Chapter 1 Overview of Cisco 3600 Series Routers

Interface Numbering

Cisco 3660 Interfaces

Each individual network interface on a Cisco 3600 series router is identified by a slot number and port number.

Slot Numbering

The Cisco 3660 router chassis has six network module slots. Each network module slot accepts a variety of network module interface cards, supporting a variety of LAN and WAN technologies. Figure 1-9shows the locations of the network module slots.

Figure 1-9 Cisco 3660 Slot Numbers

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Slot 6

 

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82775

Modules and WAN interface cards are identified by interface type, slot number, followed by a forward slash (/), and then the port number; for example, Ethernet 0/0.

Slot 0 contains fixed Fast Ethernet ports and is located at the top of the chassis.

Slot 1 through Slot 6 accept up to six network modules.

Port numbers usually begin at 0 for each interface slot, and continue from right to left and, if necessary, from bottom to top. However, interface numbering for the Cisco 3660 series routers and for Ethernet and Token Ring network modules with two WAN interface card slots differs in the following ways:

WAN interface card slot numbers always appear as slot 0, even if the interface card is installed in the slot labeled W1.

WAN interface cards are numbered dynamically, starting with the first card installed. For example:

If slot W0 is empty and slot W1 contains a 1-port serial WAN interface card, the interface number would be serial 0/0.

If slot W0 contains a 2-port serial WAN interface card and slot W1 contains a 1-port serial interface card, serial 0/0 and 0/1 would reside in slot W0 and serial 0/2 would reside in slot W1.

Cisco 3600 Series Routers Hardware Installation Guide

 

OL-2056-05

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Cisco Systems Cisco 3600 manual Cisco 3660 Interfaces, Cisco 3660 Slot Numbers