Mac Addresses - Cisco WS-SUP720-3B - Supervisor Engine 720 User Manual

Chapter 1 Cisco 7600 Product Overview
Figure 1-1
Port numbers 1/1 to 1/2
Port numbers 2/1 to 2/2
Port numbers 3/1 to 3/4
Port numbers 4/1 to 4/4
Port numbers 7/1 to 7/4
Port numbers 8/1 to 8/8
Port numbers 9/1 to 9/8
The supervisor engine and route switch processor have two or more uplink ports (numbered n/1, n/2, and
so on). The Supervisor Engine 32 (WS-SUP32-GE-3B) has nine uplink ports, numbered n/1 to n/9.
In some cases, a single port supports two different types of connectors (for example, Port 2 on the
Supervisor Engine 720 supports a Gigabit Ethernet SFP module or a 10/100/1000-Mbps RJ-45
connector). However, only one of the two options can be active at a time.

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
interface in the system, learns the MAC addresses, and then initializes appropriate hardware and data
structures. Each VLAN in the spanning tree has one unique MAC address. This addressing scheme
enables the router to identify the state (connected or not connected) of each interface. When you hot
swap a module, the MAC address changes with the module.
OL-10100-11
Cisco 7609 Router Port Address Examples
FAN
STATUS
o
INPUT
FAN OUTPUT
OK OK
FAIL
Cisco 7600 Series Router Supervisor Engine and Route Switch Processor Guide
o
INPUT FAN
OUTPUT
OK
OK FAIL
Port Addresses
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