diff --git a/ansible/roles/test/files/ptftests/fib_test.py b/ansible/roles/test/files/ptftests/fib_test.py
index 5f11b96a9ff..a52199d8e5b 100644
--- a/ansible/roles/test/files/ptftests/fib_test.py
+++ b/ansible/roles/test/files/ptftests/fib_test.py
@@ -100,6 +100,8 @@ def setUp(self):
             self.src_ports = [0, 1, 4, 5, 16, 17, 20, 21, 34, 36, 37, 38, 39, 42, 44, 45, 46, 47, 50, 52, 53, 54, 55, 58, 60, 61, 62, 63]
         if self.test_params['testbed_type'] == 't0':
             self.src_ports = range(1, 25) + range(28, 32)
+        if self.test_params['testbed_type'] == 't0-56':
+            self.src_ports = [0, 1, 4, 5, 8, 9] + range(12, 18) + [20, 21, 24, 25, 28, 29, 32, 33, 36, 37] + range(40, 46) + [48, 49, 52, 53]
         if self.test_params['testbed_type'] == 't0-64':
             self.src_ports = range(0, 2) + range(4, 18) + range(20, 33) + range(36, 43) + range(48, 49) + range(52, 59)
         if self.test_params['testbed_type'] == 't0-116':
diff --git a/ansible/roles/test/tasks/bgp_speaker.yml b/ansible/roles/test/tasks/bgp_speaker.yml
index 3b321ec0443..7ae0717e7b8 100644
--- a/ansible/roles/test/tasks/bgp_speaker.yml
+++ b/ansible/roles/test/tasks/bgp_speaker.yml
@@ -7,7 +7,7 @@
       when: (testbed_type is not defined or ptf_host is not defined)
 
     - fail: msg="Invalid testbed_type value '{{testbed_type}}'"
-      when: testbed_type not in ['t0', 't0-64', 't0-116']
+      when: testbed_type not in testcases['bgp_speaker']['topologies']
 
     - name: Gather minigraph facts about the device
       minigraph_facts: host={{inventory_hostname}}
diff --git a/ansible/roles/test/tasks/shared-fib.yml b/ansible/roles/test/tasks/shared-fib.yml
index a7739620a76..6c6d5e46b40 100644
--- a/ansible/roles/test/tasks/shared-fib.yml
+++ b/ansible/roles/test/tasks/shared-fib.yml
@@ -8,7 +8,7 @@
   when: testbed_type is not defined
 
 - fail: msg="testbed_type {{testbed_type}} is invalid."
-  when: testbed_type not in ['t1-lag', 't1', 't1-64-lag', 't0', 't0-64', 't0-116']
+  when: testbed_type not in testcases['fib']['topologies']
 
 - include_vars: "vars/topo_{{testbed_type}}.yml"
 
@@ -18,7 +18,7 @@
 
 - name: Expand properties into props
   set_fact: props="{{configuration_properties['common']}}"
-  when: testbed_type in ['t0', 't0-64', 't0-116']
+  when: testbed_type in ['t0', 't0-56', 't0-64', 't0-116']
 
 - name: Expand ToR properties into props
   set_fact: props_tor="{{configuration_properties['tor']}}"
diff --git a/ansible/roles/test/vars/testcases.yml b/ansible/roles/test/vars/testcases.yml
index 21b2ccfedeb..42879ea6462 100644
--- a/ansible/roles/test/vars/testcases.yml
+++ b/ansible/roles/test/vars/testcases.yml
@@ -26,7 +26,7 @@ testcases:
 
     bgp_speaker:
       filename: bgp_speaker.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116]
       required_vars:
           ptf_host:
           testbed_type:
@@ -37,7 +37,7 @@ testcases:
 
     continuous_reboot:
       filename: continuous_reboot.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag]
 
     copp:
       filename: copp.yml
@@ -47,7 +47,7 @@ testcases:
 
     decap:
       filename: decap.yml
-      topologies: [t1, t1-lag, t1-64-lag, t0, t0-64, t0-116]
+      topologies: [t1, t1-lag, t1-64-lag, t0, t0-56, t0-64, t0-116]
       required_vars:
           ptf_host:
           testbed_type:
@@ -55,7 +55,7 @@ testcases:
 
     dhcp_relay:
       filename: dhcp_relay.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116]
       required_vars:
           ptf_host:
 
@@ -72,7 +72,7 @@ testcases:
 
     fast-reboot:
       filename: fast-reboot.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116]
       required_vars:
           ptf_host:
           vm_hosts:
@@ -86,7 +86,7 @@ testcases:
 
     fib:
       filename: simple-fib.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag]
       required_vars:
           ptf_host:
           testbed_type:
@@ -100,36 +100,36 @@ testcases:
 
     fdb:
       filename: fdb.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116]
       required_vars:
           ptf_host:
           testbed_type:
 
     dir_bcast:
       filename: dir_bcast.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116]
       required_vars:
           ptf_host:
           testbed_type:
 
     lag_2:
       filename: lag_2.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1-lag, t1-64-lag]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1-lag, t1-64-lag]
       required_vars:
           ptf_host:
           testbed_type:
 
     lldp:
       filename: lldp.yml
-      topologies: [t0, t0-16, t0-64, t0-116, t0-64-32, t1, t1-lag, t1-64-lag]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-116, t0-64-32, t1, t1-lag, t1-64-lag]
 
     link_flap:
       filename: link_flap.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     mem_check:
       filename: mem_check.yml
-      topologies: [t0, t0-16, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-16, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     mtu:
       filename: mtu.yml
@@ -150,11 +150,11 @@ testcases:
 
     ntp:
       filename: ntp.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     pfc_wd:
       filename: pfc_wd.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     port_toggle:
       filename: port_toggle.yml
@@ -166,7 +166,7 @@ testcases:
 
     reboot:
       filename: reboot.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     repeat_harness:
       filename: repeat_harness.yml
@@ -186,19 +186,19 @@ testcases:
 
     sensors:
       filename: sensors_check.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     service_acl:
       filename: service_acl.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     snmp:
       filename: snmp.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     syslog:
       filename: syslog.yml
-      topologies: [t0, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
+      topologies: [t0, t0-56, t0-64, t0-64-32, t0-116, t1, t1-lag, t1-64-lag, ptf32, ptf64]
 
     vlan:
       filename: vlantb.yml