groups of resident services are controlled by distinct administrations, which manage the infrastructure among local services and commit the communication infrastructure with the rest of the Grid to third parties.
There are two distinct scenarios that need to be considered:
This conclusion comes from the consideration that single administrations try to exploit as much as possible their share of an expensive infrastructure: there is little sense in a community that leases a 1Gbps long-haul interconnection, while the internal connectivity is based on a 100 Mbps infrastructure.
In a "store and forward" Grid where traffic is reasonably engineered, characteristics should be mainly determined by inter-domain fabric.
In that case the inter-domain infrastructure is over-dimensioned: the inter-domain infrastructure is less expensive than the intra domain one.
The economic point of view is opposite with respsct to the previous one: the consequence is that the bottleneck will be probably within the domain.
This reduces the task of monitoring the overall NxN grid to monitoring N domains.
We conclude that, in both scenarios, having recognized the "special role" played by the inter-domain infrastructure helps the task of monitoring the netwrok infrastructure.
This is also consistent with the architectural foundations of the DiffServ architecture.