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Implementing Advanced Services: Gigabit Ethernet Migration at Georgia Tech

This case study details the advanced services implemented at Georgia Tech, focusing on the migration to Gigabit Ethernet. With over 100 ELANs installed and adherence to standards-based VLANs using 802.1q, the campus is evolving towards an IP-only backbone. The study explores key aspects such as gateway routers, performance testing with tools like Iperf, and TCP tuning for enhanced network performance. Security measures for protecting research machines against DDoS attacks and the challenges of multivendor interoperability in multicast systems are also addressed.

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Implementing Advanced Services: Gigabit Ethernet Migration at Georgia Tech

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  1. Campus Case Studies in Implementing Advanced ServicesCas D’AngeloCas.DAngelo@oit.gatech.edu

  2. Preparing for Advanced Services • Gigabit ethernet migration • Gateway routers • Performance testing TCP tuning • Multicast • Security

  3. Gigabit ethernet migration • Georgia Tech has installed 100+ ELANS • Implemented as a standards based VLAN • New standards such as 802.1q now available

  4. Gigabit ethernet migration • Gigabit ethernet - supports large MTU • Wire speed routing • Trying to go with IP only backbone • Never routed IPX across backbone • Appletalk is the next protocol to be eliminated

  5. Gigabit ethernet migration • Building design moving from ATM attached ethernet switches to Gigabit ethernet attached 10/100 switches

  6. Gateway routers • Redundant routers Internet 1 PeachNet ATM OC-12 ATM OC-12 SoX Gateway 2 Router Gateway 1 Router Gigabit Ethernet Gigabit Ethernet Backbone (other campus routers)

  7. Gateway routers • OSPF load balancing for backbone • Packets alternate between routers • Both advertise default route originate

  8. Gateway routers • BGP used to control ISP traffic • Prefer SoX routes • AS padding for Internet 1 traffic • Arrangement with SoX to support large MTU

  9. Performance testing - TCP tuning • Iperf: http://dast.nlanr.net/Projects/Iperf/ Tools for experimenting with bandwidth throughput and adjusting TCP window sizes • Nettest: http://www-itg.lbl.gov/nettest/ A secure, real-time network monitoring framework which includes Iperf

  10. Performance testing - TCP tuning • Autobuf: http://dast.nlanr.net/Features/Autobuf_v1.0/An auto tuning-enabled FTP client and server

  11. Multicast • Vendors still working out problems • Multivendor interoperability leaves finger pointing problems • Within last few months have fought with mbgp community issue • Great tool: Access Grid + Multicast Beaconhttp://dast.nlanr.net/Projects/Beacon/

  12. Security • Border data - Tracking flows at egress to campus • Research machines are target for DOS, must be made secure • Firewalls are being installed to ease system administration and for contracts

  13. Questions • Cas D’Angelo, Network ManagerGeorgia Institute of TechnologyOffice of Information TechnologyCas.DAngelo@oit.gatech.edu • http://bart.ns.gatech.edu/cw

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