Cisco Systems 2600 manual Interface Numbering in Chassis with 1-RU Height

Chapter 1 Overview of Cisco 2600 Series Routers

Interface Numbering

Figure 1-11 Interface Numbering in Chassis with 1-RU Height

1 2

Figure 1-12shows a router of 2-RU height with:

•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—Fast Ethernet 0/0 and Fast Ethernet 0/1

•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)

–If physical slot W0 is empty and physical slot W1 contains a 1-port serial WIC, the interface number in the WIC is numbered Serial 0/0.

–If slot W0 contains a 2-port serial WIC and slot W1 contains a 1-port serial WIC, the interfaces in physical slot W0 are numbered Serial 0/0 and Serial 0/1, and the interface in physical slot W1 is numbered Serial 0/2.

–If slot W0 contains a 2-port serial WIC and slot W1 contains a 1-port BRI WIC, the interfaces in physical slot W0 are numbered Serial 0/0 and Serial 0/1, and the interface in physical slot W1 is numbered BRI 0/0.

Note The slot number for all WIC interfaces is always 0. (The W0 and W1 slot designations are for physical slot identification only.) Interfaces in the WICs are numbered from right to left, starting with 0/0 for each interface type, regardless of which physical slot the WICs are installed in.

Figure 1-12 Interface Numbering in Cisco 2691 Routers

Cisco 2600 Series Routers Hardware Installation Guide