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Versions: 00

NFVRG                                                            R. Rosa
Internet-Draft                                             C. Rothenberg
Intended status: Informational                                   Unicamp
Expires: April 21, 2016                                         R. Szabo
                                                                Ericsson
                                                        October 19, 2015


                       VNF Benchmark-as-a-Service
                      draft-rorosz-nfvrg-vbaas-00

Abstract

   Network Function Virtualization (NFV) promises the delivery of
   flexible chaining of Virtualized Network Functions (VNFs) with
   portability, elasticity, guaranteed performance, reliability among
   others.  Service providers expect similar behavior from NFV as their
   current appliances based infrastructure, however, with the ease and
   flexibility of operation and cost effectiveness.  Managing for
   predictable performance in virtualized environments is far from
   straightforward.  Considering resource provisioning, selection of an
   NFV Infrastructure Point of Presence to host a VNF or allocation of
   resources (e.g., virtual CPUs, memory) needs to be done over
   virtualized (abstracted and simplified) resource views.  In order to
   support orchestration decisions, we argue that a framework for VNF
   benchmarking is need.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 21, 2016.








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Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terms and Definitions . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Problem Statement and Challenges  . . . . . . . . . . . . . .   5
   5.  Proposed Approach . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Use Case: Unify Modelling . . . . . . . . . . . . . . . . . .  11
   7.  Related drafts and open source projects . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   10. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  18
   11. Informative References  . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   Network Function Virtualization (NFV) pursues delivering Virtualized
   Network Functions (VNFs) in NFV Infrastructure (NFVI) where
   requirements of portability, performance, elasticity, among others,
   are demanded by carriers and network operators [ETS14a].
   Particularly, in the short term, performance and elasticity are
   important factors to realize NFV concepts [BVLS15].  Associated to
   these goals VNFs need to be deployed with predictable performance,
   taking into account the variable processing overheads of
   virtualization and the underlying available NFVI resources.

   In essence, NFV Management and Orchestration (MANO) plane manages
   infrastructure and network services resources [ETS14c].  This
   involves taking into account performance considerations for VNF-FGs
   allocation (e.g., fulfilling NFVI resources by orchestration
   demands).  Furthermore, when attempting to manage service assurance
   of embedded VNF-FGs [PSPL15] MANO tasks may depend on analytics



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   measurements for scaling and migration purposes.  As a consequence
   Network Function Virtualization Orchestrator (NFVO) needs a coherent
   understanding of performance vs. resource needs for VNFs specific to
   NFVI Points of Presence (PoPs).

   In what follows we motivate the need for a VNF benchmarking, define
   related terms and introduce a framework proposal.

2.  Terms and Definitions

   The reader is assumed to be familiar with the terminology as defined
   in the European Telecommunications Standards Institute (ETSI) NFV
   document [ETS14b].  Some of these terms, and others commonly used in
   this document, are defined below.

   NFV:  Network Function Virtualization - The principle of separating
      network functions from the hardware they run on by using virtual
      hardware abstraction.

   NFVI PoP:  NFV Infrastructure Point of Presence - Any combination of
      virtualized compute, storage and network resources.

   NFVI:  NFV Infrastructure - Collection of NFVI PoPs under one
      orchestrator.

   VIM:  Virtualized Infrastructure Manager - functional block that is
      responsible for controlling and managing the NFVI compute, storage
      and network resources, usually within one operator's
      Infrastructure Domain (e.g.  NFVI-PoP).

   NFVO:  NFV Orchestrator - functional block that manages the Network
      Service (NS) lifecycle and coordinates the management of NS
      lifecycle, VNF lifecycle (supported by the VNFM) and NFVI
      resources (supported by the VIM) to ensure an optimized allocation
      of the necessary resources and connectivity

   VNF:  Virtualized Network Function - a software-based network
      function.

   VNFD:  Virtualised Network Function Descriptor - configuration
      template that describes a VNF in terms of its deployment and
      operational behaviour, and is used in the process of VNF on-
      boarding and managing the lifecycle of a VNF instance.

