diff --git a/yabgp/message/attribute/linkstate/linkstate.py b/yabgp/message/attribute/linkstate/linkstate.py
index 235fb09..a2537f4 100644
--- a/yabgp/message/attribute/linkstate/linkstate.py
+++ b/yabgp/message/attribute/linkstate/linkstate.py
@@ -58,7 +58,7 @@ def unpack(cls, data, bgpls_pro_id=None):
         while data:
             type_code, length = struct.unpack('!HH', data[:4])
             value = data[4: 4+length]
-            if type_code in [1099, 1100] and type_code in cls.registered_tlvs:
+            if type_code in [1099, 1100, 1158] and type_code in cls.registered_tlvs:
                 tlvs.append(cls.registered_tlvs[type_code].unpack(value, bgpls_pro_id).dict())
             elif type_code in cls.registered_tlvs:
                 tlvs.append(cls.registered_tlvs[type_code].unpack(value).dict())
diff --git a/yabgp/message/attribute/linkstate/prefix/prefix_sid.py b/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
index 918929a..4444bb7 100644
--- a/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
+++ b/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
@@ -29,6 +29,25 @@
 #    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
 
+# isis
+#  0 1 2 3 4 5 6 7
+#  +-+-+-+-+-+-+-+-+
+#  |R|N|P|E|V|L|   |
+#  +-+-+-+-+-+-+-+-+
+
+# ospf
+#  0 1  2 3 4 5 6 7
+# +-+--+-+-+-+-+-+-+
+# | |NP|M|E|V|L| | |
+# +-+--+-+-+-+-+-+-+
+
+# ospfv3
+#  0 1  2 3 4 5 6 7
+# +-+--+-+-+-+-+-+-+
+# | |NP|M|E|V|L| | |
+# +-+--+-+-+-+-+-+-+
+
+
 @LinkState.register()
 class PrefixSID(TLV):
     """
@@ -38,6 +57,23 @@ class PrefixSID(TLV):
     TYPE_STR = 'prefix_sid'
 
     @classmethod
-    def unpack(cls, data):
+    def unpack(cls, data, pro_id):
+
+        flags = ord(data[0:1])
+        flag = {}
+        if pro_id in [1, 2]:
+            flag['R'] = flags >> 7
+            flag['N'] = (flags << 1) % 256 >> 7
+            flag['P'] = (flags << 2) % 256 >> 7
+            flag['E'] = (flags << 3) % 256 >> 7
+            flag['V'] = (flags << 4) % 256 >> 7
+            flag['L'] = (flags << 5) % 256 >> 7
+        else:  # 3, 6
+            flag['NP'] = (flags << 1) % 256 >> 7
+            flag['M'] = (flags << 2) % 256 >> 7
+            flag['E'] = (flags << 3) % 256 >> 7
+            flag['V'] = (flags << 4) % 256 >> 7
+            flag['L'] = (flags << 5) % 256 >> 7
+
         algorithm = ord(data[1:2])
-        return cls(value={"algorithm": algorithm, "sid": int(binascii.b2a_hex(data[4:]), 16)})
+        return cls(value={"flags": flag, "algorithm": algorithm, "sid": int(binascii.b2a_hex(data[4:]), 16)})
diff --git a/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py b/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py
new file mode 100644
index 0000000..d40483f
--- /dev/null
+++ b/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py
@@ -0,0 +1,63 @@
+# Copyright 2015-2017 Cisco Systems, Inc.
+# All rights reserved.
+#
+#    Licensed under the Apache License, version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+""" Test Link State attribute"""
+
+import unittest
+from yabgp.message.attribute.linkstate.linkstate import LinkState
+
+
+class TestLinkStatePrefixSID(unittest.TestCase):
+
+    def test_prefix_sid_flags_ospf(self):
+        self.maxDiff = None
+        data_bin = b'\x04\x86\x00\x07\xb4\x00\x00\x00\x00\x61\xa9'
+
+        data_dict = {29: [{
+            'type': 'prefix_sid',
+            'value': {
+                'sid': 25001,
+                'flags': {
+                    'NP': 0,
+                    'M': 1,
+                    'E': 1,
+                    'V': 0,
+                    'L': 1
+                },
+                'algorithm': 0
+            }
+        }]}
+        self.assertEqual(data_dict, LinkState.unpack(data_bin, 3).dict())
+
+    def test_prefix_id_flags_isis(self):
+        self.maxDiff = None
+        data_bin = b'\x04\x86\x00\x07\xb4\x00\x00\x00\x00\x61\xa9'
+
+        data_dict = {29: [{
+            'type': 'prefix_sid',
+            'value': {
+                'sid': 25001,
+                'flags': {
+                    'R': 1,
+                    'N': 0,
+                    'P': 1,
+                    'E': 1,
+                    'V': 0,
+                    'L': 1
+                },
+                'algorithm': 0
+            }
+        }]}
+        self.assertEqual(data_dict, LinkState.unpack(data_bin, 1).dict())