5/12/011 eircom net ip network karl jeacle [email protected]
Post on 19-Dec-2015
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5/12/01 2
Overview
• PoP locations
• Peering & transit
• Access network
• Architecture & routing
• Monitoring & tools
• Traffic patterns
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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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Peering
• INEX– Dublin - Irish ISPs & HEANET
• LINX– London - UK & Europe
• AMSIX– Amsterdam - Europe
• DECIX– Frankfurt - Europe
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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
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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
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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
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Hosting
• Data centres– Crown Alley & Citywest
• Power, pipe & ping– Exchange power: batteries & generators– Dual 100mb/s VRRP connection– Basic monitoring– Additional bespoke services available
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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!”
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Fixed Wireless
• eircom hold FWA licence
• Currently used for remote POTS
• 15km line of sight
• Potential for data services
• Data trials in 2002
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Vendor Equipment
• Cisco– Routers, switches, access servers
• Lucent– Access servers
• Foundry– Switches/routers
• Redback– Broadband access servers
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Routing
• Static– Subnets assigned to customer links
• RIPv2– Legacy equipment
• OSPF– All loopbacks & connected interfaces
• BGP– Internal prefixes & global routes
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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)
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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
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Multicast
• PIM-SM– Native multicast routing protocol
• MSDP & MBGP– Discover active multicast sources– Exchange routes to multicast sources
• IGMP– Dialup and ADSL access
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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
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Monitoring (2)
• Graph utilisation with MRTG– link bandwidth– memory– CPU– device specific data
• active ports• active sessions• IP address pools
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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