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 -- http://www.richardclegg.org/node/18

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

Authors: 
Brandon Heller, Rob Sherwood and Nick McKeown
Published: 
HotSDN

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

Authors: 
Vasileios Kotronis, Xenofontas Dimitropoulos and Bernhard Ager
Published: 
HotNets

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

Authors: 
Eyal Zohar, Israel Cidon and Osnat Mokryn
Published: 
SIGCOMM

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

Authors: 
Hitesh Ballani, Paolo Costa, Thomas Karagiannis and Ant Rowstron
Published: 
SIGCOMM

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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