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Chapter 1
Cisco uBR7225VXR Overview
Figure 1-3
1
MAC-Layer Address
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 OIR feature requires a different method. For a description of OIR, refer
to the
The OIR feature allows you to remove a cable interface line card and replace it with another identically
configured one. If the new cable interface line card matches the cable interface line card you removed,
the system immediately brings it online. In order to allow OIR, an address allocator with a unique MAC
address is stored in EPROM on the Cisco uBR7225VXR universal broadband router midplane. Each
address is reserved for a specific slot in the router regardless of whether a cable interface line card
resides in that slot.
The MAC addresses are assigned to the slots in sequence. This address scheme allows you to remove
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.
Note
Storing the MAC addresses for every slot in one central location means that the addresses stay with the
memory device on which they are stored.
For information on the commands used to configure your Cisco uBR7225VXR router, refer to the Cisco
IOS Configuration Fundamentals Configuration Guide at the following URL:
http://www.cisco.com/en/US/docs/ios/fundamentals/configuration/guide/12_4/cf_12_4_book.html
Also refer to the Cisco IOS Configuration Fundamentals Command Reference at the following URL:
http://www.cisco.com/en/US/docs/ios/fundamentals/command/reference/cf_book.html
OL-17309-01
Cisco uBR7255VXR Chassis and Cable Interface Line Cards
uBR7225-VXR
Cable interface line card slot 1
"Online Insertion and Removal" section on page
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
Cisco uBR7225VXR Network Interface Overview
1
uBR - E18U
uBR - E28U
2
Cable interface line card slot 2
2
5-1.
1-5
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Table of Contents
Troubleshooting
