network connectivity and projects – a perspective from the uk richard hughes-jones ppncg
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Network Connectivity and Projects – a Perspective from the UK Richard Hughes-Jones PPNCG. SuperJANET4 Status Connectivity to Europe Connectivity to the US Grid Networking Projects. SuperJANET4: Backbone and Access links. Worldcom supplied the transmission UKERNA layer the IP service - PowerPoint PPT PresentationTRANSCRIPT
Network Connectivity and Projects – a Perspective from the UK
Richard Hughes-Jones PPNCG
SuperJANET4 StatusConnectivity to EuropeConnectivity to the USGrid Networking Projects
SuperJANET4: Backbone and Access links
Worldcom supplied the transmissionUKERNA layer the IP service
Core PoP IP router at WorldcomBackbone Access Router at MANs
Access Links:Large MAN 2.5 Gbit -> 10-20 GbitMedium MAN 622 Mbit -> 2.5 Gbit
4 node DWDM development netDeployment Status:
Backbone Oct 00 Routers Nov 00All sites Mar 01Proved to be StableConstant growth of traffic
SuperJANET4: ping rtt Core routers Jun 01
SuperJANET4: ping rtt Core routers
Lancaster Glasgow
MAN / LAN Issues
Bristol Cambridge
London MAN Upgrade
UDP ThroughputMbit/s
UDP Packet loss%
UDPmon TestsManchester – London
MAN was 155 Mbit ATM
1st Oct Time interval in Weeks Richard HJ
ICFAMON Plot from RAL to CERN for 19th Oct to 1st Nov 2001
Connectivity to Europe – Access links (1)
UK Access link 155 Mbit ATMSustained rate 130 MbitContract to end of Nov 01Bad news for users !
Traceping Oxford to CERN for 31st October 2001 Connectivity to Europe – Access links (2)
loss around ten155-gw.ja.net router
J. Macallister
Connectivity to Europe : GeantStart mid November 2001UKERNA switched off TEN-155 3 Dec 2001Monitoring – see later
Connectivity to US
6 * 155 Mbit links
US link about to go to 2.5 G bitIP commodity attached in London Research traffic over 2.5G bitPeer in Hudson St. 622 Mbit to Esnet622 Mbit to Abilene.
Monitoring: US Traffic UKERNA Traffic data Kbit/s. Blue Traffic from US; Maroon Traffic to US17 Jul 2000 (300kbit/s) 7 Dec 2001 (900kbit/s)
peak is 88% of total BW 930 Mbit10 minute averages 10 minute averages
Last 7 days 1 hour averages Last 7 days 1 hour averages
Monitoring: US Traffic - TrendsJan 99 – Nov 02
UKERNA – US Traffic Daily totals Mbytes
Weekend
Xmas 99
Weekday
Xmas 01
Peak load ~88 %
J. Macallister
Grid Network Projects
DataGridGridPP
Extending DataGrid to BaBar, D0, CDF,… in UKDataTAG
Foci: Network resarch, Grid inter-operability MB-NG
UK funded 2.5Gbit Development NetworkOptical Switching
Network MonitoringSeveral tools in test – plugged into a coherent
structure: PingER, RIPE one way times, iperf, UDPmon, rTPL, GridFTP,
and NWS prediction engine continuous tests for last few months to selected sites:
DL Man RL UCL CERN Lyon Bologna SARA NBI SLAC … The aims of monitoring for the Grid:
to inform Grid applications, via the middleware, of the current status of the network – input for resource broker and scheduling
to identify fault conditions in the operation of the Grid to understand the instantaneous, day-to-day, and month-by-month
behaviour of the network – provide advice on configuration etc.Report written on LDAP scheme for publishing the
network informationWill be used by UK e-science sites and non HEP WPs
UDPmon Measuring Throughput with UDP
Send a burst of UDP frames spaced at regular intervalsVary the frame size and the frame transmit spacingRecord
The time to send and the time to receive the frames The number received, the number lost, number out of order The received inter-packet spacing
Zero stats
OK done
●●●
Get remote statistics
Send statistics
Send data frames atregular intervals ●●●
Time to send
Time to receive
Inter-packet time
Local NetworkMonitoring
Store & Analysisof Data (Access)
Access to current and historic dataand metrics via the Web, i.e. WP7NM Pages, access to metric forecasts
Backend LDAP script to fetch metricsMonitor process to push metrics
localLDAPServer Grid Application access via
LDAP Schema to- monitoring metrics; - location of monitoring data.
