diff --git a/bird/net/dn42.conf b/bird/net/dn42.conf
index af0f386..bfd1a79 100644
--- a/bird/net/dn42.conf
+++ b/bird/net/dn42.conf
@@ -4,8 +4,11 @@ template bgp dn42_bgp_up {
     ipv4 {
         table dn42v4;
         import filter {
-          if dn42_is_valid_network() && !dn42_is_self_net() then accept;
-          reject;
+          if !dn42_is_valid_network() then reject;
+          if dn42_is_self_net() then reject;
+          bgp_large_community.empty;  
+          bgp_large_community.add((DN42_ASN,200,0));# 传输到Ebgp
+          accept;
         };
         export filter { 
             if !dn42_is_valid_network() then reject; 
@@ -19,8 +22,11 @@ template bgp dn42_bgp_up {
     ipv6 {
         table dn42v6;
         import filter {
-          if dn42_is_valid_network_v6() && !dn42_is_self_net_v6() then accept;
-          reject;
+          if !dn42_is_valid_network_v6() then reject;
+          if dn42_is_self_net_v6() then reject;
+          bgp_large_community.empty;  
+          bgp_large_community.add((DN42_ASN,200,0));# 传输到Ebgp
+          accept;
         };
         export filter { 
             if !dn42_is_valid_network_v6() then reject; 
diff --git a/bird/net/unet.conf b/bird/net/unet.conf
index bfad356..50aae72 100644
--- a/bird/net/unet.conf
+++ b/bird/net/unet.conf
@@ -4,8 +4,11 @@ template bgp unet_bgp_up1 {
     ipv4 {
         table unet4;
         import filter {
-          if unet_is_valid_network_v4() && !unet_is_self_net() then accept;
-          reject;
+          if !unet_is_valid_network_v4() then reject;
+          if unet_is_self_net() then reject;
+          bgp_large_community.empty;  
+          bgp_large_community.add((UNET_ASN,200,0));# 传输到Ebgp
+          accept;
         };
         export filter { 
             if !unet_is_valid_network_v4() then reject;