5/12/011 eircom net IP Network Karl Jeacle

5/12/012 Overview PoP locations Peering & transit Access network Architecture & routing Monitoring & tools Traffic patterns

5/12/013 PoP locations

5/12/014 PoP locations Ireland –Dublin, Cork, Galway, Limerick –26 x dial pops International –2 x London, Amsterdam, Frankfurt –2 x New York

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

5/12/0110 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

5/12/0111 Access Network

5/12/0112 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

5/12/0113 Dial PoP Network

5/12/0114 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

5/12/0115 Hosting Data centres –Crown Alley & Citywest Power, pipe & ping –Exchange power: batteries & generators –Dual 100mb/s VRRP connection –Basic monitoring –Additional bespoke services available

5/12/0116 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!”

5/12/0117 Fixed Wireless eircom hold FWA licence Currently used for remote POTS 15km line of sight Potential for data services Data trials in 2002

5/12/0118 Architecture & Routing

5/12/0119 Pop Architecture

5/12/0120 Vendor Equipment Cisco –Routers, switches, access servers Lucent –Access servers Foundry –Switches/routers Redback –Broadband access servers

5/12/0121 Routing Static –Subnets assigned to customer links RIPv2 –Legacy equipment OSPF –All loopbacks & connected interfaces BGP –Internal prefixes & global routes

5/12/0122 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)

5/12/0123 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

5/12/0124 Multicast PIM-SM –Native multicast routing protocol MSDP & MBGP –Discover active multicast sources –Exchange routes to multicast sources IGMP –Dialup and ADSL access

5/12/0125 Monitoring & Tools

5/12/0126 Monitoring Custom-built monitoring system –Ping devices and link interfaces – 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

5/12/0127 Monitoring (2) Graph utilisation with MRTG –link bandwidth –memory –CPU –device specific data active ports active sessions IP address pools

5/12/0128 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

5/12/0129 Traffic Patterns

5/12/0130 Dial Ports

5/12/0131 Bandwidth

5/12/0132 Questions?