Network Management

Software-defined network support for transport resilience

Journal Paper
IEEE/IFIP Network Operations and Management Symposium

This paper is a development of the earlier ideas in PREFLEX --

In this case the focus is resilience within a data centre. In particular resilience at the network layer. If several paths are available to a destination the system known as INFLEX can support fail over between paths seamlessly using OpenFlow. In this case the system is tested using Openvswitch.

The Controller Placement Problem

Brandon Heller, Rob Sherwood and Nick McKeown

Question: Given SDN topology,

  1. How many controllers are needed and

  2. where do they go?

Problems especially in WAN with long propogation delay – affects convergence and availability and informs decision as to whehter control is “real time” or pushed out to forwarding elements.

Motivating examples:

  • Internet2, placing SDN controllers in existing network

  • Aster*x distributed load balancer

  • Flowvizor centralised network slicing tool

Placement metrics:

Outsourcing the Routing Control Logic: Better Internet Routing Based on SDN Principles

Vasileios Kotronis, Xenofontas Dimitropoulos and Bernhard Ager

Claim is for an outsourced control plane for routing which is backward compatible with BGP. Idea is that any “significant sized” networks outsource routing to a contractor specialising in this. Outsourcing party exports to contractor the following:

  • Policies, either directly or derived from SLAs.

  • Topologies and measurement data (jitter, load etc)

  • eBGP sessions – connections to other networks

The power of prediction -- Cloud bandwidth and cost reduction

Eyal Zohar, Israel Cidon and Osnat Mokryn

This paper deals with reducing costs for cloud computing users. Cloud customers use “Traffic Redundancy Elimination” (TRE) to reduce bandwidth costs. Redundant data chunks are detected and removed – cloud providers will not implement middleboxes for this as they have no incentive. The paper gives a TRE solution which does not require a server to maintain client status. The system is known as PACK “Predictive ACKnowledgements” which is receiver driven.

Towards predictable datacenter networks

Hitesh Ballani, Paolo Costa, Thomas Karagiannis and Ant Rowstron

This paper looks at the issue of reducing variability in performance in data centre networks. Variable network performance can lead to unreliable application performance in networked applications – this can be a particular problem for cloud apps. Virtual networks are proposed as a solution to isolate the “tenant” performance from the physical network infrastructure. The system presented is known as Oktopus. The system provides a tradeoff between guarantees to tenants, costs to tenants and profits to providers by mapping a virtual network to the physical network.


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