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diff --git a/scapy/contrib/bier.py b/scapy/contrib/bier.py
new file mode 100644
index 0000000..e173cdb
--- /dev/null
+++ b/scapy/contrib/bier.py
@@ -0,0 +1,53 @@
+# http://trac.secdev.org/scapy/ticket/31
+
+# scapy.contrib.description = MPLS
+# scapy.contrib.status = loads
+
+from scapy.packet import *
+from scapy.fields import *
+from scapy.layers.inet import IP, UDP
+from scapy.layers.inet6 import IPv6
+
+class BIERLength:
+ BIER_LEN_64 = 0
+ BIER_LEN_128 = 1
+ BIER_LEN_256 = 2
+
+
+BIERnhcls = { 1: "MPLS",
+ 2: "MPLS",
+ 4: "IPv4",
+ 5: "IPv6" }
+
+
+class BIFT(Packet):
+ name = "BIFT"
+ fields_desc = [ BitField("bsl", 0, 4),
+ BitField("sd", 0, 8),
+ BitField("set", 0, 8),
+ BitField("cos", 0, 3),
+ BitField("s", 1, 1),
+ ByteField("ttl", 0) ]
+
+ def guess_payload_class(self, payload):
+ return BIER
+
+
+class BIER(Packet):
+ name = "BIER"
+ fields_desc = [ BitField("id", 5, 4),
+ BitField("version", 0, 4),
+ BitField("length", 0, 4),
+ BitField("entropy", 0, 20),
+ BitField("OAM", 0, 2),
+ BitField("RSV", 0, 2),
+ BitField("DSCP", 0, 6),
+ BitEnumField("Proto", 2, 6, BIERnhcls),
+ ShortField("BFRID", 0),
+ StrFixedLenField("BitString",
+ chr(255)*32, 32) ]
+
+
+bind_layers(BIER, IP, Proto=4)
+bind_layers(BIER, IPv6, Proto=5)
+bind_layers(UDP, BIFT, dport=8138)
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