eircom net IP Network

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eircom net IP Network

• Karl Jeacle
• kj_at_eircom.net

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Overview

• PoP locations
• Peering transit
• Access network
• Architecture routing
• Monitoring tools
• Traffic patterns

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PoP locations
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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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Access Network
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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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Dial PoP Network
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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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Architecture Routing
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Pop Architecture
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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 Tools
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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

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Traffic Patterns
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Dial Ports
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Bandwidth
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Questions?