Sudden Explosion of Data Centers in India

 

Something very interesting is happening in the Indian telecom space these days.

The Indian government is considering a new data localisation law that would require all data around Indian citizens to be stored locally, i.e., within Indian borders. It starts with the fintech companies first, and would then bring in the social media and other IOT companies storing data in its ambit. The Reserve Bank of India (RBI) has cheerfully given a deadline to all fintech companies to ensure that the entire data operated by them, is stored in data centers only in India. Ouch.

RBI so far has refused to accept the representations made by the fintech companies to relax the norms. It’s ruled out the option of data mirroring while addressing the arguments of technological hurdles raised by the fintech companies. It’s instead suggested that companies opt for cloud services or private clouds in order to ensure data localization.

So, what’s data localisation? Data localisation is the process localising the citizen’s data to one’s home country for its processing, storage and collection before it goes through the process of being transferred to an international level. It’s done to ensure the country’s data protection and privacy laws. It is based on the concept of data sovereignty that was inspired by Snowden’s revelations that that the US was collecting vast swaths of data not only from American citizens, but from around the world.

This move by India is not unprecedented. Nigeria, Russia, Germany and China already have strict regulations around storing their citizens data locally.

Given the fintech and the digital currency boom in India (largely supported by the Indian government) we are looking at a prodigious amount of very sensitive financial data that would be generated and stored in India. Master card and other payment gateways have already started moving the data to the servers within Indian borders . WhatsApp Pay is unable to launch in India because it’s still not compliant with the Indian data localisation policies. Not surprisingly WhatsApp Pay has agreed, and it will take off as soon as they move all the Indian users data inside the Indian borders.

And to make things more lively, the Government of India is also working on a draft e-commerce law that requires firms to locally store “community data collected by Internet of Things devices in public space” and “data generated by users in India from various sources including e-commerce platforms, social media, search engines, etc.”

The direct consequence of this is a frenzied interest in building massive data centers in India. The chairman of Adani Group in an interview with Bloomberg said that he would invest over $10 billion to set up data centres in India. Meanwhile in Mumbai, Hiranandani real estate group too has thrown its hat in the ring and has not very surprisingly, announced ambitious plans to build — guess what — data centres in India.

Group CEO Darshan Hiranandani sagely says that “It is like building a school or hospital”.

The only difference being that Hiranandani gets a bigger bang for its buck when it builds a data center vis-a-vis building, say, a school or a hospital. The real estate market in India has seen unprecedentedly low returns and many indian real estate developers are at risk of going belly-up as mounting stress in the nation’s credit market dries up funding even for those willing to pay decade-high rates. All reports seem to indicate a moribund growth rate in the housing market.

So, what does Hiranandani, one of India’s biggest real estate company do?

They decide to invest heavily in building data centers. All done under the brand name Yotta. Adani and Hiranandani want to set up Indian data centers in order to prevent what Mukesh Ambani in December last year said, “Data colonization is as bad as the previous forms of colonization. India’s data must be controlled and owned by Indian people — and not by corporates, especially global corporations.”

Dr Niranjan Hiranandani – Founder & Managing Director – Hiranandani Group says, “The Digital India program is one of the key pillars of Prime Minister’s vision of India becoming a 5-trillion Dollar economy by 2025. We envision a huge opportunity with data localization and protection act to be announced soon by the Government of India in order to regulate the data management business.  This will give a big impetus to the data storage business to grow domestically at an exponential pace bringing the paradigm shift to the Indian Economy”.

Somebody clearly has his priorities set right.

There’s a massive explosion in data being generated by connected internet users in India. According to a report by real estate and infrastructure consultancy Cushman and Wakefield, the size of the digital population in India presents a huge potential demand for data centre infrastructure.

 

Digital data in India was around 40,000 petabytes in 2010; it is likely to shoot up to 2.3 million petabytes by 2020 — twice as fast as the global rate. If India houses all this data, it will become the second-largest investor in the data centre market and the fifth-largest data centre market by 2050, the consultancy has forecast.

And its just not the fintech companies that are rushing to store Indian data locally, the other social media and IOT companies are following suit. China’s ByteDance has announced that they would be building data centers in India. All the data around Indian users was currently stored in third-party data centers in the US and Singapore. It will now be moved to India. It’s only a matter of time, and other social media companies will cave in, and open their data centers in India. The market size and business potential in India is too huge to be risked.

