diff --git a/test_plans/vswitch_sample_cbdma_test_plan.rst b/test_plans/vswitch_sample_cbdma_test_plan.rst
index 93887695..f231b8af 100644
--- a/test_plans/vswitch_sample_cbdma_test_plan.rst
+++ b/test_plans/vswitch_sample_cbdma_test_plan.rst
@@ -1,6 +1,6 @@
-=========================================
-Vswitch Vhost-user async driver test plan
-=========================================
+========================================================
+Vswitch sample test with vhost async data path test plan
+========================================================
 
 Description
 ===========
@@ -56,13 +56,13 @@ Test Case1: PVP performance check with CBDMA channel using vhost async driver
 
 3. On host, launch dpdk-vhost by below command::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – \
-	-p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat --stats 1 --socket-file /tmp/vhost-net -dmas [txd0@00:04.0]
+	./dpdk-vhost -c 0x1c000000 -n 4 -- \
+	-p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat --stats 1 --socket-file /tmp/vhost-net --dmas [txd0@00:04.0]
 
 4. Launch virtio-user with testpmd::
 
 	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
-	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net,queues=1 -- -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1
 
 5. Start pkts from virtio-user side to let vswitch know the mac addr::
 
@@ -89,44 +89,46 @@ Test Case1: PVP performance check with CBDMA channel using vhost async driver
 
 8. Re-test step 3-6 except to launch dpdk-vhost by below command, record perfromance of different packet length::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --stats 1 --socket-file /tmp/vhost-net
+	./dpdk-vhost -c 0x1c000000 -n 4 -- -p 0x1 --mergeable 1 --vm2vm 1 --stats 1 --socket-file /tmp/vhost-net
 
 9. Compare performance, check below two performance indicator::
 
 	(1)CPU copy vs. sync copy delta < 10% for 64B packet size
 	(2)CBDMA copy vs sync copy delta > 5% for 1518 packet size
 
-Test Case2: PVP test with multiple CBDMA channels using vhost async driver
+Test Case2: PV test with multiple CBDMA channels using vhost async driver
 ==========================================================================
 
 1. Bind one physical ports to vfio-pci and two CBDMA channels to igb_uio.
 
 2. On host, launch dpdk-vhost by below command::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – \
-	-p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat --stats 1 --socket-file /tmp/vhost-net0 -socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
+	./dpdk-vhost -l 26-28 -n 4 -- \
+	-p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat --stats 1 --socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1] --client
 
 3. launch two virtio-user ports::
 
-	./x86_64-native-linuxapp-gcc/app/testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
-	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1,server=1 -- -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1
 	
-	./x86_64-native-linuxapp-gcc/app/testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
-	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net1,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	./dpdk-testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net1,queues=1,server=1 -- -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1
 
 4. Start pkts from two virtio-user side individually to let vswitch know the mac addr::
 
-	testpmd0>set fwd mac
 	testpmd0>start tx_first
-	testpmd0>stop
-	testpmd0>start
-
-	testpmd1>set fwd mac
 	testpmd1>start tx_first
-	testpmd1>stop
-	testpmd1>start
 
-5. Inject traffic with VLAN_id=1000 and dest_mac=virtio_mac_addresss (00:11:22:33:44:10 and 00:11:22:33:44:11) to NIC using packet generator, check two virtio-user ports can receive according packets.
+5. Inject 1518B packets with VLAN_id=1000 and dest_mac=virtio_mac_addresss (00:11:22:33:44:10 and 00:11:22:33:44:11) to NIC using packet generator,check two virtio-user ports can receive according packets.
+
+6. Stop dpdk-vhost side and relaunch it with same cmd as step2.
+
+7.Start pkts from two virtio-user side individually to let vswitch know the mac addr, check two virtio-user ports still can receive according packets and get same throughput as step5::
+
+        testpmd0>stop
+        testpmd0>start tx_first
+        testpmd1>stop
+        testpmd1>start tx_first
 
 Test Case3: VM2VM performance test with two CBDMA channels using vhost async driver
 ====================================================================================
@@ -135,16 +137,16 @@ Test Case3: VM2VM performance test with two CBDMA channels using vhost async dri
 
