diff --git a/api/bbsim/bbsim.pb.go b/api/bbsim/bbsim.pb.go
index a4b6f11..e9b3f56 100644
--- a/api/bbsim/bbsim.pb.go
+++ b/api/bbsim/bbsim.pb.go
@@ -1100,6 +1100,7 @@
 type IgmpRequest struct {
 	OnuReq               *ONURequest    `protobuf:"bytes,1,opt,name=OnuReq,proto3" json:"OnuReq,omitempty"`
 	SubActionVal         SubActionTypes `protobuf:"varint,2,opt,name=SubActionVal,proto3,enum=bbsim.SubActionTypes" json:"SubActionVal,omitempty"`
+	GroupAddress         string         `protobuf:"bytes,3,opt,name=GroupAddress,proto3" json:"GroupAddress,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
 	XXX_unrecognized     []byte         `json:"-"`
 	XXX_sizecache        int32          `json:"-"`
@@ -1144,6 +1145,13 @@
 	return SubActionTypes_JOIN
 }
 
+func (m *IgmpRequest) GetGroupAddress() string {
+	if m != nil {
+		return m.GroupAddress
+	}
+	return ""
+}
+
 type Flows struct {
 	FlowCount            uint32          `protobuf:"varint,1,opt,name=flow_count,json=flowCount,proto3" json:"flow_count,omitempty"`
 	Flows                []*openolt.Flow `protobuf:"bytes,2,rep,name=flows,proto3" json:"flows,omitempty"`
@@ -1290,105 +1298,106 @@
 func init() { proto.RegisterFile("api/bbsim/bbsim.proto", fileDescriptor_ef7750073d18011b) }
 
 var fileDescriptor_ef7750073d18011b = []byte{
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+	0x5d, 0xd2, 0x8a, 0x0f, 0x0e, 0xf1, 0x0d, 0x34, 0x85, 0xce, 0x83, 0x23, 0x7c, 0x0b, 0xd2, 0xc2,
+	0xcd, 0x67, 0x05, 0xf8, 0x35, 0xac, 0x8b, 0xbe, 0xe1, 0x8f, 0xe8, 0x87, 0x85, 0x78, 0x08, 0x75,
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+	0x9e, 0x8c, 0x1c, 0x3a, 0x69, 0xd0, 0xf6, 0x42, 0x3d, 0xbd, 0x08, 0xff, 0xc2, 0x86, 0x1b, 0xdd,
+	0x6b, 0x23, 0xbb, 0x4c, 0x57, 0xd9, 0x78, 0x05, 0xd5, 0x1e, 0x89, 0xf8, 0x7c, 0x5d, 0x11, 0x79,
+	0x5c, 0x6c, 0x26, 0xc0, 0x6a, 0xbb, 0xd1, 0xb9, 0x72, 0xbc, 0x4b, 0x42, 0x57, 0x05, 0x7f, 0xaf,
+	0x23, 0x21, 0x92, 0x5a, 0x1e, 0xab, 0x1c, 0x9d, 0xc0, 0x13, 0xde, 0xd8, 0xcb, 0x6f, 0xf7, 0x15,
+	0x7e, 0x9f, 0x2e, 0xa0, 0x25, 0x79, 0x39, 0x77, 0x5e, 0x66, 0x7f, 0xed, 0x0f, 0xff, 0x0c, 0x00,
+	0x00, 0xff, 0xff, 0x96, 0xa7, 0x23, 0x49, 0x39, 0x10, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1443,7 +1452,7 @@
 	PoweronONUsOnPON(ctx context.Context, in *PONRequest, opts ...grpc.CallOption) (*Response, error)
 	// Restart EAPOL for ONU
 	RestartEapol(ctx context.Context, in *ONURequest, opts ...grpc.CallOption) (*Response, error)
-	// Resatrt DHCP for ONU
+	// Restart DHCP for ONU
 	RestartDhcp(ctx context.Context, in *ONURequest, opts ...grpc.CallOption) (*Response, error)
 	// Send ONU alarm indication
 	SetOnuAlarmIndication(ctx context.Context, in *ONUAlarmRequest, opts ...grpc.CallOption) (*Response, error)
@@ -1451,7 +1460,7 @@
 	SetOltAlarmIndication(ctx context.Context, in *OLTAlarmRequest, opts ...grpc.CallOption) (*Response, error)
 	// Get all flows or ONU specific flows
 	GetFlows(ctx context.Context, in *ONURequest, opts ...grpc.CallOption) (*Flows, error)
-	// Chnage IGMP state
+	// Change IGMP state
 	ChangeIgmpState(ctx context.Context, in *IgmpRequest, opts ...grpc.CallOption) (*Response, error)
 	// Get Traffic scheduler information for ONU
 	GetOnuTrafficSchedulers(ctx context.Context, in *ONURequest, opts ...grpc.CallOption) (*ONUTrafficSchedulers, error)
@@ -1741,7 +1750,7 @@
 	PoweronONUsOnPON(context.Context, *PONRequest) (*Response, error)
 	// Restart EAPOL for ONU
 	RestartEapol(context.Context, *ONURequest) (*Response, error)
-	// Resatrt DHCP for ONU
+	// Restart DHCP for ONU
 	RestartDhcp(context.Context, *ONURequest) (*Response, error)
 	// Send ONU alarm indication
 	SetOnuAlarmIndication(context.Context, *ONUAlarmRequest) (*Response, error)
@@ -1749,7 +1758,7 @@
 	SetOltAlarmIndication(context.Context, *OLTAlarmRequest) (*Response, error)
 	// Get all flows or ONU specific flows
 	GetFlows(context.Context, *ONURequest) (*Flows, error)
-	// Chnage IGMP state
+	// Change IGMP state
 	ChangeIgmpState(context.Context, *IgmpRequest) (*Response, error)
 	// Get Traffic scheduler information for ONU
 	GetOnuTrafficSchedulers(context.Context, *ONURequest) (*ONUTrafficSchedulers, error)
diff --git a/api/bbsim/bbsim.proto b/api/bbsim/bbsim.proto
index 39e7cea..dab179d 100644
--- a/api/bbsim/bbsim.proto
+++ b/api/bbsim/bbsim.proto
@@ -169,6 +169,7 @@
 message IgmpRequest {
     ONURequest OnuReq = 1;
     SubActionTypes SubActionVal = 2;
+    string GroupAddress = 3;
 }
 
 message Flows {
@@ -251,7 +252,7 @@
     // Restart EAPOL for ONU
     rpc RestartEapol (ONURequest) returns (Response) {
     }
-    // Resatrt DHCP for ONU
+    // Restart DHCP for ONU
     rpc RestartDhcp (ONURequest) returns (Response) {
     }
     // Send ONU alarm indication
@@ -263,7 +264,7 @@
     // Get all flows or ONU specific flows
     rpc GetFlows (ONURequest) returns (Flows) {
     }
-    // Chnage IGMP state 
+    // Change IGMP state
     rpc ChangeIgmpState (IgmpRequest) returns (Response) {
     }
     // Get Traffic scheduler information for ONU