Carriers and service providers are rushing to provide Ethernet-based virtual private network services in metro area
network (MAN) as the most cost effective way to address the needs of the enterprise network market. To address the fast
recovery from any signal failure issue in the Metro Ethernet, we propose a metro Ethernet architecture based on multiple
Enhanced Self-protected Spanning Trees (ESST). The recovery mechanism, named Birthday-based Link Replacing
Mechanism (BLRM), in this architecture is able to transform a self-protected spanning tree into another spanning tree
after any signal link or node failure. Simulation result demonstrates the effectiveness of the BLRM in achieving fast
recovery.
To estimate the link loss rates using network tomography, this paper proposes a Fast Path-based Approach (FPA) by
explicit estimation. Instead of inferring the link loss rates directly, we first infer the path loss rates from which we can
easily derive the link loss rates. In addition, the path loss rates are inferred by a new estimator which is an explicit
function of loss observations. The presented estimator is analytical and only requires simple arithmetic calculation. It is
also proved to be consistent and have the same asymptotic variance as that of the maximum likelihood estimator (MLE).
The simulation results show that the FPA can accurately estimate the link loss rates.
KEYWORDS: Switches, Transform theory, Fluorescence correlation spectroscopy, Local area networks, Data communications, Microwave radiation, Failure analysis, Network architectures, Information science, Standards development
Ethernet is now expanding into the metro area networks. To address the fast recovery and load balance issues in Metro
Ethernet, we propose a multiple self-protected spanning trees based architecture. A self-protected spanning tree can
recover from the link failure without the help the other spanning trees, which is different from the spanning trees in all
the previously advocated Multiple Spanning Tree Protocol (MSTP) based architectures. The Single Link Replace
Mechanism (SLRM) is the essential of the proposed architecture. The SLRM transforms a self-protected spanning tree
into another spanning tree by only replacing one link in the tree with another link out of the tree. The SLRM provides a
recovery mechanism by replacing the failed link in the self-protected spanning tree with the normal link out of the tree,
and makes a two-edge connected network survives any single link failure. It also provides an additional load balance
mechanism by changing the topology of the spanning tree, which can not be implemented in the traditional MSTP-based
architectures. The recovery and load balance mechanisms using the SLRM are detailed illustrated and evaluated using
the sample networks. Simulation results demonstrate the effectiveness of the SLRM in achieving fast recovery and
dynamic load balance.
KEYWORDS: Transceivers, Switches, Switching, Green fluorescent protein, Signal attenuation, Field programmable gate arrays, Control systems, Signal detection, Circuit switching, Standards development
Ethernet has been a hotspot in industrial communication. Its intrinsic non-determinism and slow failure recovery mechanism are two major obstacles of Ethernet's application in the industrial environment. To address these two problems, this paper proposes a novel fast recovery and real-time optical industrial Ethernet architecture based on dual-ring topology, and presents some test results from our partly implementation of the architecture. First, resource utlilization of the FPGA implementation shows that the proposed architecture is cost effective. Second, it is seen that recovering from a single failure costs no more than 30 ms, far less than traditional resilience techniques in Ethernet. Besides, end to end delay with no background traffic, which is instructive to the future design of the scheduling algorithms, is also presented.
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