I came up with this partial list of planned and ongoing investments in data centers in India:

  • Microsoft continuing to manage and expand three Azure cloud service data centers in Mumbai, Pune and Chennai
  • IBM’s plans to set up its second data center in India in addition an existing one in Mumbai
  • Google Cloud Platform recently entered India
  • Alibaba Cloud launched in Mumbai in January 2018
  • Amazon Web Services has seen a 60% increase in customers across Mumbai since launch
  • CtrlS has launched a $73 million project in Bangalore and will be adding new centers in Hyderabad and Mumbai within three years
  • GPX Global Systems planning a 16 MW center in Mumbai to be finished Q1 2019
  • The state of Tamil Nadu has completed a $9 million center in Tiruchirappalli to back up government data
  • Netmagic Solutions is spending $175 million to complete centers in Mumbai and Bangalore by the end of April
  • ESDS Software & Nxt Gen Data Center & Cloud Technologies have announced funding & expansion plans in the near to medium term.
  • Ascendas-Singbridge is investing $1 billion on new construction in Chennai, Mumbai, and Hyderabad

So far, no definitive decision around the data localisation policy has been taken and a draft Personal Data Protection Bill has been submitted that recommends setting up a data protection authority and placing restrictions on cross-border data flows. The bill mandates storing one serving copy of all personal data within India. It empowers the central government to classify any sensitive personal data as critical personal data and mandates its storage and processing exclusively in India.

The bill is yet to be cleared by the cabinet but is listed to be tabled in Parliament during the ongoing budget session. Many people believe that the bill will claw through the opposition since there is a very strong lobby behind this.

Independent of what happens with the bill in this particular parliament session, we will, one way or the other, see a massive growth in data centers in India. The amount of data being generated in India is too valuable to be lost, and the Indian government will not want to lose that “oil”.

dt_c120622

Unlike the Dilbert strip above, one needn’t try too hard to make building data centers look like a good investment. Look around, and you’ll see the winds of changing blowing.

Smells like an opportunity to me.

And for anybody else who is in networking and the data center space.

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SDN with Big Data Analytics for an Intelligent Network

Software, cloud computing and IOT are rapidly transforming networks in a way, and at a rate, never seen before. With software-as-a-service (SaaS) models, enterprises are moving more and more of their critical applications and data to public and hybrid clouds. Enterprise traffic, that never left the corporate network, is now shifting to the Internet, reaching out to different data centers across the globe. Streaming Video (Netflix, Youtube, Hulu, Amazon) accounts for an absurdly high percentage of traffic in the Internet and content providers have built out vast content distribution networks (CDNs) that overlay the Internet backbone. Higher resolutions (HD and UHD) will increase the traffic further, and by some accounts, will be over 80% of the total network traffic by 2020. More and more businesses are being created that reach their customers exclusively over the Internet (Spotify, Amazon, Safari, Zomato, etc). Real-time voice and video communications are moving to cloud-based delivery and network operators are challenged to deliver these services without impacting user quality of experience. And if this was’nt enough, with the advances being made in IOT, we have more devices than ever, lively communicating and chatting in real time over the Internet.

Security becomes a prime concern as more business critical applications migrate to the cloud. The number of DDOS attacks are only increasing and IOT devices can be compromised by hackers to launch some very lively and innovative attacks. A large scale cyber attack in 2016 used a botnet consisting of a multitude of IoT devices such as printers, camera, web cams, residential network gateways, and even baby monitors causing a major outage that brought down a big chunk of the Internet.

All this traffic goes over service provider networks that were built and designed using devices, protocols and management software from the Jurassic age. The spectacular growth and variability of traffic that is experienced today was not anticipated when these networks were built. There is a dire need to cope with changing traffic patterns and to optimize the use of available network resources at all levels (IP, MPLS and Optical) — we’ll talk about the multi-layer SDN controller that optimizes the IP-Optical layers some other time.

Given these challenges, its imperative that service providers work towards gaining realtime visibility into the network behavior and extract actionable insights needed to react immediately to network anomalies, changing traffic patterns and security threats and alarms.

And this is where big data analytics, like a knight in the shining armour, comes in.

Given the data rates that we are dealing with, and the rate at which traffic volumes and speeds are growing, deep packet inspection at line rate gets ruled out in most parts of the network. There is only so much that one can do with hardware’s brute force approach. Additionally, with most traffic being encrypted, DPI offers limited — no, zero — insight into whats happening in the network.

