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Hardware Installation Guide for the Cisco 4000 Series Integrated Services Router
OL-32185-02
Chapter 1 Overview of Cisco 4000 Series ISRs
Slots, Subslots (Bay), Ports, and Interfaces in Cisco 4000 Series ISRs
In most cases, the router designates its interfaces using a 3-tuple notation that lists the slot, bay, and port.
The 3-tuple value is zero based. An example of a 3-tuple is 0/1/2. This refers to slot 0, the second bay in
slot 0 (the first bay is 0 so the second bay is 1), and the third port in bay 1. See Table 1-6 for more
examples.
Table 1-6 Slot, Subslot (Bay) and Port Numbering
•
Slots and bays are numbered from the left to the right, and from the top to the bottom.
• The auxiliary (AUX) serial port and console (CON) serial port do not have slot, bay, or port
numbers.
• The GE management port is named GE 0 and has a port number. It does not have a slot or bay
number.
• The two USB ports are named USB0 and USB1. They do not have slot or bay numbers. Cisco 4331
ISR and Cisco 4321 ISR have only one USB port.
Note USB0 and USB1 can be used to insert flash drives.
Figure 1-30 shows the ports and slots on Cisco 4451 ISRs.
Figure 1-30 Ports and Slots on the Cisco 4451 ISRs
3-Tuple Example Slot Bay Port
0/1/2 0 2nd 3rd
0/0/1 0 1st 2nd
1/1/1 1 2nd 2nd
1 Gigabit Ethernet management port 2 USB port 0
3 USB Type B mini port 4 Auxiliary port
5 RJ-45 Gigabit Ethernet port (GE 0/0/0) 6 Small-form-factor pluggable (SFP)
0/Gigabit Ethernet port (GE 0/0/0)
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1 3
2
4 5 6 7 8
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