   VNF-FG:  Virtualized Network Function Forwarding Graph - an ordered
      list of VNFs creating a service chain.





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   MANO:  Management and Orchestration - In the ETSI NFV framework
      [ETS14c], this is the global entity responsible for management and
      orchestration of NFV lifecycle.

   VBaaS:  VNF Benchmark-as-a-Service - is a VNF Profile extraction
      service of a Virtualized Infrastructure Manager (VIM) overseeing
      an NFVI PoP.

   VNF-BP:  VNF Benchmarking Profile - the specification how to measure
      a VNF Profile.  VNF-BP may be specific to a VNF or applicable to
      several VNF types.  The specification includes structural and
      functional instructions, and variable parameters (metrics) at
      different abstractions (e.g., vCPU, memory, bandwidth, delay;
      session, transaction, tenants, etc.).

   VNF Profile:  is a mapping between virtualized resources (e.g., vCPU,
      memory) and VNF performance (e.g., bandwidth, delay between in/out
      or ports) at a given NFVI PoP.  An orchestration function can use
      the VNF Profile to select host for a VNF and to allocate the
      desired resources to deliver a given (predictable) service
      quality.

3.  Motivation

   Let us take an example where a VNF Developer creates a new code base
   for a VNF.  She is able to optimize her VNF for multiple execution
   environments and offers these as a set of different but equivalent
   implementations of VNF1 for Service Providers (SPs) (see Figure 1).
   Orchestration managers (e.g., NFVO) must know adequate infrastructure
   resources to allocate when deploying VNF1, specially if it belongs to
   a network service (VNF-FG) with a target SLA, e.g., min throughput or
   max latency.  However, instances of VNF1 optimized for heterogeneous
   NFVI PoPs may need different resources/settings for the same behavior
   (performance).  Orchestrator (NFVO) needs to take into account all
   these requirements to embed VNFs and allocate proper infrastructure
   resources in accordance with network service intents (SLAs).















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                                  +---------+
         ,----.                   |Customers|
        ( VNF1 )   +----------+   +-+-------+
         `----'    |   VNF    |     |    SAP1 +----+   +----+
            ,----. |Developers|     |     O---|VNF1|---|VNF2|---O
           ( VNF2 )+--------+-+     |         +----+   +----+ SAP2
            `----'          |       |     <========VNF-FG=======>
                          +-+-------+---+
                          | NFVO / VNFM |
                          | (Service    |
                          |   Provider) |
                          +-+----+----+-+
                           /     |     \
                          V      V      V
                   +-------+ +-------+ +-------+
                   |  VIM1 | |  VIM2 | |  VIM3 |
                   +-+-----+ +---+---+ +-----+-+
                     |           |           |
                     |           |           |
                     |           |           |
          SAP1 +-----+-+ WAN +---+---+ WAN +-+-----+  SAP2
             O-| PoP 1 |-----| PoP 2 |-----| PoP 3 |-O
               +-------+     +-------+     +-------+
                PoP1           PoP2            PoP3
                Container      Enhanced        Baremetal
                OS             Hypervisor

             Figure 1: NFV MANO: Customers and VNF Developers

4.  Problem Statement and Challenges

   Previous section motivates NFVO needs of knowledge about correlations
   between VNFs performance and NFVI PoP resources.

   Suppose that specifications, based on developers' definitions, exist
   in VNF Descriptors [ETS14d] describing performance associated to
   specific NFVI PoP resources.  Such VNF, when deployed, may present
   oscillations in its performance because of changes in the underlying
   infrastructure (due to varying customers workloads, traffic
   engineering, scaling/migration, etc).  Therefore, we believe we need
   descriptions on how to benchmark VNFs' resources and performance
   characteristics (e.g., VNF Profiles) on demand and in a flexible
   process supporting different NFVI PoPs, which could create service
   level specification associations.

   Some of the associated challenges are:





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   Consistency:  Will the VNF deployed at a NVFI PoP deliver the
      performance given in the VNF Profile for the NFVI PoP under
      different workloads?  The performance of a VNF may not only depend
      on the resources allocated to the VNF but on the overall workload
      at the target NFVI PoP.

   Stability:  Benchmark measurements need to present consistent results
      when applied over different NFVI PoPs.  How express benchmarking
      descriptions to fit in different virtualized environments?  How to
      uniformly handle service/resource definitions and metrics?

   Goodness:  A given VIM / NFVI PoP may virtualize (i.e., hide) certain
      resource details; hence a benchmark evaluation might be executed
      in a different resource set of the NFVI PoP unlike the final
      production environment.  How good benchmark results can correspond
      to actual workloads in virtualized environments?

   VNF benchmarking service description:  How to define the VNF
      benchmarking process at the abstraction of the corresponding
      component (e.g., VIM)?  How to offer benchmarking as a service to
      be consumed by the different stakeholders?

   VNF benchmarking versus monitoring:  How can a VNF benchmarking
      process complement continuous monitoring of NFVI?  When does a VNF
      benchmarking process surpass in performance and costs the
      execution of continuous monitoring process?  And for which type of
      NFVI PoPs and/or VNFs is it necessary/sufficient?

5.  Proposed Approach

   Definition: VNF Benchmarking as a Service (VBaaS) --  a standalone
      service that can be hosted by orchestration managers (e.g., NFVO)
      to report a VNF Profile.  VBaas might take inputs consisting of
      VNF-FGs determining VNFs to be evaluated under specific NFVI
      targets.  As output, VBaaS returns a Service Graph based on the
      VNF-Benchmark Profile (VNF-BP) containing different parameters
      used to evaluate all required candidates (PoPs) for the specified
      VNF.  Such interactions are abstracted by the VBaaS API.  A VBaaS
      Service Graph is deployed by orchestration managers (NFVO), VBaaS
      receives benchmarking results and builds VNF Profiles.  VNF
      performance values or VNF resource values can be provided, and
      VBaaS can only complement the VNF-FG missing parts to build VNF-
      BPs, or report an existing up-to-date VNF Profile for pre-defined
      values.

   In comparison with Figure 1, the VBaaS approach introduces two
   information bases, a VBaaS component and an API to interact with
   NFVO, as shown in Figure 2.  On one hand, the Network Function



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   Information Base (NF-IB) holds the VNF Profiles and on the other hand
   the VBaaS-IB holds the VNF Benchmark Profiles (VNF-BPs).

   Definition: VNF Profile --  is a mapping between virtualized
      resources of a certain NFVI PoP (e.g., virtual machine with vCPU,
      memory) and VNF performance (e.g., throughput, delay, packet loss
      between in/out or ports).

   An orchestration function can use the VNF Profile to select hosts for
   VNFs in a VNF-FG and to allocate the necessary resources to deliver a
   given (predictable) service quality (SLA).

   Figure 2 shows an example VNF1 and VNF2, which are implemented by a
   VNF Developer, who provides metrics for VBaaS build VNF-BPs.  The
   VNF-BP is then used by VBaaS when NFVO needs to evaluate the
   available NFVI-PoPs for different resources configuration.  In this
   case, NFVO instantiates the VNF-FG (VBaaS Service Graph) as defined
   in VNF1-BP; configures the variable parameters in the configuration
   template, e.g., CPU and memory values and handles the configuration
   file to the measurement controller (part of the VNF-FG definition) to
   execute the benchmarking.  The measurement controller make the
   measurement agents execute the benchmark tests (the execution
   environment might also be monitored by the agents) and reports the
   results back to the VBaaS.  As a result, resource and performance
   associations for the VNF is created for the evaluated the NFVI PoPs
   into the NF-IB.  Figure 2 shows, as an example, that VNF1 needs 2CPU
   (cores) and 8GByte of memory to handle up 10Mbps input rate with
   transaction delay less than 200ms at NFVI PoP1.























