eircom net IP Network Karl Jeacle kjeircom net

eircom net IP Network Karl Jeacle kj@eircom. net 5/12/01 1

Overview • • • Po. P locations Peering & transit Access network Architecture & routing Monitoring & tools Traffic patterns 5/12/01 2

Po. P locations 5/12/01 3

Po. P locations • Ireland – Dublin, Cork, Galway, Limerick – 26 x dial pops • International – 2 x London, Amsterdam, Frankfurt – 2 x New York 5/12/01 4

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Peering • INEX – Dublin - Irish ISPs & HEANET • LINX – London - UK & Europe • AMSIX – Amsterdam - Europe • DECIX – Frankfurt - Europe 5/12/01 9

Transit • Locations – London, Amsterdam, New York • Providers – Have been / are customers of: • MCI, Unisource, UUnet, • GTS/Ebone, KPN/Qwest, • Cable & Wireless, Teleglobe – 95 th percentile usage billing 5/12/01 10

Access Network 5/12/01 11

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 / 128 K ISDN • Free product • “Geo” numbers = local call rates • PSTN and 64 K ISDN 5/12/01 12

Dial Po. P Network 5/12/01 13

Fixed Circuits • Leased line • Typically 64/128/256/512/1024/2048 • More recently, 34 Mb/s • Frame relay • 64 K to 2 Mb/s lines into national cloud • Single PVC from cloud to ISP • ATM • Customer buys 34 M or 155 M ATM port • 2 Mb/s to 155 Mb/s PVC to ISP 5/12/01 14

Hosting • Data centres – Crown Alley & Citywest • Power, pipe & ping – Exchange power: batteries & generators – Dual 100 mb/s VRRP connection – Basic monitoring – Additional bespoke services available 5/12/01 15

ADSL • Initial rollout in greater Dublin area • Product options – Speed: 512/128 or 1 Mb/256 – USB or ethernet – Single/multiple user – Download allowances • PPPo. E – “Preserves the dialup experience!” 5/12/01 16

Fixed Wireless • • • eircom hold FWA licence Currently used for remote POTS 15 km line of sight Potential for data services Data trials in 2002 5/12/01 17

Architecture & Routing 5/12/01 18

Pop Architecture 5/12/01 19

Vendor Equipment • Cisco – Routers, switches, access servers • Lucent – Access servers • Foundry – Switches/routers • Redback – Broadband access servers 5/12/01 20

Routing • Static – Subnets assigned to customer links • RIPv 2 – Legacy equipment • OSPF – All loopbacks & connected interfaces • BGP – Internal prefixes & global routes 5/12/01 21

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) 5/12/01 22

BGP • Border Gateway Protocol • Used both internally and externally • e. BGP when used as EGP • announce eircom & customer routes • receive global routing table • i. BGP when used as IGP • carries global routes around network • injected with eircom customer routes 5/12/01 23

Multicast • PIM-SM – Native multicast routing protocol • MSDP & MBGP – Discover active multicast sources – Exchange routes to multicast sources • IGMP – Dialup and ADSL access 5/12/01 24

Monitoring & Tools 5/12/01 25

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 5/12/01 26

Monitoring (2) • Graph utilisation with MRTG – link bandwidth – memory – CPU – device specific data • active ports • active sessions • IP address pools 5/12/01 27

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 5/12/01 28

Traffic Patterns 5/12/01 29

Dial Ports 5/12/01 30

Bandwidth 5/12/01 31

Questions? 5/12/01 32