What can help at the scale that networks run today is streaming telemetry combined with big data analytics. Instead of constantly polling the devices in the network and then reacting to what is learnt, the new age mantra is for these devices to periodically push the relevant statistics to the data collectors, which can analyse this data and act based on that. One can argue that streaming network telemetry may not even require an IETF standard in order to be useful. A standard format like JSON could be used, and it’s up to the collector to parse and interpret the incoming barrage of data. This allows network operators to quickly write dev-ops tools that they can use to closely monitor their network and services. This opens up room for hyper innovation where new-age startups can quickly come up with products that can smartly mine the data from the network and draw rich insights into whats happening that can help the service providers in running their networks smarter and hotter.

Big data analytics entails ingesting, processing and storing exabytes worth of network data over a period of time that can be analysed later for actionable insights. With advances made in streaming analytics, this analysis can also happen in real time as the data comes piping hot from the network. New age scalable stream processors make it possible to fuse data streams to answer more sophisticated queries about the network in real-time.

By correlating data from sources beyond traditional routing and networking equipment (IX router-server views, DNS and CDN logs, firewall logs, billing and call detail records) it is possible for the analytics engine to identify patterns or behaviors that can not be identified by merely sifting through the device logs (collected traditionally using SNMP, syslogs, netflow, sflow, IPFIX, etc). The ability to correlate telemetry data from the network with applications such as Netflix or Youtube or SaaS applications such as an iOS upgrade can provide insights that can never be found with traditional traffic engineering approaches.

I claim that we now have the smarts to avoid the famous iOS7 meltdown that happened when iOS7 was released. Let’s see how:

The analytics engine feeding the controller can identify and correlate iOS updates to a new spike — an anomaly — in the network utilization inside an enterprise. The SDN controller can install more specific flows that will steer all iOS update traffic on a different path in the network. This way the controller can automatically adjust the enterprise customer flows to either (i) provide an improved iOS update experience OR (ii) prevent other enterprise traffic to get affected with the iOS update tsunami.  Advanced IP controllers (and those are being demo’ed to several service providers currently) can steer such traffic across multiple ASes as well.

We recently demo’ed a hierarchical SDN controller to a very big customer in Europe. The SDN controller was used to set up inter-domain IP/MPLS services and it used telemetry feeds to determine the realtime link utilization of the inter-domain links. We used that information to place the inter-domain IP services across multiple ASes — the new services were placed on the least utilized inter-domain link at that instance. The services could be moved around as the link utilization changed. This is very different from how its done today, where the BW utilization is reserved and services are placed based on the hard reservations. IMO, the concept of hard reservations will get obsoleted very soon. Why assume that a VPLS service on a link will take up 1Gbps, when the traffic that it “historically” sends never exceeds 100 Mbps?

The figure below shows the different sources feeding into a typical big data analytics cluster that feeds the output to the SDN controller.

Flow telemetry and network telemetry will help in monitoring the traffic flowing inside the service provider networks. We could use this to gain a deep understanding of what a network looks like during normal operations and how it looks like when an anomaly is present in the network.

If one understands the “normal”, the abnormal can become apparent. What comprises abnormal may vary from network to network and from attack to attack. It could include large traffic spikes from a single source in the network, higher-than-typical traffic “bursts” from several or many devices in the network, or traffic types detected that are not normally sent from a known device type. Once the abnormal has been identified, the attacks can be controlled and eliminated.

Network telemetry will also help in peering analytics to select the most cost-effective peering and transit connections based on current and historic traffic trends. Correlating this data with BGP feeds from route servers can help in visualizing how the traffic flows/shifts from one AS to the other.

Data collected from different sources is fed to a scalable publish/subscribe pipeline that feeds this to the big data analytics platform. Some of this can be fed to a real time streaming analytics platform for deriving rich real time insights from the network. This can then be fed to a machine learning cluster for predictive analytics.

The data is stored in a scalable data lake which can be optimized for complex, multi-dimensional queries that becomes the building block for the SDN controller to do something useful. This data can be coupled with the other data that is being learnt off different sources (syslog records, DNS and CDN logs, IX views, etc) and all this can be processed and transformed into actionable intelligence. For example, this can help service providers understand the amount of Facebook, Netflix, Youtube and Amazon Prime Video traffic thats flowing in their networks. It can help them construct a “heat map” of the most active sources and the sinks. Combine this with anonymized subscriber demographics, and the big data analytics framework can provide high fidelity insights into how the subscribers, applications and the network are correlated.

This level of insight cannot be derived by merely observing the telemetry feeds alone since it is not straightforward to correlate flows with specific applications, services and subscriber end points. The ability to mine data from a panoply of sources (as shown on the left side of the figure above — DNS servers, repositories that can identify servers and end points by owner, geo-location, type and purpose) and being able to correlate them is what differentiates the new age intelligent networks from the ones that exist today.

