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We present results both from detailed simulations and a complete implementation using software IP routers. ... We use Voice-over-IP as our test application, and show that if end-toend quality is to be maintained during short unpredictable bursts of high load, then a fast-timescale control such as migration is required ... At each node, we use Alt-Q  to provide guaranteed per-packet service. 1) Monitoring: Each first-hop LSR runs a monitoring program that uses the ALTQ/CBQ  module to monitor the congested link ...doi:10.1109/glocom.2003.1258807 dblp:conf/globecom/KuoPBLSC03 fatcat:ek2jkn4scfbdbhxqtlecndbuxe