1-3
Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Chapter 1
Understanding Interface Numbering and Cisco IOS Software Basics
Understanding Interface Numbering
Figure 1-1
Example of 1RU Router
Figure 1-2
below shows a router of 2 RU height with:
•
A WIC in each WIC slot (containing interfaces Serial 0/0 and Serial 0/1 in physical slot W0,
interface Serial 0/2 in physical slot W1, and interface BRI 0/0 in physical slot W2)
•
A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0 and T1 1/1)
•
Two built-in Ethernet 10/100 interfaces—FastEthernet 0/0 and FastEthernet 0/1
Figure 1-2
Example of a 2RU Router
28308
Cisco 2612
100-240V– 1A
50/60 Hz 47 W
Serial 1/0
Serial 1/2
Serial 1/1
Serial 1/3
W1
CN/LP
2
1
0
3
RXC RXD
TXC
TXD
CN/LP RX
C
RXD
TXC
TXD
CN/LP RX
C
RXD
TXC
TXD
CN/LP RX
C
RXD
TXC
TXD
EN
SERIAL
A/S
W0
SERIAL
CONN
W0
SERIAL
CONN
AUX
CONSOLE
ETHERNET 0/0
ACT
LINK
ACT
TOKEN RING 0/0
LINK
W0
Ethernet
0/0
Auxiliary
port
Console
port
Ethernet 0/1
Serial 0/0
Serial 0/1
BANK 4
BA
NM-HDV