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diff --git a/src/vnet/bier/bier_imp.h b/src/vnet/bier/bier_imp.h
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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * 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.
+ */
+/**
+ * bier_imposition : The BIER imposition object
+ *
+ * A BIER imposition object is present in the IP mcast output list
+ * and represents the imposition of a BIER bitmask. After BIER header
+ * imposition the packet is forward within the appropriate/specifid
+ * BIER table
+ */
+
+#ifndef __BIER_IMPOSITION_H__
+#define __BIER_IMPOSITION_H__
+
+#include <vnet/bier/bier_types.h>
+#include <vnet/fib/fib_types.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * The BIER imposition object
+ */
+typedef struct bier_imp_t_ {
+    /**
+     * The BIER table into which to forward the post imposed packet
+     */
+    bier_table_id_t bi_tbl;
+
+    /**
+     * number of locks
+     */
+    u32 bi_locks;
+
+    /**
+     * The DPO contirubted from the resolving BIER table.
+     * One per-IP protocol. This allows us to share a BIER imposition
+     * object for a IPv4 and IPv6 mfib path.
+     */
+    dpo_id_t bi_dpo[FIB_PROTOCOL_IP_MAX];
+
+    /**
+     * The Header to impose.
+     */
+    bier_hdr_t bi_hdr;
+
+    /**
+     * The bit string.
+     *  This is a memory v. speed tradeoff. We inline here the
+     *  largest header type so as the bitstring is on the same
+     *  cacheline as the header.
+     */
+    bier_bit_mask_4096_t bi_bits;
+} bier_imp_t;
+
+extern index_t bier_imp_add_or_lock(const bier_table_id_t *bt,
+                                    bier_bp_t sender,
+                                    const bier_bit_string_t *bs);
+
+extern void bier_imp_unlock(index_t bii);
+extern void bier_imp_lock(index_t bii);
+
+extern u8* format_bier_imp(u8* s, va_list *ap);
+
+extern void bier_imp_contribute_forwarding(index_t bii,
+                                           dpo_proto_t proto,
+                                           dpo_id_t *dpo);
+
+extern bier_imp_t *bier_imp_pool;
+
+always_inline bier_imp_t*
+bier_imp_get (index_t bii)
+{
+    return (pool_elt_at_index(bier_imp_pool, bii));
+}
+
+#endif