diff --git a/test/test_urpf.py b/test/test_urpf.py
index 8f4e563..e0dc121 100644
--- a/test/test_urpf.py
+++ b/test/test_urpf.py
@@ -15,7 +15,7 @@
 
 
 class TestURPF(VppTestCase):
-    """ Unicast Reverse Path Forwarding Test Case """
+    """Unicast Reverse Path Forwarding Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -47,26 +47,27 @@
         super(TestURPF, self).tearDown()
 
     def test_urpf4(self):
-        """ uRPF IP4 """
+        """uRPF IP4"""
 
         e = VppEnum
-        p_spoof_loose = (Ether(dst=self.pg0.local_mac,
-                               src=self.pg0.remote_mac) /
-                         IP(src="3.3.3.3", dst=self.pg1.remote_ip4) /
-                         UDP(sport=1234, dport=1234) /
-                         Raw(b'\xa5' * 100)) * N_PKTS
-        p_spoof_strict = (Ether(dst=self.pg0.local_mac,
-                                src=self.pg0.remote_mac) /
-                          IP(src=self.pg2.remote_ip4,
-                             dst=self.pg1.remote_ip4) /
-                          UDP(sport=1234, dport=1234) /
-                          Raw(b'\xa5' * 100)) * N_PKTS
-        p_good = (Ether(dst=self.pg0.local_mac,
-                        src=self.pg0.remote_mac) /
-                  IP(src=self.pg0.remote_ip4,
-                     dst=self.pg1.remote_ip4) /
-                  UDP(sport=1234, dport=1234) /
-                  Raw(b'\xa5' * 100)) * N_PKTS
+        p_spoof_loose = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IP(src="3.3.3.3", dst=self.pg1.remote_ip4)
+            / UDP(sport=1234, dport=1234)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
+        p_spoof_strict = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IP(src=self.pg2.remote_ip4, dst=self.pg1.remote_ip4)
+            / UDP(sport=1234, dport=1234)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
+        p_good = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
+            / UDP(sport=1234, dport=1234)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
 
         #
         # before adding the uRPF, ensure all packets are forwarded
@@ -78,10 +79,12 @@
         #
         # apply loose uRPF check on pg0 rx
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         # good packets still pass
         self.send_and_expect(self.pg0, p_good, self.pg1)
@@ -90,16 +93,17 @@
         # packets from address to which there is no route are dropped
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip4-rx-urpf-loose/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip4-rx-urpf-loose/uRPF Drop", N_PKTS)
 
         #
         # crank it up to strict mode
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         # good packets still pass
         self.send_and_expect(self.pg0, p_good, self.pg1)
@@ -107,16 +111,17 @@
         self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip4-rx-urpf-strict/uRPF Drop",
-                                        2 * N_PKTS)
+        self.assert_error_counter_equal("/err/ip4-rx-urpf-strict/uRPF Drop", 2 * N_PKTS)
 
         #
         # disable uRPF, all traffic should pass
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
@@ -129,22 +134,25 @@
         #  for strict they should not be forwarded if they would be
         #  forwarded thru that interface.
         #
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip4-tx-urpf-loose/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip4-tx-urpf-loose/uRPF Drop", N_PKTS)
 
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         # the strict packet, from a peer is allowed, since it does
@@ -152,48 +160,49 @@
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop", N_PKTS)
 
         # change the strict packet so that it would forward through pg1
-        p_spoof_strict = (Ether(dst=self.pg0.local_mac,
-                                src=self.pg0.remote_mac) /
-                          IP(src=self.pg1.remote_ip4,
-                             dst=self.pg1.remote_ip4) /
-                          UDP(sport=1234, dport=1234) /
-                          Raw(b'\xa5' * 100)) * N_PKTS
+        p_spoof_strict = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IP(src=self.pg1.remote_ip4, dst=self.pg1.remote_ip4)
+            / UDP(sport=1234, dport=1234)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
 
         self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
-        self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop",
-                                        2 * N_PKTS)
+        self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop", 2 * N_PKTS)
 
