Due to the growing demand of flexible resource management for cloud computing services, researches on live virtual
machine migration have attained more and more attention. Live migration of virtual machine across different hosts has
been a powerful tool to facilitate system maintenance, load balancing, fault tolerance and so on. In this paper, we use a
measurement-based approach to compare the performance of two major live migration technologies under certain network
conditions, i.e., VMotion and XenMotion. The results show that VMotion generates much less data transferred than
XenMotion when migrating identical VMs. However, in network with moderate packet loss and delay, which are typical in
a VPN (virtual private network) scenario used to connect the data centers, XenMotion outperforms VMotion in total
migration time. We hope that this study can be helpful in choosing suitable virtualization environments for data center
administrators and optimizing existing live migration mechanisms.
This article presents an FPGA-based Dynamic Multicasting emulator for Wide-Area Transport Networks. We setup overlay prototype network environment based on the emulator and compare the performance of pure IP multicasting and Layer 2 multicasting.
This paper presents a multicasting extension to OIF User Network Interface (UNI) standard, which allows dynamically setup/teardown/graft/prune a transport network multicasting tree. Transport network multicasting tree means a point-to-multipoint connection that originates from an ingress Transport Network Element (TNE) port and end at multiple egress TNE ports across the transport network for transporting user services. A global multicasting tree ID is defined to identify the transport network multicasting tree. Without addition of any new abstract messages, we just add some new attributes to existing UNI abstract messages to implement the signaling actions needed to support optical multicasting. Experimental results show the performance of our proposal under different strategy.
Constraint-based routing algorithms are a key component to meet various requirements subjects to a set of constraints for bandwidth requests in the GMPLS-based optical networks. The purpose of GMPLS control plane is to provide an intelligent automatic end-to-end label switched path provisioning/signaling framework to support arbitrary bandwidth traffic. We developed a detailed simulation platform for an IP-over-MPLS-over-WDM network, so that extensive simulations are carried out to evaluate the network performance of various routing algorithms and routing strategies with RSVP-TE or CR-LDP signaling protocol in GMPLS-based IP/MPLS optical networks in terms of blocking probability. The simulation results show that the signaling protocol improves the network performance more significantly than multi-fiber configuration and CR-LDP signaling mechanism outperforms RSVP-TE in all cases. Furthermore, the LCF routing strategy also has better performance than LCL strategy.
Internet backbone network is undergoing a large-scale transformation from the current complex, static and multi-layer electronic-based architecture to the emerging simplified, dynamic and single-layer photonic-based architecture. The explosive growth in the Internet, multi-media services, and IP router links are demanding the next generation Internet that can accommodate the entire traffic in a cost-effective manner. There is a consensus in current industries that IP over WDM integration technologies will be viable for the next generation of the optical Internet where the simplified flat network architecture can facilitate the networking performance and the networking management. In this paper, we firstly propose a novel node architecture-Terabit Optical Router (TOR) for building the next generation optical Internet and analyzes each key function unit of TOR including multi-granularity electrical-optical hybrid switching fabrics, unified control plane unit and so on. Secondly, we discussed the unified control plane unit of TOR in detailed Thirdly we describe our cost vs. performance analysis for various application of TOR. According to our evaluation carriers can get a cost reduction of more than 60 percent by using the TOR. Finally, we reach conclusions that TORs rather than OBS or BFR(Big Fat Router) routers, a cost effective multi-granularity switching and routing technique, are feasible to build the next generation Internet.
Internet backbone network is undergoing a large-scale transformation from the current complex, static and multi-layer electronic-based architecture to the emerging simplified, and dynamic and one-layer photonic-based architecture. The explosive growth in the Internet, multi-media services, and IP router links are demanding the next generation Internet that can accommodate the entire traffic in a cost-effective manner. There is a consensus in current industries that IP over WDM integration technologies will be viable for the next generation of the optical Internet where the simplified flat network architecture can facilitate the networking performance and the networking management. In this paper, we firstly propose a novel node architecture-Terabit Optical Router (TOR) for building the next generation optical Internet and analyses each key function unit of TOR including multi-granularity electrical-optical hybrid switching fabrics, unified control plane unit and so on. Secondly, we give the unified routing definition of multi-layer in TOR and present control plane software structure with emphasis on multi-layer routing issues. Thirdly we describe our cost vs. performance analysis for various application of TOR. According to our calculation, we can get a cost reduction of more than 60 percent by using the TOR. Finally, we reach conclusions that TORs rather than OBS/OPS-based optical routers or big fat router, a cost effective multi-granularity switching and routing technique, are feasible to build the next generation Internet in the coming 5-10 years.
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