diff --git a/app/proc-info/main.c b/app/proc-info/main.c
index b1a025a36..27065a231 100644
--- a/app/proc-info/main.c
+++ b/app/proc-info/main.c
@@ -685,10 +685,15 @@ show_port(void)
 			printf("Link get failed (port %u): %s\n",
 			       i, rte_strerror(-ret));
 		} else {
-			printf("\t  -- link speed %u duplex %d,"
+			printf("\t  -- link speed %u%s duplex %d%s,"
 					" auto neg %d status %d\n",
 					link.link_speed,
+					(link.link_speed == UINT32_MAX) ?
+					("(UNKNOWN)") : (" Mbps"),
 					link.link_duplex,
+					(link.link_duplex == 
+					 ETH_LINK_FULL_DUPLEX) ?
+					("(full)") : ("(half)"),
 					link.link_autoneg,
 					link.link_status);
 		}
diff --git a/app/test-pipeline/init.c b/app/test-pipeline/init.c
index 67d54ae05..09b762a4e 100644
--- a/app/test-pipeline/init.c
+++ b/app/test-pipeline/init.c
@@ -173,12 +173,14 @@ app_ports_check_link(void)
 			all_ports_up = 0;
 			continue;
 		}
-
-		RTE_LOG(INFO, USER1, "Port %u (%u Gbps) %s\n",
-			port,
-			link.link_speed / 1000,
-			link.link_status ? "UP" : "DOWN");
-
+		if (link.link_speed == UINT32_MAX)
+			RTE_LOG(INFO, USER1, "Port %u (UNKNOWN Gbps) %s\n",
+				port, link.link_status ? "UP" : "DOWN");
+		else
+			RTE_LOG(INFO, USER1, "Port %u (%u Gbps) %s\n",
+				port,
+				link.link_speed / 1000,
+				link.link_status ? "UP" : "DOWN");
 		if (link.link_status == ETH_LINK_DOWN)
 			all_ports_up = 0;
 	}
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 661297ddd..96e668ae5 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -577,7 +577,8 @@ port_infos_display(portid_t port_id)
 		printf("\nmemory allocation on the socket: %u",port->socket_id);
 
 	printf("\nLink status: %s\n", (link.link_status) ? ("up") : ("down"));
-	printf("Link speed: %u Mbps\n", link.link_speed);
+	printf("Link speed: %u%s\n", link.link_speed,
+	       (link.link_speed == UINT32_MAX) ? ("(UNKNOWN)") : (" Mbps"));
 	printf("Link duplex: %s\n", (link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
 	       ("full-duplex") : ("half-duplex"));
 
@@ -722,12 +723,13 @@ port_summary_display(portid_t port_id)
 	if (ret != 0)
 		return;
 
-	printf("%-4d %02X:%02X:%02X:%02X:%02X:%02X %-12s %-14s %-8s %uMbps\n",
+	printf("%-4d %02X:%02X:%02X:%02X:%02X:%02X %-12s %-14s %-8s %u%s\n",
 		port_id, mac_addr.addr_bytes[0], mac_addr.addr_bytes[1],
 		mac_addr.addr_bytes[2], mac_addr.addr_bytes[3],
 		mac_addr.addr_bytes[4], mac_addr.addr_bytes[5], name,
 		dev_info.driver_name, (link.link_status) ? ("up") : ("down"),
-		link.link_speed);
+		link.link_speed,
+		(link.link_speed == UINT32_MAX) ? ("(UNKNOWN)") : (" Mbps"));
 }
 
 void
@@ -3787,7 +3789,7 @@ set_queue_rate_limit(portid_t port_id, uint16_t queue_idx, uint16_t rate)
 	ret = eth_link_get_nowait_print_err(port_id, &link);
 	if (ret < 0)
 		return 1;
-	if (rate > link.link_speed) {
+	if (link.link_speed != UINT32_MAX && rate > link.link_speed) {
 		printf("Invalid rate value:%u bigger than link speed: %u\n",
 			rate, link.link_speed);
 		return 1;
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index d4df23a93..9b47886f7 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -3002,8 +3002,10 @@ check_all_ports_link_status(uint32_t port_mask)
 			if (print_flag == 1) {
 				if (link.link_status)
 					printf(
-					"Port%d Link Up. speed %u Mbps- %s\n",
+					"Port%d Link Up. speed %u%s- %s\n",
 					portid, link.link_speed,
+				(link.link_speed == UINT32_MAX) ?
+					("(UNKNOWN)") : (" Mbps"),
 				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
 					("full-duplex") : ("half-duplex"));
 				else
diff --git a/app/test/test_pmd_perf.c b/app/test/test_pmd_perf.c
index 352cd4715..c8124676d 100644
--- a/app/test/test_pmd_perf.c
+++ b/app/test/test_pmd_perf.c
@@ -148,8 +148,10 @@ check_all_ports_link_status(uint16_t port_num, uint32_t port_mask)
 			if (print_flag == 1) {
 				if (link.link_status) {
 					printf(
-					"Port%d Link Up. Speed %u Mbps - %s\n",
+					"Port%d Link Up. Speed %u%s - %s\n",
 						portid, link.link_speed,
+				(link.link_speed == UINT32_MAX) ?
+					("(UNKNOWN)") : (" Mbps"),
 				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
 					("full-duplex") : ("half-duplex"));
 					if (link_mbps == 0)
