Cisco Systems UBR-3X10 Interface Overview, Interface Numbering, MAC-Layer Address Assignments

Chapter 1 Cisco uBR-3x10 RF Switch Overview

About the Cisco uBR 3x10 RF Switch

Figure 1-2 Rear View of the Cisco uBR-3x10 RF Switch

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1	Mounting brackets	3	PROTECT MCX connector location
2	CMTS (working) MCX connector location	4	CABLE PLANT MCX connector location

Interface Overview

The following sections describe interface numbering, and MAC address assignments.

Interface Numbering

In all of the Cisco RF switches, the slot number is the chassis slot in which an Ethernet controller or an upstream switch module or downstream switch module is installed, and the logical interface number is the physical location of the interface port on an Ethernet controller.

The MAC-layer or hardware address is a standardized data link layer address that is required for certain network interface types. The Cisco uBR 3x10 RF Switch uses a specific method to assign and control the MAC-layer addresses of its Ethernet controller.

The Ethernet controller and upstream and downstream module slots keep the same slot number regardless of whether other Ethernet controllers or upstream or downstream modules are installed or removed. However, when you move an upstream or downstream module to a different slot, the logical interface number changes to reflect the new slot number. The Ethernet card is always installed in the same slot.

For complete descriptions and instructions for the commands used to configure your Cisco RF switch, refer to the “N+1 Redundancy for the Cisco CMTS” chapter of the Cisco CMTS Feature Guide, which is available on Cisco.com. (See the “Obtaining Documentation” section on page 11.)

MAC-Layer Address Assignments

All LAN interfaces (ports) require unique MAC-layer addresses, also known as hardware addresses. Typically, the MAC address of an interface is stored on a memory component that resides directly on the interface circuitry; however, the online insertion and removal (OIR) feature requires a different method.

Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide

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