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DATE 2015-06-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2015-06-10
FROM Ruben Safir
SUBJECT Subject: [NYLXS - HANGOUT] Dynamic Network Stacks

http://www.theregister.co.uk/2015/06/08/sdn_nfv_the_future_or_toast/


Data Centre




More like this

* Cisco
* Hewlett Packard
* Software Defined Networking

* Network Function Virtualisation



Software-defined freedom: A liberating experience for YOU


Breaking through the hardware barricades to a new network state

Protestor barricade image via Shutterstock
8 Jun 2015 at 10:29, Trevor Pott

Software Defined Networking (SDN) and Network Functions Virtualisation
(NFV) are the future – and if you aren't already learning about them
you're probably already doomed. If that strikes you as a little
pessimistic then there is a bright side: most of us are already doing
some of it and we all understand more about it than we think.

SDN is the ability to rapidly detect and adapt to changes in network
infrastructure. This can be, say, the addition of devices or changes in
topology.

NFV is the ability to stand up, tear down, automate and orchestrate
network elements in some easy-to-use manner. Network elements can
include switches, routers, firewalls, Intrusion Detection Systems (IDS),
monitoring, port mirroring and even entire clusters of virtual or
physical server instances.

NFV is frequently lumped in with SDN, as both technologies are highly
complimentary. It is possible to do NFV without SDN (see: /Webmin's
virtual twin/ here
).
It is also entirely possible to implement SDN without layering NFV over
the top.

None of this is new. The "wow" factor to SDN is that instead of having
to log into each switch or router one at a time (via scripts, GUI or
command line), your entire network is orchestrated by some centralised
management server.

Let's consider a few practical examples.


SDN networking gear

The most colour-by-numbers type of hype-compliant SDN today involves
switches that "separate the control plane from the data plane".
Translated into human, this means people are finally making centralised
management for switches so we don't have to log in via telnet or SSH to
every switch on our network.

In practice, SDN means buying inexpensive switches where the hardware
manufacturers don't make a lot of margin and installing expensive
software on it. This is quite a change from the old practice of
expensive hardware and terrible (or no) software.

The expensive software portion of the SDN equation allows switch
configurations to be monitored in real time. When an event occurs (maybe
a dead port, cable out, or switch down) the centralised control server
or servers detect the issue and automatically change relevant network
configurations to keep as many of the network services running as possible.

Consider for a moment a simple network with four switches. Each switch
has a connection to two other switches. Two of the switches connect to
the router that goes out to the internet. Cut any one connection between
the switches and they would still be able to see other switches.

Example of 4 switches for an SDN layout

Basic 4 switch setup with a failed link between switches 1 and 3

Sadly, it's never that simple.

Let's say that the cable between Switch 1 and Switch 3 occupies port 4
on both switches. Every time Switch 1 is asked to find devices that are
attached to Switch 3, it will fire those packets out of port 4, because
that's what Switch 1's map of the network looks like.

If I cut the wire between Switch 1 and Switch 3, several things need to
happen for Switch 1 to continue being able to send packets to devices
located on Switch 3. The first: Switch 1 needs to know that the cable
has been cut. This one's easy; even the dumbest of dumb switches knows
when the cable's out.

Knowing that the cable is out, Switch 1 should now be able to understand
that all those addresses it thought were available via port 4 now
suddenly can't be reached there. This is where things get complicated.

Looking at the network map, we can all clearly see that to get from
Switch 1 to Switch 3, packets need to be sent to Switch 2. Switch 1 is
connected to Switch 2, which is in turn connected to Switch 3. For a
switch, this isn't so easy to understand.


