diff --git a/src/sonic-config-engine/minigraph.py b/src/sonic-config-engine/minigraph.py
index 6553055b84c3..ac0f4922f94f 100644
--- a/src/sonic-config-engine/minigraph.py
+++ b/src/sonic-config-engine/minigraph.py
@@ -251,7 +251,7 @@ def parse_dpg(dpg, hname):
                     # Erspan session will be attached to all front panel ports,
                     # if panel ports is a member port of LAG, should add the LAG 
                     # to acl table instead of the panel ports
-                    acl_intfs = pc_intfs
+                    acl_intfs = pc_intfs[:]
                     for panel_port in port_alias_map.values():
                         if panel_port not in intfs_inpc:
                             acl_intfs.append(panel_port)
diff --git a/src/sonic-config-engine/tests/test_cfggen.py b/src/sonic-config-engine/tests/test_cfggen.py
index 1755468300d5..4833530fb466 100644
--- a/src/sonic-config-engine/tests/test_cfggen.py
+++ b/src/sonic-config-engine/tests/test_cfggen.py
@@ -83,11 +83,11 @@ def test_minigraph_acl(self):
                                          "Warning: ignore interface 'fortyGigE0/2' in DEVICE_NEIGHBOR as it is not in the port_config.ini\n"
                                          "{'DATAACL': {'type': 'L3', 'policy_desc': 'DATAACL', 'ports': ['PortChannel01', 'PortChannel02', 'PortChannel03', 'PortChannel04']}, "
                                          "'NTP_ACL': {'services': ['NTP'], 'type': 'CTRLPLANE', 'policy_desc': 'NTP_ACL'}, "
-                                         "'EVERFLOW': {'type': 'MIRROR', 'policy_desc': 'EVERFLOW', 'ports': ['PortChannel01', 'PortChannel02', 'PortChannel03', 'PortChannel04', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100']}, "
+                                         "'EVERFLOW': {'type': 'MIRROR', 'policy_desc': 'EVERFLOW', 'ports': ['PortChannel01', 'PortChannel02', 'PortChannel03', 'PortChannel04', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100']}, "
                                          "'ROUTER_PROTECT': {'services': ['SSH', 'SNMP'], 'type': 'CTRLPLANE', 'policy_desc': 'ROUTER_PROTECT'}, "
                                          "'SNMP_ACL': {'services': ['SNMP'], 'type': 'CTRLPLANE', 'policy_desc': 'SNMP_ACL'}, "
                                          "'SSH_ACL': {'services': ['SSH'], 'type': 'CTRLPLANE', 'policy_desc': 'SSH_ACL'}, "
-                                         "'EVERFLOWV6': {'type': 'MIRROR', 'policy_desc': 'EVERFLOWV6', 'ports': ['PortChannel01', 'PortChannel02', 'PortChannel03', 'PortChannel04', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100']}}")
+                                         "'EVERFLOWV6': {'type': 'MIRROR', 'policy_desc': 'EVERFLOWV6', 'ports': ['PortChannel01', 'PortChannel02', 'PortChannel03', 'PortChannel04', 'Ethernet24', 'Ethernet40', 'Ethernet20', 'Ethernet44', 'Ethernet48', 'Ethernet28', 'Ethernet96', 'Ethernet92', 'Ethernet76', 'Ethernet72', 'Ethernet52', 'Ethernet80', 'Ethernet56', 'Ethernet32', 'Ethernet16', 'Ethernet36', 'Ethernet12', 'Ethernet60', 'Ethernet8', 'Ethernet4', 'Ethernet0', 'Ethernet64', 'Ethernet68', 'Ethernet84', 'Ethernet88', 'Ethernet108', 'Ethernet104', 'Ethernet100']}}")
 
     def test_minigraph_everflow(self):
         argument = '-m "' + self.sample_graph_t0 + '" -p "' + self.port_config + '" -v MIRROR_SESSION'