diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 9615670..9d48048 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -466,6 +466,9 @@ static void cmd_help_long_parsed(void *parsed_result,
 			"set eth-peer (port_id) (peer_addr)\n"
 			"    set the peer address for certain port.\n\n"
 
+			"set custom-topo (port_id_1) (port_id_2)\n"
+			"    set custom topo.\n\n"
+
 			"set port (port_id) uta (mac_address|all) (on|off)\n"
 			"    Add/Remove a or all unicast hash filter(s)"
 			"from port X.\n\n"
@@ -7649,6 +7652,51 @@ cmdline_parse_inst_t cmd_set_fwd_eth_peer = {
 	},
 };
 
+/* *** SET CUSTOM TOPO FOR CERTAIN PORT *** */
+struct cmd_custom_topo_result {
+		cmdline_fixed_string_t set;
+		cmdline_fixed_string_t custom_topo;
+		portid_t port_id_1;
+		portid_t port_id_2;
+};
+
+static void cmd_set_custom_topo_parsed(void *parsed_result,
+				__attribute__((unused)) struct cmdline *cl,
+				__attribute__((unused)) void *data)
+{
+	struct cmd_custom_topo_result *res = parsed_result;
+
+	if (test_done == 0) {
+		printf("Please stop forwarding first\n");
+		return;
+	}
+	if (!strcmp(res->custom_topo, "custom-topo")) {
+		set_custom_topo(res->port_id_1, res->port_id_2);
+		fwd_config_setup();
+	}
+}
+cmdline_parse_token_string_t cmd_set_custom_topo_set =
+	TOKEN_STRING_INITIALIZER(struct cmd_custom_topo_result, set, "set");
+cmdline_parse_token_string_t cmd_set_custom_topo_custom_topo =
+	TOKEN_STRING_INITIALIZER(struct cmd_custom_topo_result, custom_topo, "custom-topo");
+cmdline_parse_token_num_t cmd_set_custom_topo_port_id_1 =
+	TOKEN_NUM_INITIALIZER(struct cmd_custom_topo_result, port_id_1, UINT16);
+cmdline_parse_token_num_t cmd_set_custom_topo_port_id_2 =
+	TOKEN_NUM_INITIALIZER(struct cmd_custom_topo_result, port_id_2, UINT16);
+
+cmdline_parse_inst_t cmd_set_custom_topo = {
+	.f = cmd_set_custom_topo_parsed,
+	.data = NULL,
+	.help_str = "set custom-topo (port_id_1) (port_id_2)",
+	.tokens = {
+			(void *)&cmd_set_custom_topo_set,
+			(void *)&cmd_set_custom_topo_custom_topo,
+			(void *)&cmd_set_custom_topo_port_id_1,
+			(void *)&cmd_set_custom_topo_port_id_2,
+			NULL,
+	},
+};
+
 /* *** CONFIGURE QUEUE STATS COUNTER MAPPINGS *** */
 struct cmd_set_qmap_result {
 	cmdline_fixed_string_t set;
@@ -16540,6 +16588,7 @@ cmdline_parse_ctx_t main_ctx[] = {
 	(cmdline_parse_inst_t *)&cmd_stop,
 	(cmdline_parse_inst_t *)&cmd_mac_addr,
 	(cmdline_parse_inst_t *)&cmd_set_fwd_eth_peer,
+	(cmdline_parse_inst_t *)&cmd_set_custom_topo,
 	(cmdline_parse_inst_t *)&cmd_set_qmap,
 	(cmdline_parse_inst_t *)&cmd_set_xstats_hide_zero,
 	(cmdline_parse_inst_t *)&cmd_operate_port,
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 16fc481..23799ad 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -2069,6 +2069,8 @@ fwd_topology_tx_port_get(portid_t rxp)
 		return (rxp + 1) % cur_fwd_config.nb_fwd_ports;
 	case PORT_TOPOLOGY_LOOP:
 		return rxp;
+	case PORT_TOPOLOGY_CUSTOM:
+		return fwd_streams[rxp]->tx_port;
 	}
 }
 
@@ -2378,6 +2380,45 @@ set_fwd_eth_peer(portid_t port_id, char *peer_addr)
 			new_peer_addr[c];
 }
 
