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Trinet

the Otaniemi campus student network founded in 1986

Trinet Network Technology

General

The Trinet network is almost entirely based on Ethernet technology, excluding the AYY offices at Töölö and Arabia campuses which are currently implemented with DSL connections. The Trinet backbone and Internet connections were upgraded to 10 Gbps during 2009 and 2010. The remaining part of the network uses 1-10 Gbps links for switch-to-switch connections. When the ongoing 1 Gbps access connectivity upgrade goes further, all switch links will be upgraded either to 10 Gbps (non-protected core access) or to 10+10 Gbps (protected core access).

The network topology is visualized in the Trinet weathermap.

Routers

Trinet has two Cisco Catalyst 6500 Sup720-3BXL series routers, which provide IPv4 and IPv6 routing for the whole network and backbone connectivity for the 1 Gbps edge switch links. Both routers have their own 10 Gbps Funet connection, and routers themselves have been linked with 20 Gbps. The first 10 Gbps connection to the Funet Espoo router is a normal 10 GbE optical link. The second 10 Gbps connection to the Funet Helsinki router is carried over the Funet optical network.

The theoretical total forwarding capacity for the each Trinet router, with the current configuration, is around 78 Mpps ie. 53 Gbps for IPv4 and 39 Mpps ie. 27 Gbps for IPv6 with a minimum Ethernet frame size.

Current sites and edge switches

The Trinet network base on switches from multiple generations, with the oldest originating from the late 1990s. Especially the older switches do not allow all modern services and protections to be used, most prominently IPv6 multicast. Please refer to the following table if you are interested in the current situation in the apartment buildings or in the AYY offices.

LocationSwitchesUser AccessTowards BackboneMTUDHCP FilteringRA/DHCPv6 FilteringIPv4 MulticastIPv6 Multicast1 Gbps Schedule
AYYJämeräntaival 12 * Cisco Catalyst 4506-E1 Gbps20+20 Gbps9000XXXX
AYYJämeräntaival 31 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYJämeräntaival 51 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYJämeräntaival 61 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYJämeräntaival 7 A1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYJämeräntaival 7 B1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYJämeräntaival 7 C1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASJämeräntaival 91 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASJämeräntaival 10 A-B1 * HP ProCurve 2650100 Mbps1 Gbps1500X X TBD
HOASJämeräntaival 10 C-D1 * HP ProCurve 2650100 Mbps1 Gbps1500X X TBD
HOASJämeräntaival 10 E-F1 * HP ProCurve 2650100 Mbps1 Gbps1500X X TBD
HOASJämeräntaival 10 G1 * HP ProCurve 2650100 Mbps1 Gbps1500X X H2 / 2017
HOASJämeräntaival 10 H1 * HP ProCurve 2650100 Mbps1 Gbps1500X X H2 / 2017
HOASJämeräntaival 11 A-B1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASJämeräntaival 11 C1 * HP ProCurve 2650100 Mbps1 Gbps1500X X 1 / 2018
HOASJämeräntaival 11 D1 * HP ProCurve 2650100 Mbps1 Gbps1500X X 1 / 2018
HOASJämeräntaival 11 E-I5 * HP ProCurve 2650100 Mbps1 Gbps1500X X 3-8 / 2018
HOASJämeräntaival 11 J-M4 * HP ProCurve 2650100 Mbps1 Gbps1500X X 9-12 / 2018
AYYOtakaari 18 A1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtakaari 18 B-C1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtakaari 201 * HP ProCurve 5406R1 Gbps10+10 Gbps9000XXXX
AYYOtaranta 8 A1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtaranta 8 B1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtaranta 8 C1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtaranta 8 D1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYOtaranta 8 E1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYServinkuja 11 * HP ProCurve 5412zl1 Gbps10+10 Gbps9000XXXX
OASServinkuja 2 A-C1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
OASServinkuja 2 D-F1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASServinkuja 5 A1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASServinkuja 5 B1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASServinkuja 61 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
OASServin Maijan tie 11 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
HOASServin Maijan tie 31 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYServin Maijan tie 6 A-C1 * Juniper EX42001 Gbps10+10 Gbps9000XXX
AYYServin Maijan tie 6 D-G1 * Cisco Catalyst 4506-E1 Gbps10+10 Gbps9000XXXX
AYYServin Maijan tie 101 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYServin Maijan tie 12 A-F1 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYServin Maijan tie 12 G-K1 * Juniper EX62101 Gbps10+10 Gbps9000XXX
AYYAtlantinkatu 72 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXX
AYYRummunlyöjänkatu 11 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXX
AYYRummunlyöjänkatu 31 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXX
AYYVaasankatu 101 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXX
Rantasauna1 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXX
Servin Mökki1 * HP ProCurve 2920-48G1 Gbps10 Gbps9000XXXX
TF Otakaari 221 * Juniper EX42001 Gbps10+10 Gbps9000XXX
TF Otakaari 221 * HP ProCurve 2626100 Mbps1 Gbps1500X X  
TF Otakaari 223 * HP ProCurve 2650100 Mbps1 Gbps1500X X  
AYY Otakaari 114 * HP ProCurve 2910al1 Gbps10 Gbps9000XXXX