This level of sophistication can not be achieved without a solid big data analytics framework supporting the SDN controller. The limitless potential of what can be achieved will only unfold as more real deployments start happening in the next few years. We’re living in very interesting times, and I’m waiting with bated breath to see what the future holds and how the networking industry becomes “great again”!

Software defined WAN (SD-WAN) is really about Intelligence ..

Lets admit that most of us in the networking domain know as much about SD-WAN as an average 6th grader on sex — which is to say pretty much nothing. We take it as something much grander and exotic than what it really is and are obviously surrounded by friends and well-wishers who wink conspiratorially that they “know it all” and consider themselves on an intellectual high ground to educate us on matters of this rich and riveting biological social interaction. Like most others in that tender and impressionable age, i did get swayed by what i heard and its only later that i was able to sort things out in my head, till it all became somewhat clear.

The proverbial clock’s wound backwards and i experience that feeling of deja-vu each time i read an article on SD-WAN that either extols its virtues or vilifies it as something that has always existed and is being speciously served on a platter dressed up as something that it is not. And like the big boys then, there are men who-know-it-all, who have already written SD-WAN off as something that has always existed and really presents nothing new here. Clearly, i disagree with that view.

I presume, perhaps a trifle rashly, that you are already aware of basic concepts of SDN and NFV (and this) and hence wouldnt waste any more oxygen explaining those.

So what really is the SD-WAN technology and the precise problem that its trying to solve?

SD-WAN is a way of architecting, designing and deploying enterprise WANs using commodity Internet connections in a manner that makes those “magically” appear as a private “MPLS-like” connection. Its the claim that it can appear “MPLS-like” that really peeves the regular-big-mpls-vendors-and-consultants. I will delve into the “MPLS-like” aspect a little later, so please hold on to your sabers till then. What makes the “magic” work is the control plane that implements and enforces the network access policies (VOIP is high priority/low latency/low jitter, big data sync medium priority and all else low priority, no VOIP via Afghanistan, etc) and the data plane that weaves an L2/L3 overlay on top of the existing consumer-grade Internet links (broadband links and in a few cases the LTE/4G connections).

The SD-WAN evangelists want to wean enterprises off their dedicated prohibitively priced private WAN connections (read MPLS circuits) with commodity enterprise broadband links. Philosophically, adding a new branch should just mean shipping a CPE device (perhaps in a virtualized form-factor) that auto-magically dials into a central controller when brought to life. Once thats done and the credentials verified, the branch should just come online (viola!) and should be visible to all the geo-separated branches. Contrast this with the provisioning time (can go as high as a year in some remote locations) and the complexity it takes to get a remote branch online today with MPLS and you will understand why most IT folks have ulcers and are perennially on anti-anxiety/depressant medicines. And btw we’ve not even begun talking about the expenses and long term contracts with the MPLS connections here!

Typically SD-WAN solutions have a central SDN controller which is really a cluster of x86 devices (servers, VMs, containers, take your pick) and hence has computing and analytical horsepower much more than a dedicated HW network device. The controller has complete visibility right from the source all the way till the destination and can constantly analyze traffic and can carve out optimal network paths for applications and individual flows based on the user and application policies. In the first mile the Internet links are either coalesced to form a fatter pipe or are used separately as dictated by the customer policies. The customer traffic is continuously finger-printed and is routed dynamically based on the real time network conditions.

Where most people go wrong is when they believe that SD-WAN solutions lose control over the traffic once it leaves the customer premises or the SD-WAN edge node. Bear in mind that there is nothing in the SD-WAN technology that prevents further control over how the traffic is routed and this could perhaps be one aspect differentiating one SD-WAN offering from the other. Since SD-WAN is an overlay technology you will not have control over each physical hop, but you can surely do something more nuanced given the application and end-to-end network visibility that exists with the controller.

MPLS and SD-WAN !

Its “MPLS-like” in the sense that you can, in most cases, guarantee the available bandwidth and network up time. The central controller can monitor each overlay circuit for loss/jitter/delay and can take corrective actions when routing traffic. Patently enterprise broadband connections in certain geographies dont come with the same level of reliability as MPLS and it behooves upon us to ask ourselves if we need that level of reliability (given the cost that we pay for such connections). An enterprise can always hedge its risks by commissioning a few backup enterprise broadband connections for those rainy days when the primary is out cold. Alternatively, enterprises can go in for a hybrid approach where they maintain a low bandwidth MPLS connection for their mission-critical traffic and use the SD-WAN solution for everything else OR can implement a policy to revert to the MPLS connection when the Internet connections are not working satisfactorily. This can also provide a plausible transition strategy to the enterprises who may not be comfortable switching to SD-WANs given that the technology is still relatively new.

