1-6
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 1-6
Cisco 3631 Router Rear View
For the Cisco 3660 router (see
Figure 1-3
), the slots are numbered as follows:
•
Slot 0 contains fixed FastEthernet ports and is located at the top of the chassis.
•
Slot 1 is at the bottom right (as viewed from the rear of the chassis), near the power supply.
•
Slot 2 is at the bottom left.
•
Slot 3 is at the right, above slot 1.
•
Slot 4 is at the left, above slot 2
•
Slot 5 is at the right, above slot 3.
•
Slot 6 is at the left, above slot 4.
For the Cisco 3620 and Cisco 3640 routers shown in
Figure 1-4
and
Figure 1-5
, the slots are numbered
as follows:
•
Slot 0 is at the bottom right (as viewed from the rear of the chassis), near the power supply.
•
Slot 1 is at the bottom left.
•
Slot 2 is at the top right, above slot 0.
•
Slot 3 is at the top left, above slot 1.
For the Cisco 3631 router shown in
Figure 1-6
, the slots are numbered as follows:
•
Slot 0 for all built-in interfaces like the FastEthernet port at the bottom center near the Console/AUX
ports
•
Slot 0 for all WAN interface card (WIC) interfaces
•
Slot 1 for network module interfaces at the bottom left.
•
Slot 2 for network module interfaces at the top left, above slot 1.
68501
SEE MANUAL
BEFORE INS
TALLATION
AL
CD
LP
RD
TD
SEE MANUAL
BEFORE INS
TALLATION
DSU
56K
EN
AIC-64
CONN 2
STAT
CONN 4
CONN 1
CONN 3
EN
ASYNC
ASYNC 8-15
ASYNC 0-7
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ASYNC 24-31
ASYNC 16-23
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
W1
Slot 2
W0
Console/AUX
ports
FastEthernet 0/0
Slot 1
