From 6b5a8649a48d7616efbc798095eee2c10563b4e6 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Thu, 8 Apr 2010 17:56:56 +0200
Subject: [PATCH] Do not export empty community list attribute in BGP.

---
 proto/bgp/attrs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 9bcd4f88..c1b8fd1e 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -515,6 +515,10 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
       flags = a->flags & (BAF_OPTIONAL | BAF_TRANSITIVE | BAF_PARTIAL);
       len = bgp_get_attr_len(a);
 
+      /* Skip empty int sets */ 
+      if (((a->type & EAF_TYPE_MASK) == EAF_TYPE_INT_SET) && (len == 0))
+	continue; 
+
       if (remains < len + 4)
 	goto err_no_buffer;