Abstract:
Traffic engineering is a mechanism for optimizing the performance of a network by
dynamically analyzing, predicting and regulating the flow of data transmitted over that
network. In the last decade many standards and protocols have been introduced in the same
domain by Internet Engineering Taskforces (IETF). QOS is another factor that cannot be
overlooked at the same time besides resource optimization. MPLS with Differentiated service
provide the dual flavor by ensuring Quality of Service and efficient network utilization.
Traffic Engineering with Link Coloring (TELIC), proposed in year 2002, is an algorithm to
automate the process of Traffic Engineering for MPLS aware Diffserv domain. TELIC
assigns colors to links in the network domain and updates link colors on the basis of
reservable bandwidth. IETF introduced bandwidth allocation models Maximum Allocation
Model (MAM) and Russian Doll Model (RDM) in year 2004. MAM refers to
segregation/isolation of class types with no channel pre-emption whereas RDM refers to the
aggregation by allowing lower classes to use bandwidth of higher class on availability and
pre-empted when required. TELIC automates Traffic Engineering process by class type
segregation (just like MAM) through link colors with inherent feature of pre-emption. Preemption makes TELIC distinct from MAM however TELIC defines no rule for premium
classes (i.e. EF, AF) to move on the same link.
Current work introduces enhanced version of TELIC, while making it compliant with RDM.
This is done by establishing traffic mixing i.e. lower classes can share the bandwidth of
higher classes. The induction of traffic mixing trounce the missing part of TELIC and
introduces new rule set for conjunction limits, link colors and bandwidth constraints thus
automate the process of Traffic Engineering.
