Cisco Systems 3725, 831, 3745, 1751 manual Overview, Prerequisites, Limitations

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SOLUTION OVERVIEW

CONFIGURING DYNAMIC MULTIPOINT VPN

WITH ON-DEMAND ROUTING

OVERVIEW

This document provides a sample configuration for configuring On-Demand Routing (ODR) with Dynamic Multipoint VPN (DMVPN) in hub to spoke configuration. The DMVPN feature simplifies the hub router IPsec configuration and supports dynamic IP addresses at the spoke router. DMVPN combines Generic Routing Encapsulation (GRE) tunnels, IPsec encryption, and Next Hop Resolution Protocol (NHRP). It provides IP routing for remote sites, while minimizing the overhead on the network devices. This sample configuration also allows load balancing with dual ODR hub routers, failover to a single hub when a hub router fails, and the recovery from a hub router failure when it is recovered.

Figure 1. Network Diagram

PREREQUISITES

The sample configuration is based on the following assumptions:

Public IP addresses for the hub routers (10.0.149.221 and 10.0.149.220)

DMVPN network for tunnel interface on both hubs are 192.168.1.0/24 and 192.168.2.0/24

Spoke router can use static IP or dynamic IP addresses

Example uses Enhanced Interior Gateway Routing Protocol (EIGRP) as its dynamic routing protocol

Example uses pre-shared keys for authentication

Disabled split tunneling for the spoke router; this allows the Internet traffic to go through the hub only

LIMITATIONS

This guide provides the DMPVN configuration, but does not cover the following configuration:

Full router security audit: run a Security Device Manager (SDM) security audit in the wizard mode to lock down and secure the router.

Initial router configuration step: full configuration is shown in the following section.

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Contents Prerequisites OverviewLimitations Components PrecautionsFollowing are the configurations on the Hub router Configuration of the Cisco 3725 RouterPage Normal Operation Verifying the Cisco 3725 Router ResultsC3725-21#show ip protocols Routing Protocol is nhrp Current configuration Version Configuration of the Cisco 1751 Spoke RouterPage Verifying the Cisco 1751 Spoke Router Results Page EIGRP, EX-EIGRP Configuration of the Other RoutersPage Cisco 831 Router Configuration Page Related Information USA

1751, 3745, 3725, 831 specifications

Cisco Systems has established itself as a leader in networking and communications technologies, providing an extensive range of products that cater to various needs in the digital landscape. Among its noteworthy offerings are the Cisco 1751, 831, 3745, and 3725 routers, each designed to address specific requirements within business environments, from small offices to larger enterprises.

The Cisco 1751 is a modular router that delivers high-performance routing capabilities for small to medium-sized businesses. It features two slots for WAN interface cards, which provide flexibility in connectivity options. With support for both digital and analog connections, the 1751 is ideal for organizations looking to integrate voice and data services over a single network. Furthermore, it comes equipped with Cisco's IOS software, offering robust security features and advanced routing protocols, ensuring reliable performance.

The Cisco 831 router is designed to provide small branch offices with a reliable and secure Internet connection. This device incorporates an integrated firewall, VPN support, and advanced security features, making it an excellent choice for businesses that prioritize data protection. The 831 supports various WAN technologies, including DSL and cable, empowering organizations to select the most suitable connectivity type for their operations.

On a larger scale, the Cisco 3745 router is tailored for medium to large enterprises seeking high-capacity routing solutions. With its high performance and support for numerous interfaces, the 3745 can manage substantial data traffic efficiently. Key features include integrated voice support, which allows for convergence of voice and data applications, and advanced QoS capabilities, ensuring that critical applications receive the necessary bandwidth and priority.

Lastly, the Cisco 3725 serves as another powerful option for organizations needing flexibility and performance. Similar to the 3745, it supports modular WAN interfaces and offers compatibility with various data and voice technologies. The 3725's enhanced memory and processing capabilities allow it to handle demanding applications, making it suitable for larger networks requiring reliable connectivity and security features.

In conclusion, Cisco Systems' 1751, 831, 3745, and 3725 routers are exceptional networking solutions tailored for different business sizes and demands. Each model boasts specific features designed to enhance performance, security, and scalability, thereby empowering organizations to optimize their digital infrastructures in an increasingly interconnected world.