Ejemplo n.º 1
0
    def test_bier_tail_o_udp(self):
        """BIER Tail over UDP"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(1, 0, BIERLength.BIER_LEN_256)
        bt = VppBierTable(self, bti, MPLS_LABEL_INVALID)
        bt.add_vpp_config()

        #
        # disposition table
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER route in table that's for-us
        #
        bier_route_1 = VppBierRoute(
            self, bti, 1,
            [VppRoutePath("0.0.0.0",
                          0xffffffff,
                          proto=DpoProto.DPO_PROTO_BIER,
                          nh_table_id=8)])
        bier_route_1.add_vpp_config()

        #
        # An entry in the disposition table
        #
        bier_de_1 = VppBierDispEntry(self, bdt.id, 99,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     DpoProto.DPO_PROTO_BIER,
                                     "0.0.0.0", 0, rpf_id=8192)
        bier_de_1.add_vpp_config()

        #
        # A multicast route to forward post BIER disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[VppMRoutePath(self.pg1.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)

        #
        # A packet with all bits set gets spat out to BP:1
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=333, dport=8138) /
             BIFT(sd=1, set=0, bsl=2, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255)*32,
                  BFRID=99) /
             IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) /
             Raw())

        rx = self.send_and_expect(self.pg0, [p], self.pg1)
Ejemplo n.º 2
0
    def bier_e2e(self, hdr_len_id, n_bytes, max_bp):
        """ BIER end-to-end"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(0, 0, hdr_len_id)
        bt = VppBierTable(self, bti, 77)
        bt.add_vpp_config()

        lowest = [b'\0'] * (n_bytes)
        lowest[-1] = scapy.compat.chb(1)
        highest = [b'\0'] * (n_bytes)
        highest[0] = scapy.compat.chb(128)

        #
        # Impostion Sets bit strings
        #
        bi_low = VppBierImp(self, bti, 333, lowest)
        bi_low.add_vpp_config()
        bi_high = VppBierImp(self, bti, 334, highest)
        bi_high.add_vpp_config()

        #
        # Add a multicast route that will forward into the BIER doamin
        #
        route_ing_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[VppMRoutePath(self.pg0.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
                   VppMRoutePath(0xffffffff,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                                 proto=DpoProto.DPO_PROTO_BIER,
                                 bier_imp=bi_low.bi_index)])
        route_ing_232_1_1_1.add_vpp_config()
        route_ing_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[VppMRoutePath(self.pg0.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
                   VppMRoutePath(0xffffffff,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                                 proto=DpoProto.DPO_PROTO_BIER,
                                 bier_imp=bi_high.bi_index)])
        route_ing_232_1_1_2.add_vpp_config()

        #
        # disposition table 8
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER routes in table that are for-us, resolving through
        # disp table 8.
        #
        bier_route_1 = VppBierRoute(
            self, bti, 1,
            [VppRoutePath("0.0.0.0",
                          0xffffffff,
                          proto=DpoProto.DPO_PROTO_BIER,
                          nh_table_id=8)])
        bier_route_1.add_vpp_config()
        bier_route_max = VppBierRoute(
            self, bti, max_bp,
            [VppRoutePath("0.0.0.0",
                          0xffffffff,
                          nh_table_id=8,
                          proto=DpoProto.DPO_PROTO_BIER)])
        bier_route_max.add_vpp_config()

        #
        # An entry in the disposition table for sender 333
        #  lookup in VRF 10
        #
        bier_de_1 = VppBierDispEntry(self, bdt.id, 333,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     DpoProto.DPO_PROTO_BIER,
                                     "0.0.0.0", 10, rpf_id=8192)
        bier_de_1.add_vpp_config()
        bier_de_1 = VppBierDispEntry(self, bdt.id, 334,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     DpoProto.DPO_PROTO_BIER,
                                     "0.0.0.0", 10, rpf_id=8193)
        bier_de_1.add_vpp_config()

        #
        # Add a multicast routes that will forward the traffic
        # post-disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            table_id=10,
            paths=[VppMRoutePath(self.pg1.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)
        route_eg_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            table_id=10,
            paths=[VppMRoutePath(self.pg1.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_eg_232_1_1_2.add_vpp_config()
        route_eg_232_1_1_2.update_rpf_id(8193)

