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The greatest challenge for internet QoS is to find lightweight traffic differentiation schemes that add value without adding significant additional operational complexity or endangering the principles that have made the Internet so successful.
The goal of the QBone is to test and deploy scalable QoS mechanisms in the Internet2 environment.
Moreover, within the Internet2 environment very few application performance problems can be traced to network congestion. Instead, end-to-end performance is often hampered by faults on or near end-systems including: broken TCP stacks (e.g. inadequate socket buffering), Ethernet duplex mismatch, and crummy cabling (e. g. CAT3, shared media, or physical damage).
One example of a non-elevated service is the QBone Scavenger Service (QBSS), which allows users, applications, and campus networks to mark traffic for potentially degraded treatment at congested downstream interfaces. QBSS is designed for bulk TCPs that are currently run voluntarily during periods of low-utilization (e.g. large nightly transfers of scientific datasets, network backups, CDN content pushing). It is also, however, gaining traction with Internet2 universities who want to downgrade the treatment of non-mission traffic, such as recreational file-sharing by students.
In addition, we are looking at non-elevated services like Alternative Best Effort (ABE) that could provide interactive applications with a low-latency best-effort service class.