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Chapter 4

Introduction to the Cisco IOS and SDM

The preceding MOTD banner essentially tells anyone connecting to the router to get lost

if they’re not on the guest list! The part to understand is the delimiting character—the thing

that’s used to tell the router when the message is done. You can use any character you want

for it, but (I hope this is obvious) you can’t use the delimiting character in the message itself.

Also, once the message is complete, press Enter, then the delimiting character, and then Enter

again. It’ll still work if you don’t do that, but if you have more than one banner, they’ll be com-

bined as one message and put on a single line.

For example, you can set a banner on one line as shown:

Todd(config)#banner motd x Unauthorized access prohibited! x

This example will work just fine, but if you add another MOTD banner message, they would

end up on a single line.

Here are some details of the other banners I mentioned:

Exec banner You can configure a line-activation (exec) banner to be displayed when an

EXEC process (such as a line activation or incoming connection to a VTY line) is created. By

simply starting a user exec session through a console port, you’ll activate the exec banner.

Incoming banner You can configure a banner to be displayed on terminals connected to reverse

Telnet lines. This banner is useful for providing instructions to users who use reverse Telnet.

This banner is displayed after the MOTD banner but before the login prompts. The login banner

can’t be disabled on a per-line basis, so to globally disable it, you’ve got to delete it with the no

banner login command.

Here is an example of a login banner:

banner login ^C

-----------------------------------------------------------------

Cisco Router and Security Device Manager (SDM) is installed on this device.

This feature requires the one-time use of the username "cisco"

with the password "cisco". The default username and password have a privilege

level of 15.

Please change these publicly known initial credentials using SDM or the IOS

CLI.

Here are the Cisco IOS commands.

username <myuser> privilege 15 secret 0 <mypassword>

no username cisco

Replace <myuser> and <mypassword> with the username and password you want to

use.

For more information about SDM please follow the instructions in the QUICK

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