Networking

Where's The WAN Going?

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Networking expert Greg Ferro explains how the wide area network must evolve to keep up with modern technology demands.

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OrhanErgun
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OrhanErgun,
User Rank: Moderator
11/1/2014 | 12:20:23 PM
Re: Depends
@Jerome,

Thanks for the comment. As far as I am aware , Google use SDN for their datacenter Interconnect thus traffic engineering over the WAN.

This is important and common use case especially for the Enterprise who doesn't have their white box switches and doesn't want to complicate their WAN with MPLS Traffic Engineering or IGP tunning so on.

Question is when and how SMB will use SDN and what will be the cost , complexity , implementation , speed and feed so on for these range of companies.

 
Jerome Amon
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Jerome Amon,
User Rank: Ninja
10/28/2014 | 10:57:45 PM
Re: WAN update
Hi Greg, thanks for the answer, very helpful the interview.

As i said, these kinds of design and technologies mentioned when we talk about iWAN or SD-WAN (thanks thanks for clarifying if possible, Cisco's view or ? ) have been used. And the approach of SDN is more new, so concretely what did we add ? in others word could you clarify this "a device centric view" a scenario or picture ?  Thanks thanks for the details and explanations!!!
Jerome Amon
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Jerome Amon,
User Rank: Ninja
10/28/2014 | 10:03:01 PM
Re: Depends
Thanks Orhan again for this real world advices. Please, in this case is the combinaison of all these methodes and techno that bring the intelligent into WAN and give the name SD-WAN ? or are there others components ? or ...., could you explain more your last sentence [some real world scenarios or examples are welcome :) ], thanks. Great ressource!!!
EtherealMind
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EtherealMind,
User Rank: Ninja
10/27/2014 | 11:01:12 AM
Re: WAN update
I see the answer as complex. On one hand, bandwidth with increase for cloud storage, cloud access and other applications. 

Many branch locations are likely to replace private WAN with Internet, and possibly run an encrypted overlay network. This will work best with high speed Internet thus replace a 10MB private WAN with 100MB Internet will still save money and probably improve performance overall. 

Performance guarantees are less important is there is "too much bandwidth" but some dedicated WAN will be needed by some companies. 

And maybe we will see SDN solutions that make operating combinations of Public/Private WAN on a service-by-service basis. Thus IP Communications using private WAN while public WAN (over Internet) would be used for bulk services or services that a latency tolerant such as email. 

But all of these are dependent on moving away from a device centric view. 

 

greg

 

 

 
Amit Agrawal,
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Amit Agrawal,,
User Rank: Apprentice
10/27/2014 | 5:49:05 AM
Re: WAN update
@AbeG, good point. The traffic on traditional WAN is likely to reduce in my opinion too given the wide deployment of cloud architecture today but at the same time I believe, it heavily depends on the type of industry the customer belongs to..for eg. an ITeS enterprise may continue to exploit WAN/MPLS as they cannot put data on cloud due to client restrictions, voice based BPOs also in similar way would continue to use point-to-point links or MPLS.
OrhanErgun
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OrhanErgun,
User Rank: Moderator
10/25/2014 | 11:52:31 AM
Depends
WAN can be classified from your branch to HQ or POP , or maybe to the data center or even between the data centers. So depends on the traffic , sending them to different links is very common. For example between the data centers , backup , VMotion or any other data center interconnect traffic is sent from one link and the latency, jitter and loss sensitive storage traffic from the others.

Or from branch to HQ or DC traffics. Latency, jitter and loss sensitive real time traffic might be sent through MPLS but less critical WEB traffic ( depends on business requirements ) might be sent over DMVPN through Internet and so on.

So flow based forwarding or classfying traffic at the edge and send them over the links which supports the traffic requirements are commonly implemented through DSCP marking , PFR , OER , MPLS Traffic Engineering and so on and What Greg says are important. He mentioned that we need also simplicity and SDN will promise to bring it. Definitely SDN will find a more use case on the WAN and Google and other big enterprises already use it over the WAN.
Jerome Amon
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Jerome Amon,
User Rank: Ninja
10/24/2014 | 8:12:01 PM
Re: WAN update
Hi everyone,

@ Hi Sue, thanks for this video as promised. Very educative thanks Greg. As you and my predecessors said, the wan need to redesign or rethink to support actual traffic in some cases. I would like to know what are the new technologies (if possible proposed by vendor ) to achieve this purpose ? basically, i know the cisco feature PFR (performence routing) which provide a kind of intelligent into the WAN connections. Please, Greg, someone, can explain some others solutions? what are the main solutions of SD-WAN here? Thanks.
MarciaNWC
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MarciaNWC,
User Rank: Strategist
10/24/2014 | 3:31:53 PM
Re: WAN update
Sue, I think of the WAN in the same way. The increase in the amount of corporate traffic going over the Internet to cloud services is one of the drivers for rethinking the traditional WAN model and towards software-defined WAN, I believe.
Susan Fogarty
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Susan Fogarty,
User Rank: Strategist
10/24/2014 | 2:04:03 PM
Re: WAN update
Abe, that's a great point, and I guess it depends on how enterprises define the WAN moving forward. When I think of it, I actually include cloud services and links over public networks, because your corporate traffic is still involved. But many folks may only think of the WAN in terms of the private network. What do you think?
AbeG
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AbeG,
User Rank: Ninja
10/23/2014 | 4:29:26 PM
Re: WAN update
I'd be interested to hear people's take on whether they expect a considerably lower use of the enterprise WAN now that web applications and cloud services are progressively more common place.  

It used to be the case that dealing with a shared network folder took a bit of ingenuity and careful planning.  However, what sort of traffic really needs to go across a WAN link other than domain controller replication.
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