2002 - cesnet
2002 - cesnet 2002 - cesnet
5.2.2 Backbone RoutersWithin the IPv6 backbone network, we make use of the following router platforms:• PC with Linux (Prague, Ostrava, Plzeň, Č. Budějovice)• PC with NetBSD (Brno)• Cisco 3640, 7200 or 7500 (Prague, Liberec, Hradec Králové, Ústí nadLabem)PC-based routers utilize of the Zebra routing daemons. All routers are incorporatedin a unified authentication and authorization system, based on theTACACS+ protocol.5.2.3 AddressingIn 2001, CESNET obtained an address prefix (known as SubTLA) from RIPE2001:718::/35. Based on our request, this prefix was extended in 2002 to2001:718::/32. The prefix 3ffe:803d::/34, which we were using previously in our6Bone testing network, is no longer being used.Each of the nodes has been allocated a 42-bit prefix from the address area2001:718::/32 and from this, prefixes are allocated to end institutions, usually 48bits long. For the summary of allocated prefixes, see Table 5.1. This distributionis based on the previous prefix /35. With respect to its shortening to 32 bits, weare now considering the corresponding modification of its distribution to individualnodes.InstitutionPrefixCESNET, Prague 2001:718:1::/48Czech Technical University, Prague 2001:718:2::/48Masaryk University, Brno 2001:718:801::/48Brno University of Technology 2001:718:802::/48Technical University of Ostrava 2001:718:1001::/48Institute of Geonics CAS, Ostrava 2001:718:1002::/48SBU Silesian University, Karviná 2001:718:1003::/48Faculty of Pharmacy CU, Hradec Králové 2001:718:1201::/48TGM Hospital, Ústí n. L. 2001:718:1601::/48University of West Bohemia, Plzeň 2001:718:1801::/48Service for Schools, Plzeň 2001:718:1802::/48Technical University in Liberec2001:718:1C01::/48University of South Bohemia, Č. Budějovice 2001:718:1A01::/48Table 5.1: Allocated IPv6 prefixes66 High-speed National Research Network and its New Applications 2002
Missing in this list are especially universities and institutes of the Czech Academyof Science, connected through the Pasnet – Prague metropolitan network,which does not support IPv6. We have already initiated some negotiations and,hopefully in 2003, we will manage to connect these institutions through Pasnet.The prefix 2001:718::/48 has been reserved for the needs of backbone networkaddressing. Individual backbone connections are allocated networks withthe mask length of 64 bits. Loopback interfaces are addressed from the prefix2001:718::/64.5.2.4 Internal RoutingAs the interior routing protocol (IGP) we use RIPng combined with BGP. TheRIPng protocol is the only IGP supported for IPv6 by both platforms used inthe backbone network (Zebra and Cisco IOS). Its disadvantages (particularlythe slow convergence) are, to a great extent, eliminated by the method of use:RIPng is used only for propagating information about the reachability of thebackbone prefixes, while external networks are routed with the use of an internalBGP. In other words, RIPng serves only for the identification of the nexthop for BGP. Next year, we would like to test other alternative IGP’s whoseimplementations have lately appreared in the beta versions of Cisco IOS andZebra – OSPFv3 and IS-IS.The IBGP protocol is configured in the backbone network with the use of reflectorsaccording to [RFC2796] (BGP route reflector). Two reflectors are usedin order to ensure higher robustness – prg-v6-gw and r1-prg. Other backbonenetwork routers have BGP sessions only with these two reflectors.5.2.5 External ConnectivityThe exchange of routing information with neighbouring autonomous systems issubject to the rules of the 6NET network, enabling individual partners to informthe 6NET core about the prefixes of their own National Research and EducationNetwork (NREN), as well as the prefixes of other networks, with which NRENmaintains peering. Other partners can make use of the 6NET network transitfor their access to these external entities. However, two external entities cannotcommunicate with each other through 6NET.In order to implement these rules, 6NET uses the BGP community mechanism[RFC 1997] within its autonomous system 6680:High-speed National Research Network and its New Applications 200267
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5.2.2 Backbone RoutersWithin the IPv6 backbone network, we make use of the following router platforms:• PC with Linux (Prague, Ostrava, Plzeň, Č. Budějovice)• PC with NetBSD (Brno)• Cisco 3640, 7200 or 7500 (Prague, Liberec, Hradec Králové, Ústí nadLabem)PC-based routers utilize of the Zebra routing daemons. All routers are incorporatedin a unified authentication and authorization system, based on theTACACS+ protocol.5.2.3 AddressingIn 2001, CESNET obtained an address prefix (known as SubTLA) from RIPE2001:718::/35. Based on our request, this prefix was extended in <strong>2002</strong> to2001:718::/32. The prefix 3ffe:803d::/34, which we were using previously in our6Bone testing network, is no longer being used.Each of the nodes has been allocated a 42-bit prefix from the address area2001:718::/32 and from this, prefixes are allocated to end institutions, usually 48bits long. For the summary of allocated prefixes, see Table 5.1. This distributionis based on the previous prefix /35. With respect to its shortening to 32 bits, weare now considering the corresponding modification of its distribution to individualnodes.InstitutionPrefixCESNET, Prague 2001:718:1::/48Czech Technical University, Prague 2001:718:2::/48Masaryk University, Brno 2001:718:801::/48Brno University of Technology 2001:718:802::/48Technical University of Ostrava 2001:718:1001::/48Institute of Geonics CAS, Ostrava 2001:718:1002::/48SBU Silesian University, Karviná 2001:718:1003::/48Faculty of Pharmacy CU, Hradec Králové 2001:718:1201::/48TGM Hospital, Ústí n. L. 2001:718:1601::/48University of West Bohemia, Plzeň 2001:718:1801::/48Service for Schools, Plzeň 2001:718:1802::/48Technical University in Liberec2001:718:1C01::/48University of South Bohemia, Č. Budějovice 2001:718:1A01::/48Table 5.1: Allocated IPv6 prefixes66 High-speed National Research Network and its New Applications <strong>2002</strong>
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