+static void
+print_ports_range(void)
+{
+	portid_t pid;
+	printf("Valid port range is [");
+	RTE_ETH_FOREACH_DEV(pid)
+		printf(", %d", pid);
+	printf("]\n");
+}
+
+void
+set_custom_topo(portid_t port_id_1, portid_t port_id_2)
+{
+	unsigned int portlist[RTE_MAX_ETHPORTS];
+	unsigned int i;
+	unsigned int nb_pt = 0;
+	if (port_topology != PORT_TOPOLOGY_CUSTOM) {
+		printf("Please set the forward topology to custom first.\n");
+		return;
+	}
+	if (port_id_is_invalid(port_id_1, ENABLED_WARN)) {
+		print_ports_range();
+		return;
+	}
+	if (port_id_is_invalid(port_id_2, ENABLED_WARN)) {
+		print_ports_range();
+		return;
+	}
+	fwd_streams[port_id_1]->tx_port = port_id_2;
+	fwd_streams[port_id_2]->tx_port = port_id_1;
+	fwd_ports[port_id_1] = port_id_1;
+	fwd_ports[port_id_2] = port_id_2;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
+		if (fwd_ports[i] == i)
+			portlist[nb_pt++] = i;
+	set_fwd_ports_list(portlist, nb_pt);
+}
+
 int
 set_fwd_lcores_list(unsigned int *lcorelist, unsigned int nb_lc)
 {
diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index aea8af8..0db411d 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -139,8 +139,8 @@ usage(char* progname)
 	printf("  --enable-hw-vlan-extend: enable hardware vlan extend.\n");
 	printf("  --enable-drop-en: enable per queue packet drop.\n");
 	printf("  --disable-rss: disable rss.\n");
-	printf("  --port-topology=N: set port topology (N: paired (default) or "
-	       "chained).\n");
+	printf("  --port-topology=N: set port topology (N: paired (default)"
+	       "(loop), (custom) or (chained).\n");
 	printf("  --forward-mode=N: set forwarding mode (N: %s).\n",
 	       list_pkt_forwarding_modes());
 	printf("  --rss-ip: set RSS functions to IPv4/IPv6 only .\n");
@@ -920,6 +920,8 @@ launch_args_parse(int argc, char** argv)
 					port_topology = PORT_TOPOLOGY_CHAINED;
 				else if (!strcmp(optarg, "loop"))
 					port_topology = PORT_TOPOLOGY_LOOP;
+				else if (!strcmp(optarg, "custom"))
+					port_topology = PORT_TOPOLOGY_CUSTOM;
 				else
 					rte_exit(EXIT_FAILURE, "port-topology %s invalid -"
 						 " must be: paired, chained or loop\n",
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 1af87b8..3250683 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -67,6 +67,7 @@ enum {
 	PORT_TOPOLOGY_PAIRED,
 	PORT_TOPOLOGY_CHAINED,
 	PORT_TOPOLOGY_LOOP,
+	PORT_TOPOLOGY_CUSTOM,
 };
 
 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
@@ -363,6 +364,11 @@ extern uint8_t txring_numa[RTE_MAX_ETHPORTS];
 extern uint8_t socket_num;
 
 /*
+ * Store the custom topo.
+ */
+portid_t fwd_ports[RTE_MAX_ETHPORTS];
+
+/*
  * Configuration of logical cores:
  * nb_fwd_lcores <= nb_cfg_lcores <= nb_lcores
  */
@@ -598,7 +604,7 @@ void reconfig(portid_t new_port_id, unsigned socket_id);
 int init_fwd_streams(void);
 
 void set_fwd_eth_peer(portid_t port_id, char *peer_addr);
-
+void set_custom_topo(portid_t port_id_1, portid_t port_id_2);
 void port_mtu_set(portid_t port_id, uint16_t mtu);
 void port_reg_bit_display(portid_t port_id, uint32_t reg_off, uint8_t bit_pos);
 void port_reg_bit_set(portid_t port_id, uint32_t reg_off, uint8_t bit_pos,
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 013a405..5edf210 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -1090,6 +1090,14 @@ Set the forwarding peer address for certain port::
 
 This is equivalent to the ``--eth-peer`` command-line option.
 
+set custom-topo
+~~~~~~~~~~~~~~
+
+Set custom topology for forwading packets by making the given two ports as pair.
+In custom topology the active ports will be the defiend in custum-topo only::
+
+   testpmd> set custom-topo (port_id_1) (port_id_2)
+
 set port-uta
 ~~~~~~~~~~~~
 