And do note that even MPLS connections go down, so its really not fair to say that SD-WAN solutions stand on tenuous grounds with regard to the reliability. Yes i concede that there are SLAs given with MPLS that just dont exist with regular Internet pipes. However,  one could argue that you can get some bit of extra reliability by throwing in an additional Internet link (with a different provider?) thats only there as a standby. Also note that with service providers now giving fiber connections, the size and the quality of Internet links is only going to improve with time. A large site for instance can aggregate a 1Gbps Google Fiber and a 1Gbps Verizon FIOS connection and can retain a small MPLS connection as the standby. If the enterprise discovers that its MPLS connection is underutilized it can negotiate on pricing or can go with lower MPLS pipe and thereby save on its costs.

I recently read a blog which argued that enterprise broadband promising 350Mbps would mostly give only around 320Mbps on an average. Sure this might be true in a few geographies, but seriously, who cares? Given the cost difference between a broadband connection and an MPLS circuit i will gladly assume that i only had a 300Mbps connection and derive utmost pleasure any time it gives me anything more than that!

The central controller in the SD-WAN technologies amongst other things (analyzing traffic, links) can also continually learn about the customer network conditions and can predict when link qualities will deteriorate and can preemptively reroute traffic before the links start acting up. Given that the controller is monitoring paths end-to-end and is also monitoring and analyzing the traffic emanating from the branch sites there are insights that enterprises can draw that they could have never imagined when using traditional WAN architectures since in that world all connections are really only “dumb pipes”. SD-WAN changes all that — it changes how the enterprise connections and the applications running there are viewed. The WAN architecture is aligned to the application service requirements and its management is greatly simplified. You can implement complex network policies and let the SD-WAN infrastructure sweat on your behalf (HINT: intent driven networking).

So watch out before you disdainfully write off SD-WAN as a technology thats merely replacing your dumb MPLS pipes with the regular Internet connections, since i argue, it can really do a lot more than that. Perhaps a topic worth discussing some other day.

Securing BFD now possible!

Confession Time.

I am guilty of committing several sins. One that egregiously stands out is writing two IETF specs for BFD security (here and here) without considering the impact on the routers and switches implementing those specs. Bear in mind that Bi-directional Forwarding Detection (BFD) is a hard protocol to implement well. Its hard to get into a conversation with engineers working on BFD without a few of them shedding copious quantities of tears on what it took them to avoid those dreaded BFD flaps in scaled setups. They will tell you how they resorted to clever tricks (hacks, if you will) to process BFD packets as fast as they could (plucking them out of order from a shared queue, dedicated tasks picking up BFD packets in the ISR contexts, etc) . In a candid conversation, an ex-employee of a reputed vendor revealed how they stage managed their BFD during a demo to a major customer since they didnt want their BFD to flap while the show (completely scripted) was on. So, long story short — BFD is hard when you start scaling. It just becomes a LOT worse, when you add security on top of it.

The reason BFD is hard is because of the high rate at which packets are sent and consumed. If you miss out a few packets from your neighbor you consider him dead and you bring down your routing adjacency with that neighbor. This causes a lot of bad things (micro-loops, traffic storms, angry phone calls) to happen , least of which trust me, is rerouting the traffic around the “affected” node.

When BFD flaps

The cost of losing BFD packets is very high — so you really want to keep the packet processing minimal, the protocol lean, which is why folks in the BFD WG get a migraine whenever an enthusiastic (though noble) soul mentions a TLV extension to BFD or (even worse) a BFD v2.

Now when you add security, things become a waaaaaaaaaaaaay more complex. Not only do you need to process the packets at a high rate, you also need to compute the SHA or the MD5 digest for each one of those. This becomes difficult when the sessions scale even with hardware assist for BFD.  The current BFD specification for security mandates the digest to be computed for each packet that is sent (you could do something clever with the non-meticulous mode and we’ll talk about it some other day) so the spec is really useless as there is no vendor who can do that at the rate at which BFD packets need to be processed.

This also explains why the BFD specs have not moved further down on the standards track — or simply why they arent RFCs yet.

