Cisco Equipment Operations - CCIE Routing and Switching Exam Certification Guide - page 82

IP address is configured on the terminal server for reverse Telnet. If the terminal server's loop-
back IP address is 1.1.1.1, the telnet 1.1.1.1 2001 command connects to the router through the
first asynchronous line. The second router is accessed through the second asynchronous line by
using the telnet 1.1.1.1 2002 command. You can switch between the routers and the terminal
server by using the CTRL-SHIFT-6 x key sequence.
SNMP
To access the router from a SNMP server, the SNMP read and read-write community strings
need to be configured. The router can also be configured to send SNMP traps to the network
management server.
To set the SNMP read-only community string, use the snmp community command. The
following sets the read-only string to ccie-read:
R1(config)#snmp community ccie-read ro
The read-write community string is also set with the snmp community command. The
following is set to ccie-write:
R1(config)#snmp community ccie-write rw
To send all traps to the SNMP server (1.1.1.1) with the SNMP community string of ccie-trap,
enter the following global configuration command:
R1(config)#snmp host 1.1.1.1 ccie-trap
Router CLI
This section reviews the router CLI by reviewing show and debug commands. In the user exec
or privileged exec mode, you can use show commands to display the status of routing protocols,
interfaces, and the system.
You can check many keywords. Use the show ? command to go through the available options.
Example 3-12 shows how you can bring up the various show command options (the list has
been reduced) by typing show ? . The show access-list command displays all configured access
lists on the router. The show accounting command shows active sessions and statistics. The
show flash command displays the contents of the flash file system. Frame Relay information is
displayed with the show frame-relay command. Interface information is displayed with the
show interfaces command. The show running-config displays the active configuration. The
show startup-config displays the configuration in NVRAM. The important show commands
for each topic are covered in the corresponding sections throughout this topic.
Example 3-12 Some Options of the show Command
R2#show ?
access-lists List access lists
accounting Accounting data for active sessions
flash: display information about flash: file system