  1. 2015-06-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] jobs
  2. 2015-06-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: [Perlweekly] #201 - Legacy Perl?
  3. 2015-06-01 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] [xdg-at-xdg.me: IBM Watson hackathon, Brooklyn, May 4-5]
  4. 2015-06-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Logicworks
  5. 2015-06-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Artifical Intelligence Workshop cancelled tonight for Space Program
  6. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] making money with open source - John Walker
  7. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Rockstar
  8. 2015-06-02 Ruben <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] openrc distorwatch
  9. 2015-06-02 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  10. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] 3d scanning and virtualization
  11. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] 3d scanning and virtualization
  12. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  13. 2015-06-02 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] [announce-at-lists.isoc-ny.org: =?utf-8?Q?=5B?=
  14. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] future tech control
  15. 2015-06-02 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  16. 2015-06-02 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  17. 2015-06-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] $9 SOC
  18. 2015-06-02 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  19. 2015-06-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  20. 2015-06-03 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  21. 2015-06-03 Ruben <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  22. 2015-06-03 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  23. 2015-06-03 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  24. 2015-06-03 Ruben <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  25. 2015-06-03 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  26. 2015-06-03 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  27. 2015-06-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Linux Laptops cheap
  28. 2015-06-05 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] making money with open source - John Walker
  29. 2015-06-05 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  30. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  31. 2015-06-05 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  32. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  33. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Tomorrow: Join 20 astropreneurs at "Super-Releaser Presents,
  34. 2015-06-05 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  35. 2015-06-05 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  36. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  37. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Artificial Intelligence
  38. 2015-06-05 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  39. 2015-06-05 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  40. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  41. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  42. 2015-06-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  43. 2015-06-05 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  44. 2015-06-05 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  45. 2015-06-06 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  46. 2015-06-06 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  47. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] this makes me sick
  48. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this makes me sick
  49. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Linux Laptops cheap
  50. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Distro News
  51. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Brooklyn Press
  52. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Journal Meeting
  53. 2015-06-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this makes me sick
  54. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] This weeks schedule
  55. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] http://hadoop.apache.org/
  56. 2015-06-07 Paul Charles Leddy <pcleddy-at-gmail.com> Re: [NYLXS - HANGOUT] http://hadoop.apache.org/
  57. 2015-06-07 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] http://hadoop.apache.org/
  58. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] NBC Job
  59. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] http://hadoop.apache.org/
  60. 2015-06-07 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] [speakers-at-ohiolinux.org: Ohio LinuxFest 2015 Call for Presentations]
  61. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Grunt
  62. 2015-06-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Job Teaching Adrino
  63. 2015-06-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Junior Python
  64. 2015-06-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] fundraiser
  65. 2015-06-09 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] cups security update
  66. 2015-06-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] http://hadoop.apache.org/
  67. 2015-06-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Dynamic Network Stacks
  68. 2015-06-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Movie of the Week
  69. 2015-06-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Movie of the Week
  70. 2015-06-14 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] this just breaks my heart..
  71. 2015-06-14 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [NYLXS - HANGOUT] Fwd: The Best Careers for People With ADHD
  72. 2015-06-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Journal Articles
  73. 2015-06-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Programming and Design contest
  74. 2015-06-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] healthcare premiums
  75. 2015-06-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Tor security
  76. 2015-06-18 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Movie of the Week
  77. 2015-06-18 Elfen Magix <elfen_magix-at-yahoo.com> Re: [NYLXS - HANGOUT] Tor security
  78. 2015-06-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] join me for school with a scholarship from the Linux foundation
  79. 2015-06-19 Ruben <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Tor security
  80. 2015-06-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] interesting Brooklyn business
  81. 2015-06-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Never Forget...
  82. 2015-06-24 Paul Robert Marino <prmarino1-at-gmail.com> Subject: [NYLXS - HANGOUT] something strange a coworker did in fstab
  83. 2015-06-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  84. 2015-06-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  85. 2015-06-24 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  86. 2015-06-24 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  87. 2015-06-24 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  88. 2015-06-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  89. 2015-06-24 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  90. 2015-06-24 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  91. 2015-06-24 prmarino1-at-gmail.com Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  92. 2015-06-25 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  93. 2015-06-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  94. 2015-06-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] something strange a coworker did in fstab
  95. 2015-06-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Exciting News from SF...
  96. 2015-06-25 prmarino1-at-gmail.com Re: [NYLXS - HANGOUT] Exciting News from SF...
  97. 2015-06-25 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Exciting News from SF...
  98. 2015-06-26 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [NYLXS - HANGOUT] Exciting News from SF...
  99. 2015-06-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Linux training
  100. 2015-06-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: strange function types in unistd.h
  101. 2015-06-27 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] Exciting News from SF...
  102. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] I'm a grandfather, or will be in a few hours
  103. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Re: Sleep
  104. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Fwd: Re: Sleep
  105. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] NYLXS deleted
  106. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] South Fallsburg
  107. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Baby it is COLD outside
  108. 2015-06-28 eminker-at-gmail.com Re: [NYLXS - HANGOUT] Baby it is COLD outside
  109. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] South Fallsburg
  110. 2015-06-28 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] Baby it is COLD outside
  111. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Baby it is COLD outside
  112. 2015-06-28 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  113. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  114. 2015-06-28 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  115. 2015-06-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  116. 2015-06-30 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  117. 2015-06-30 prmarino1-at-gmail.com Re: [NYLXS - HANGOUT] Baby it is COLD outside
  118. 2015-06-30 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] NYLXS deleted
  119. 2015-06-30 Rick Moen <rick-at-linuxmafia.com> Re: [NYLXS - HANGOUT] NYLXS deleted

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