diff --git a/README.md b/README.md
index b04a961..8b23bce 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ import garage_admin_sdk
 (Not yet implemented)
 
 ```bash
-./mknet scenario ./scenarios/garage-s3lat ./topo/single-dc.yml
+./mknet scenario ./topo/single-dc.yml ./scenarios/garage-s3lat
 ```
 
 ## Manual usage
diff --git a/mknet b/mknet
index 5c09a18..60f7f74 100755
--- a/mknet
+++ b/mknet
@@ -349,22 +349,31 @@ def destroy():
     net.ns.forget("unconfined")
     os.remove(".current_state.yml")
 
+def scenario(config, cmd):
+    create(config)
+    runall(cmd)
+    destroy()
+
 if __name__ == "__main__":
     if len(sys.argv) < 2:
         progname = os.path.basename(sys.argv[0]) if len(sys.argv) > 0 else "mknet"
         print(f"""Usage:
-    {progname} create [config_path] # create a new network. config_path defailt to config.yml
+    {progname} scenario <config_path> <cmd> [args...] # all in one simulation: create a network, run the command on all nodes, destroy the network
+
+    {progname} create [config_path] # create a new network. config_path defailt to topo/with-vdsl.yml
     {progname} run-all <cmd> [args...] # run a command as each host. set the IP, NAME and ZONE environment variables
     {progname} run <name> [cmd [args...]] # run command in host named <name>. Use zonename:name if multiple zones hosts server with same name. If cmd is empty, run a shell
     {progname} destroy # destroy the current environment""")
         exit()
     cmd = sys.argv[1]
     if cmd == "create":
-        create(sys.argv[2] if len(sys.argv) > 2 else "config.yml")
+        create(sys.argv[2] if len(sys.argv) > 2 else "topo/with-vdsl.yml")
     elif cmd == "run":
         run(sys.argv[2], sys.argv[3:])
     elif cmd == "run-all":
         runall(sys.argv[2:])
+    elif cmd == "scenario":
+        scenario(sys.argv[2], sys.argv[3:])
     elif cmd == "destroy":
         destroy()    
     else: