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NFV

This is a copy of a previous Linkedin Post Dated June 7 2016 which was not present on this Blog.

https://www.linkedin.com/pulse/opnfv-brahmaputra-systems-integration-nfv-vnfs-lutfullah-kakakhel/

OPNFV Brahmaputra is a Lab ready release of OPNFV. One statement is that community driven Systems Integration really is a hard task to accomplish. This becomes especially true if the systems being integrated to form a larger system are actually multiple large open source projects themselves.

To start with OPNFV aims to integrate systems upon which VNFs can be run.

The caption above is heavy. On the one side there is the requirements generating standards bodies block of organizations which produce specifications and define how the system is to run. On the other side there are the code producing development projects which produce open source projects. OPNFV stands in the middle and intends to integrate these individual code projects according to the requirements laid out by the standard bodied and provide a system on top of which VNFs can be run and tested. The reason this task is being run under an umbrella membership based organization such as OPNFV is because it is a repetitive task which every organization will need to do over and over again as soon as new releases of codes are made available for the individual projects.

It might be difficult to picture this to start with but imagine you want to have a lab ready to run and test VNFs. What is the lab composed of? It will have Infrastructure on top of which VNFs can be run. What is this Infrastructure composed of? This Infrastructure will be composed of hardware and a virtualisation layer and hypervisors and networking projects such as OpenDaylight and Openstack and KVM and Ceph all running together to provide a block of Infrastructure virtual compute network and storage (An NFVI Point of Presence) on which VNFs can be run.

Every organization which wants to reach the level of testing VNFs will need such a lab. And then what happens when a new version of OpenDaylight is released or a new version of Openstack is released or KVM or Ceph? Everybody needs to update their labs. OPNFV is a Linux Foundation project which intends to be the focal point of these activities and perform them jointly instead of everybody doing them individually.

It also helps make the system work. A patch to OpenDaylight could work well within OpenDaylight but could break things at System layer when integrating with the rest of the components which make an NFV lab (to be used to runs VNFs). OPNFV aims to be the first systems layer at which point such patches can be spotlighted and returned to the project they came from informing them that at the system levels things get disjointed.

OPNFV according to its initial white paper aims to make this systems testing environment in line with the NFV Architecture References points of Vi-Ha, Vn-Nf, Nf-Vi, Vi-VNFM & Or-Vi.

After the above is clear the figure below can be understood to be a larger system composed of individual projects integrated together with the aim of running VNFs. In the figure below OpenDaylight is one piece (in network), KVM is another piece (in compute), Openvswitch is another piece and Openstack is also one piece. All these when put together provide the infrastructure to run VNFs. Also to be noted is that in the case of OPNFV there are community labs (Pharos Labs) which provide the hardware.

The presence of this combined effort also means that for Network Operators the differentiation in the market is in Service Orchestration. The Virtual Network Functions and the Network Services run on top of them.

 

References:

http://www.etsi.org/technologies-clusters/technologies/nfv

http://www.slideshare.net/CiscoDevNet/devnet-1162-opnfv-the-foundation-for-running-your-virtual-network-functions

https://www.opnfv.org/brahmaputra

http://www.slideshare.net/OPNFV/opnf-brahmaputra-an-early-look

https://www.opnfv.org/sites/opnfv/files/pages/files/opnfv_whitepaper_092914.pdf

https://www.youtube.com/watch?v=Dh55McgHGQ8

This is a copy of a previous Linkedin Post Dated June 7 2016 which was not present on this Blog.

https://www.linkedin.com/pulse/nfv-mwc-2016-syed-habib-lutfullah-kakakhel/

ETSI showcased a practical implementation of NFV at the Mobile World Congress 2016. They showed the whole NFV Architecture being implemented and run to provide a SIP voice call. An end to end communication service of a SIP call was made based on a vIMS platform. This vIMS is an NFV VNF orchestrated by a NFV Orchestrator run on top of Infrastructure controlled by an Openstack based VIM. Let’s see the components and how they made the NFV based SIP voice call.

There are two NFVI PoPs (Points of Presence) or two VIMs. One is Openstack controlled and the other is controlled by openvim (part of OpenMano package). Both are controlled by the Open Mano NFVO for resource orchestration. The Service Orchestration is performed by Ubuntu’s Juju.  The launchpad of Rift.io is used as triggering mechanism for resource orchestration and service orchestration. 6wind provides the PEs showcasing corporate VPN interconnectivity. Telefonica provides the traffic generator to test the bandwidth capacity of the PE links and Metaswitch provides the VNF vIMS Clearwater for being run atop the infrastructure.

