diff --git a/src/sonic-config-engine/minigraph.py b/src/sonic-config-engine/minigraph.py
index 570f5de2418..4ac7e9d68c9 100644
--- a/src/sonic-config-engine/minigraph.py
+++ b/src/sonic-config-engine/minigraph.py
@@ -62,6 +62,7 @@ def parse_png(png, hname):
     console_port = ''
     mgmt_dev = ''
     mgmt_port = ''
+    port_speeds = {}
     for child in png:
         if child.tag == str(QName(ns, "DeviceInterfaceLinks")):
             for link in child.findall(str(QName(ns, "DeviceLinkBase"))):
@@ -73,15 +74,21 @@ def parse_png(png, hname):
                 endport = link.find(str(QName(ns, "EndPort"))).text
                 startdevice = link.find(str(QName(ns, "StartDevice"))).text
                 startport = link.find(str(QName(ns, "StartPort"))).text
+                bandwidth_node = link.find(str(QName(ns, "Bandwidth")))
+                bandwidth = bandwidth_node.text if bandwidth_node is not None else None
 
                 if enddevice == hname:
                     if port_alias_map.has_key(endport):
                         endport = port_alias_map[endport]
                     neighbors[endport] = {'name': startdevice, 'port': startport}
+                    if bandwidth:
+                        port_speeds[endport] = bandwidth
                 else:
                     if port_alias_map.has_key(startport):
                         startport = port_alias_map[startport]
                     neighbors[startport] = {'name': enddevice, 'port': endport}
+                    if bandwidth:
+                        port_speeds[startport] = bandwidth
 
         if child.tag == str(QName(ns, "Devices")):
             for device in child.findall(str(QName(ns, "Device"))):
@@ -106,7 +113,7 @@ def parse_png(png, hname):
                             elif node.tag == str(QName(ns, "EndDevice")):
                                 mgmt_dev = node.text
 
-    return (neighbors, devices, console_dev, console_port, mgmt_dev, mgmt_port)
+    return (neighbors, devices, console_dev, console_port, mgmt_dev, mgmt_port, port_speeds)
 
 
 def parse_dpg(dpg, hname):
@@ -368,7 +375,8 @@ def parse_xml(filename, platform=None, port_config_file=None):
     neighbors = None
     devices = None
     hostname = None
-    port_speeds = {}
+    port_speeds_default = {}
+    port_speed_png = {}
     port_descriptions = {}
     syslog_servers = []
     dhcp_servers = []
@@ -395,13 +403,13 @@ def parse_xml(filename, platform=None, port_config_file=None):
         elif child.tag == str(QName(ns, "CpgDec")):
             (bgp_sessions, bgp_asn, bgp_peers_with_range) = parse_cpg(child, hostname)
         elif child.tag == str(QName(ns, "PngDec")):
-            (neighbors, devices, console_dev, console_port, mgmt_dev, mgmt_port) = parse_png(child, hostname)
+            (neighbors, devices, console_dev, console_port, mgmt_dev, mgmt_port, port_speed_png) = parse_png(child, hostname)
         elif child.tag == str(QName(ns, "UngDec")):
-            (u_neighbors, u_devices, _, _, _, _) = parse_png(child, hostname)
+            (u_neighbors, u_devices, _, _, _, _, _) = parse_png(child, hostname)
         elif child.tag == str(QName(ns, "MetadataDeclaration")):
             (syslog_servers, dhcp_servers, ntp_servers, tacacs_servers, mgmt_routes, erspan_dst, deployment_id) = parse_meta(child, hostname)
         elif child.tag == str(QName(ns, "DeviceInfos")):
-            (port_speeds, port_descriptions) = parse_deviceinfo(child, hwsku)
+            (port_speeds_default, port_descriptions) = parse_deviceinfo(child, hwsku)
 
     results = {}
     results['DEVICE_METADATA'] = {'localhost': {
@@ -438,14 +446,23 @@ def parse_xml(filename, platform=None, port_config_file=None):
     results['VLAN_INTERFACE'] = vlan_intfs
     results['PORTCHANNEL_INTERFACE'] = pc_intfs
 
-    for port_name in port_speeds:
+    for port_name in port_speeds_default:
         # ignore port not in port_config.ini
         if not ports.has_key(port_name):
             continue
 
