
+        table BGP_table;
+        import filter {
+            dn11_update_cross_ibgp();
+            accept;
+        };
+        export filter {
+            if source != RTS_BGP then reject;
+            dn11_update_server_location();
+            unset(bgp_med);
+            accept;
+        };
+    };
+}
+
+template bgp ibgp_rrs {
+    local as LOCAL_ASN;
+    source address SERVE_IP;
+    rr client;
+    rr cluster id <cluster_id, an ip>;
+    graceful restart on;
+    # bfd on;
+    ipv4 {
+        next hop self ebgp;
+        igp table OSPF_table;
+        table BGP_table;
+        import filter {
+            dn11_update_cross_ibgp();
+            accept;
+        };
+        export filter {
+            if source != RTS_BGP then reject;
+            dn11_update_server_location();
+            unset(bgp_med);
+            accept;
+        };
+    };
+}
+
+# plain ibgp between RRs
+protocol bgp IBGP_<name> from ibgp_peers {
+    neighbor <peer_serve_ip> internal;
+}
+
+# ibgp from RR Server to RR Client
+protocol bgp IBGP_<name> from ibgp_rrs {
+    neighbor <peer_serve_ip> internal;
+}
+
+# or a dynamic protocol
+protocol bgp IBGP_RRClient from ibgp_rrs {
+    neighbor range <your_cidr> external;
+    dynamic name "RRClient";
+    # password "string" # when needed
+}