Networking and Quality of Service Robin Tasker, Daresbury Laboratory, 20 October 2000 In the UK, based on a GRID networking workplan :- definition and understanding of terms of QoS; traffic management techniques; diffserv; bandwidth broker techniques and capabilities; and GRID matchmaking

Development Process Understanding :- theoretical basis of approach etc.. Laboratory testbed for techniques :- develop (or learn from others’) experience in well constrained environments Wide area testing of techniques :- look for the issues, costs and benefits in the “real world” Wide area deployment - if appropriate and possible

ESnetJANET ns2.slac.stanford.edu evagore.slac.stanford.edu icfamon.dl.ac.uk By default ALL ESnet traffic marked “high” priority into JANET via NY PoP Traffic from evagore.slac.stanford.edu marked at “normal” priority into JANET at the NY PoP (CAR + WRED) Low-level traffic management techniques Congestion Avoidance - CAR and WRED

ESNet High Priority CAR+WRED enabled Config changes to CAR and WRED Further config changes

ESNet Normal Priority CAR+WRED enabled Config changes to CAR and WRED Further config changes

AbileneJANET icfamon.dl.ac.uk By default ALL Abilene traffic marked “high” priority into JANET via NY PoP (CAR + WRED) Just how relevant are such techniques?

CAR+WRED enabled Config changes to CAR and WRED Further config changes Abilene High Priority Peering bandwidth increased

Conclusions Understanding of theoretical basis of approach is important Laboratory testbed for techniques either to develop (or to learn from others’) experience in a well constrained environment is important Wide area testing of techniques looking for the issues, the costs and the benefits in the “real world” is absolutely vital QoS techniques may be exciting and interesting but do they give best return on investment to meet user requirements?