Mac-Layer Addressing; Cable Interface Line Cards - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 1 Overview of Cisco uBR7200 Series Software

MAC-Layer Addressing

The Media Access Control (MAC)-layer or hardware address is a standardized data link layer address
required for certain network interface types. These addresses are not used by other devices in the
network; they are specific and unique to each port. The Cisco uBR7200 series uses a specific method to
assign and control the MAC-layer addresses for port adapters.
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.
The OIR feature lets you remove a port adapter or cable interface card and replace it with another
identically configured one. If the new port adapter or cable interface card matches the port adapter or
cable interface card you removed, the system immediately brings it online.
To support OIR, an address allocator with a unique MAC address is stored in an EEPROM on the
universal broadband router midplane. Each address is reserved for a specific port and slot in the router
regardless of whether a port adapter or a cable interface card resides in that slot.
Port adapter and cable interface card slots maintain the same slot number regardless of whether other port
Note
adapters or cable interface cards are installed or removed. However, when you move a port adapter or
cable interface card to a different slot, the logical interface number changes to reflect the new slot number.
When "hot swapping" a port adapter or cable interface line card with a different type of component (for
Caution
example, an MC11 FPGA with an MC11C, or an MC16B with an MC16C), you might have to
reconfigure the interfaces. Refer to the Cisco uBR7200 Series Universal Broadband Router Hardware
Installation Guide or appropriate FRU document for more specific information regarding online
insertion and removal (OIR).
The MAC addresses are assigned to the slots in sequence. The first addresses are assigned to port adapter
slot 0 and slot 1, and the next addresses are assigned to port adapter slot 2 through cable interface card
slot 6. This address scheme allows you to remove port adapters or cable interface cards and insert them
into other universal broadband routers without causing the MAC addresses to move around the network
or be assigned to multiple devices.
Storing the MAC addresses for every slot in one central location means the addresses stay with the
memory device on which they are stored.

Cable Interface Line Cards

As of the date of this publication, the following Cisco cable interface cards can be installed in a
Cisco uBR7200 series router:
•
OL-2239-05
MC11 with one downstream modulator and one upstream demodulator. Two different revisions exist
for this card:
The FPGA version of the card supports the following defaults: Quadrature Amplitude
–
Modulation (QAM)-64 at 27 Mbps downstream, and Quadrature Phase Shift Keying (QPSK) at
1.280 kbps upstream. The card outputs +32 dBmV and +/- 2 dBmV.
The C version of the card supports the following defaults: QAM-256 at 40 Mbps downstream
–
and QAM-16 at 5 Mbps upstream. The card supports upstream channel widths of 200 kHz,
400 kHz, 800 kHz, 1.6 MHz, and 3.2 MHz. The card outputs +42 dBmV and +/- 2 dBmV.
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Cisco uBR7200 Series Router Configuration Overview
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