Network Rack

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Revision as of 03:27, 3 February 2015 by Angusp (talk | contribs) (Using Serial)
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Model & Expansions Hostname / Label & Console Cable Telnet Port & Baud
Cisco 2600 Router NM-4E Ethernet module, WIC 2T R1 1 6033 115200
Cisco 2600 Router NM-4E Ethernet module, WIC 2T, WIC 1T R2 2 6034 115200
Cisco 2600 Router NM-4E Ethernet module, WIC 2T, WIC 1T R3 3 6035 115200
Cisco 2600 Serial Console NM-32A Async Serial module SC1 N/A N/A (Host) 9600 (NC)
Cisco Catalyst 3750 Switch None SW1 4 6036 9600
Cisco Catalyst 3750 Switch None SW2 5 6037 9600
Cisco Catalyst 3750 Switch None SW3 6 6038 9600
Cisco Catalyst 3750 Switch None SW4 7 6039 9600
Netgear FS108 Switch Attached to SC1, which runs DHCP (Actually User:angusp's N/A N/A N/A

This stuff is all in the network training rack (The 12U flight case)


All the networking equipment bar the Netgear dumb switch, which is unmanaged, runs Cisco IOS. It's not much like anything else and basically the help command is ? which will help you with all your options, give you more specific help with commands, and give you help with arguments. Use it!

The serial console server (SC1) runs DHCP from it's Ethernet 0/0 port (Round the back of the rack). This is usually plugged straight into the Netgear FS108 so via that you can access SC1 over telnet like so:

$ telnet

and to access all the other devices over serial via SC1, bearing in mind that the CABLE_NUM is the console cable of the target device from the above table.

$ telnet 6032+CABLE_NUM

Using Serial

It's probably worth noting that direct serial isn't usually necessary, as all the serial consoles can be accessed via the SC1 telnet interface; SC1 itself can also be accessed via telnet. If you are serialing into SC1 and want to get at the telnet interface for the other boxes, IOS has a built in telnet command, although currently I have no idea what the escape sequence is...

ios>telnet 6033

Serial on linux can be a bit difficult to set up. Basically google how to do it for your distro, this'll usually include adding your user to the dialout group and maybe some device config. As for serial terminals, most are a bit shit. We'd suggest using minicom from the terminal and PuTTY from a GUI on Linux, and then Mac users have nicer things like CoolTerm. I'm not too sure about Windows but stuff like PuTTY seems to work well there also.

Saving Config Changes

IOS has the neat feature of not saving your config unless you tell it to - so if you totally screw it up and lock yourself out, power cycling the device will reset it to the previous config. Once something actually works and has been tested then you can save the config like so:

ios#copy running-config startup-config
Destination filename [startup-config]? 
Building configuration...

Give the password when prompted and hit enter at any further prompts. This will save the running config to the persistent memory. Also the reverse should (I haven't tried it) restore the boot config if you have't totally FUBAR'd the box.

ios#copy startup-config running-config

SC1 Serial Config

Enable the elevated privileges mode. Enter the password when prompted. (The # following the hostname indicates that privileged mode is enabled)


You can check the current serial config with

sc#show line
   Tty Typ     Tx/Rx     A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
*    0 CTY               -    -      -    -    -      0       1     0/0       -
    33 TTY 115200/115200 -    -      -    -    -      0       0     0/0       -
    34 TTY 115200/115200 -    -      -    -    -      0       0     0/0       -
    35 TTY 115200/115200 -    -      -    -    -      0       0     0/0       -
    36 TTY   9600/9600   -    -      -    -    -      0       0     0/0       -
    37 TTY   9600/9600   -    -      -    -    -      0       0     0/0       -
    38 TTY   9600/9600   -    -      -    -    -      0       0     0/0       -

Enter configuration mode. Hit enter when prompted by the Configure from terminal, memory, or network [terminal]? line.

Configuring from terminal, memory, or network [terminal]? 
Enter configuration commands, one per line.  End with CNTL/Z.

Type the following to configure a line. The Async card runs TTYs on lines 33 - 64, with like 33 being the 1st console cable from the hardware table. Use ? to check the other config details. (33 to 35 is an example - this will config lines 33, 34 & 35)

sc(config)#line tty 33 35

Some of the more useful commands are rxspeed & txspeed to set the baud rates of the cables you selected. Once again, ? is your friend.