-        ports.setdefault(port_name, {})['speed'] = port_speeds[port_name]
-        if port_speeds[port_name] == '100000':
-            ports.setdefault(port_name, {})['fec'] = 'rs'
+        ports.setdefault(port_name, {})['speed'] = port_speeds_default[port_name]
+
+    for port_name in port_speed_png:
+        # if port_name is not in port_config.ini, still consider it.
+        # and later swss will pick up and behave on-demand port break-up.
+        # if on-deman port break-up is not supported on a specific platform, swss will return error.
+        ports.setdefault(port_name, {})['speed'] = port_speed_png[port_name]
+
+    for port_name, port in ports.items():
+        if port.get('speed') == '100000':
+            port['fec'] = 'rs'
+
     for port_name in port_descriptions:
         # ignore port not in port_config.ini
         if not ports.has_key(port_name):
diff --git a/src/sonic-config-engine/tests/sample_output/ports.json b/src/sonic-config-engine/tests/sample_output/ports.json
index 7533fb7377e..3fa2e29a8b0 100644
--- a/src/sonic-config-engine/tests/sample_output/ports.json
+++ b/src/sonic-config-engine/tests/sample_output/ports.json
@@ -1,7 +1,7 @@
 [
     {
         "PORT_TABLE:Ethernet8": {
-            "speed": "40000",
+            "speed": "1000",
             "description": "Interface description"
         },
         "OP": "SET"
diff --git a/src/sonic-config-engine/tests/simple-sample-graph.xml b/src/sonic-config-engine/tests/simple-sample-graph.xml
index 33e8a6d616d..6e351e1cd00 100644
--- a/src/sonic-config-engine/tests/simple-sample-graph.xml
+++ b/src/sonic-config-engine/tests/simple-sample-graph.xml
@@ -181,7 +181,19 @@
     </DeviceDataPlaneInfo>
   </DpgDec>
   <PngDec>
-    <DeviceInterfaceLinks/>
+    <DeviceInterfaceLinks>
+      <DeviceLinkBase i:type="DeviceInterfaceLink">
+        <ElementType>DeviceInterfaceLink</ElementType>
+        <AutoNegotiation>true</AutoNegotiation>
+        <Bandwidth>1000</Bandwidth>
+        <EndDevice>ARISTA01T1</EndDevice>
+        <EndPort>et1</EndPort>
+        <FlowControl>true</FlowControl>
+        <StartDevice>switch-t0</StartDevice>
+        <StartPort>fortyGigE0/8</StartPort>
+        <Validate>true</Validate>
+      </DeviceLinkBase>
+    </DeviceInterfaceLinks>
     <Devices>
       <Device i:type="ToRRouter">
         <Hostname>switch-t0</Hostname>
diff --git a/src/sonic-config-engine/tests/test_cfggen.py b/src/sonic-config-engine/tests/test_cfggen.py
index fbec671aff5..901b882f704 100644
--- a/src/sonic-config-engine/tests/test_cfggen.py
+++ b/src/sonic-config-engine/tests/test_cfggen.py
@@ -148,7 +148,7 @@ def test_minigraph_deployment_id(self):
     def test_minigraph_ethernet_interfaces(self):
         argument = '-m "' + self.sample_graph_simple + '" -p "' + self.port_config + '" -v "PORT[\'Ethernet8\']"'
         output = self.run_script(argument)
-        self.assertEqual(output.strip(), "{'alias': 'fortyGigE0/8', 'lanes': '37,38,39,40', 'description': 'Interface description', 'speed': '40000'}")
+        self.assertEqual(output.strip(), "{'alias': 'fortyGigE0/8', 'lanes': '37,38,39,40', 'description': 'Interface description', 'speed': '1000'}")
         argument = '-m "' + self.sample_graph_simple + '" -p "' + self.port_config + '" -v "PORT[\'Ethernet12\']"'
         output = self.run_script(argument)
         self.assertEqual(output.strip(), "{'alias': 'fortyGigE0/12', 'lanes': '33,34,35,36', 'fec': 'rs', 'speed': '100000', 'description': 'Interface description'}")
@@ -157,7 +157,7 @@ def test_minigraph_extra_ethernet_interfaces(self):
         argument = '-m "' + self.sample_graph_simple + '" -p "' + self.port_config + '" -v "PORT"'
         output = self.run_script(argument)
         self.assertEqual(output.strip(), \
-                "{'Ethernet8': {'alias': 'fortyGigE0/8', 'lanes': '37,38,39,40', 'description': 'Interface description', 'speed': '40000'}, "
+                "{'Ethernet8': {'alias': 'fortyGigE0/8', 'lanes': '37,38,39,40', 'description': 'Interface description', 'speed': '1000'}, "
                 "'Ethernet0': {'alias': 'fortyGigE0/0', 'lanes': '29,30,31,32', 'speed': '10000'}, "
                 "'Ethernet4': {'alias': 'fortyGigE0/4', 'lanes': '25,26,27,28', 'speed': '25000'}, "
                 "'Ethernet108': {'alias': 'fortyGigE0/108', 'lanes': '81,82,83,84'}, "