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Using the Command-Line Interface 1-7
Example of Interface Numbering
Example of Interface Numbering
Figure1-5 shows a Catalyst8540MSR chassis populated with several half-width port
adapters and full-width interface modules. In this example, 12/0/3 is called out in the last
interface module installed in the chassis. The 12/0/3 interface number is derived by:
• Card (12)—The interface module is in the thirteenth slot of the chassis; therefore, the
card number is 12. (Card numbering starts at 0 and increments by 1 from top to bottom.)
• Subcard (0)—The full-width interface module is the only subcard within the twelfth
slot; therefore, the subcard number is 0.
• Port (3)—The callout points to the fourth port on the interface module; therefore, the
port number is 3. (Port numbering starts at 0 and increments by 1 from left to right.)
Figure1-5 Interface Numbering Example (Catalyst8540MSR Shown)