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Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-04
Chapter1 Understanding Interface Numbering and Cisco IOS Software Basics
Understanding Interface Numbering
Figure1-8 WAN Interface Card Slots
Cisco 3600 Series Router Unit Numbering
Cisco 3600 series routers unit numbers identify the interfaces on the modules and WAN interface cards
installed in the router. Unit numbers begin at 0 for each interface type, and continue from right to left
and (if necessary) from bottom to top. Modules and WAN interface cards are identified by interface type,
slot number, followed by a forward slash
(/), and then the unit number; for example, Ethernet 0/0.
Note In the Cisco 3660 router, the fixed FastEthernet ports are located in chassis slot 0, and are identified by:
interface type chassis slot/ unit number
For example: FastEthernet 0/0
Figure1-9 shows a router with a 2E 2-slot module in slots 0 and 1. Two serial WAN interface cards are
installed in the module in slot 0. One serial and one ISDN BRI WAN interface card are installed in the
module in slot 1.
As shown in Figure1-9, the unit numbers are as follows:
• Slot 0, Ethernet interface 0, referred to as Ethernet 0/0
• Slot 0, Ethernet interface 1, referred to as Ethernet 0/1
• Slot 0, serial interface 0, referred to as serial0/0
• Slot 0, serial interface 1, referred to as serial0/1
• Slot 1, Ethernet interface 0, referred to as Ethernet 1/0
• Slot 1, Ethernet interface 1, referred to as Ethernet 1/1
• Slot 1, serial interface 0, referred to as serial1/0
• Slot 1, BRI interface 0, referred to as BRI 1/0
Note The 2E 2-slot module described in this example provides both an attachment unit interface (AUI) and
10BASE-T port. Only one of these ports can be used at a time. The module automatically detects which
port, AUI or 10BASE-T, is in use.
Cisco 3600 Series Routers Voice Interface Numbering
Voice interfaces are numbered differently from WAN interfaces described in the previous section,
“Cisco 3600 Series Router Unit Numbering.” Voice interfaces are numbered as follows:
interface type chassis slot/voice module slot/voice interface
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