But there is a need to enhance BFD security, since thats currently the weakest link in the service provider network security. The routing and the signalling protocols have all been enhanced to support stronger cryptographic algorithms and BFD is the only protocol left thats still running without any authentication  (!!!) . I hope this doesnt inspire hackers all around the world to break into the Verizons, the Comcasts and the Tatas. Well, if somebody does, then please pass me a pointer so that i can increase my bandwidth to get all those Pink Floyd bootlegs that i have been scavenging for.

So now, we need  to secure BFD and we are stuck with a proposal that cant be used. Kind of cute, if youre not responsible for running a network.

One way to crack BFD security

The solution to this routing quagmire is however quite simple. I dribbled coffee all over my shirt when i thought of it the first time — checked if I wasnt missing out something obvious and when i was sure that it would hold ground, i pinged one of my co-authors who happened to be thinking on similar lines, and we quickly came up with a draft (after more than a year).

What we’re essentially proposing is this:

Most BFD packets are ping-pong packets carrying same information as was carried in the earlier packets — the payload doesnt change at all (used by most vendors to optimize their implementation — HINT use caching). Only when the state changes, that is, the BFD sessions go Up or Down, or a parameter changes (rarely), does the payload change. Use authentication only when the payload changes and never otherwise. This means that in most cases the packets will be sent in clear-text which can be easily handled as is done today. Only when the state changes, the digest needs to be computed which we know from our extensive experience is a relatively low occurrence event.

This proposal makes it very easy for the vendors to support BFD security, something which folks have been wishing for since long. You can get all the sordid details of our proposal here.

This is the first iteration of the draft and things will change as we move forward. While the current version suggests no changes to the existing BFD protocol, we might going ahead suggest a few changes to the state machine if  that’s what it takes to make the protocol secure. Who said securing BFD was simple ? Its perhaps for this reason that the IETF community still hasnt proposed a solid mechanism for stronger authentication of BFD packets.

You can follow the discussion on the BFD WG mailing list or keep looking at this space for more updates.

Is this draft a reparation for the sins i had mentioned at the beginning of my post earlier?

NFV – CPE vendors MUST evolve!

Customer Premises Equipment (CPE) devices have always been a pain point for the service providers. One, they need to be installed in large large numbers (surely you remember the truck rolls that need to be sent out), and second, and more importantly, they get complex and costlier with time. As services and technology evolve, these need to be replaced with something more uglier and meaner than what existed before. In a large network, managing all the CPEs — right from the configuration, activation, monitoring, upgrading and efficiently adding more services – in itself becomes a full time job (and not the one with utmost satisfaction i must add).

Hate CPEs

ETSI’s Use case #2 describes how the CPE device can be virtualized. The idea is to replace the physical CPEs with all the services it supports on an industry standard server that is and cheaper and easier to manage. Doing this can reduce the number and complexity of the CPE devices that need to be installed at the customer sites.

The jury is still out on the specific functions that can be moved out of the CPE. Clearly, what everybody agrees to is a need for a device that will physically connect the customer to the network. There will hence always be a device at the customer premises. If we can virtualize most of the things that a CPE does, then this device could be a plain L2 switch that takes packets from the customers and pushes those towards the network side.

So what do we gain by CPE virtualization?

You reduce the number of devices deployed at customer premises. Most enterprise customers when adding new services add more devices beyond the access point/demarcation device or NID. If the functions serviced by those devices can be virtualized, then you dont need to add those extra devices.

In residential markets, we can completely remove the set-top boxes (including storage for video recorders) and the layer 3 functions provided by home gateways as these functions can be virtualized (on standard servers driven by highly scalable cloud-based software) , leaving each home with a plain L2 switch. This apparently is already underway as we speak.

Since each site has a vanilla L2 switch, you dont need to replace it till its potent enough to handle the incoming traffic onslaught. Since all the intelligence resides in the standard server, it can easily be replaced/upgraded without involving the dreaded truck rolls.

Truck rolls

Your engineers dont have to visit customer premises for upgrades. Since most of the services are hosted over the cloud, all upgrades happen at the hosting location or the data center. Even if the virtualized services are deployed at the customer premises, you dont have to upgrade each CPE device. Its only the server at the customer premises that needs an upgrade.

Newer services and applications can be easily introduced, since those can be tested out at the hosting location or the data center. You dont have to worry about trying it out on all the different CPE devices. Barrier to entry in the network has suddenly lowered since the legacy CPE equipment doesnt need to be replaced. Also helps avoid vendor lock-in if all CPE devices are plain L2 switches and all the “work” is being done in SW on the standard servers.

