A Fast Re-Route Method - IEEE Project 2014

A Fast Re-Route Method

                We present a method to find an alternate path, after a link failure, from a source node to a destination node, before the Interior Gateway Protocol (e.g., OSPF or IS-IS) has had a chance to reconverge in response to the failure. The target application is a small (up to tens of nodes) regional access subnetwork of a service provider’s network, which is a typical access scale encountered in practice. We illustrate the method and prove that it will find a path if one exists.

EXISTING SYSTEM

                 The existing system describes the concept of multipath routing from  the source to root within the network. It also have various techniques to handle  data loss, delayed timing, loss of  acknowledgement . but it did not describe how the packet to redirected once node within the path is unavailable or corrupted.

PROPOSED SYSTEM

        we present a method to find an alternate path, after a link failure, from a source node to a destination node. Since reconvergence of an Interior Gateway Protocol (IGP) (e.g., OSPF or IS-IS) can take hundreds of milliseconds, there is a need for a method that will find an alternate path in less time than this. The target application is a small (up to tens of nodes) access subnetwork of a service provider’s network, which is a typical scale encountered in practice; a service provider typically has many such small regional access networks.                      

          Consider a source node s sending data to destination node d. Suppose some link (i, j) on the shortest path from s to d fails. An IGP will find an alternate path from s to d that avoids (i, j) (assume such a path exists). However, IGP re-convergence may take hundreds of milliseconds or even seconds, and the packet loss during this time period may be unacceptable. Fast Re-Route (FRR) methods  establish a new path from s to d in much less time than required for IGP re-convergence.

MODULE DESCRIPTION:

Fast Reroute Method:

             We now present the details of the method. Let G = (N,A) be an undirected connected graph with node set N and arc set A. For x ∈ N, let N(x) be the set of neighbors of x, where a neighbor of x is a node one arc away from x. We associate with each undirected arc (i, j) ∈ A a cost c(i, j), and require each c(i, j) to be a positive integer. (The integer valued restriction can always be met by approximating, to the desired accuracy, each arc cost by an improper fraction, and then multiplying all the fractions by the least common multiple of the fraction denominators.) For i, j ∈ N, let c_(i, j) be the cost of the shortest path in G between i and j. When using Route(s, d) for fast re-route in the event of an arc failure, which is the target application, c_(i, j) represents the shortest path cost before the IGP has reconverged in response to the link failure.

Multipath Routing:

                         

                   Multipath routing is a promising routing scheme to accommodate these requirements by using multiple pairs of routes between a source and a destination. Multipath routing is the routing technique of using multiple alternative paths through a network, which can yield a variety of benefits such as increased bandwidth, or improved security. The multiple paths computed might be overlapped, edge-disjointed or node-disjointed with each other. Extensive research has been done on multipath routing techniques.

Failure Recovery:

                Techniques developed for fast recovery from single-link failures provide more than one forwarding edge to route a packet to a destination. Whenever the default forwarding edge fails or a packet is received from the node attached to the default forwarding edge for the destination, the packets are rerouted on the backup ports. In  the authors present a framework for IP fast reroute detailing three candidate solutions for IP fast reroute that have all gained considerable attention. when a forwarding link on a tree fails, the packet may be switched to the other tree.

System Configuration:-

H/W System Configuration:-

        Processor               -    Pentium –III

Speed                                -    1.1 Ghz

RAM                                 -    256  MB(min)

Hard Disk                          -   20 GB

Floppy Drive                     -    1.44 MB

Key Board                         -    Standard Windows Keyboard

Mouse                                -    Two or Three Button Mouse

Monitor                              -    SVGA

 

 S/W System Configuration:-

Operating System            :Windows XP

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