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Campus Network Overview

Campus Network Overview. Carl Harris Associate Director, Research and Development Communications Network Services Virginia Tech. What is CNS?. Communications Network Services provides the following services to Virginia Tech faculty, staff, and students traditional telephone and voice-mail

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Campus Network Overview

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  1. Campus Network Overview Carl Harris Associate Director, Research and Development Communications Network Services Virginia Tech

  2. What is CNS? • Communications Network Services provides the following services to Virginia Tech faculty, staff, and students • traditional telephone and voice-mail • cable television (mostly residence halls) • IP/IPX/AppleTalk network layer and below • Exception: DNS and DHCP • Provide services on Blacksburg campus and at graduate centers around the state.

  3. Basic Link Layer Services • Basic Ethernet portal service • Switched 10Base-T (10 Mbit/s) • Some switched 100Base-TX (100 Mbit/s), but very expensive. • Dial-in modem pool with ~1,200 56K modems. • MSAP provides campus backbone access to local ISPs. • Ethernet in apartment complexes • ATM portal service for specialized applications (e.g. videoconferencing used in distance learning programs)

  4. Network Layer Architecture • IP routing • Within our autonomous system (AS): • OSPF plus some static routes • Extending beyond our (AS): • BGP4+ (a.k.a. MBGP) plus some static routes • In the modem pool:EIGRP (Cisco proprietary): fast convergence, low overhead, few knobs. Low CPU cost despite lots of link state changes. • Coming soon: • Multiprotocol Label Switching (MPLS, a.k.a. tag switching) to support certain kinds of policy routing • Packet prioritization and custom queuing disciplines to support apps with strict latency and loss requirements.

  5. Network Layer Architecture • IP multicast routing • Within our AS: • Protocol Independent Multicast, Sparse Mode (PIM-SM) between routers. • Internet Group Management Protocol (IGMPv2) manages multicast group membership to control distribution to hosts. • Extending beyond our AS: • PIM-SM • MBGP (multiprotocol, not multicast) • Multicast Source Discovery Protocol (MSDP) • A few legacy DVMRP tunnels

  6. Network Layer Architecture • IPX routing: IPX RIP, NLSP (similar to OSPF) • AppleTalk routing: who cares?

  7. Layer 1 and 2 Architecture • Primary switching facilities are located in: • Andrews Information Systems Building • Cassell Coliseum • Burruss Hall • Hillcrest Hall • Owens Hall • Shanks Hall • Use fiber-optics to interconnect switching facilities and to fan out to building backbones.

  8. Layer 1 and 2 Architecture • ATM backbone used as a “substrate” on which to build network layer services. • LAN Emulation (LANE) • Routers connect to ATM backbone and use LANE to establish virtual connections to each building subnet. LANE also used to interconnect the routers to form a network layer backbone. • Ethernet switches with LANE capability used in building backbones, ATM connection to campus backbone.

  9. Type III Building Network • Ethernet edge switches go in wiring closets located throughout the building • LANE connects the router (Cisco 7507) to the primary building switch (Catalyst 5000) via the ATM backbone switch. Catalyst 1924 Catalyst 1924 Catalyst 1924 Catalyst 1924 100Base-FX downlinks 10Base-T to wall portal Catalyst 1924 Cisco Catalyst 5000 FORE ASX-1000 Cisco 7507 ATM OC3c MDF

  10. VT ATM Backbone (since 1996) BUR Catalyst 5500 OC12c ATM (622 Mbit/s) OC3c ATM (155 Mbit/s) SHA Catalyst 5500 BUR Cisco 7507 HIL Catalyst 5000 BUR FORE ASX-1000 SHA Cisco 7507 Modem Pool HIL FORE ASX-1000 SHA FORE ASX-1000 HIL Cisco 7507 ISB Cisco 7507 OWE Catalyst 5000 ISB Catalyst 5500 OWE FORE ASX-1000 ISB Cisco 7507 OWE Cisco 7507 ISB FORE ASX-1000 ISB Cisco 7507 LMDS CAS Catalyst 5000 CAS FORE ASX-1000 xDSL Internet N.W.V T1/FR CAS Cisco 7507 Internet2 MSAP

  11. What Now? • Need low cost 10/100Base-TX portal service • Need to provide greater resiliency, lower latency, more bandwidth, and packet switching with differentiated QoS for next-generation applications • university administrators using desktop videoconferencing over IP • telephone services (voice-over-IP) • bandwidth killer applications (e.g. Napster) • Need architecture consist with high-bit-rate multicast (e.g. streaming HDTV via multicast).

  12. 2 x 100Base-FX building feed, no more ATM Simpler model. Low cost conversion Scalable building feed Type IV Building Network Catalyst 1924 Catalyst 1924 Catalyst 1924 Catalyst 1924 100Base-FX downlinks Catalyst 1924 10Base-T to wall portal Cisco Catalyst 5000 Cisco Catalyst 6509 2 x 100Base-FX MDF

  13. 10/100 to the desktop High capacity building concentrator switch. Scalable Gigabit Ethernet building backbone. Deployed in ACITC Type V Building Network Catalyst 3524 Catalyst 3524 1000Base-T4 interswitch links Catalyst 3524 Catalyst 3524 Catalyst 3524 Catalyst 3524 1000Base-SX downlinks Catalyst 3524 10/100Base-TX to wall portal Catalyst 3524 Cisco Catalyst 6509 Cisco Catalyst 6509 2 x 1000Base-LX MDF

  14. VT Gigabit Backbone (Fall 2000) BUR Catalyst 6509 2 x 1000Base-LX 1 x 1000Base-LX 1 x 1000Base-SX HIL Catalyst 6509 SHA Catalyst 6509 1 x 100Base-FX/TX ATM OC3c Future POS/DPT/ATM OC12c or 1000Base-ZX ISB Catalyst 6509 OWE Catalyst 6509 ISB Catalyst 6006 Modem Pool ISB Cisco 7507 CAS Catalyst 6509 ISB Cisco 7507 MSAP xDSL Internet VT ATM Backbone CAS Cisco 7507 T1/FR N.W.V Internet2 LMDS

  15. VT ATM Backbone (Fall 2000) ATM OC3c multi-mode ATM OC3c single-mode BUR ASX-200BX 1000Base-SX SHA ASX-200WG HIL ASX-200BX OWE ASX-200WG ISB ASX-1000 CAS ASX-200BX ISB Cisco 7507 N.W.V CAS Cisco 7507 VT Gigabit Backbone ISB Cisco 7507 Internet Internet2

  16. Net.Work.Virginia • Provides ATM services throughout Virginia to K-12 schools, institutions of higher education, and state agencies • low cost access with level pricing statewide • OC3c (155 Mbit/s), ~ $150,000/annum • DS3 (45 Mbit/s), ~$60,000/annum • DS1 (1.5 Mbit/s), ~12,000/annum • provides Internet access services, as well as supporting a wealth of ATM-based services (intranet, videoconferening, PSTN toll bypass, etc). • provides access to Internet2 backbones (Abilene, vBNS)

  17. For More Information • rdweb.cns.vt.edu • www.networkvirginia.net • www.internet2.edu • www.abilene.iu.edu

  18. Contact Info Carl Harris ceharris@vt.edu

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