From c560908633d03ec640518604c2f978591d1ab878 Mon Sep 17 00:00:00 2001
From: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Date: Tue, 6 May 2014 05:14:22 +0000
Subject: packet/bgp: fix bug in serializing AS PATH path attribute

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/lib/packet/bgp.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ryu/lib/packet/bgp.py b/ryu/lib/packet/bgp.py
index 06323a85..e488653d 100644
--- a/ryu/lib/packet/bgp.py
+++ b/ryu/lib/packet/bgp.py
@@ -1265,6 +1265,8 @@ class _BGPPathAttributeAsPathCommon(_PathAttribute):
                 type_ = self._AS_SEQUENCE
             l = list(e)
             num_as = len(l)
+            if num_as == 0:
+                continue
             msg_pack_into(self._SEG_HDR_PACK_STR, buf, offset, type_, num_as)
             offset += struct.calcsize(self._SEG_HDR_PACK_STR)
             for i in l:
-- 
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