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                                             SAP1+----+  +----+
                                              O--|VNF1|--|VNF2|--O
       {VNF1{                                    +----+  +----+SAP2
         VNF-FG,                             <========VNF-FG=======>
         Metrics{            ,----.               +---------+
         {vCPU, mem}->      ( VNF2 ) ,----.       |Customers|
         {BW, Delay}}}       `----' ( VNF1 )      +-+-------+
               ,-------.             `----'         |
              /VBaaS-IB:\         +----------+      |
              \ VNF-BPs /         |   VNF    |      |
               `---+---'       +--|Developers|      |
                   |           |  +--------+-+      |
              _____+___        |           |        |
             |         |<------+       +---+--------++
             |  VBaaS  |<------------->| NFVO / VNFM |
             |___ _____|     VBaaS     | (Service    |
                 +            API      |   Provider) |
                 |                     +-+------+----+
            ,----+-----.                 |      |     \
           /   NF-IB:   \                V      V      V
           \VNF-Profiles/            +-----+ +-----+ +-----+
            '----------'             |VIM1 | |VIM2 | |VIM3 |
     {VNF1: {10Mbps,200ms}{          ++----+ +--+--+ +-----+
       {{2CPU,  8GB}@PoP1}            |         |          |
       {{8CPU, 16GB}@PoP2}            |         |          |
       {{4CPU,  4GB}@PoP3}}}          |         |          |
       {20Mbps,300ms}...}          +--+--+ WAN ++----+ WAN +-----+
       {VNF2:{10Mbps,200ms}{     O-|PoP 1|-----|PoP 2|-----|PoP 3|-O
        {{8CPU, 16GB}@PoP1}   SAP1 +-----+     +-----+     +-----+  SAP2
         ...}}                      PoP1        PoP2        PoP3
                                    Container   Enhanced    Baremetal
                                    OS          Hypervisor

                   Figure 2: NFV MANO and VBaaS Approach

   On the left side of the NFVO in Figure 2 is the resulting NF-IB by
   the application of VBaaS-IB profiles on the extraction of VNFs
   performance characteristics in different NFVI PoPs.  Basically, a VNF
   profile corresponds to performance metrics in different environments.
   For example, VNF1 to offer 10Mbps bandwidth with 200ms latency needs
   (if deployed) in PoP1 2CPU (cores) and 8GB of memory, meanwhile in
   PoP2 requires 8CPU and 16GB.  Similar results can be presented for
   VNF2, if catalogued as a VNF profile.  In this scenario, VBaaS can be
   seen featuring VNFs in different PoPs in an on-demand composition of
   profiles, for example, to be used in provisioning VNF-FGs containing
   VNF1 or VNF2, attending PoPs 1, 2 or 3 resources consumption.  Such
   profiles present performance metrics of VNFs in different NFVI PoPs




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   when, for example, NFVOs need to deploy particular VNF-FGs that
   contain elements already certified in NF-IB profiles.

   Definition: VNF Benchmarking Profile (VNF-BPs) --  the specification
      of how to measure the VNF Profile for a given VNF.  The
      specification includes structural (e.g., measurement components
      defined as a VNF-FG) and functional (e.g., measurement process
      definitions and configurable parameters) instructions, and
      variable parameters (metrics) at different abstractions (e.g.,
      vCPU, memory, bandwidth, delay; session, transaction, tenants,
      etc.).

   Note: a VNF-BP may be specific to a VNF or applicable to several VNF
   types.