PingER(RIPE TTB)
IperfERUDPmon
rTPLNWS
etc
LDAPSchemaGrid Apps
GridFTP
Network Monitoring Architecture
Robin Tasker
Network Monitoring Components
Ping Netmon UDPmon iPerf Ripe
Cronscript
plot
Table
LDAP
raw
control Cronscript
controlCronscript
plot
Table
LDAP
raw plot
Table
LDAP
raw
WEB Display AnalysisGrid BrokerPredictions
Web I/f
Scheduler
Tool
Clients
LDAP
raw
LDAP
raw
Ping & UDP throughput MAN-RAL From 20 Oct 01
PingER rtt (ms) dl – RAL 1000 byte packetForecast
UDPmon Zero packet loss!UDPmon throughput
Mbit/s man – RAL300 * 1400 byte frames
Ping & UDP throughput MAN-CERNFrom 20 Oct 01
PingER rtt (ms) dl – cern 1000 byte packetForecast
UDPmon throughput Mbit/s
man – cern300 * 1400 byte frames
iperf & UDP throughput MAN-CERN From 20 Oct 01
Iperf throughput ucl – cern 262144 byte bufferForecast
UDPmon throughput Mbit/s
man – cern300 * 1400 byte frames
iperf & UDP throughput MAN-SARA From 20 Oct 01
Iperf throughput ucl – sara 262144 byte bufferForecast
UDPmon throughput Mbit/s
man – sara300 * 1400 byte frames
iperf & Pinger UK-Bologna From 20 Oct 01
Iperf throughput ucl – Bologna 262144 byte bufferForecast in green
PingER rtt (ms) dl – Bologna1000 byte packetForecast
iperf throughput UCL-SARA From 1 Nov 01 – Geant Operational
Iperf throughput ucl – sara 262144 byte buffer
Geant Enabled Routing Stable
Brief outline of work plan
High Performance High Throughput: Understanding the end system HW, best way to monitor traffic and protocol packets, Type and effect of background traffic, Throughput vs rtt, throughput vs window-size, Throughput using multiple TCP streams, and effect on the Network GridFTP and BBftp at Gigabit, Effect of different TCP stacks, Use of non-TCP protocols, and effect on the Network Show and tell demos
Bandwidth Reservation and QoS Identification of traffic classes and middleware components
requiring QoS Study of traffic differentiation and traffic engineering techniques demonstration of QoS & Bandwith Reservation
The EU DataTAG project
EU Transatlantic Gigabit project.Status: approved for 4 M ECU start on 1 Dec 2001Partners: CERN/PPARC/INFN/UvA. IN2P3 sub-
contractorThe main foci are:Grid Network Research including:
Provisioning (CERN) Investigations of high performance data transport (PPARC) End-to-end inter-domain QoS + BW / network resource
reservation Bulk data transfer and monitoring (UvA)
Interoperability between Grids in Europe and the US PPDG, GriPhyN, DTF, iVDGL (USA)PPDG, GriPhyN, DTF, iVDGL (USA)
DataTAG project
Abilene
ESNET
MREN
STAR-TAP
UKSuperJANET4
ITGARR-
B
GEANT
NewYork
Olivier Martin
NLSURFne
t
2.5 Gbit lambda between CERN and StarlightPOS 2nd half 2002 – WDM later
STAR-LIGHT
CERN
2.5 Gbps SDH “Lambda”100/1000 Mbps Ethernet
Amsterdam
GSR
GSRGSR
GSR
GSR
λ Broker
Application
CERN
StarLight
Italy
UK
Optical Switching - DataTAG
7600
IwireAbileneESnet
MB – NG SuperJANET Testbed
MB - NGSuperJANET4ProductionNetwork
Leeds
RAL /UKERNA
RAL /UKERNA
SJ4 DevC-PoP
Reading
SJ4 DevC-PoP
Warrington
Manc MCC
ULCC UCL
SJ4 DevC-PoPLondon
Gigabit Ethernet2.5 Gbit POS10 Gbit POS
E-science core projectMB - NG
Project to investigate and pilot: end-to-end traffic engineering and management over multiple
administrative domains – MPLS in core diffserv at the edges. Managed bandwidth and Quality-of-Service provision. (Robin Tasker) High performance high bandwidth data transfers. (Richard HJ) Demonstrate end-to-end network services to CERN using Dante EU-
DataGrid and the US DataTAG. Status: approved with requested funds start on 1 Dec 2001 Partners:CISCO, CLRC, Manchester, UCL, UKERNA plus
Lancaster and Southampton (IPv6) A technical meeting held – draft spec. of the HW required Would like to use real Grid traffic – as demonstrator:
CDF UCL-RAL BaBar Man-RAL
And Finally in case it helps:
GridPP and DataGrid have been working on packaging Globus v2 as a .rpm kit.Makes installation simpler.Available from DataGrid WP6 web: marianne.in2p3.fr/datagrid/testbed1/globus
Conclusion & Status
SuperJANET4 stable working well Access links to Campus becoming very inportantNetwork Links and peering to US good overallUS-UK bandwidth upgrade overdue Geant access to Europe OK (at the moment !)Considerable UK interest in the Internet2 tests Grid: Lots of interesting work to do …