diff --git a/bird/template/dn42.conf b/bird/template/dn42.conf
index e821d45..ae65731 100644
--- a/bird/template/dn42.conf
+++ b/bird/template/dn42.conf
@@ -4,19 +4,34 @@ template bgp dn42_bgp_up {
     ipv4 {
         table dn42v4;
         import filter {
-          if is_dn42_prefix() && !dn42_is_self_net() then accept;
-          reject;
+          if !is_dn42_prefix() then reject;
+          if dn42_is_self_net() then reject;
+          bgp_large_community.add((DN42_ASN,200,0));# 传输到Ebgp
+          accept;
+        };
+        export filter { 
+            if !is_dn42_prefix() then reject; 
+            if source !~ [RTS_STATIC, RTS_BGP] then reject;
+            if bgp_large_community !~ [(DN42_ASN, 200,0)] then reject;      
+            accept;
         };
-        export filter { if is_dn42_prefix() && source ~ [RTS_STATIC, RTS_BGP] then accept; else reject; };
         import limit 9000 action block; 
     };
+
     ipv6 {
         table dn42v6;
         import filter {
-          if is_dn42_prefix() && !dn42_is_self_net_v6() then accept;
-          reject;
+          if !is_dn42_prefix() then reject;
+          if dn42_is_self_net_v6() then reject;
+          bgp_large_community.add((DN42_ASN,200,0));# 传输到Ebgp
+          accept;
+        };
+        export filter { 
+            if !is_dn42_prefix() then reject; 
+            if source !~ [RTS_STATIC, RTS_BGP] then reject;
+            if bgp_large_community !~ [(DN42_ASN, 200,0)] then reject;      
+            accept;
         };
-        export filter { if is_dn42_prefix() && source ~ [RTS_STATIC, RTS_BGP] then accept; else reject; };
         import limit 9000 action block; 
     };
 }