An Ethernet Ring Protection Method to Minimize Transient Traffic by Selective FDB Advertisement

Lee, Kwang-Koog; Ryoo, Jeong‐dong; Min, Seungwook

doi:10.4218/etrij.09.0209.0244

Cited by 9 publications

(8 citation statements)

References 3 publications

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“…If this transit traffic can be delivered without IP routing, the router in the core network can be as small as 40-50% of the current one. This result leads to a reduction of 65-75% in CAPEX [7]; the packets will also not experience multi-hop routing. In Figure 5 the ingress traffic in the core network is linked to the destination through the cut-through paths.…”

Section: Capex and Opexmentioning

confidence: 99%

Architecture of an Enhanced Packet-Optical Transport System

Chun

Kwon

Kim³

et al. 2014

IJMUE

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Section: Capex and Opexmentioning

confidence: 99%

Architecture of an Enhanced Packet-Optical Transport System

Chun

Kwon

Kim³

et al. 2014

IJMUE

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“…Those studies above analyzed how the congested networks affect the stability of communication protocols, whereas there are several efforts to solve the traffic overshoot problem caused by an FDB flush operation [14][15] [16].…”

Section: Related Workmentioning

confidence: 99%

Enhanced Protection Schemes to Guarantee Consistent Filtering Database in Ethernet Rings

Lee

Ryoo

2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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Most of current ring-based Ethernet protection schemes work on a basis of filtering database (FDB) flush operation to guarantee data forwarding on protection switching. However, when a link or node failure occurs in a congested ring network, delayed data frames that have lower priorities than control frames can cause the FDB inconsistency problem that ring nodes build incorrect FDB information. Under this circumstance, some of ring nodes forward data frames in the wrong directions, so that the ring network shows undesirable and unstable performance. In order to resolve this problem, this paper introduces the following three techniques: flush delay timer, purge triggering, and priority setting. Especially, for the priority setting scheme we develop an absorbing Markov chain model for the Ethernet Ring Protection (ERP) protocol defined by G.8032. Then, we theoretically estimate the expected protection time on protection switching underlying the M/M/1/k queue system and also suggest an enhanced priority setting method to guarantee reliable protection switching even in a congested network. Along with our theoretical approach, we additionally evaluate the protection performance with a network simulator to verify our mathematical model. Simulation results show that our analytic model is indeed capable of estimating the expected protection switching time.

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“…For a single-ring domain, Rhee and others proposed a method called FDB flipping, which makes the NAFs send the modified R-APS (SF) messages to inform other nodes of the addresses impacted by the protection switching [23]. In [25], Lee and others proposed the selective FDB advertisement scheme to let all ring nodes exchange their subnet FDB information with each other after the FDB flush operation. Meanwhile, Lee and others introduced an optimization scheme operating on a multi-ring architecture [24].…”

Section: Flush Optimization Schemesmentioning

confidence: 99%

Impacts of Hierarchy in Ethernet Ring Networks on Service Resiliency

Lee¹,

Ryoo²,

Kim³

2012

ETRI J

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In transport networks, a multi-ring architecture is very useful to facilitate network planning and to design and provide more resilient services for customers. Unlike traditional synchronous optical network multi-rings, the service resiliency of Ethernet-based multi-rings is significantly impacted by the ring hierarchy because a link or node failure in a certain level ring triggers filtering database flush actions in all higher level rings as well as in the ring with the failure, and consequently a large amount of duplicated data frames may be flooded. In this paper, we investigate how the ring hierarchy impacts the service resiliency of multi-ring networks. Based on extensive experiments on various single-and multiple-link failures, we suggest two effective inter-ring connection rules to minimize the transient traffic and to ensure more resilient multi-ring networks. In addition, we consider a flush optimization technique called e-ADV, and show that the combination of e-ADV and multi-ring structures satisfying our inter-ring connection rules results in a more attractive survivability performance.

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An Ethernet Ring Protection Method to Minimize Transient Traffic by Selective FDB Advertisement

Cited by 9 publications

References 3 publications

Architecture of an Enhanced Packet-Optical Transport System

Architecture of an Enhanced Packet-Optical Transport System

Enhanced Protection Schemes to Guarantee Consistent Filtering Database in Ethernet Rings

Impacts of Hierarchy in Ethernet Ring Networks on Service Resiliency

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