1. T0-T1 Networking Meeting 16th June Meeting
David Foster
Cambridge
LHC T0-T1 Meeting, Cambridge, June 2006

2. Current State
We have had a number of meetings and agreed on an overall approach with many open questions.
Some results have been published
And we have a wiki site for gathering operational information – important outcome of these meetings.
As we move more and more towards providing an production infrastructure needed for service challenges in 2006, many basic issues still remain.
LHC T0-T1 Meeting, Cambridge, June 2006

3. Key Dates in 2006
31st March. 6 Tier-1’s (3 via Geant) with their final links.
We did not quite achieve this milestone.
30th April. SC4 Setup
31st May. SC4 Stable Service
30th September. End SC4/Start Initial LHC Service
1) 8 Tier-1s and 20 Tier-2s must have demonstrated availability better than 90% of the levels specified in Annex 3 of the WLCG MoU [adjusted for sites that do not provide a 24 hour service]
2) Success rate of standard application test jobs greater than 90% (excluding failures due to the applications environment and non-availability of sites)
3) Performance and throughput tests complete: Performance goal for each Tier-1 is the nominal data rate that the centre must sustain during LHC operation: CERN-disk > network > Tier-1-tape. Throughput test goal is to maintain for one week an average throughput of 1.6 GB/s from disk at CERN to tape at the Tier-1 sites. All Tier-1 sites must participate.
LHC T0-T1 Meeting, Cambridge, June 2006

4. Todays Meeting
The purpose of todays meeting is to focus on the problems of resiliance as agreed at the Rome meeting.
We have primary circuits well defined.
We can purchase physically diverse backup circuits
Done for the US
Possible on the GEANT footprint
Other initiatives bring opportunities
GLIF, Cross Border Fiber
We need to converge on a layer-3 design that allows the re-direction of traffic in case of failure that utilises the available L1/L2 infrastructure as appropriate.
Need to understand the level of service this will provide also.
The questions to be answered are:
Can we identify for each primary link failure where the traffic will flow?
Do we have a necessary and sufficient L3 design?
What circuits can be considered as available and configured into the OPN?
What additional circuits should be provisioned?
LHC T0-T1 Meeting, Cambridge, June 2006

5. Circuits – 2007 View LHC T0-T1 Meeting, Cambridge, June 2006 Number
Source
Destination
Service
Provider
Capacity 1
CERN
IN2P3
Dedicated
RENATER
10Gbit 2
Netherlight
GN2 3 4
SARA 5
FZK 6
PIC 7
NDGF 8
CNAF 9
RAL 10
Manlan
Commercial
<10GBit 11
Starlight
<10Gbit 12
ASGC 13
TRIUMF
CANARIE 14
GridKa
DFN/SWITCH
10 Gbit
To be discussed!!! 15
DFN/SWITCH/GARR
Now 16
DFN/RENATER
Q4 2006 17
DFN/SURFNET
Q2 2006 18
SURFNET/NORDUNET
10 GBit
LHC T0-T1 Meeting, Cambridge, June 2006

6. T1 – 2007 View LHC T0-T1 Meeting, Cambridge, June 2006 Source
Destination
Primary
Primary e2e Capacity
Alternate
Alternate Provider
Alternate e2e capacity
CERN
IN2P3 1
10Gbit
ASGC
2,12
TRIUMF
3,13
SARA 4
FZK 5
PIC 6
NDGF 7
CNAF 8
RAL 9
BNL
10, EsNet
<10GBit
FNAL
11, EsNet
<10Gbit
LHC T0-T1 Meeting, Cambridge, June 2006

7. Conclusions From April 2006
T1-T1 requirements becoming better understood and will be an issue.
Lots of new initiatives, do we have a complete overview?
Need to now discuss in much more detail the issue of the operational schedule, planned/unplanned outages and backup strategies including CBF.
Routing
Document produced and on Twiki.
NOC information on the Twiki. But clearly not 24x7. Need a meeting dedicated to this.
No T1-T1 traffic but not excluded.
Basic ACL monitoring in place.
Allowed IP addresses in the RIPE database.
Need: BGP on all sites.
Operations
ENOC model and integration with NREN’s and DANTE will continue.
Dante deploying Perfsonar and integrate with ESNet, Canarie and Taiwan.
Plan to report on the experience at next OPN meeting
Security
Document has been produced.
Robin to liaise and agree with site security officers.
Report on feedback at the next meeting.
Monitoring
Document has been produced and published.
PerfSONAR will provide the basic level-1 monitoring.
T1 volunteers for prototype monitoring tests.
Need to demonstrate value through volunteers.
Will try and use this for demonstration purposed.
Piggyback on the perfsonar activity, but get more information?
Site Reports Campus Status
US Labs complete both have redundant 10G paths
IN2P3, NDGF, RAL, TRIUMF Complete but backup unclear
SARA,CNAF,FZK complete, Backup via CBF with each other.
ASGC Complete, Backup via US (in 2007). T2’s will have 10G links.
PIC ?
Next meetings
Next to be end June16th.
Progress reports on the above topics.
LHC T0-T1 Meeting, Cambridge, June 2006