Cisco Router 7204 Installation And Configuration Manual page 40

Functional Overview
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 Cisco 7204 uses a specific method to assign and
control the MAC addresses of its port adapters. For a description of the MAC-layer address, see the
section
Port adapter slots maintain the same slot number regardless of whether other port or service adapters are
installed or removed. However, when you move a port adapter to a different slot, the port adapter's slot
number changes to reflect the new slot number.
You can identify port adapter slots by using software commands to display information about a specific
port or service adapter or for all port and service adapters in the Cisco 7204. To display information
about all port adapter slots, use the show interfaces command. To display information about a specific
port adapter slot, use the show interfaces command with the port adapter type and slot number in the
format show interfaces (port adapter type and slot number/port number). If you abbreviate the
command (sh int) and do not specify port adapter type and slot number (or arguments), the system
interprets the command as show interfaces and displays the status of all port adapters and ports.
Following is an example of how the show interfaces command, used without arguments, displays status
information (including the physical port adapter number) for each port adapter in a Cisco 7204.
In the following example, most of the status information for each interface is omitted.
Router# sh int
FastEthernet0/0 is administratively up, line protocol is up
Hardware is DEC21140, address is 0000.0000.0000 (bia 0000.0000.0000)
Internet address is 1.1.1.3
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
(display text omitted)
Fddi1/0 is administratively down, line protocol is down
Hardware is MIF68840_MM, address is 0000.0000.0000 (bia 0000.0000.0000)
Internet address is 1.1.1.0
MTU 4470 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
(display text omitted)
Ethernet2/0 is administratively up, line protocol is up
Hardware is AmdP2, address is 0000.0000.0000 (bia 0000.0000.0000)
Internet address is 1.1.1.7
MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
(display text omitted)
You can also use arguments such as the interface type (Ethernet, TokenRing, Fddi, and so forth) and the
port address (slot/port) to display information about a specific interface only.
The following example shows the display for the first port on the Token Ring port adapter in port adapter
slot 3:
Router# sh int tokenring 3/0
TokenRing3/0 is administratively down, line protocol is down
Hardware is IBM2692, address is 0000.0000.0000 (bia 0000.0000.0000)
Internet address is 1.1.1.8
MTU 4464 bytes, BW 1600 Kbit, DLY 630 usec, rely 255/255, load 1/255
Encapsulation SNAP, loopback not set, keepalive set (10 sec)
ARP type: SNAP, ARP Timeout 04:00:00
Ring speed: 16 Mbps
(display text omitted)
For complete descriptions and instructions for the commands used to configure your Cisco 7204, refer
to the Configuration Fundamentals Configuration Guide and Configuration Fundamentals Command
Reference publications, which are available on Cisco.com.
Cisco 7204 Installation and Configuration Guide
1-24
"MAC Address" section on page 1-25 in this chapter.
Chapter 1 Product Overview
OL-5101-02