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Table of Contents
Hardware
| 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 's | N/A | N/A | N/A |
This stuff is all in the network training rack (The 12U flight case)
Basics
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: (Note that telnet is a bit odd and the escape sequence is usually
Ctrl-]
)
$ telnet 192.168.0.1
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 192.168.0.1 6032//+CABLE_NUM//
The escape sequence for IOS telnet is not
Ctrl-]
but
Ctrl-Shift-6 x
because reasons. If you're using IOS telnet, this won't kill the session, and will actually prevent others from accessing the box via telnet. To kill the session, do the following after escaping:
sc>show sessions Conn Host Address Byte Idle Conn Name * 1 192.168.0.1 192.168.0.1 0 0 192.168.0.1 sc>disconnect //SESSION_NUM// Closing connection to 192.168.0.1 [confirm] sc>
Where
SESSION_NUM
is the session from the list you wish to kill. Hit enter when prompted by
Closing connection to 192.168.0.1 [confirm]
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 192.168.0.1 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>enable Password: ios#copy running-config startup-config Destination filename [startup-config]? Building configuration... [OK] ios#
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)
sc>enable Password: sc#
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.
sc#configure Configuring from terminal, memory, or network [terminal]? Enter configuration commands, one per line. End with CNTL/Z. sc(config)#
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 sc(config-line)# ...
Some of the more useful commands are
rxspeed
&
txspeed
to set the baud rates of the cables you selected. Once again,
?
is your friend.