 2. On host, launch dpdk-vhost by below command::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat \
+	./dpdk-vhost -l 27-28 -n 4 -- -p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat \
 	--socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
 
 3. Launch virtio-user::
 
-	./testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
-	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1 -- -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1
 
-	./x86_64-native-linuxapp-gcc/app/testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
-	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	./dpdk-testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net0,queues=1 -- -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1
 
 4. Start pkts from two virtio-user sides, record performance number with txpkts=256 and 2000 from testpmd1 seperately::
 
@@ -166,7 +168,7 @@ Test Case3: VM2VM performance test with two CBDMA channels using vhost async dri
 
 5. Re-test step 2-4 except to launch dpdk-vhost by below command, record perfromance::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1
+	./dpdk-vhost -l 27-28 -n 4 -- -p 0x1 --mergeable 1 --vm2vm 1 --socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1
 
 6. Compare perfromance number, when txpkts=2000, first test has better performance; while txpkts=256, the second test has better performance.
 
@@ -177,34 +179,34 @@ Test Case4: VM2VM test with 2 vhost device using vhost async driver
 
 2. On host, launch dpdk-vhost by below command::
 
-	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat \
+	./dpdk-vhost -l 27-28 -n 4 -- -p 0x1 --mergeable 1 --vm2vm 1 --dma-type ioat \
 	--socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
 
 3. Start VM0::
 
  	/home/qemu-install/qemu-4.2.1/bin/qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 4 -m 4096 \
-    -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
-    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.img  \
-    -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
-    -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
-    -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
-    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
-    -chardev socket,id=char0,path=/tmp/vhost-net0 \
-    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :10
+        -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
+        -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04.img  \
+        -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
+        -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
+        -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
+        -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
+        -chardev socket,id=char0,path=/tmp/vhost-net0 \
+        -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+        -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :10
 
 4. Start VM1::
 
 	/home/qemu-install/qemu-4.2.1/bin/qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 4 -m 4096 \
-    -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
-    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04-2.img  \
-    -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
-    -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
-    -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
-    -netdev user,id=nttsip1,hostfwd=tcp:10.67.119.61:6003-:22 \
-    -chardev socket,id=char0,path=/tmp/vhost-net1 \
-    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
-    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :12
+        -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
+        -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu20-04-2.img  \
+        -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
+        -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
+        -monitor unix:/tmp/vm2_monitor.sock,server,nowait -device e1000,netdev=nttsip1 \
+        -netdev user,id=nttsip1,hostfwd=tcp:10.67.119.61:6003-:22 \
+        -chardev socket,id=char0,path=/tmp/vhost-net1 \
+        -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+        -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :12
 
 5. Bind virtio port to vfio-pci in both two VMs::
 
@@ -215,7 +217,7 @@ Test Case4: VM2VM test with 2 vhost device using vhost async driver
 
 6. Start testpmd in VMs seperately::
 
-	./dpdk-testpmd -l 1-2 -n 4 – -i --rxq=1 --txq=1 --nb-cores=1 --txd=1024 --rxd=1024
+	./dpdk-testpmd -l 1-2 -n 4 -- -i --rxq=1 --txq=1 --nb-cores=1 --txd=1024 --rxd=1024
 
 7. Start pkts from two virtio-pmd, record performance number with txpkts=256 and 2000 from testpmd1 seperately::
 
@@ -237,6 +239,10 @@ Test Case4: VM2VM test with 2 vhost device using vhost async driver
 
 8. Inject traffic with VLAN_id=1000 and dest_mac=virtio_mac_addresss (52:54:00:00:00:02 and 52:54:00:00:00:02) to NIC using packet generator, check two virtio-pmd can receive according packets.
 
-9. Quit two testpmd in two VMs, bind virtio-pmd port to virtio-pci,then bind port back to vfio-pci, rerun 50 times.
+9. Quit two testpmd in two VMs, bind virtio-pmd port to virtio-pci,then bind port back to vfio-pci, rerun below cmd 50 times::
 
+	./usertools/dpdk-devbind.py -u 00:05.0
+	./usertools/dpdk-devbind.py --bind=virtio-pci 00:05.0
+	./usertools/dpdk-devbind.py --bind=vfio-pci 00:05.0
 
+10. Rerun step 6-8，check vhost can stable work.
