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The POP to POP node pairs increased from September to October as we added 2 new POP nodes in each of Islamabad, Karachi and Lahore region. Figure 1 shows the increase in POP to POP node pairs. Throughput of POP to POP also increased over six months. Figure 2 shows the increase in POP to POP throughput from June to November. The black line shows the exponential increase trend line. It is observed that new POP nodes were added in three regions which already had one POP node each; resulting in high POP to POP throughput when the Node pairs are within the same region. As a result POP to POP throughput increased as shown in Figure 2.
Figure 1 | Figure 2 |
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Inter Region POP to POP Analysis
Overall POP to POP performance was affected by the RTTs. We analyze the average Round Trip Time (RTT) where we take the PERN node deployed at Fatima Jinnah Women University (FJWU) Islamabad as the monitoring node and all the other POP nodes as remote nodes that are being observed. Figure 1 shows the average RTT observed during the months September 2011 to November 2011. It can be observed that the tendency of the RTTs for various months intended for various cities remain identical with a very small variations. As an example, the average RTT observed form FJWU to Karachi HQ (green line with triangles) for the months September-November is 26.59ms, 25.22ms, and 25.14ms. The same tendency is also followed by the other remote sites. Giving a close look to RTTs, it is observed that:
- ISL HQ to Jamshoro Average RTT increased from 45ms in Sep to 91 ms in November. However, its min RTT reduced from 36.3ms in August to 26.8ms in September and remained almost same for the coming months. This increased Avg RTT resulted in reduced throughput.
- RTT for Karachi POPs is very stable throughout the analyzed months.
- The average RTT from FJWU to Quaid-e-Azam University, Islamabad (Islamabad-QAU) is very small (with an average of 0.91ms) compared to the other remote sites.
- A significant difference in average and Min RTTs is seen for KHI POP, Multan POP and Jamshoro POP. This can be seen in figure 3.
Figure 3: RTT, unreachability and Throughput to other POP nodes from ISL-FJWU POP node. Right axis is for throughput while left axis is for RTT(ms) and Unreachability (%). Green dot shows unreachability. Red line shows throughput, blue brick shows Average RTT while pink with bubbles show minimum RTT. |
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Packet loss and throughput from FJWU POP to other POPs is shown in the tables and average and Minimum RTT is shown in the graphs to identify the nodes with high RTTs.
Figure 4: Average RTT from ISL FJWU to Other POPs | Figure 5: Minimum RTT from ISL FJWU to Other POPs | Table1: Packet Loss ISL FJWU to Other POPs | Table 2: Throughput in Mbps from ISL FJWU to POPs |
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Intra Regional POP to POP Analysis
Islamabad, Lahore and Karachi regions have three POP nodes each. Intraregional analysis is therefore carried out on these regions. In the tables below, Intra-regional POP performances are evaluated. Each metirc is compared with itself throughout the table (within its column) and colored based on the comparative value. Green shows good values while red shows bad values. It is seen that
- ISL HQ to FJWU unreachability is 12.09% in October however, ISL FJWU to ISL HQ unreachability in October is 0 %. Similarly, it is seen that FJWU was unable to reach QAU in september for 74% of time however, QAU POP wasunable to reach FJWU 3.7% of time.
- HEC NOC to FJWU and QAU has different RTTs in forward and reverse direction.
- Karachi POP to POP RTT is same in forward and reverse directions however we see a difference in average RTT in Islamabad and Lahore region.