         # cleanup
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
-                              af=e.vl_api_address_family_t.ADDRESS_IP4,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
+            af=e.vl_api_address_family_t.ADDRESS_IP4,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
     def test_urpf6(self):
-        """ uRPF IP6 """
+        """uRPF IP6"""
 
         e = VppEnum
-        p_spoof_loose = (Ether(dst=self.pg0.local_mac,
-                               src=self.pg0.remote_mac) /
-                         IPv6(src="3::3", dst=self.pg1.remote_ip6) /
-                         UDP(sport=1236, dport=1236) /
-                         Raw(b'\xa5' * 100)) * N_PKTS
-        p_spoof_strict = (Ether(dst=self.pg0.local_mac,
-                                src=self.pg0.remote_mac) /
-                          IPv6(src=self.pg2.remote_ip6,
-                               dst=self.pg1.remote_ip6) /
-                          UDP(sport=1236, dport=1236) /
-                          Raw(b'\xa5' * 100)) * N_PKTS
-        p_good = (Ether(dst=self.pg0.local_mac,
-                        src=self.pg0.remote_mac) /
-                  IPv6(src=self.pg0.remote_ip6,
-                       dst=self.pg1.remote_ip6) /
-                  UDP(sport=1236, dport=1236) /
-                  Raw(b'\xa5' * 100)) * N_PKTS
+        p_spoof_loose = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src="3::3", dst=self.pg1.remote_ip6)
+            / UDP(sport=1236, dport=1236)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
+        p_spoof_strict = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg2.remote_ip6, dst=self.pg1.remote_ip6)
+            / UDP(sport=1236, dport=1236)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
+        p_good = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6)
+            / UDP(sport=1236, dport=1236)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
 
         #
         # before adding the uRPF, ensure all packets are forwarded
@@ -205,10 +214,12 @@
         #
         # apply loose uRPF check on pg0 rx
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         # good packets still pass
         self.send_and_expect(self.pg0, p_good, self.pg1)
@@ -217,16 +228,17 @@
         # packets from address to which there is no route are dropped
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip6-rx-urpf-loose/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip6-rx-urpf-loose/uRPF Drop", N_PKTS)
 
         #
         # crank it up to strict mode
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         # good packets still pass
         self.send_and_expect(self.pg0, p_good, self.pg1)
@@ -234,16 +246,17 @@
         self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip6-rx-urpf-strict/uRPF Drop",
-                                        2 * N_PKTS)
+        self.assert_error_counter_equal("/err/ip6-rx-urpf-strict/uRPF Drop", 2 * N_PKTS)
 
         #
         # disable uRPF, all traffic should pass
         #
-        self.vapi.urpf_update(is_input=True,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg0.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=True,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg0.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
@@ -256,22 +269,25 @@
         #  for strict they should not be forwarded if they would be
         #  forwarded thru that interface.
         #
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip6-tx-urpf-loose/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip6-tx-urpf-loose/uRPF Drop", N_PKTS)
 
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
         self.send_and_expect(self.pg0, p_good, self.pg1)
         # the strict packet, from a peer is allowed, since it does
@@ -279,27 +295,27 @@
         self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
         self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
 
-        self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop",
-                                        N_PKTS)
+        self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop", N_PKTS)
 
         # change the strict packet so that it would forward through pg1
-        p_spoof_strict = (Ether(dst=self.pg0.local_mac,
-                                src=self.pg0.remote_mac) /
-                          IPv6(src=self.pg1.remote_ip6,
-                               dst=self.pg1.remote_ip6) /
-                          UDP(sport=1236, dport=1236) /
-                          Raw(b'\xa5' * 100)) * N_PKTS
+        p_spoof_strict = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg1.remote_ip6)
+            / UDP(sport=1236, dport=1236)
+            / Raw(b"\xa5" * 100)
+        ) * N_PKTS
 
         self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
-        self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop",
-                                        2 * N_PKTS)
+        self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop", 2 * N_PKTS)
 
         # cleanup
-        self.vapi.urpf_update(is_input=False,
-                              mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
-                              af=e.vl_api_address_family_t.ADDRESS_IP6,
-                              sw_if_index=self.pg1.sw_if_index)
+        self.vapi.urpf_update(
+            is_input=False,
+            mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
+            af=e.vl_api_address_family_t.ADDRESS_IP6,
+            sw_if_index=self.pg1.sw_if_index,
+        )
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main(testRunner=VppTestRunner)