Physical Interface Addresses - Cisco 7000 Hardware Installation And Maintenance

Physical Interface Addresses

In the Cisco 7000, physical port addresses specify the actual physical location of each interface port
on the router back panel. (See Figure 1-23.) The address is composed of a two-part number in the
format slot/port number. The first number identifies the slot in which the interface processor is
installed (0 through 4). The second number identifies the physical port number on the interface
processor. The ports on each interface processor are numbered sequentially from 0, beginning with
the port at the top.
Interface ports maintain the same address regardless of whether other interface processors are
installed or removed. However, when you move an interface processor to a different slot, the first
number in the address changes to reflect the new slot number. For example, on a six-port EIP in slot
3, the address of the top port is 3/0 and that of the bottom port is 3/5. If you remove the EIP from
slot 3 and install it in slot 4, the addresses of those same ports become 4/0 and 4/5.
Figure 1-23 shows some of the port numbers of a sample system.
Figure 1-23
1/0
1/1
1/5
Interface slots are numbered 0 to 4 from left to right. The port numbers always begin at 0 and are
numbered from the top port down. The number of additional ports (/1, /2, and so on) depends on the
number of ports available on an interface. FDDI interfaces are always n/0, because each FIP supports
one interface. (The multiple connectors on the FIP can be misleading, but they provide multiple
attachment options for a single FDDI interface.) Ethernet interfaces can be numbered from /0
through /5 because EIPs support up to six Ethernet ports. Serial interfaces on an eight-port FSIP are
numbered /0 through /7, and so on.
Interface Port Address Examples
3/0
4/0
Slot 1
2 3 4
Functional Overview
Product Overview 1-55