Book Image

Implementing Cisco Networking Solutions

By : Harpreet Singh
5 (1)
Book Image

Implementing Cisco Networking Solutions

5 (1)
By: Harpreet Singh

Overview of this book

Most enterprises use Cisco networking equipment to design and implement their networks. However, some networks outperform networks in other enterprises in terms of performance and meeting new business demands, because they were designed with a visionary approach. The book starts by describing the various stages in the network lifecycle and covers the plan, build, and operate phases. It covers topics that will help network engineers capture requirements, choose the right technology, design and implement the network, and finally manage and operate the network. It divides the overall network into its constituents depending upon functionality, and describe the technologies used and the design considerations for each functional area. The areas covered include the campus wired network, wireless access network, WAN choices, datacenter technologies, and security technologies. It also discusses the need to identify business-critical applications on the network, and how to prioritize these applications by deploying QoS on the network. Each topic provides the technology choices, and the scenario, involved in choosing each technology, and provides configuration guidelines for configuring and implementing solutions in enterprise networks.
Table of Contents (12 chapters)

QoS in a hybrid model with service provider WAN

We have discussed the QoS requirements within the enterprise network. The enterprise network also spreads across the WAN, and the WAN can consist of dedicated TDM links, layer-2 links, or even layer-3 VPNs from the service provider.

If the organization's WAN is based on dedicated TDM circuits, there is no need for QoS on the SP backbone. However, if the organization takes a layer-3 VPN from the SP, the packets of the organization would be carried over the SP network that would also carry traffic from other organizations, and can be congested at times, as it is a shared infrastructure.

Hence the organization takes a layer-3 VPN from the SP, with quality of service enabled. This means that the SP would honour the QoS requirements of the organization. Since the SP network has a uniform QoS marking design for its network that is...