ipv6 support tcp connection with bgp open messages

Signed-off-by: Peng Xiao <xiaoquwl@gmail.com>

yabgp/core/protocol.py

@@ -92,7 +92,11 @@ def connectionMade(self):
         # Set the local BGP id from the local IP address if it's not set
         if self.factory.bgp_id is None:
             try:
-                self.factory.bgp_id = int(netaddr.IPAddress(self.transport.getHost().host))
+                local_host_addr = netaddr.IPAddress(self.transport.getHost().host)
+                if 'IPv6' in local_host_addr.info:
+                    self.factory.bgp_id = int(netaddr.IPAddress('127.0.0.1'))
+                else:
+                    self.factory.bgp_id = int(local_host_addr)
             except Exception as e:
                 LOG.error(e)
                 error_str = traceback.format_exc()