Mac Addresses - Cisco 7600 Series Module Manual

Chapter 1 Modules Overview
Figure 1-1 Slot Numbers on Cisco 7609 Router
assembly
Interface ports maintain the same addresses regardless of whether other modules are installed or
removed. However, when you move a module to a different slot, the first number in the address changes
to reflect the new slot number. For example, on a 48-port 10/100BASE-T module in slot 2, the address
of the left port is 2/1 and the address of the right port is 2/48. If you remove the 48-port 10/100BASE-T
module from slot 2 and install it in slot 4, the addresses of those same ports become 4/1 through 4/48.
The supervisor engine is n/1 to n/2 because it supports two interfaces: ports 1 and 2. Router modules are
addressed n/1 through n/N.
You can identify each module port by checking its slot and port location on the router. You can also use
software commands to display information about a specific interface, or all interfaces, in the router. To
display information about every interface, enter the show port command without parameters. To display
information about a specific interface, enter the show port command with the module (slot) number and
port number in the format show port [mod_num/port_num].

MAC Addresses

All network interface connections (ports) require a unique MAC address. The MAC address of an
interface is stored in electrically erasable programmable read-only memory (EEPROM) on a component
that resides directly on the interface circuitry. The router system code reads the EEPROM for each
OL-9392-05
OSMs
FAN
STATUS
Fan
o
Power supply 1
ESD ground strap
o
INPUT FAN
OUTPUT
OK
OK FAIL
INPUT
FAN OUTPUT
OK OK
FAIL
Power supply 2
(redundant)
connection
Supervisor
engine
Redundant
supervisor
engine
Switch
Fabric
Module
Redundant
Switch
Fabric
Module
Slots 1-9
(right to left)
Cisco 7600 Series Router Module Guide
Port Addresses
1-3