+ if id_len > 0:
+ # sub-option 151 encode vss_type of 0
+ # followerd by vpn_id in ascii
+ self.assertEqual(oui, 0)
+ self.assertEqual(ord(data[12]), 151)
+ self.assertEqual(ord(data[13]), id_len+1)
+ self.assertEqual(ord(data[14]), 0)
+ self.assertEqual(data[15:15+id_len], vpn_id)
+
+ # VSS control sub-option
+ self.assertEqual(ord(data[15+len(vpn_id)]), 152)
+ self.assertEqual(ord(data[16+len(vpn_id)]), 0)
+