2002 - cesnet
2002 - cesnet 2002 - cesnet
Ostrava, Plzeň, Liberec and České Budějovice. We also have one external collaboratorin Seattle (USA).In order to ensure effective collaboration in such a team, we have been organisingregular videoconferences, in addition to personal meetings and e-mail conferences.Videoconferences are very popular, even though we have to tacklesome technical problems arising, particularly, from the doubtful quality of theMBone videoconference applications. We are therefore looking intensively forother solutions that may be more reliable, easy to install and suitable also fordata circuits with a lower capacity.We have also been considering the possibility of applying other tools for thesupport of online collaboration and project coordination, e.g., the TUTOS 2 system.5.1.2 Involvement in 6NET ProjectSince early 2002, we have been in intensive negotiations with members of the6NET 3 consortium concerning our accession to the project. Due to the relativelytedious approval procedures, CESNET was officially adopted as a member ofthe consortium as of 1 September 2002.We make every effort in order to concentrate the operating capacity within the6NET project to a single task: development of an IPv6 router on a PC platform.This approach has proved to be perspective, as the consortium is now lookingfor a possible solution of the extensively fragmented capacities of individualpartners, which result in ambiguities concerning responsibilities.We also try to become involved in other activities of the 6NET project. Forinstance, we have contributed to the deliverable concerning the migration ofnational research networks.Beginning in 2003, CESNET will be connected to 6NET with a PoS STM-1(155 Mbps) circuit, which will be the very first Czech native (non-tunnel) internationallink of IPv6.5.2 IPv6 Network ArchitectureWithin the CESNET2 network, the IPv6 protocol is considered experimental andthe IPv6 backbone network is designed with the use of tunnels as an overlaynetwork above the IPv4 infrastructure. For details concerning the current situationof the network, visit http://www.cesnet.cz/ipv6/.2http://www.tutos.org/3http://www.6net.org/64 High-speed National Research Network and its New Applications 2002
5.2.1 IPv6 Network TopologyFor the scheme of the IPv6 backbone network by the end of 2002, including theinternational circuits, see Figure 5.1. Eight nodes of the CESNET2 network arelinked.The logical structure is formed by IPv6 tunnels over IPv4, which, however,copy to a maximum extent the physical topology of CESNET2. In most nodes,the IPv6 router is directly connected to the IPv4 backbone routers and tunnelsusually correspond to the physical circuits of CESNET2, leading from the nodein question. With this arrangement, the transition to an IPv4 and IPv6 network(with dual-stack routers) will be relatively easy – both IPv4 and IPv6 backbonerouters will merge.TeliaÚstí n. L.LiberecPrahaHradec KrálovéPlzeňASN-XS26-6COMOstravaGÉANT6NETČeské BudějoviceBrnoFigure 5.1: Scheme of the IPv6 backbone network topologyAnother principle of the designed topology of the IPv6 backbone network isbased on the requirement for a redundant linking of each backbone router.This is why there are two large circuits within the network: Prague–Plzeň–ČeskéBudějovice–Brno–Prague and Prague–Brno–Ostrava–Hradec Králové–Liberec–Prague, connected in Prague to two different routers, as indicated in Figure 5.1.Both Prague routers are also the terminal point of independent internationalcircuits, which means that even in case of a failure of one router, both internaland external connectivity is maintained.High-speed National Research Network and its New Applications 200265
- Page 13 and 14: men. We designed the basic concept
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- Page 55 and 56: Manufacturerwww.accton.comwww.actio
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Ostrava, Plzeň, Liberec and České Budějovice. We also have one external collaboratorin Seattle (USA).In order to ensure effective collaboration in such a team, we have been organisingregular videoconferences, in addition to personal meetings and e-mail conferences.Videoconferences are very popular, even though we have to tacklesome technical problems arising, particularly, from the doubtful quality of theMBone videoconference applications. We are therefore looking intensively forother solutions that may be more reliable, easy to install and suitable also fordata circuits with a lower capacity.We have also been considering the possibility of applying other tools for thesupport of online collaboration and project coordination, e.g., the TUTOS 2 system.5.1.2 Involvement in 6NET ProjectSince early <strong>2002</strong>, we have been in intensive negotiations with members of the6NET 3 consortium concerning our accession to the project. Due to the relativelytedious approval procedures, CESNET was officially adopted as a member ofthe consortium as of 1 September <strong>2002</strong>.We make every effort in order to concentrate the operating capacity within the6NET project to a single task: development of an IPv6 router on a PC platform.This approach has proved to be perspective, as the consortium is now lookingfor a possible solution of the extensively fragmented capacities of individualpartners, which result in ambiguities concerning responsibilities.We also try to become involved in other activities of the 6NET project. Forinstance, we have contributed to the deliverable concerning the migration ofnational research networks.Beginning in 2003, CESNET will be connected to 6NET with a PoS STM-1(155 Mbps) circuit, which will be the very first Czech native (non-tunnel) internationallink of IPv6.5.2 IPv6 Network ArchitectureWithin the CESNET2 network, the IPv6 protocol is considered experimental andthe IPv6 backbone network is designed with the use of tunnels as an overlaynetwork above the IPv4 infrastructure. For details concerning the current situationof the network, visit http://www.<strong>cesnet</strong>.cz/ipv6/.2http://www.tutos.org/3http://www.6net.org/64 High-speed National Research Network and its New Applications <strong>2002</strong>
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