Scaling up becomes less of a headache. BGP routers, as they start scaling, run out of control plane memory much before they hit the data plane limits. If the control plane has been virtualized, then its much easier to address this problem vis-a-vis when BGP is running on physical routers.

There are several vendors pushing for CPE virtualization. If you’re a CPE vendor who believes that your services are far too complex to be virtualized, then beware that things are moving very fast in the NFV space. I had earlier posted about how virtual routers can replace the existing harware here. Its fairly easy to imagine CPEs going virtual — from being high end devices to easily commoditized L2 switches! So if you dont evolve fast, then you run the risk of getting extinct!

NFV: Will vRouters ever replace hardware routers?


When i started looking at NFV, i always imagined it being relegated to places in the network that would receive only teeny weeny amount of data traffic since the commodity hardware and software could only handle so much of traffic. I also naively believed that it would be deployed in networks where customers were not uber-sensitive to latency and delay (broadband customers, etc). So if somebody really wanted a loud bang for their buck they had to use specialized hardware to support the network function. You couldnt really use Intel x86-based servers running SW serving customers for whom QoS and QoE were critical and vital. The two examples that leap to my mind are (i) Evolved Packet Core (EPC) functions such as Mobility Management Entity (MME) and BNG environments where the users need to be authorized before they can expect to receive any meaningful services.

While i understood that servers were getting powerful and Intel was doing its bit with its Data Plane Development Kit (DPDK) architecture, it didnt occur to me till recently that we would be seeing servers handling traffic at 10G+ line rate. Vyatta, a Brocade company now, uses vRouters to implement real network functions. Vyatta started with its modest 5400 vRouter that could only handle 1G worth of traffic at the line rate. But then last year it announced 5600 vRouter  that takes advantage of Intel multi-core and DPDK architecture to achieve 10x+ performance. Essentially how DPDK drastically improves the performance is by directly passing the packets from the line card to the code running in the userspace by completely bypassing the high-latency DRAM processing thus speeding up the packet processing. It also supports amongst other things, lockless FIFO implementation  for packet enqueue/dequeue as semaphores and spinlocks are expensive.

The Vyatta 5600 vRouter can be installed on pretty much any x86 based server and can support number of network functions such as dynamic routing, policy-based routing, firewalls, VPN, etc. Vyatta redesigned its software to make use of multiple cores — so while the control plane ran on one core, the data plane was distributed across multiple cores. Using a 4 core processor, they ran control plane on 1 core, and 3 instances of line traffic were handled by the remaining 3 cores.  This way Vyatta was able to handle 10G traffic through a single processor.

Now imagine putting 3-4 such x86 based servers in a network. If (and we look at this in some other blog post) you can split the data traffic equitably, you can achieve close to 30-40G throughput.

Wind River a few weeks ago announced its new accelerated virtual switch (vSwitch) that could deliver 12 million packets per second to guest virtual machines (VMs) using only two processor cores on an industry-standard server platform, in a real-world use case involving bidirectional traffic. 

Many people believe that NFV is best suited to deployed at the edge of the network — basically close to the customers and isnt yet ready for the core or places where the traffic volumes are high or the latency tolerance is low. I agree to this, and covered this aspect in great details here.

What this shows is that its patently possible for virtual routers to run at speeds comparable to regular hardware based routers and can replace them. This augurs well for NFV since it means that it can be deployed in a lot many places in the carrier network than what most skeptics believed till some time back.

NFV and SDN – The death knell for the huge clunky routers?

Last IETF i ran into a couple of hallway discussions where the folks were having a lively debate on whether Network Function Virtualization (NFV) and Software Defined Networking (SDN) will eventually sound the death knell for huge clunky hardware vendors like Cisco, Juniper, Alcatel-Lucent, etc. I was quickly apprised about some Wall Street analyst’s report that projected a significant drop in Cisco’s revenue over the next couple of years as service providers moved to SDN and NFV solutions . I heard claims about how physical routers (that i so lovingly build in AlaLu) will get replaced by virtual routers (vRouters) and other server based software that even small startups could build. The barrier to entry in the service provider markets had suddenly been lowered and the monopoly of the big 3 was being ominously challenged. There was talk about capex spending reduction happening in the service provider networks and how a few operators were holding on to their purchase orders to see how the SDN and NFV story unfurled. There was then a different camp that believed that while SDN and NFV promised several things, it would take time before things got really deployed and started affecting capex spending and OEM’s revenues.

So whats the deal?