        #
        # inject a packet in VRF-0. We expect it to be BIER encapped,
        # replicated, then hit the disposition and be forwarded
        # out of VRF 10, i.e. on pg1
        #
        p = (Ether(dst=self.pg0.local_mac,
                   src=self.pg0.remote_mac) /
             IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) /
             Raw(scapy.compat.chb(5) * 32))

        rx = self.send_and_expect(self.pg0, p*65, self.pg1)

        self.assertEqual(rx[0][IP].src, "1.1.1.1")
        self.assertEqual(rx[0][IP].dst, "232.1.1.1")

        p = (Ether(dst=self.pg0.local_mac,
                   src=self.pg0.remote_mac) /
             IP(src="1.1.1.1", dst="232.1.1.2") /
             UDP(sport=1234, dport=1234) /
             Raw(scapy.compat.chb(5) * 512))

        rx = self.send_and_expect(self.pg0, p*65, self.pg1)
        self.assertEqual(rx[0][IP].src, "1.1.1.1")
        self.assertEqual(rx[0][IP].dst, "232.1.1.2")
Ejemplo n.º 3
0
    def test_bier_tail(self):
        """BIER Tail"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(0, 0, BIERLength.BIER_LEN_256)
        bt = VppBierTable(self, bti, 77)
        bt.add_vpp_config()

        #
        # disposition table
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER route in table that's for-us
        #
        bier_route_1 = VppBierRoute(
            self, bti, 1,
            [VppRoutePath("0.0.0.0",
                          0xffffffff,
                          proto=DpoProto.DPO_PROTO_BIER,
                          nh_table_id=8)])
        bier_route_1.add_vpp_config()

        #
        # An entry in the disposition table
        #
        bier_de_1 = VppBierDispEntry(self, bdt.id, 99,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     DpoProto.DPO_PROTO_BIER,
                                     "0.0.0.0", 0, rpf_id=8192)
        bier_de_1.add_vpp_config()

        #
        # A multicast route to forward post BIER disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[VppMRoutePath(self.pg1.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)

        #
        # A packet with all bits set gets spat out to BP:1
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255)*32,
                  BFRID=99) /
             IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) /
             Raw())

        self.send_and_expect(self.pg0, [p], self.pg1)

        #
        # A packet that does not match the Disposition entry gets dropped
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255)*32,
                  BFRID=77) /
             IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) /
             Raw())
        self.send_and_assert_no_replies(self.pg0, p*2,
                                        "no matching disposition entry")

        #
        # Add the default route to the disposition table
        #
        bier_de_2 = VppBierDispEntry(self, bdt.id, 0,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     DpoProto.DPO_PROTO_BIER,
                                     "0.0.0.0", 0, rpf_id=8192)
        bier_de_2.add_vpp_config()

        #
        # now the previous packet is forwarded
        #
        self.send_and_expect(self.pg0, [p], self.pg1)

        #
        # A multicast route to forward post BIER disposition that needs
        # a check against sending back into the BIER core
        #
        bi = VppBierImp(self, bti, 333, scapy.compat.chb(0x3) * 32)
        bi.add_vpp_config()

        route_eg_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[VppMRoutePath(0xffffffff,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                                 proto=DpoProto.DPO_PROTO_BIER,
                                 bier_imp=bi.bi_index),
                   VppMRoutePath(self.pg1.sw_if_index,
                                 MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_eg_232_1_1_2.add_vpp_config()
        route_eg_232_1_1_2.update_rpf_id(8192)

        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255)*32,
                  BFRID=77) /
             IP(src="1.1.1.1", dst="232.1.1.2") /
             UDP(sport=1234, dport=1234) /
             Raw())
        self.send_and_expect(self.pg0, [p], self.pg1)
Ejemplo n.º 4
0
    def test_bier_tail_o_udp(self):
        """BIER Tail over UDP"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(1, 0, BIERLength.BIER_LEN_256)
        bt = VppBierTable(self, bti, MPLS_LABEL_INVALID)
        bt.add_vpp_config()

        #
        # disposition table
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER route in table that's for-us
        #
        bier_route_1 = VppBierRoute(self, bti, 1, [
            VppRoutePath("0.0.0.0",
                         0xffffffff,
                         proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                         nh_table_id=8)
        ])
        bier_route_1.add_vpp_config()