The figure below shows details:

A multi-site corporation’s network is shown to be running connected via 3 PEs. One site which is connecting to PE 3 has the VNF deployed in VIM2 which is another Data Center. One NFVI PoP labelled VIM 1 is hosting the 6wind PEs while the second NFVI labelled VIM 2 is hosting the VNF. There is interDC communications going on between the two NFVI PoPs. The figure below shows the SIP voice calls communication logical path. The IMS protocols SIP signaling is implemented in VIM 2 in the Metaswitch Clearwater vIMS.

More details can be seen here.

ETSI’s new initiative is delivering an open source NFV Management and Orchestration software stack which is set take away attention from the MANO and turn it into a given piece of software. This puts more focus on the VNFs. The message could be that Service Orchestration using VNFs are therefore to be the focus of attention for Telco organizations.

References:

https://osm.etsi.org/

http://www.etsi.org/technologies-clusters/technologies/nfv

https://networkbuilders.intel.com/docs/E2E-Service-Instantiation-with-Open-Source-MANO.pdf

https://www.youtube.com/watch?v=JJlxwJStkTk

This is a copy of a previous Linkedin Post Dated June 7 2016 which was not present on this Blog.

https://www.linkedin.com/pulse/nfv-telco-vepc-solutions-syed-habib-lutfullah-kakakhel/

In telecom networks the option to place an LTE vEPC stands out as an exemplary demonstration of NFV’s application. The figure below gives the generic NFV Architecture. It be divided into 3 main sections:

  1. The Management and Orchestration
    1. Consists of NFV Orchestrator, VNF Manager and Virtualization Infrastructure Manager.
  2. The NFVI – NFV Infrastructure
    1. Consists of Hardware, Virtualization Layer and Compute, Storage, Network Virtualization Software
  3. The VNFs – i.e. the virtual network functions.

The type of function the VNF provides shows what this NFV network delivers. That is if the NFV network delivers as a Network Service an LTE Core end to end communication then there will be EPC functionality implemented and provided by the VNF part of the NFV network.

See the figure below from an ETSI Proof of Concept work.

It shows the vendor CYAN providing NFV Orchestrator (NFVO) and VNF Manager (VNFM). Redhat and Openstack provide the Virtualized Infrastructure Manager (VIM). The figure also shows the relevant Infrastructure hardware and hypervisor software solutions. Finally it shows the VNFs as being Connectem’s vEPC. If the VNF was implementing a different functionality say it was a vIMS then the rest of the components in the figure could be the same and the end to end Network Service being provided by the NFV network would be different. Therefore the function implemented inside the VNF defines what service the NFV network provides. Therefore the work done by the VNF decides whether your NFV network is Telco or Enterprise; LTE or WiMAX; LTE or 3G etc.

For a list of possible Telco VNF’s see the figure below.

Every chuck of functional blocks could be implemented together as a VNF. So what Connectem is doing is implementing the LTE MME, SGW, PGW, HSS, PCRF functionality and packaging it as a VNF which can be run atop virtualized infrastructure. In the ETSI Proof of Concept, Connectems solution therefore does this according the NFV specifications so that the VNF can be managed by a VNFM and its infrastructure is composed so as it can be managed by a VIM and all this can be controlled and coordinated by an NFVO i.e. NFV Orchestrator. Therefore you get an LTE EPC functionality inside the virtualized NFV environment.

The ETSI definition of a VNF is that a VNF is “a Network Function capable of running on NFV Infrastructure (NFVI) and being orchestrated by a NFV Orchestrator (NFVO) and VNF Manager”.

Coming back to our vEPC example the VNF has components. These VNF Components (VNFCs) can logically be pictured as below:

ETSI mandates that a vendor can choose to implement components as they wish inside the VNF environment as long as they speak to the other NFV architecture components as per their defined VNF interfaces. This means that the different components can utilize efficient compute storage and networking procedures instead of the standards body defined communication methodology. An example is that inside the vEPC software the MME will communicate with the SGW but will utilize efficient computational methodology instead of the 3GPP defined interfaces. If for some reason (say a lab environment) a vendor chooses to implement the 3GPP interfaces inside their vEPC it won’t be as fast and as efficient but it can be used to showcase 3GPP communications inside NFV.

Good VNFCs software design is what will distinguish different providers of vEPC software solutions.

