Chapter 1 Overview of Cisco 3700 Series Routers

Interface Numbering

Interface Numbering

This section describes numbering conventions for interfaces on Cisco 3725 and Cisco 3745 routers.

Cisco 3725 Interfaces

Each individual interface (port) on a Cisco 3725 router is identified by number, as described in the following sections.

WAN and LAN Interface Numbering

The Cisco 3725 router chassis contains the following WAN and LAN interface types:

Two built-in Fast Ethernet LAN interfaces

Three slots in which you can install WAN interface cards (WICs)

One single-wide slot (slot 1) in which you can install one network module

One double-wide slot (slot 2) in which you can install one single-wide or double-wide network module

The numbering format is interface-typeslot-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

1 for interfaces in the single-wide network module slot

2 for interfaces in the double-wide network module slot

Interface (port) numbers begin at 0 for each interface type, and continue from right to left and (if necessary) from bottom to top.

Figure 1-3shows an example of interface numbering on a Cisco 3725 router with these interfaces:

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)

A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0 and T1 1/1)

A 36-port EtherSwitch network module in slot 2 (containing the following ports: Fast Ethernet 2/0 through 2/35, and Gigabit Ethernet 2/0 and 2/1)

Two built-in Ethernet 10/100-Mbps interfaces—Fast Ethernet 0/0 and Fast Ethernet 0/1

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Cisco Systems 3700 Series manual Cisco 3725 Interfaces, WAN and LAN Interface Numbering

3700 Series specifications

Cisco Systems 3700 Series routers are a pivotal part of Cisco's portfolio, designed for medium to large enterprises aiming to deliver secure and efficient networking capabilities. Introduced as a versatile solution, these routers provide a comprehensive blend of performance, scalability, and investment protection.

One of the standout features of the Cisco 3700 Series is its modular architecture, allowing organizations to customize their router according to specific needs. This modularity supports various modules for different functions, including voice, data, and video, making the 3700 Series an ideal choice for converged networking environments. Administrators can enhance functionality through an array of WAN and voice interface cards that adapt as the organization's needs evolve.

The 3700 Series is built on Cisco's IOS (Internetwork Operating System), ensuring robust and high-quality performance. It supports advanced routing protocols including EIGRP, OSPF, and BGP, facilitating efficient data transmission across diverse environments. This versatility helps organizations implement sophisticated multi-site connectivity and enables reliable performance in complex network scenarios.

Security is a paramount concern in modern networking, and the Cisco 3700 Series delivers with features such as integrated firewall services, VPN support, and intrusion detection capabilities. These security measures protect sensitive data and ensure secure communication between remote sites—critical in today’s cyber landscape.

Another key characteristic of the 3700 Series is its support for Quality of Service (QoS), which prioritizes time-sensitive traffic such as voice and video. By ensuring that critical applications receive the bandwidth they require, organizations can maintain the quality of service that their users expect.

Moreover, the Cisco 3700 Series is designed with redundancy in mind. Features like dual power supplies and hot-swappable fan trays enhance reliability and uptime, which are crucial for mission-critical applications.

Furthermore, energy efficiency is an increasingly important consideration in network design. The Cisco 3700 Series adheres to modern energy standards, helping reduce the overall carbon footprint while supporting high-performance capabilities.

In summary, the Cisco Systems 3700 Series routers stand out for their modularity, advanced routing capabilities, robust security features, and energy efficiency, making them an optimal choice for enterprises that not only need performance but also flexibility and reliability in their networking solutions. As businesses continue to evolve and adapt, the Cisco 3700 Series is a dependable partner in their connectivity journey, ensuring they can meet current demands while preparing for future challenges.