diff --git a/ansible/roles/test/files/ptftests/dhcpv6_counter_test.py b/ansible/roles/test/files/ptftests/dhcpv6_counter_test.py
index 9f204997998..73b82a67fec 100644
--- a/ansible/roles/test/files/ptftests/dhcpv6_counter_test.py
+++ b/ansible/roles/test/files/ptftests/dhcpv6_counter_test.py
@@ -1,4 +1,6 @@
+import os
 import ast
+import time
 import subprocess
 
 # Packet Test Framework imports
@@ -56,6 +58,7 @@ def setUp(self):
         self.server_ip = self.test_params['server_ip']
         self.relay_iface_ip = self.test_params['relay_iface_ip']
         self.relay_iface_mac = self.test_params['relay_iface_mac']
+        self.dut_mac = self.test_params['dut_mac']
         self.vlan_ip = self.test_params['vlan_ip']
         self.client_mac = self.dataplane.get_mac(0, self.client_port_index)
 
@@ -93,7 +96,7 @@ def create_packet(self, message):
         return packet
 
     def create_server_packet(self, message):
-        packet = Ether(dst=self.relay_iface_mac)
+        packet = Ether(dst=self.dut_mac)
         packet /= IPv6(src=self.server_ip, dst=self.relay_iface_ip)
         packet /= UDP(sport=self.DHCP_SERVER_PORT, dport=self.DHCP_SERVER_PORT)
         packet /= DHCP6_RelayReply(msgtype=13, linkaddr=self.vlan_ip, peeraddr=self.client_link_local)
@@ -112,6 +115,9 @@ def client_send(self):
         for message in client_messages:
             packet = self.create_packet(message)
             testutils.send_packet(self, self.client_port_index, packet)
+            # sleep a short time to low down packet sending rate in case multicast packets
+            # flooding cause packets drop on dhcpv6 relay filter raw socket
+            time.sleep(1)
 
     def server_send(self):
         server_messages = [DHCP6_Advertise, DHCP6_Reply]
@@ -119,6 +125,7 @@ def server_send(self):
             packet = self.create_server_packet(message)
             packet.src = self.dataplane.get_mac(0, self.server_port_indices[0])
             testutils.send_packet(self, self.server_port_indices[0], packet)
+            time.sleep(1)
 
     def runTest(self):
         self.client_send()
diff --git a/tests/dhcp_relay/test_dhcpv6_relay.py b/tests/dhcp_relay/test_dhcpv6_relay.py
index 7baa74c2490..1d911f50c7d 100644
--- a/tests/dhcp_relay/test_dhcpv6_relay.py
+++ b/tests/dhcp_relay/test_dhcpv6_relay.py
@@ -13,6 +13,8 @@
 from tests.common.platform.processes_utils import wait_critical_processes
 from tests.common.utilities import wait_until
 from tests.common.helpers.assertions import pytest_assert
+from tests.common.dualtor.mux_simulator_control import toggle_all_simulator_ports_to_rand_selected_tor_m  # noqa F401
+
 
 pytestmark = [
     pytest.mark.topology('t0', 'm0'),
@@ -24,6 +26,14 @@
 
 logger = logging.getLogger(__name__)
 
+
+def wait_all_bgp_up(duthost):
+    config_facts = duthost.config_facts(host=duthost.hostname, source="running")['ansible_facts']
+    bgp_neighbors = config_facts.get('BGP_NEIGHBOR', {})
+    if not wait_until(60, 10, 0, duthost.check_bgp_session_state, bgp_neighbors.keys()):
+        pytest.fail("not all bgp sessions are up after config change")
+
+
 @pytest.fixture(scope="module", params=[SINGLE_TOR_MODE, DUAL_TOR_MODE])
 def testing_config(request, duthosts, rand_one_dut_hostname, tbinfo):
     testing_mode = request.param
@@ -160,7 +170,8 @@ def test_interface_binding(duthosts, rand_one_dut_hostname, dut_dhcp_relay_data)
     for dhcp_relay in dut_dhcp_relay_data:
         assert ("*:{}".format(dhcp_relay['downlink_vlan_iface']['name']) or "*:*" in output, "{} is not found in {}".format("*:{}".format(dhcp_relay['downlink_vlan_iface']['name']), output)) or ("*:*" in output, "dhcp6relay socket is not properly binded")
 
-def test_dhcpv6_relay_counter(ptfhost, duthosts, rand_one_dut_hostname, dut_dhcp_relay_data):
+def test_dhcpv6_relay_counter(ptfhost, duthosts, rand_one_dut_hostname, dut_dhcp_relay_data,
+                              toggle_all_simulator_ports_to_rand_selected_tor_m):  # noqa F811
     """ Test DHCPv6 Counter """
     duthost = duthosts[rand_one_dut_hostname]
     skip_release(duthost, ["201911", "202106"])
@@ -185,6 +196,7 @@ def test_dhcpv6_relay_counter(ptfhost, duthosts, rand_one_dut_hostname, dut_dhcp
                            "server_ip": str(dhcp_relay['downlink_vlan_iface']['dhcpv6_server_addrs'][0]),
                            "relay_iface_ip": str(dhcp_relay['downlink_vlan_iface']['addr']),
                            "relay_iface_mac": str(dhcp_relay['downlink_vlan_iface']['mac']),
+                           "dut_mac": str(dhcp_relay['uplink_mac']),
                            "relay_link_local": str(dhcp_relay['uplink_interface_link_local']),
                            "vlan_ip": str(dhcp_relay['downlink_vlan_iface']['addr'])},
                    log_file="/tmp/dhcpv6_relay_test.DHCPCounterTest.log")
@@ -247,7 +259,7 @@ def test_dhcp_relay_after_link_flap(ptfhost, duthosts, rand_one_dut_hostname, du
             duthost.shell('ifconfig {} up'.format(iface))
 
         # Sleep a bit to ensure uplinks are up
-        time.sleep(20)
+        wait_all_bgp_up(duthost)
 
         # Run the DHCP relay test on the PTF host
         ptf_runner(ptfhost,
@@ -302,7 +314,7 @@ def test_dhcp_relay_start_with_uplinks_down(ptfhost, duthosts, rand_one_dut_host
             duthost.shell('ifconfig {} up'.format(iface))
 
         # Sleep a bit to ensure uplinks are up
-        time.sleep(20)
+        wait_all_bgp_up(duthost)
 
         # Run the DHCP relay test on the PTF host
         ptf_runner(ptfhost,