Information Technology Reference
In-Depth Information
Example 3-15 show version Command (Continued)
2 Serial(sync/async) network interface(s)
1 Channelized E1/PRI port(s)
1 Channelized T1/PRI port(s)
256K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (AMD29F016)
Configuration register is 0x2102
Other chapters in this topic contain more detailed discussions of the show commands relevant
to the topic at hand. As a CCIE candidate, you must be familiar with the available show
commands.
Debug
The debug commands are available only in privileged exec (enable) mode. If you attempt to use
debug in user exec mode, the command is not recognized. You must use debug commands with
caution because the router's CPU use significantly increases when debugging is enabled.
If you access the router through a virtual terminal, such as Telnet, you need to enter the
terminal monitor command to have debug output show on your screen. This command is not
necessary if you access the router from the console.
NOTE
Use the debug ? command to check the available debugging options, as shown in Example 3-16.
Example 3-16 debug Command Options
R2#debug ?
MC3810 MC3810 related debug flag
aaa AAA Authentication, Authorization and Accounting
access-expression Boolean access expression
all Enable all debugging
alps ALPS debug information
arp IP ARP and HP Probe transactions
...
To debug routing protocols, you can use debug ip routing or one of the more specific
commands displayed in Table 3-3.
 
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