Transcript No Slide Title

eircom net IP Network
Karl Jeacle
[email protected]
5/12/01
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Overview
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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
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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
Core Network
core1
core2
switch1
switch2
edge1
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edge2
edgeN
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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?
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