   Figure 3 presents details of VBaaS API regarding the interactions
   with NFVO and the construction of VBaaS Service Graphs based on VNF-
   BPs.  As a VNF-FG (deployment request), NFVO demands VNF1 allocated
   to a specific PoP1 and the remaining virtualized view of the current
   resources for the VNF-FG deployment (e.g., interconnected PoPs).
   VBaaS (Manager Service) looks for VNF1-BP in VBaaS-IB, complements
   the requested VNF-FG with benchmark instances (described below) to
   perform evaluations and monitor resources in VNF1 and PoP1.  NFVO
   receiving a VNF-FG reply (deployment order of a VBaaS Service Graph)
   instantiates it as a normal provisioning process of network services.
   Benchmark reports of the deployed VNF-FG are sent to VBaaS and it
   defines the construction of the VNF-Profile associated with that
   evaluation.

   We believe in the existence of VBaaS instances (VNFs) which compose a
   VBaaS Service Graph to perform probing and monitoring activities on
   selected targets (VNF in a specific NFVI PoP).  Those are defined as
   Manager, Monitor and Agent, described in details below.


















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                          +----+
      {VNF1{              |VNF1|
        VNF-FG,           +-+--+                  +-------------+
        Metrics{            |                     | NFVO / VNFM |
        {vCPU, mem}->       | Target              | (Service    |
        {BW, Delay}}}     +-+--+                  |   Provider) |
          ,-------.       |PoP1|   +----+         +-------------+
         /VBaaS-IB:\      +----+<->|PoPs|   VBaaS |(VNF-FG
         \ VNF-BPs /               +----+   API(1)| Deploy)
          `---+---'       VNF-FG                  V
              |           Request      +-------------+
         |----+----|<------------------| NFVO / VNFM |
         |  VBaaS  |    API(2)         | (Service    |
         |-------+-|------------------>|   Provider) |<-+VBaaS API(1)
                 |        VNF-FG       +-------------+  |(   VNF
              API|(3)     Reply                         | Benchmark)
                 V                  +----+       +----------------+
            +-------+               |VNF1|       | VNF Developers |
            |Manager|      +--------+-+--+       +----------------+
            +-+-----+----->|Monitors| |
            +-+--+  |API   +--------+-+--+
            |PoP4|  |(4)            |PoP1|
            +----+  |               +-+--+
                    |  +--------+     |     +--------+
                    '->| Agents +-----'-----+ Agents |
                       +---+----+   Probes  +---+----+
                         +-+--+               +-+--+
                         |PoP2|               |PoP3|
                         +----+               +----+


                           Figure 3: VBaaS APIs

   Agent --  executes active probes using benchmark tools to collect
      network and system performance metrics by interacting with other
      agents.  While a single Agent is capable of performing localized
      benchmarks (e.g., Stress tests on CPU, memory, I/O), the
      interaction among distributed agents enable the generation and
      collection of end-to-end metrics (e.g., packet loss, delay).
      Consider here the possibility of one end be the VNF itself where,
      for example, one-way packet delay is evaluated.  For instance, it
      can be used for probe measurements of throughput and latency in a
      multi-point distributed topology.  Agent's APIs are open and
      extensible (e.g., to plug-and-bench new tools and metrics) and
      receive configuration and run-time commands from the Manager for
      synchronization purposes (e.g., test duration/repetition) with
      other Agent and Monitor instances.




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   Monitor --  when possible it is placed inside the target VNF and NFVI
      PoP to perform active and passive monitoring and metric collection
      based on benchmarks evaluated according to Agents` workloads.  For
      instance, to monitor CPU utilization of NFVI PoP considering
      packet length traffic variations sent by Agents.  Different from
      the active approach of Agents that can be seen as generic
      benchmarking VNFs, monitors observe particular properties
      according to NFVI PoPs and VNFs capabilities.  Monitors can plug-
      and-bench new tools/metrics and maintain an interface with Manager
      to synchronize its activities with Agents.  Besides, they can be
      instantiated, if allowed, inside the target VNF (e.g., as a plug-
      in process in a virtualized environment) to check internal
      behaviours, alongside the VNF deployment environment, i.e., NFVI
      PoP, or in both places.

