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This paper deals with optimal load balancing in telecommunication networks based on multiple spanning tree routing. This is the case in switched Ethernet networks where the operator configures different routing spanning trees and assigns each demand VLAN to one of the spanning trees. We consider modeling and solving three load balancing objectives: (i) minimization of the average link load with a...
The paper addresses an optimization problem related to dimensioning links in a resilient two-layer network. A particular version of the problem which assumes that links of the upper layer are supported by unique paths in the lower layer is considered. Two mixed-integer programming formulations of this problem are presented and discussed. Direct resolving of these formulations requirespre-selection...
A powerpoint presentation is given. The paper discusses flow optimization in IP networks with fast proactive recovery. IP fast rerouting includes equal-cost multiple paths, loop free alternate and multihop repair path. The main purpose of the optimization model is to exhibit the efficiency of the IPFR , to develop an efficient resolution method based on iterative heuristic partitioning method by numerical...
Intra-domain routing in IP networks is based on the shortest path principle by assigning administrative weights (costs) to links. The resulting least-cost paths determine routes between pairs of routers. If several such equal-cost paths exist between a pair of routers, it may not be clear which of them is actually used to route traffic. This makes it difficult to predict the network traffic flow distribution...
In this paper we address link dimensioning and routing problems related to the area of resilient network design. We present two network design problems that assume different flow restoration schemes used to cope with network failures. In both cases we allow bifurcation of traffic flows in the normal (failure-less) network state. In the case of a failure, we assume that affected primary flows (i.e...
W artykule przedstawiono nowe podejście do zagadnienia wpływu chropowatości rurociągu na charakterystyki przepływomierzy zwężkowych. Podejście to polega na zastosowaniu nowo opracowanych parametrów mikrogeometrii powierzchni. W trakcie badań wzorcowano kryzy o przewężeniach β = 0,2, 0,5 i 0,75 w rurociągach o DN 50, 80 i 100 i obliczano współczynniki przepływu na podstawie tych wzorcowań dla różnych...
In this paper we address intra-domain routing optimization issues in Internet networks related to a combination of open shortest path first (OSPF) and multi protocol label switching (MPLS) routing protocols. Since MPLS can be combined with any routing protocol there has appeared an idea of coupling IP streams routed via the OSPF protocol and MPLS label switched paths (LSPs) in the same network. Such...
In the paper we address traffic engineering problems related to optimization of routing in IP networks applying destination-based shortest path routing (SPR) of the OSPF type. An SPR routing pattern is determined by a system of (administrative) weights defined over the set of IP links: the routes for IP forwarding are determined as the shortest paths computed locally at the nodes using the current...
In this paper we address the problem of routing optimization in IP networks. We assume that traffic is routed along the shortest paths computed with respect to administrative link metrics. Metrics are distributed in a network by open shortest path first (OSPF) or a similar routing protocol. If it happens that the shortest path is not unique then equal-cost multi-path (ECMP) load balancing principle...
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