        #
        # An entry in the disposition table
        #
        bier_de_1 = VppBierDispEntry(self,
                                     bdt.id,
                                     99,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     FibPathProto.FIB_PATH_NH_PROTO_BIER,
                                     "0.0.0.0",
                                     0,
                                     rpf_id=8192)
        bier_de_1.add_vpp_config()

        #
        # A multicast route to forward post BIER disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[
                VppMRoutePath(self.pg1.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)
            ])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)

        #
        # A packet with all bits set gets spat out to BP:1
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=333, dport=8138) / BIFT(sd=1, set=0, bsl=2, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255) * 32,
                  BFRID=99) / IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) / Raw())

        rx = self.send_and_expect(self.pg0, [p], self.pg1)
Ejemplo n.º 5
0
    def bier_e2e(self, hdr_len_id, n_bytes, max_bp):
        """ BIER end-to-end"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(0, 0, hdr_len_id)
        bt = VppBierTable(self, bti, 77)
        bt.add_vpp_config()

        lowest = [b'\0'] * (n_bytes)
        lowest[-1] = scapy.compat.chb(1)
        highest = [b'\0'] * (n_bytes)
        highest[0] = scapy.compat.chb(128)

        #
        # Impostion Sets bit strings
        #
        bi_low = VppBierImp(self, bti, 333, lowest)
        bi_low.add_vpp_config()
        bi_high = VppBierImp(self, bti, 334, highest)
        bi_high.add_vpp_config()

        #
        # Add a multicast route that will forward into the BIER doamin
        #
        route_ing_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[
                VppMRoutePath(self.pg0.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
                VppMRoutePath(0xffffffff,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                              proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                              type=FibPathType.FIB_PATH_TYPE_BIER_IMP,
                              bier_imp=bi_low.bi_index)
            ])
        route_ing_232_1_1_1.add_vpp_config()
        route_ing_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[
                VppMRoutePath(self.pg0.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
                VppMRoutePath(0xffffffff,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                              proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                              type=FibPathType.FIB_PATH_TYPE_BIER_IMP,
                              bier_imp=bi_high.bi_index)
            ])
        route_ing_232_1_1_2.add_vpp_config()

        #
        # disposition table 8
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER routes in table that are for-us, resolving through
        # disp table 8.
        #
        bier_route_1 = VppBierRoute(self, bti, 1, [
            VppRoutePath("0.0.0.0",
                         0xffffffff,
                         proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                         nh_table_id=8)
        ])
        bier_route_1.add_vpp_config()
        bier_route_max = VppBierRoute(self, bti, max_bp, [
            VppRoutePath("0.0.0.0",
                         0xffffffff,
                         proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                         nh_table_id=8)
        ])
        bier_route_max.add_vpp_config()

        #
        # An entry in the disposition table for sender 333
        #  lookup in VRF 10
        #
        bier_de_1 = VppBierDispEntry(self,
                                     bdt.id,
                                     333,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     FibPathProto.FIB_PATH_NH_PROTO_BIER,
                                     "0.0.0.0",
                                     10,
                                     rpf_id=8192)
        bier_de_1.add_vpp_config()
        bier_de_1 = VppBierDispEntry(self,
                                     bdt.id,
                                     334,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     FibPathProto.FIB_PATH_NH_PROTO_BIER,
                                     "0.0.0.0",
                                     10,
                                     rpf_id=8193)
        bier_de_1.add_vpp_config()

        #
        # Add a multicast routes that will forward the traffic
        # post-disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            table_id=10,
            paths=[
                VppMRoutePath(self.pg1.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)
            ])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)
        route_eg_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            table_id=10,
            paths=[
                VppMRoutePath(self.pg1.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)
            ])
        route_eg_232_1_1_2.add_vpp_config()
        route_eg_232_1_1_2.update_rpf_id(8193)

        #
        # inject a packet in VRF-0. We expect it to be BIER encapped,
        # replicated, then hit the disposition and be forwarded
        # out of VRF 10, i.e. on pg1
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src="1.1.1.1", dst="232.1.1.1") / UDP(sport=1234, dport=1234) /
             Raw(scapy.compat.chb(5) * 32))

        rx = self.send_and_expect(self.pg0, p * NUM_PKTS, self.pg1)

        self.assertEqual(rx[0][IP].src, "1.1.1.1")
        self.assertEqual(rx[0][IP].dst, "232.1.1.1")