   Manager --  is responsible for (i) the coordination and
      synchronization of activities between agents and monitors, (ii)
      collecting all benchmark raw results, and (iii) aggregating the
      inputs to construct a profile report that correlates different
      metrics as required by the VNF-BP.  Therefore, it executes the
      main configuration, operation and management actions to deliver
      the results as specified by NFVI PoPs or VNF-BPs (e.g.,
      instantiation of agents and monitors activities along- side tools
      and metrics configuration).  Manager uses APIs to read and set
      configuration parameters for benchmarking instances such as metric
      parameters (e.g., bandwidth or packet loss probes) according to
      the VBaaS process.  APIs are also used to receive benchmark
      instructions from VBaaS and send the reports of finished benchmark
      procedures.

   The benchmarking process, however, can be offered as a service (see
   API (1) in right side of Figure 3).  For example, a NFVO may be able
   to handle a VBaaS-IB and offer a VNF Benchmarking as a Service to its
   client, e.g., another NFVO.  Similarly, a second NFVO may store
   benchmark measurements in its NF-IB so it can report it to multiple
   clients if it shares resources among other NFVOs.  Alternatively, an
   NFVO may offer to it's developers the VNF Benchmarking as a Service,
   to assess the performance of a VNF in the operator's environment.
   This may be part of a DevOps primitive (e.g., VNFs continuous
   integration).

6.  Use Case: Unify Modelling

   Unify looks for a generic description of compute and network
   resources as a yang model named virtualizer [Szab15].  It allows the
   aggregation of resources (e.g., nodes capabilities and NF instances)
   and their abstractions in a structure nicknamed Big Switch with Big
   Software (BiS-BiS) (joint software and network resource abstraction



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   with a joint control API), which allows recursive control plane
   structuring for multi-domain hierarchies.  For example, supported
   network functions of a joint compute and network virtualization (a
   BiS-BiS node) can be described with their associated resources and
   performance mapping, e.g., {cpu, memory, storage} -> {bandwidth,
   delay} (see Figure 5 based on virtualizer xml example in [Szab15]).

   In this example, the interface between NFVOs (Producer and Consumer
   of VBaaS API (1)), as shown in Figure 3, is described by the UNIFY
   virtualization model [Szab15].  Figure 4 shows an example netconf
   message exchange over the domain virtualization model.  First the
   consumer reads in (1) and (2) the virtualization view, which includes
   the supported NFs reported in the capabilities section.  Next in (3)
   the consumer requests a capability report of NF1 at a given
   virtualized node (UUID001), by defining the required delay and
   bandwidth performance parameters of the NF1 (see Figure 5.  This is a
   dimensioning request according to [ETS14t], i.e., the VBaaS service
   must evaluate and provide cpu, memory and storage values at the given
   virtualized node to deliver the given network performance
   characteristics.  The start of the VBaaS process is acknowledged by a
   (4) rpc-ok.  Once the VBaaS process completes a notification is sent
   (5) to the consumer, which reads in (6) and (7) the updates to the
   NF1 capability report, i.e., the missing cpu, memory and storage
   parameters (see Figure 6).



























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               +--------------+   VBaaS    +--------------+
               |Orchestration |   API-1    |Orchestration |
               |  (NFVO       |<---------->|  (NFVO       |
               |   Consumer)  |            |   Producer)  |
               +------+-------+            +------+-------+
                      |   1)get-config()          |
                      |------------------------->>|
                      |     2)rpc-reply(virt)     |
                      |<<-------------------------+
                      |                           |
                      |  3)edit-config(NF1@cap)   |
                      +------------------------->>|
                      |      4) rpc-ok            |
                      |<<-------------------------+--+
                      |                           |  |
                      |                           | VBaaS
                      |    5)<notification>       |  |
                      |<<-------------------------+<-+
                      |   6)get-config(NF1@cap)   |
                      |------------------------->>|
                      |   7)rpc-reply(NF1@cap)    |
                      |<<-------------------------+

