Self-management of hybrid optical and packet switching networks

Fioreze, Tiago; Pras, Aiko

doi:10.1109/inm.2011.5990527

Cited by 6 publications

(5 citation statements)

References 117 publications

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“…This situation is known as "the elephant and mice phenomenon". Fioreze [51] also shows that, since elephant flows generate a large amount of packets, there is a higher probability that a sampled packet belongs to one of these flows. In light of these considerations, we did not apply any scaling factor to the number of flows.…”

Section: The Surfnet Core Routersmentioning

confidence: 98%

“…In the literature, several flow definitions can be found [19,52,51,21]. We present the definition of IP flow as it is described by the IPFIX working group within the IETF [121,22]:…”

Section: Flow Definitionmentioning

confidence: 99%

“…Aggregated views on the network traffic can be obtained by choosing coarser grained flow definitions, according to the need of the network administrator. An overview of this process is given by Fioreze et al [52,51]. It is analogously possible to have more detailed flow definitions.…”

Section: Flow Definitionmentioning

confidence: 99%

“…In this case, it would be incorrect to assume that we observed 100 different flows. In real traffic, it has been shown that a small number of flows account for the biggest percentage of the traffic, while the size of the majority of the flows is small [108,51]. This situation is known as "the elephant and mice phenomenon".…”

Section: The Surfnet Core Routersmentioning

confidence: 99%

“…The issue that arises from this observation is how we can regroup TCP sessions in a reliable manner. A first possibility appears in Fioreze [51]. The author proposes to distinguish different TCP sessions based on the time gap between the end time of a flow record and the start time of the next one.…”

Section: Flow Collection Locationmentioning

confidence: 99%

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Flow-based intrusion detection

Sperotto¹

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Section: The Surfnet Core Routersmentioning

confidence: 98%

“…In the literature, several flow definitions can be found [19,52,51,21]. We present the definition of IP flow as it is described by the IPFIX working group within the IETF [121,22]:…”

Section: Flow Definitionmentioning

confidence: 99%

Section: Flow Definitionmentioning

confidence: 99%

Section: The Surfnet Core Routersmentioning

confidence: 99%

Section: Flow Collection Locationmentioning

confidence: 99%

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Flow-based intrusion detection

Sperotto¹

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Self-management of Hybrid Networks: Introduction, Pros and Cons

Fioreze

Pras

2011

Lecture Notes in Computer Science

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In the last decade 'self-management' has become a popular research theme within the networking community. While reading papers, one could get the impression that self-management is the obvious solution to solve many of the current network management problems. There are hardly any publications, however, that discuss the drawbacks of selfmanagement. In this paper we will therefore introduce self-management for the specific case of hybrid networks, and discuss some pros and cons. In particular, this paper investigates the feasibility to employ selfmanagement functions within hybrid optical and packet switching networks. In such networks, large IP flows can be moved from the IP level to the optical level, in an attempt to reduce the load at the IP layer and enhance the quality of service (QoS) of the flow that is moved to the optical level. One of the typical management tasks within such networks, is the establishment and release of lightpaths. This paper identifies the advantages and disadvantages of introducing self-management to control such lightpaths.

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Self-management of Hybrid Networks – Hidden Costs Due to TCP Performance Problems

Moura

Pras

Fioreze

et al. 2013

Lecture Notes in Computer Science

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Abstract. Self-management is one of the most popular research topics in network and systems management. Little is known, however, regarding the costs, in particular with respect to performance, of self-management solutions. The goal of this paper is therefore to analyze such hidden performance costs. Our analysis will be performed within the context of a specific example, namely automatically moving elephant flows from the routed IP layer to optical light-paths (lambdas) in hybrid networks. The advantage of moving elephant flows to light-paths is that such flows will experience lower delays, lower jitter and lower loss, thus better Quality of Service (QoS), while reducing the load at the IP-level, which means that the remaining flows will also experience better QoS. The lower delay at the optical level may cause temporary reordering of packets, however, since the first packet over the light-path may arrive at the receiver side before the last routed IP packet has arrived. Such reordering may lead to short but severe performance problems at the TCP level. We systematically analyze under which conditions such TCP performance problems occur, and how severe these problems are. Although our conclusions are specific to self-management of hybrid networks, it demonstrates by means of an example that self-management solutions may also introduce new problems, which must further be investigated before conclusions can be drawn regarding the pros and cons of self-management.

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Self-management of hybrid optical and packet switching networks

Cited by 6 publications

References 117 publications

Flow-based intrusion detection

Flow-based intrusion detection

Self-management of Hybrid Networks: Introduction, Pros and Cons

Self-management of Hybrid Networks – Hidden Costs Due to TCP Performance Problems

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