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ABSTRACT
Title: Multiple Routing Configuration
As the Internet takes an increasingly central role in our communications infrastructure, the slow convergence of routing protocols after a network failure becomes a growing problem. To assure fast recovery from page link and node failures in IP networks, we present a new recovery scheme called Multiple Routing Configurations (MRC). Our proposed scheme guarantees recovery in all single failure scenarios, using a single mechanism to handle both page link and node failures, and without knowing the root cause of the failure. MRC is strictly connectionless, and assumes only destination based hop-by-hop forwarding. MRC is based on keeping additional routing information in the routers, and allows packet forwarding to continue on an alternative output page link immediately after the detection of a failure. It can be implemented with only minor changes to existing solutions. In this paper we present MRC, and analyze its performance with respect to scalability, backup path lengths, and load distribution after a failure. We also show how an estimate of the traffic demands in the network can be used to improve the distribution of the recovered traffic, and thus reduce the chances of congestion when MRC is used.
1. INTRODUCTION
IN recent years the Internet has been transformed from a special purpose network to a ubiquitous platform for a wide range of everyday communication services. The demands on Internet reliability and availability have increased accordingly. A disruption of a page link in central parts of a network has the potential to affect hundreds of thousands of phone conversations or TCP connections, with obvious adverse effects.
The ability to recover from failures has always been a central design goal in the Internet [1]. IP networks are intrinsically robust, since IGP routing protocols like OSPF are designed to update the forwarding information based on the changed topology after a failure. This re-convergence assumes full distribution of the new page link state to all routers in the network domain. When the new state information is distributed, each router individually calculates new valid routing tables.
This network-wide IP re-convergence is a time consuming process, and a page link or node failure is typically followed by a period of routing instability. During this period, packets may be dropped due to invalid routes. This phenomenon has been studied in both IGP [2] and BGP context [3], and has an adverse effect on real-time applications [4]. Events leading to a re-convergence have been shown to occur frequently [5].
The IGP convergence process is slow because it is reactive and global. It reacts to a failure after it has happened, and it involves all the routers in the domain. In this paper we present a new scheme for handling page link and node failures in IP networks. Multiple outing Configurations (MRC) is a proactive and local protection mechanism that allows recovery in the range of milliseconds. MRC allows packet forwarding to continue over preconfigured alternative next-hops immediately after the detection of the failure. Using MRC as a first line of defense against network failures, the normal IP convergence process can be put on hold. This process is then initiated only as a consequence of non-transient failures. Since no global re-routing is performed, fast failure detection mechanisms like fast hellos or hardware alerts can be used to trigger MRC without compromising network stability [8]. MRC guarantees recovery from any single
link or node failure, which constitutes a large majority of the failures experienced in a network [7]. MRC makes no assumptions with respect to the root cause of failure, e.g., whether the packet forwarding is disrupted due to a failed page link or a failed router.
HARDWARE AND SOFTWARE SPECIFICATIONS
HARDWARE SPECIFICATION
The hardware used for the development of the project is:
Processor : Pentium Dual core
Ram : 1 GB
Monitor : 15” Color
Hard Disk : 80 GB
SOFTWARE REQUIREMENTS
The software used for the development of the project is:
Operating system : Windows family
Environment : Java
1.2. ORGANIZATION PROFILE
SOFTWARE SOLUTIONS
EdwareUK Pvt Ltd is an IT solution provider for a dynamic environment where business and technology strategies converge. Their approach focuses on new ways of business combining IT innovation and adoption while also leveraging an organization’s current IT assets. Their work with large global corporations and new products or services and to implement prudent business and technology strategies in today’s environment.
EdwareUK Pvt LTD ’S RANGE OF EXPERTISE INCLUDES:
• Software Development Services
• Engineering Services
• Systems Integration
• Customer Relationship Management
• Product Development
• Electronic Commerce
• Consulting
• IT Outsourcing
We apply technology with innovation and responsibility to achieve two broad objectives:
• Effectively address the business issues our customers face today.
• Generate new opportunities that will help them stay ahead in the future.
THIS APPROACH RESTS ON:
• A strategy where we architect, integrate and manage technology services and solutions - we call it AIM for success.
• A robust offshore development methodology and reduced demand on customer resources.
• A focus on the use of reusable frameworks to provide cost and times benefits.
They combine the best people, processes and technology to achieve excellent results - consistency. We offer customers the advantages of:
SPEED:
They understand the importance of timing, of getting there before the competition. A rich portfolio of reusable, modular frameworks helps jump-start projects. Tried and tested methodology ensures that we follow a predictable, low - risk path to achieve results. Our track record is testimony to complex projects delivered within and evens before schedule.