MasterSwitch AP9211 (Reverse Telnet)

I just bought a AP9211 for my lab, so that I don’t have to turn on all the routers before I go to work or call someone to turn them all on. Unfortunately, the AP9211 Masterswitch does not have a manual or instruction how to configure it.

Fortunately, my routers have AUX port, and the AP9211 have a male serial interface.  The only way for me to configure the AP9211 is either through Telnet or console.

My first attempt was using Telnet.  What I did was, I took the AP9606 out and copied the MAC Address.  Then on my Macbook terminal, I used the command arp -s ip-address mac-address to assign a static IP address associated with the AP9606 MAC address.  Unfortunately, I still could not Telnet nor use the web GUI.  Therefore, I have to use the console.

Now, to reverse Telnet to the AP9211, we need a router with AUX port and a Serial console cable (rollover) with an RJ45 connector at the other end.  I used Cisco console cable.

I used my 2511 router and configured its AUX port:
! The speed is for the baud rate that AP9211 supports.

line aux 0
 modem InOut
 no exec
 transport input all
 transport output none
 speed 2400

! Then create a loopback for your reverse Telnet.

interface Loopback1
 description Reverse Telnet Loopback
 ip address

! After creating a loopback and configuring the router’s AUX port, go back to enable mode and use the command show line and look for
! the line your AUX is using.

2511show line
   Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
     0 CTY              -    -      -    -    -      0       0     0/0       -
    17 AUX   2400/2400  - inout     -    -    -      0       0     0/0       -

! From here we should be able to reverse Telnet to the AP9211.
! To telnet to the AP9211, we have to user 2000 + the line number in this case the line number is 17.  The port number is going to be 2017.

2511#telnet 2017
Trying, 2017 ... Open

User Access Verification


! Now, just type in the username and password.  The default username/password is apc/apc.  Unplug and replug the AP9211 then press the reset button for 5 seconds or until the AP9606 NIC’s turn off and back on.  Release the reset button then enter the default username/password.  Once you get in, you can change the settings.

About networkshinobi

My name is Karlo, I work as a Network Engineer. A little about myself. I started as a PC gamer back when I was in high school. PC gaming became my addiction and pushed me to learn more about computers. Slowly got my some certifications and landed an IT Tier 1 Helpdesk job. This job opened the door for me to work to push further on my certifications and going deeper into the IT world. My goal was to get my Cisco CCIE Routing and Switching, but my journey for CCIE has changed due to I always ended up working on non-Cisco network appliances. Therefore, I have to pivot and decided to jump to the dark side and go with Juniper. Hopefully, I would get my JNCIE in the near future. All the entries/post I made are based on my views, opinion and for educational purposes only. If you see some mistakes, feel free to drop some comments. I would appreciate all the helpful comments. Thanks
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2 Responses to MasterSwitch AP9211 (Reverse Telnet)

  1. Travis says:

    did you ever get the AP9211 configured? I just bought one for my lab and can’t seem to make it work. I was able to telnet to it to set it up by plugging my laptop directly in to it and manually configuring the ethernet port to be in the same subnet mask with it. The problem is now that I am in I don’t know what I need to do to turn on/off my equipment. Can you help?



    • networkshinobi says:

      Yes, whenever I go I can power on and off my equipments remotely now.

      Basically, you have two different ways to power on/off your devices. You can either telnet to the AP9211 or use a web browser.
      I prefer telnet because it is faster than the web GUI (using the GUI use http://ip-address:port-number)

      After you log into the AP9211, you will have four options:

      ——- Control Console ——————————————————-

      1- Device Manager
      2- Network
      3- System
      4- Logout

      – Main Menu, – Refresh

      Choose the first option Device Manager then it will take you the list and status of each power outlet.
      After that, you can select the outlet you want to power on/off.
      Once you decided which device you want to power on/off, you gonna have another option what you want to do with it:
      ——- Router 1 1841 ———————————————————

      Name : Router 1 1841
      State: OFF

      1- Immediate On
      2- Immediate Off
      3- Immediate Reboot
      4- Delayed On
      5- Delayed Off
      6- Delayed Reboot
      7- Cancel

      ?- Help, – Back, – Refresh
      In this case, I have my router off, so I can power it on by selecting the “Immediate On” option.

      Hope this helps.

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