diff --git a/pmc_common.c b/pmc_common.c
index 2c75074..41385da 100644
--- a/pmc_common.c
+++ b/pmc_common.c
@@ -78,7 +78,7 @@ struct pmc *pmc_create(enum transport_type transport_type, const char *iface_nam
 		goto failed;
 	}
 	pmc->port_identity.portNumber = 1;
-	memset(&pmc->target, 0xff, sizeof(pmc->target));
+	pmc_target_all(pmc);
 
 	pmc->boundary_hops = boundary_hops;
 	pmc->domain_number = domain_number;
@@ -325,3 +325,13 @@ int pmc_target(struct pmc *pmc, struct PortIdentity *pid)
 	pmc->target = *pid;
 	return 0;
 }
+
+void pmc_target_port(struct pmc *pmc, UInteger16 portNumber)
+{
+	pmc->target.portNumber = portNumber;
+}
+
+void pmc_target_all(struct pmc *pmc)
+{
+	memset(&pmc->target, 0xff, sizeof(pmc->target));
+}
diff --git a/pmc_common.h b/pmc_common.h
index 9fcb51d..9adb9d1 100644
--- a/pmc_common.h
+++ b/pmc_common.h
@@ -41,5 +41,7 @@ int pmc_send_set_action(struct pmc *pmc, int id, void *data, int datasize);
 struct ptp_message *pmc_recv(struct pmc *pmc);
 
 int pmc_target(struct pmc *pmc, struct PortIdentity *pid);
+void pmc_target_port(struct pmc *pmc, UInteger16 portNumber);
+void pmc_target_all(struct pmc *pmc);
 
 #endif