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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 +1,58 @@
+# http://trac.secdev.org/scapy/ticket/31
+
+# scapy.contrib.description = BIER
+# 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
+ BIER_LEN_512 = 3
+ BIER_LEN_1024 = 4
+
+
+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),
+ BitFieldLenField("length", BIERLength.BIER_LEN_256, 4,
+ length_of=lambda x:(x.BitString >> 8)),
+ BitField("entropy", 0, 20),
+ BitField("OAM", 0, 2),
+ BitField("RSV", 0, 2),
+ BitField("DSCP", 0, 6),
+ BitEnumField("Proto", 2, 6, BIERnhcls),
+ ShortField("BFRID", 0),
+ StrLenField("BitString",
+ "",
+ length_from=lambda x:(8 << x.length))]
+
+
+bind_layers(BIER, IP, Proto=4)
+bind_layers(BIER, IPv6, Proto=5)
+bind_layers(UDP, BIFT, dport=8138)
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