Network Router User's Manual

Using the Command-Line Interface 1-3
Understanding Interface Numbering
Tips
If you are having difficulty entering a command, check the prompt and then enter the
question mark (?) for a list of available commands. You might be in the wrong command
mode or using the wrong syntax.
Understanding Interface Numbering
Before you can configure a software interface, you need to know how the physical location
of the port adapter or interface module in the chassis corresponds to how it is addressed
(referred to) in the software. In interface configuration mode, you must enter the
card/subcard/port number to configure an interface:
• card—Card number
• subcard—Subcard number
• port—Port number
Card, subcard, and port numbering all start at 0 and increment by 1, from top to bottom, and
from left to right.
Note In the subsections that follow, the Catalyst8540MSR chassis is shown because it is
the most robust system. The Catalyst8540MSR chassis has 13 slots and supports
redundant route processors and switch cards. The Catalyst8510MSR and
LightStream1010 chassis have only 5 slots and do not support redundant route processors
or switch cards. But the numbering scheme concept is the same, regardless of which chassis
you have.