Limited use of hosts at the TEN-155 backbone

As stated before in subsection 3.3 the information of workstations at the backbone of the TEN-155 network would be very valuable. On the other hand we understand very well that the extra capacity of these workstations for such tests is limited. Therefore, we would suggest a topology where each:

• Each NRN workstation is tested together with the TEN-155 workstation in the same country and with all other NRN workstation.
• Each TEN-155 workstation is tested together with the NRN workstation in the same country and with the TEN-155 workstations to which there are routes configured. Please note that in the setup, described in subsection 4.1, this implies that each UK, NL and DE workstation is tested with all others.

This setup is visualized in table 6.

 

Table: Proposed test scheme were each NRN (TEN) site executes performance tests with the other NRN (TEN) sites and with the local TEN (NRN) site. Note that `$\ast$' implies do a test and `-' implies skip the test.

With the scheme of table 6 each NRN or TEN workstation is tested together with three others. This means for each workstation a measurement time of 70 seconds. With periodic tests at each hour this is 1.9 % of each host. This is in our opinion still quite reasonable.