diff --git a/ansible/config_sonic_basedon_testbed.yml b/ansible/config_sonic_basedon_testbed.yml
index 94ff94e8b80..d0b204bf185 100644
--- a/ansible/config_sonic_basedon_testbed.yml
+++ b/ansible/config_sonic_basedon_testbed.yml
@@ -61,14 +61,34 @@
     connection: local
   
   - block:
+      - name: get platform info
+        shell: show platform summary | grep 'Platform' | awk '{print $2}'
+        register: platform_name
+        become: yes
+
+      - name: platform_name
+        debug: var=platform_name.stdout
+
+      - name: get image info
+        shell: ls /host/ | grep 'image'
+        register: image_name
+        become: yes
+
+      - name: image_name
+        debug: var=image_name.stdout
+
       - name: saved original minigraph file (if original file may don't exist, then ignore errors)
-        shell: mv /etc/sonic/minigraph.xml /etc/sonic/minigraph.xml.orig
+        shell: mv /usr/share/sonic/device/{{ platform_name.stdout }}/minigraph.xml /usr/share/sonic/device/{{ platform_name.stdout }}/minigraph.xml.orig
         become: true
         ignore_errors: true
 
       - name: create minigraph file for SONiC device
         template: src=templates/topo/{{ template_name }}.j2
-                  dest=/etc/sonic/minigraph.xml
+                  dest=/usr/share/sonic/device/{{ platform_name.stdout }}/minigraph.xml
+        become: true
+
+      - name: set the status of dut as first time configuration
+        shell: touch /host/{{ image_name.stdout }}/platform/firsttime
         become: true
  
       - name: disable automatic minigraph update if we are deploying new minigraph into SONiC
diff --git a/ansible/roles/test/files/ptftests/IP_decap_test.py b/ansible/roles/test/files/ptftests/IP_decap_test.py
index 274526e88ff..dd91dfe4e7e 100644
--- a/ansible/roles/test/files/ptftests/IP_decap_test.py
+++ b/ansible/roles/test/files/ptftests/IP_decap_test.py
@@ -142,6 +142,9 @@ def runTest(self):
         """
         # IPv4 Test
         for ip_range in self.fib.ipv4_ranges():
+            # add this to skip default route 0.0.0.0/0
+            if str(ip_range.get_first_ip()) == "0.0.0.0":
+                continue
             # Get the expected list of ports that would receive the packets
             exp_port_list = self.fib[ip_range.get_first_ip()].get_next_hop_list()
             # Choose random one source port from all ports excluding the expected ones
diff --git a/ansible/roles/test/files/ptftests/fib.py b/ansible/roles/test/files/ptftests/fib.py
index d4dc005f9e5..bd9624dc6f8 100644
--- a/ansible/roles/test/files/ptftests/fib.py
+++ b/ansible/roles/test/files/ptftests/fib.py
@@ -44,12 +44,15 @@ def get_next_hop_list(self):
     # Initialize FIB with FIB file
     def __init__(self, file_path):
         self._ipv4_lpm_dict = LpmDict()
-        for ip in EXCLUDE_IPV4_PREFIXES:
-            self._ipv4_lpm_dict[ip] = self.NextHop()
+        # no need to add EXCLUDE_IPV4_PREFIXES into test
+        # for ip in EXCLUDE_IPV4_PREFIXES:
+        #     os.system("echo NH: " + str(ip) + " >> ~/ip_decap.txt")
+        #     self._ipv4_lpm_dict[ip] = self.NextHop()
 
         self._ipv6_lpm_dict = LpmDict(ipv4=False)
-        for ip in EXCLUDE_IPV6_PREFIXES:
-            self._ipv6_lpm_dict[ip] = self.NextHop()
+        # no need to add EXCLUDE_IPV^_PREFIXES into test
+        # for ip in EXCLUDE_IPV6_PREFIXES:
+        #     self._ipv6_lpm_dict[ip] = self.NextHop()
 
         with open(file_path, 'r') as f:
             for line in f.readlines():
diff --git a/ansible/roles/test/files/ptftests/lpm.py b/ansible/roles/test/files/ptftests/lpm.py
index f30fdcef4e9..56feac56ac9 100644
--- a/ansible/roles/test/files/ptftests/lpm.py
+++ b/ansible/roles/test/files/ptftests/lpm.py
@@ -1,5 +1,4 @@
 import random
-
 from ipaddress import ip_address, ip_network
 from SubnetTree import SubnetTree
 
@@ -101,5 +100,7 @@ def ranges(self):
                     interval = self.IpInterval(sorted_boundaries[index], ip_address(u'255.255.255.255'))
                 else:
                     interval = self.IpInterval(sorted_boundaries[index], ip_address(u'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'))
-            ranges.append(interval)
+            # add this to prevent incorrect intervals generated by IpInterval
+            if index % 2 == 1:
+                ranges.append(interval)
         return ranges