Nt1310 Unit 3 Network Analysis

According to the analysis of the Problem, Controllers have knowledge about their interdomain nodes and status links .Its avoid the loop in their domain and compute the optimized path for their domain but on the egress port and out from the domain it can’t compute the path.
We present the ALTP(Avoid loops with test packet) scheme to avoid that loops and packet drops in the whole network of SDN. We used the Test packets to check the status of the links between the two domains by using STP. It will select the optimal link among two domains before sending the data from Source to destination. We will discuss below that at which condition the test packet working is useful.
We don’t introduce the new data plane and break the concept of SDN and without the modification of switches. The ALTP is based on echo and reply packets. In the Fig.3 and fig.4, the Proposed Scheme will describe.
1. When the source will send the packets to destination if the destination will in different domain then controller send the test packet from their own domain to other domain for calculated the optimized whole path in the network.The Controller of the source domain will leave one inter-domain link
The metric path for test packet-2 Echo path is ACF and the reply is FCA. The test packet 1 and 2 is check from their latency delay. In that cases the test packets is used for both inter-domain links step by step. The controller will get the both test packets. it will store the value of both test packet response time in their data base. It will check the compare of both result if the test packet-1 response time is greater than the test packet-2 then the traffic of host-A will send through the link-2 or if the test-packet 2 response time will be greater than test packet-2 .The traffic will pass through the inter domain link-1. In this case the Test packet -2 response times is smaller than test packet-2. The host-traffic is send by