Cisco 3725 Software Configuration Guide - Page 29

Chapter 1 Understanding Interface Numbering and Cisco IOS Software Basics Understanding Interface Numbering If you have a 4-channel voice network module installed in slot 1 of your router, the voice interfaces will be: • Slot 1, voice network module slot 0, voice interface 0, referred to as voice 1/0/0 (closest to chassis slot 0) • Slot 1, voice network module slot 0, voice interface 1, referred to as voice 1/0/1 • Slot 1, voice network module slot 1, voice interface 0, referred to as voice 1/1/0 • Slot 1, voice network module slot 1, voice interface 1, referred to as voice 1/1/1 (farthest from chassis slot 0) Figure 1-9 Cisco 3600 Series Unit Numbers Cisco 3700 Series Interface Numbering Each WAN and LAN interface on a Cisco 3700 series router is identified by a slot number and a unit number. The Cisco 3700 series includes the Cisco 3725 and Cisco 3745. Cisco 3725 Router Interface Numbering The Cisco 3725 router chassis contains the following wide-area network (WAN) and local area network (LAN) interface types: • Two built-in FastEthernet LAN interfaces • Three slots in which you can install WAN interface cards (WICs) • One single-width slot (slot 1) in which you can install one network module • One double-width slot (slot 2) in which you can install one single-width or double-width network module Cisco 3725 Router Slot Numbering The numbering format is Interface-type Slot-number/Interface-number. Two examples are: FastEthernet 0/0 Serial 1/2. The slot numbers are as follows: • 0 for all built-in interfaces • 0 for all WIC interfaces OL-1957-04 Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers 1-9