diff --git a/rw_core/coreIf/device_manager_if.go b/rw_core/coreIf/device_manager_if.go
index c8e33c1..dbe5598 100644
--- a/rw_core/coreIf/device_manager_if.go
+++ b/rw_core/coreIf/device_manager_if.go
@@ -24,4 +24,5 @@
 // DeviceManager represents a generic device manager
 type DeviceManager interface {
 	GetDevice(string) (*voltha.Device, error)
+	IsRootDevice(string) (bool, error)
 }
diff --git a/rw_core/coreIf/logical_device_agent_if.go b/rw_core/coreIf/logical_device_agent_if.go
index b5893ec..43bbf18 100644
--- a/rw_core/coreIf/logical_device_agent_if.go
+++ b/rw_core/coreIf/logical_device_agent_if.go
@@ -27,9 +27,9 @@
 
 // LogicalAgent represents a generic agent
 type LogicalDeviceAgent interface {
-	GetLogicalDevice() *voltha.LogicalDevice
+	GetLogicalDevice() (*voltha.LogicalDevice, error)
 	GetDeviceGraph() *graph.DeviceGraph
 	GetAllDefaultRules() *utils.DeviceRules
 	GetWildcardInputPorts(excludePort ...uint32) []uint32
-	GetRoute(ingressPortNo *uint32, egressPortNo *uint32) []graph.RouteHop
+	GetRoute(ingressPortNo uint32, egressPortNo uint32) []graph.RouteHop
 }