Based on my conversation with several folks actively looking into SDN/NFV and a good bit of reading I understand that operators are NOT interested in replacing their edge aggregation and core routers with software driven vRouters. They still want to continue with those huge clunky beasts with full control plane intelligence embedded alongside their  packet pushing data plane. These routers are required to respond to network events in real time (remember FRR?) to prevent outages and slowdowns. Despite all performance improvements the general purpose processors can typically process not more than 2-3 Gbps per core (Intel with DPDK module and APIs for Open Virtual Switch promises better throughput) which is embarrassingly slow when compared to the throughput of 400-600 Gbps thats possible with NPUs and ASICs today. Additionally routers using non-ethernet ports (DSL, PON, Coherent Optical, etc)  cannot be easily virtualized since the general purpose CPUs cannot perform the network functions along with the DSP components required to support these ports.

So while a mobile gateway that essentially forwards packets can be virtualized, it would only make sense to do this where the amount of traffic its handling is relatively small.

So where can we deploy these NFV controlled server based vRouters?

The Provider Edge (PE) routers does several things today, few of which could be easily moved out to be implemented on standard server hardware. ETSI’s NFV Use cases document (case #2)  identifies vPE as a potential NFV use case. The “PE” routers in the MPLS world connects the customer edge (CE) router at the customer premises to the P routers in the provider network. The PE router serves as the service delimiter where it provides L3 VPNs, VPLS, VLL, CDNs and other services to the customers.

The ETSI NFV use-case document (case #2) describes how enterprises are deploying multiple services in branch offices; several of these enterprises use dedicated standalone appliances to provide these services (firewalls, IDS/IPS, WAN optimization, etc), which is “cost prohibitive, inflexible, slow to install and difficult to maintain”.

As a result, many enterprises are looking at outsourcing the virtualization of enterprise CPE (access router) into the operator’s network.

Increased capex and opex pressure is edging enterprises and providers to look at virtualization capabilities made possible by NFV. So, lets look at what all can be virtualized by NFV.

The ETSI NFV use-case document states that “Traditional IP routers  based on custom hardware and software are amongst the most capital-intensive portions of service-provider infrastructure. PE routers run out of control plane resources before they run out of data plane resources and virtualization of control plane functions improves scalability.”

It further states that moving some of the control plane to equivalent functionality implemented in standard commercial servers deploying NFV can result in significant savings.

The figure below gives an idea of the components that can be moved out of the PE router and onto an NFV-powered server.

Network functions/services that can be offloaded from the PE router
Network functions/services that can be offloaded from the PE router

If we’re able to push out the functions/services shown in the figure above, the PE router effectively gets reduced to a router thats mainly pushing the packets out and vPE, the device for service delivery. NFV appears to be most effective at the edge of the network where customers are served — this also happens to be mostly ethernet, which works in the favor of NFV since other ports cannot be served as effectively.

Operators believe NFV can be used for mobile packet core functions for 3G and EPC. LTE operators believe that while basic packet pushing functions must still reside in the routers, the other ancillary functions that have been added to the routers over the time are good candidates for NFV. We can keep BRAS, firewalls, IDS, WAN optimizers, and other service functions separate and use the physical router for merely transferring the packets.

Clearly, the vPE can handle many network functions that are currently done by the conventional physical routers. While the PE may still handle pushing the packets, the intelligence for many of the services typically handled by the PE can be moved to vPE. This is a paradigm shift from what the PE routers have been doing all this while. The network functions and services that can be moved to vPE are:

  • Mobile packet core functions for 3G and LTE EPC
  • Firewalls (FW) and IDS/IPS (Intrusion Detection and Intrusion Prevention systems)
  • Deep Packet Inspection (DPI)
  • CDNs (content delivery networks) and caching
  • IP VPNs – control plane to set up the MPLS VPNs
  • VLLs and VPLS – control plane to set up the MPLS VPNs

These functions can be virtualized to run either on the servers under NFV or can be SDN controlled. Where these reside in the network will depend upon the QoS and QoE (Quality of Experience) required by the customers. If latency and speed is an issue, the functions should reside in servers close to the customers. But if latency is not an issue the functions could reside deep in the provider network or a remote data center.

Conclusion

Operators will deploy NFV and SDN, which will impact their buying decisions. Its clear that they will not be replacing their core and  edge aggregation routers with NFV driven software solutions. Instead, NFV will be used at the edge to offload service functions from the HW PE router onto servers with vPE in the NFV environment to deliver new services agilely to end users and generate higher revenue.

There is thus no need for the Ciscos, Junipers and Alalu’s of the world to worry about falling revenues since the NFV powered solutions are not targeting their highest margain businesses — at least not yet!