        Figure 4: Sequence Diagram of VBaaS API (1) - Multi-Domain
                                Interaction


  <virtualizer xmlns="http://fp7-unify.eu/framework/virtualizer">
      <id>UUID001</id>
      <name>Single node simple VBaaS request</name>
      <nodes>
          <node>
              <id>UUID11</id>
              <name>single Bis-Bis node</name>
              <type>BisBis</type>
              <ports>
                  ...
              </ports>
              <resources>
                  <cpu>12</cpu>
                  <mem>64 GB</mem>
                  <storage>20 TB</storage>
              </resources>
              <capabilities>
                <supported_NFs>
                        <node>
                            <id>NF1</id>
                            <name>vFirewall</name>



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                            <type>Stateful virtual firewall C</type>
                            <ports>
                                <port>
                                    <id>1</id>
                                    <name>in</name>
                                    <port_type>port-abstract</port_type>
                                    <capability>...</capability>
                                </port>
                                <port>
                                    <id>2</id>
                                    <name>out</name>
                                    <port_type>port-abstract</port_type>
                                    <capability>...</capability>
                                </port>
                            </ports>
                            <resources>
                                        <cpu> ? </cpu>
                                        <mem> ? </mem>
                                        <storage> ? </storage>
                                    </resources>
                        <links>
                                        <link>
                                            <id>int0</id>
                                            <name>internal horizontal</name>
                                            <src>../../ports/port[id=1]</src>
                                            <dst>../../ports/port[id=2]</dst>
                                            <resources>
                                                <delay> 20 us </delay>
                                                <bandwidth> 10 GB </bandwidth>
                                            </resources>
                                        </link>
                                </links>
                        </node>
                </supported_NFs>
              </capabilities>
          </node>
      </nodes>
  </virtualizer>


                     Figure 5: VBaaS_Request(NF-FG-1)


  <virtualizer xmlns="http://fp7-unify.eu/framework/virtualizer">
      <id>UUID001</id>
      <name>Single node simple VBaaS report</name>
      <nodes>
          <node>



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              <id>UUID11</id>
              <name>single Bis-Bis node</name>
              <type>BisBis</type>
              <capabilities>
                <supported_NFs>
                        <node>
                            <id>NF1</id>
                            <name>vFirewall</name>
                            <type>Stateful virtual firewall C</type>
                            <ports>
                                <port>
                                    <id>1</id>
                                    <name>in</name>
                                    <port_type>port-abstract</port_type>
                                    <capability>...</capability>
                                </port>
                                <port>
                                    <id>2</id>
                                    <name>out</name>
                                    <port_type>port-abstract</port_type>
                                    <capability>...</capability>
                                </port>
                            </ports>
                            <resources>
                                        <cpu>2</cpu>
                                        <mem>8 GB</mem>
                                        <storage>20 GB</storage>
                                    </resources>
                        <links>
                                        <link>
                                            <id>int0</id>
                                            <name>internal horizontal</name>
                                            <src>../../ports/port[id=1]</src>
                                            <dst>../../ports/port[id=2]</dst>
                                            <resources>
                                                <delay> 20 us </delay>
                                                <bandwidth> 10 GB </bandwidth>
                                            </resources>
                                        </link>
                                </links>
                        </node>
                </supported_NFs>
              </capabilities>
          </node>
      </nodes>
  </virtualizer>





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                     Figure 6: VBaaS_Request(NF-FG-2)

   Following the above example and the terminology of [ETS14t], the
   different tasks of performance verification, benchmarking and
   dimension can be mapped as follows:

   Verification:  Both {cpu, memory, storage} and {delay, bandwidth}
      parameters are provided and the VBaaS system verifies if the given
      association is correct or not.  In the case of a failure the entry
      might be removed or updated with correct values.

   Benchmarking:  Where {cpu, memory, storage} parameters are provided
      and the VBaaS service fills-in the corresponding {delay,
      bandwidth} performance parameters.  Note, such request might
      create more entries, like an entry with minimal delay and an entry
      with maximum bandwidth.

