TOPOLOGY

The IP network (Internet Protocol) of ANSP has a star topology. Its logical structure has been introduced at the PPTA - Academic Traffic Exchange Point section. In the PPTA there is no hierarchy among networks. Every institution and project that is part of ANSP and every network with which it directly exchanges traffic is treated in the same way, as an independent and autonomous network. For this, the BGP (Border Gateway Protocol) is used, which allows each participant to have complete freedom of choice of their topologies, internal protocols and network policies. And likewise, to have the freedom also to exchange traffic directly with another networks.

Naturally, the physical structure is quite different. The figure below shows the complete topology of the PTTA, with all its components. It can be seen that to achieve the logical simplicity presented in the figure, in addition to the PTTA, to which nineteen institutions are directly connected, ANSP maintains three points of concentration, in Campinas, where Unicamp and nine other institutions are connected, in São José dos Campos, where INPE and four more institutions are connected, and in São Paulo, where USP, the RNP PoP in São Paulo, and another fifteen institutions, are connected.

ANUARIO ANSP 2012 Cap 3 Fig 3-4 Diagrama fisico do PTTA-ANSP