CISCO Archives

Configuring a Cisco Router

In the following sections, I’ll introduce the commands used to do basic router configuration.
You’ll use these commands (or should use them) on every router while you re configuring a Cisco router.

Setting a Router Hostname

Router#config t
Router(config)#hostname Kaya
Kaya(config)#

Setting Passwords

Here’s an example of setting all your passwords and then encrypting them in the plain configuration file:

Kaya#config t
Kaya(config)#line aux ?
<0-0> First Line number
Kaya(config)#line aux 0
Kaya(config-line)#password aux
Kaya(config-line)#login
Kaya(config-line)#line con 0
Kaya(config-line)#password console
Kaya(config-line)#login
Kaya(config-line)#exit
Kaya(config)#line vty 0 ?
<1-1180> Last Line number
<cr>
Kaya(config)#line vty 0 1180

Voice Troubleshooting

A voice call over a packet network is segmented into discrete call legs. A call leg is a logical connection between two voice gateways or between a gateway and an IP telephony device. Troubleshooting, debugging and sniffing should focus first on each leg independently and then on the VoIP call as a whole. You can isolate where a problem is occurring by determining which dial peer or call leg is having the problem.

You need to understand the call path through the router in order to determine where a problem is occurring.

• Call control application programming interface (CCAPI)—Three clients make use of the CCAPI: command-line interface (CLI), Simple Network Management Protocol (SNMP) agent and Session Application. The CCAPI main functions are:
– Identify the call legs (Which dial peer is it? Where did it come from?).
– Decide which session application takes the call (Who handles it?).
– Invoke the packet handler.
– Conference […]