1. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 1 Panel discussion about networking architecture issues Dany.Vandromme@renater.fr www.renater.fr

2. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 2 DEDICATED vs SHARED Network configuration GRID interaction DEISA will be provided with an star OPN (VPN today) Future of HPC infrastructure should be a mix of core network and access infrastructure. With multiple connections to all HPC sites and not all of them on the core part!

3. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 3 DEDICATED vs SHARED Network configuration GRID interaction LHC (T0-T1 and T1-T1) will be provided with an OPN LHC (T1-T2) will used a shared resource, with dynamic services configuration (BoD) ==> EGEE Dedicated network (unique OPN) is the cheapest solution if there was a single pan-European project (LCG). Reality is not that, and not a technical optimum either (answer to Kors Bos!). eVLBI is using a VPN, and will migrate eventually towards an OPN in the future

4. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 4 Scalability Star topology is the initial sketch for all projects, which contradicts completely the grid spirit. Ideal full mesh topology is not scalable Star topology is not scalable either! (If it was, it should not be resilient) Internet model is the most scalable (made of core + access infrastructure) OPN must comply with this Central overall management is required. Shared AUP (CA at large) is required.

5. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 5 OVERLAP Grid community is discovering what telecommunications know and have been performing for long time already : 24/7, upgrade cost and complexity, interdomain and interoperability issues, monitoring, central management or standardization forces with operational interoperability of management, Security.

6. GRID@LARGE Workshop, Lisbon, 29-30 August 2005 6 ? Questions