References:

http://www.etsi.org/technologies-clusters/technologies/nfv

https://www.opennetworking.org/images/stories/sdn-solution-showcase/germany2015/CENGN%20-%20NFV-based%20LTE%20Core%20in%20the%20Cloud.pdf

http://nfvwiki.etsi.org/images/NFVPER%2814%29000010r2_NFV_ISG_PoC_Proposal-E2E_vEPC_Orchestration.pdf

This is a copy of a previous Linkedin Post Dated May 16 2016 which was not present on this Blog.

https://www.linkedin.com/pulse/nfv-mano-management-orchestration-syed-habib-lutfullah-kakakhel/

MANO is the brain of the NFV Network. It is the part of the network through which control operations are performed on virtual network functions and virtual network functions infrastructure.

One set of v-eNB, vMME, vSGW, vPGW, vPCRF can be assumed to be a Network Service. Each of the above v’s provide distinct Network Functions which with the v’s are deployed as Virtual Network Functions on Virtual Network Functions Infrastructure. The Virtual Network Functions Infrastructure is hardware with the virtual abstraction layer providing virtualization. These are the acronyms.

Multiple virtual network functions are connected together, or chained together, to provide a network service. The physical links are in the infrastructure which is the compute/storage hardware equipment while the logical links are among the VNFs. The endpoint is the Network Service endpoint which is providing service to the end devices.  Between the physical links and the logical links sits the virtualization layer.

The NFVO i.e. the NFV Orchestrator is the part of the network which controls the deployment and operations of virtual network functions.

This is a copy of a previous Linkedin Post Dated May 24 2016 which was not present on this Blog.

https://www.linkedin.com/pulse/nfv-independance-from-hardware-lock-in-lutfullah-kakakhel/

NFV is simple. It’s most simplistic distinction is that it is the Telecom Operators name for hardware independence and software dependence. Hardware is locked in while software is more easily changed (a project manager would say: relative to hardware that is).

We can try to see what problem NFV seeks to solve.

Telecom operators faced a dilemma about hardware. “To launch a new network service often requires yet another variety (of hardware) and finding the space and power to accommodate these boxes is becoming increasingly difficult; compounded by the increasing costs of energy, capital investment challenges and the rarity of skills necessary to design, integrate and operate increasingly complex hardware-based appliances.”

The sentence starts with “to launch a new network service often requires yet another variety” (of hardware). Remember they want to compete with the Whatsapp’s and Viber’s of tomorrow and need agility of deployment.

NFV seeks to provide that ‘Agility of Deployment’ of new network services to Network Operators by taking away dependency on proprietary and vendor locked in hardware. That is the high level purpose.

The rest is architecture. Hardware can be any compute(r) node with associated storage (types) and an accompanied (inter)network of such devices.  Then it follows to make virtual services; Virtual Network Functions with Virtual Network Infrastructure.

To roll out software or new software for a new service is easier than to roll out hardware.

Another primary benefit is elasticity in energy consumption. Energy consumption according to demand. With more control of hardware, which is the energy consuming physical device, via dependence on software this is made possible.

Event Driven Network Automation is a term used to describe what large scale NetOps teams are doing to scale, deploy and manage networking infrastructure.

YAML data formatting and Jinja2 templating with Python glueing and executing.

Ansible/YAML and Netconf/API for configuration, execution operations.

Event Generation using SNMP/Telemetry/BGPMon.

BGPMon looks like it could be used to check up on changes in a Routed Core with BGP based Leaf-Spine Clos Fabric.

Zero Touch Provisioning – ZTP is best suited for quickly bringing up new devices.

An Orchestration-style GUI layer custom made for every domain in the network would definitely be required as well for various aspects of NetOps.

There can be human driven network automation but there can also be event driven network automation which can be termed as ‘closed loop’ with rule based actions defined by humans.

The events driven, closed loop, rule-based-actions execution layer would then be managed by humans. This layer would be evolving and to manage it there would be a requirement of necessary data structuring and scripting skills in addition to being mindful of what the impact is on the network layer (DC or WAN, both).

References:

https://mirceaulinic.net/2017-10-19-event-driven-network-automation/

https://ripe76.ripe.net/presentations/17-RIPE76_-Event-driven-network-automation-and-orchestration.pdf

Network Automation: Template Configurations with Jinja2 and YAML

https://packetpushers.net/back-journey-network-automation-introduction/

https://packetpushers.net/back-journey-network-automation-part-1-zero-touch-provisioning/

https://packetpushers.net/back-journey-network-automation-part-2-ansible/

https://www.ipspace.net/Building_Network_Automation_Solutions

The list of VNFs at the OPNFV website contains 9 Open Source and 5 proprietary VNFs available to them. Of the 9 the most impressive from a Telco perspective is Clearwater vIMS which provides IMS Functionality in a VNF package. This is the VNF that is used during MWC 2016 to demo the OSM project by ETSI as well. They make a SIP call using it.