MAC Addresses

Chapter 1 Product Overview

Functional Overview

Cable1/0 Upstream 0 is up

Frequency 38.000 MHz, Channel Width 3.200 MHz, 16-QAM Symbol Rate 2.560 Msps Spectrum Group is overridden

SNR 30.8820 dB

(statistical information omitted)

FastEthernet3/0 is up, line protocol is up

Hardware is DEC21140A, address is 0002.b9ff.7c28 (bia 0002.b9ff.7c28) Internet address is 10.100.68.100/24

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, (statistical information omitted)

You can also use arguments such as the interface type (Ethernet, Token Ring, ATM, and so forth) and the slot/port number to display information about a specific interface only. The following example shows the display for the fixed LAN (Fast Ethernet interface) port 0 in slot 0:

Router# show interfaces fastethernet 0/0 FastEthernet0/0 is up, line protocol is up

Hardware is DEC21140A, address is 0050.73ff.6300 (bia 0050.73ff.6300) Internet address is 10.0.0.0/1

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set Keepalive set (10 sec)

Half-duplex, 10Mb/s, 100BaseTX/FX ARP type:ARPA, ARP Timeout 04:00:00

Last input 00:00:04, output 00:00:03, output hang never Last clearing of "show interface" counters never Queueing strategy:fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 2000 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

134 packets input, 41451 bytes

Received 134 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast

0 input packets with dribble condition detected

26 packets output, 5281 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

For information on the other commands used to configure the router, refer to the Cisco IOS configuration guides and command references. See the “Related Documentation” section on page viii.

The Media Access Control (MAC) or hardware address is a standardized data-link layer address that is 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 router uses a specific method to assign and control the MAC addresses of its port adapter.

All LAN interfaces (ports) require unique MAC 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. For a description of OIR, see the “Online Insertion and Removal” section on page 1-14.

The OIR feature allows you to remove a port adapter and replace it with another identically configured one. If the new port adapter matches the port adapter you removed, the system immediately brings it online.

Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide

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