Future sites

The following sites are planned to be connected to the Trinet network in the near future.

LocationSwitchesUser AccessTowards BackboneMTUDHCP FilteringRA/DHCPv6 FilteringIPv4 MulticastIPv6 MulticastSchedule
AYYArkadiankatu 281 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYHaarniskatie 81 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYKaj Franckin katu 41 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYKirkonkyläntie 161 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYKääpiöidenpolku 41 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYMäyrätie 11 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYPohjavedenkatu 41 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYRuusulankatu 51 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYTuhkimontie 21 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017
AYYTurkismiehentie 81 * Cisco Catalyst 4506-E1 Gbps10 Gbps9000XXXXH2 / 2017

Unicast and Multicast Routing

Border Gateway Protocol (BGP) is in use for both IPv4 unicast/multicast and IPv6 unicast/multicast routing. To decrease Internet connectivity convergation delay in case of a link failure, Bidirectional Forwarding Detection (BFD) is utilized with IPv4 BGP to detect a link failure on a sub-second time scale. Internal Gateway Protocols (IGP), namely, Open Shortest Path First (OSPF) and OSPFv3, are in place to establish connectivity between the Trinet routers by advertising the loopbacks and the link networks. The second important task for the IGP routes is to provide BGP next-hop reachability. Otherwise BGP carries all external and internal route information.

Both Funet uplinks are normally in use as the same BGP metric is used in the both links. The model is called "hot-potato" aka closest-exit routing. Trinet subnetworks have been divided between the routers to allow better load balancing on the uplinks and to provide more than 10 Gbps usable bandwidth to the Internet.

Multicast routing uses Protocol Independent Multicast - Sparse-Mode (PIM-SM) and PIM - Source-Specific Multicast (PIM-SSM) in addition to Multicast Source Discovery Protocol (MSDP), which enables inter-domain IPv4 multicast.

Customer Access

Trinet utilizes Hot Standby Router Protocol (HSRP) on the direction of the customer networks. Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) is used with IPv4 and IPv6 multicast, respectively. However, IPv6 multicast is enabled only within the switches offering 1 Gbps user access connectivity. In addition, the new 1 Gbps switches enable use of jumbo frames ie. packets with Maximum Transfer Unit (MTU) up to 9000 bytes. The Trinet backbone, Funet links and a majority of AYY services also support jumbo frames, and the support will be extended to the remaining services in the future.

User IP address configurations are delivered by Dynamic Host Configuration Protocol (DHCP) in IPv4 and by stateless address autoconfiguration in IPv6.

Trinet security and filtering policies are described in the Usage Policy.

© 2017 Veijo Kyläverkko <verkko@ayy.fi>
Last updated: 2017-10-14