Cisco 2691 - VPN Bundle Router Hardware Installation Manual page 30

Interface Numbering
Figure 1-11 Interface Numbering in Chassis with 1-RU Height
Figure 1-12
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A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0 and T1 1/1)
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Two built-in Ethernet 10/100 interfaces—Fast Ethernet 0/0 and Fast Ethernet 0/1
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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)
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Note
Figure 1-12 Interface Numbering in Cisco 2691 Routers
Cisco 2600 Series Routers Hardware Installation Guide
1-10
shows a router of 2-RU height with:
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.
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.
Chapter 1 Overview of Cisco 2600 Series Routers
OL-2171-06