Strategies for updating link states in QoS routers

A crucial aspect of quality of service routing is the frequency with which the nodes have to exchange information about the availability of network resources. The authors classify and compare several strategies for triggering the update process in the nodes. Simulating an actual wide area network as a test-bed, it is shown that the triggering must be based on the relative variations of the available bandwidth in the links, in contrast to using the utilised bandwidth or considering an absolute threshold policy of periodical updates