# Disjoint Path Algorithm for Load Balancing in MPLS network

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3 Sourabh Kamble and V.M. Aranke EXPLANATION WITH EXAMPLE Consider the IP topology as shown in figure 2, where the circular shape represents IP nodes and all links is having bandwidth of 2Mbps and delay of 10ms. There are two request- request 1 and request 2 from IP(1) to IP(3) and IP(2) to IP(4) each having bandwidth of 1.5Mbps respectively. Figure 1: IP Network Topology In conventional IP routing, flow 1 corresponding to request 1- will follow the route and flow 2 corresponding to request 2- will follow the route , by Shortest Path Algorithm leading to congestion in common path as the capacity requirement of two flows is 3Mbps while the links are of bandwidth 2Mbps each(0-1, 1-2, 2-8). As a result buffer at node 0 will overflow dropping the packets from tail at node 0 as shown in figure 4. Now consider MPLS network where backbone domain is MPLS to which IP network is connected, as shown in figure 3. Here to distinguish from traditional IP network MPLS nodes ate represented in Square shape. Each MPLS node is deployed Label Switched Router (LSR) having all other consideration same as IP network. Figure 3: MPLS Network Topology Now we apply DPA, which makes use of explicit routing technology of MPLS network to avoid congestion. DPA is applies only in MPLS domain. In DPA first we will calculate the shortest path for two requests i.e. for request 1 it is and for request 2 it is Considering node as distance metric, it is clear from the path that shortest path for flow 1 is shorter than that of shortest path for flow 2.Thus calculating Disjoint Path for request 2 will be more advantageous than for request 1.hecne DPA will find disjoint pat for request 2 which is Though this path is somewhat longer than the shortest path for request 2, it is more reliable than shortest path avoiding congestion as shown in figure 5. ISSN : Vol. 13 No. 1, Jan

4 Disjoint Path Algorithm for Load Balancing in MPLS network thus by using explicit routing of MPLS network flow 2 is routed along the path avoiding congestion and increasing overall performance of network. SIMULATION RESULT An open source network simulator (NS-2.34) is used for simulation. Figure 2 and figure 3 shows the network topologies for simulation. Graphs are drawn showing the effectiveness of DPA over SPF from the trace file generated using simulator. Characteristics of flow 1 by shortest path are compared with characteristics of flow 1 by DPA. Results for flow 2 can also be compared but results of flow 1 are sufficient to provide the efficiency and feasibility of DPA over SPF. Figure 4 shows the Packet dropping in SPF routing when traditional IP network is used. At node 0, demand of capacity for forwarding link sharing common path will be 3Mbps (Flow1-1.5Mps + Flow2-1.5Mbps). But as bandwidth of each link is 2Mbps only, the buffer at node 0 will overflow dropping the packets. Figure 4: Dropping of Packet in SPF Routing Figure 5 shows the avoidance of congestion by using DPA in MPLS based network, leading to no packet drop in the network. Figure 6 shows the graph for packet drop rate for DPA and SPF, it is clear from graph that there is no packet drop since we apply DPA. Figure 5: Zero packet drop after application of DPA ISSN : Vol. 13 No. 1, Jan

5 Sourabh Kamble and V.M. Aranke Figure 6: Graph for Packet drop rate Figure 7 shows the throughput comparison of traditional IP routing using SPF and explicit routing in MPLS using DPA. Throughput is calculated at node 11 i.e. IP (3). Graph shows that there is considerable increase in throughput after applying DPA. SPF throughput is less than DPA as packets are dropped due to congestion. Figure 7: Graph for Throughput Figure 8 shows end to end packet delay for flow 1.It is clear from the graph that packet delay increases first and after applying DPA it stabilises around 60ms. There is a steady flow as packet arrival time variation is zero leading to constant end to end delay. Thus DPA leads to reduction in end to end delay and data transmission avoiding congestion. ISSN : Vol. 13 No. 1, Jan

6 Disjoint Path Algorithm for Load Balancing in MPLS network Figure 8: Graph for End-to-End Packet Delay Table 1 shows the statistical comparison of both the algorithm, which in turn state the delay reduction efficiency and throughput efficiency of DPA is 62% and 33% respectively over SPF. Thus DPA considerably improves network performance and quality of service by reducing end to end delay, packet drop rate and improves throughput Table 1: Statistical comparison of both Algorithm Routing Algorithm Parameter Number of Packet Dropped Average End-to-End packet Delay (in ms) Average Throughput (in Kbps) Disjoint Path Algorithm Shortest Path First Efficiency of DPA (%) CONCLUSION In this paper we discuss bottleneck in conventional IP routing algorithms and discuss the importance of traffic engineering. How MPLS effectively support TE. Then we presented the concept of DPA and implemented it in NS2 for simulation of path computational algorithm in MPLS network. From Simulation and results it is clear that he proposed algorithm addresses the shortcoming of currently used SPF algorithm and seeks to balance the load on the network avoiding congestion and better resource utilization improving network performance. ISSN : Vol. 13 No. 1, Jan

7 Sourabh Kamble and V.M. Aranke REFERENCES [1] D. Awduche, J. Malcolm, J. Agogbua, M. O Dell and J. McManus, Requirements for Traffic Engineering Over MPLS, RFC2702, IETF, September [2] Fenglin Li and Jianxun Chen, MPLS Traffic Engineering Load Balance Algorithm Using Deviation Path, International Conference on Computer Science and Service System, 2012 IEEE, pp [3] C. Semeria, Traffic Engineering For The New Public Network, Juniper Networks Whitepaper, September [4] B. sfortz, J. Rexford, and M. Thorup, Traffic Engineering with Traditional IP Routing Protocols, IEEE Communication Magazine, October [5] Xipeng Xiao, Alan Hannan, Brook Bailey and Lionel Ni, Traffic Engineering with MPLS in the Internet, IEEE Network, [6] Keping Long, Zhongshan Zhang and Shiduan Cheng, Load balancing algorithms in MPLS traffic engineering, In 2001 IEEE Workshop on High Performance Switching and Routing, 2001, pp ISSN : Vol. 13 No. 1, Jan

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