        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src="1.1.1.1", dst="232.1.1.2") / UDP(sport=1234, dport=1234) /
             Raw(scapy.compat.chb(5) * 512))

        rx = self.send_and_expect(self.pg0, p * NUM_PKTS, self.pg1)
        self.assertEqual(rx[0][IP].src, "1.1.1.1")
        self.assertEqual(rx[0][IP].dst, "232.1.1.2")
Ejemplo n.º 6
0
    def test_bier_tail(self):
        """BIER Tail"""

        #
        # Add a BIER table for sub-domain 0, set 0, and BSL 256
        #
        bti = VppBierTableID(0, 0, BIERLength.BIER_LEN_256)
        bt = VppBierTable(self, bti, 77)
        bt.add_vpp_config()

        #
        # disposition table
        #
        bdt = VppBierDispTable(self, 8)
        bdt.add_vpp_config()

        #
        # BIER route in table that's for-us
        #
        bier_route_1 = VppBierRoute(self, bti, 1, [
            VppRoutePath("0.0.0.0",
                         0xffffffff,
                         proto=FibPathProto.FIB_PATH_NH_PROTO_BIER,
                         nh_table_id=8)
        ])
        bier_route_1.add_vpp_config()

        #
        # An entry in the disposition table
        #
        bier_de_1 = VppBierDispEntry(self,
                                     bdt.id,
                                     99,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     FibPathProto.FIB_PATH_NH_PROTO_BIER,
                                     "0.0.0.0",
                                     0,
                                     rpf_id=8192)
        bier_de_1.add_vpp_config()

        #
        # A multicast route to forward post BIER disposition
        #
        route_eg_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[
                VppMRoutePath(self.pg1.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)
            ])
        route_eg_232_1_1_1.add_vpp_config()
        route_eg_232_1_1_1.update_rpf_id(8192)

        #
        # A packet with all bits set gets spat out to BP:1
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255) * 32,
                  BFRID=99) / IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) / Raw())

        self.send_and_expect(self.pg0, [p], self.pg1)

        #
        # A packet that does not match the Disposition entry gets dropped
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255) * 32,
                  BFRID=77) / IP(src="1.1.1.1", dst="232.1.1.1") /
             UDP(sport=1234, dport=1234) / Raw())
        self.send_and_assert_no_replies(self.pg0, p * 2,
                                        "no matching disposition entry")

        #
        # Add the default route to the disposition table
        #
        bier_de_2 = VppBierDispEntry(self,
                                     bdt.id,
                                     0,
                                     BIER_HDR_PAYLOAD.BIER_HDR_PROTO_IPV4,
                                     FibPathProto.FIB_PATH_NH_PROTO_BIER,
                                     "0.0.0.0",
                                     0,
                                     rpf_id=8192)
        bier_de_2.add_vpp_config()

        #
        # now the previous packet is forwarded
        #
        self.send_and_expect(self.pg0, [p], self.pg1)

        #
        # A multicast route to forward post BIER disposition that needs
        # a check against sending back into the BIER core
        #
        bi = VppBierImp(self, bti, 333, scapy.compat.chb(0x3) * 32)
        bi.add_vpp_config()

        route_eg_232_1_1_2 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.2",
            32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            paths=[
                VppMRoutePath(0xffffffff,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD,
                              proto=DpoProto.DPO_PROTO_BIER,
                              type=FibPathType.FIB_PATH_TYPE_BIER_IMP,
                              bier_imp=bi.bi_index),
                VppMRoutePath(self.pg1.sw_if_index,
                              MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)
            ])
        route_eg_232_1_1_2.add_vpp_config()
        route_eg_232_1_1_2.update_rpf_id(8192)

        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             MPLS(label=77, ttl=255) /
             BIER(length=BIERLength.BIER_LEN_256,
                  BitString=scapy.compat.chb(255) * 32,
                  BFRID=77) / IP(src="1.1.1.1", dst="232.1.1.2") /
             UDP(sport=1234, dport=1234) / Raw())
        self.send_and_expect(self.pg0, [p], self.pg1)