eircom net IP Network

1. eircomnet IP Network Karl Jeacle kj@eircom.net

2. Overview • PoP locations • Peering & transit • Access network • Architecture & routing • Monitoring & tools • Traffic patterns

3. PoP locations

4. PoP locations • Ireland • Dublin, Cork, Galway, Limerick • 26 x dial pops • International • 2 x London, Amsterdam, Frankfurt • 2 x New York

9. Peering • INEX • Dublin - Irish ISPs & HEANET • LINX • London - UK & Europe • AMSIX • Amsterdam - Europe • DECIX • Frankfurt - Europe

10. Transit • Locations • London, Amsterdam, New York • Providers • Have been / are customers of: • MCI, Unisource, UUnet, • GTS/Ebone, KPN/Qwest, • Cable & Wireless, Teleglobe • 95th percentile usage billing

11. Access Network

12. Dialup • Access servers fed by ISDN PRAs • Hence all pops ISDN-capable • (Modems must be added for PSTN) • Subscription product • 1891 number = reduced call rates • PSTN default, option of 64 / 128K ISDN • Free product • “Geo” numbers = local call rates • PSTN and 64K ISDN

13. Dial PoP Network

14. Fixed Circuits • Leased line • Typically 64/128/256/512/1024/2048 • More recently, 34Mb/s • Frame relay • 64K to 2Mb/s lines into national cloud • Single PVC from cloud to ISP • ATM • Customer buys 34M or 155M ATM port • 2Mb/s to 155Mb/s PVC to ISP

15. Hosting • Data centres • Crown Alley & Citywest • Power, pipe & ping • Exchange power: batteries & generators • Dual 100mb/s VRRP connection • Basic monitoring • Additional bespoke services available

16. ADSL • Initial rollout in greater Dublin area • Product options • Speed: 512/128 or 1Mb/256 • USB or ethernet • Single/multiple user • Download allowances • PPPoE • “Preserves the dialup experience!”

17. Fixed Wireless • eircom hold FWA licence • Currently used for remote POTS • 15km line of sight • Potential for data services • Data trials in 2002

18. Architecture & Routing

19. Pop Architecture

20. Vendor Equipment • Cisco • Routers, switches, access servers • Lucent • Access servers • Foundry • Switches/routers • Redback • Broadband access servers

21. Routing • Static • Subnets assigned to customer links • RIPv2 • Legacy equipment • OSPF • All loopbacks & connected interfaces • BGP • Internal prefixes & global routes

22. OSPF • Open Shortest Path First • IGP (Interior Gateway Protocol) • runs on all devices inside network • carries local connectivity information • provides • shortest path route through network • default route for non-BGP speakers • relatively fast convergence time (~1 sec)

23. BGP • Border Gateway Protocol • Used both internally and externally • eBGP when used as EGP • announce eircom & customer routes • receive global routing table • iBGP when used as IGP • carries global routes around network • injected with eircom customer routes

24. Multicast • PIM-SM • Native multicast routing protocol • MSDP & MBGP • Discover active multicast sources • Exchange routes to multicast sources • IGMP • Dialup and ADSL access

25. Monitoring & Tools

26. Monitoring • Custom-built monitoring system • Ping devices and link interfaces • Email notification by default • Pager notification on critical failure • Any network device • Key links (e.g. international circuits) • 24 x 7 customers • Weekly reports generated from logs

27. Monitoring (2) • Graph utilisation with MRTG • link bandwidth • memory • CPU • device specific data • active ports • active sessions • IP address pools

28. Tools • Collect data • SNMP - perl library allows SNMP get/walk queries • expect - automated login allows “show” command output • syslog - swatch catches key events • Process • perl, sh, sed, awk, tcl/expect • Display • HTML: MRTG, RRDtool, perl/gd

29. Traffic Patterns

30. Dial Ports

31. Bandwidth

32. Questions?