   Dimensioning:  Where {delay, bandwidth} performance parameters are
      provided and the VBaaS service fills-in the corresponding {cpu,
      memory, storage} resource parameters (as shown in the above
      example).

7.  Related drafts and open source projects

   Definetly, VBaaS intersects IETF Benchmarking Methodology Work Group
   (BMWG) goals.  For example, in [Mor15], "Considerations for
   Benchmarking Virtual Network Functions and Their Infrastructure"
   presents relevant statements concerning, for example, % of
   utilization of NFVI PoPs resources; noisy behavior caused by VNFs
   operations and misbehavior in NFVI PoPs; long-term tests which
   represent service continuity guarantees for VNFs; and considerations
   on how shared resources dependencies may affect consistent benchmark
   results.  All these NFV benchmarking aspects are relevant for VBaaS,
   as well other current [Tah15] and future recommendations from BMWG.

   The main DevOps Principles for Software Defined Infrastructures
   (SDIs) (e.g., NFV and SDN), well explained in [Meir15], are
   associated with the main design concepts of VBaaS.  By definition,
   DevOps principles look for deployment with repeatable and reliable
   processes (VNF-BPs), as well modular, e.g., VNF Profiles assisting
   orchestration decisions.  Besides, it also stands for development and
   testing procedures to assist VNF Developers (VBaaS API) specify
   modular applications/components (VNF-BPs) against production-like
   systems.  In addition, DevOps intends to define ways of monitor and
   validate operational quality of services before and after services
   deployment, e.g., respectively applying VNF-BPs in multiple NFVI PoPs
   and over instantiated VNFs.  All these aspects illustrate how VBaaS
   can help in amplifying the cycle between VNFs continuous changes of



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   development and Operators desires for infrastructure stability and
   reliability, therefore, helping the consolidation of DevOps
   principles in SDIs.

   In OPNFV (Open Platform for NFV) community, projects dedicated to VIM
   and NFVI tests are being developed, such as vSwitchPerf, Pharos,
   Functest, among others.  Specifically, Yardstick [Yard15] is closely
   related with VBaaS, because it stands for a common definition of
   tests to verify the infrastructure compliance when running VNF
   applications.  While VBaaS is still building its concepts, Yardstick
   already defined requirements, methodologies (including metrics for
   compute, network and storage domains), besides functional code.  The
   specification of yaml files to define structures like scenarios,
   contexts and runners, as a Yardstick nomenclature to compose tests,
   represents associations with VNF-BPs concepts.  As Yardstick future
   work intends to apply tests in compute and storage domains, and store
   tests results, it is on its way the possible intersection with VBaaS
   concepts, like VNF Profiles.

   T-NOVA [TNOVA15] pursues the definition of a marketplace for VNFs
   (and turn them instanced as a service).  Regarding the description of
   capabilities for the allocation of VNFs, T-NOVA intends to allow
   network services and functions, by a variety of developers, to be
   published and brokered/traded, allowing customers to browse and
   select services that best match their needs (negotiating SLAs and
   billing models).  One of the main marketplace functions is the
   publication of resources and network function advertisements in order
   to compose and package NFV services.  VBaaS can enhance VNFs
   capabilities publication and certification models of their
   performance when constructing a diverse set of VNF-Profiles.
   Consequently, VNF flavors can be defined by an enhanced set of VBaaS
   capabilities for smarter placements, e.g., exposing VBaaS interfaces
   for developers evolve VNF-Profiles.

   Unify [Szab15] presents a recursive compute and network joint
   virtualization and programming view of generic infrastructures (e.g.,
   data centers), considering NFV as an example.  Big Switch with Big
   Software (BiS-BiS) represents the abstraction of such virtualization.
   The draft presents an Yang model to describe a Network Function
   Forwarding Graph (NF-FG) representing NFV resources.  Complementary,
   as part of main Unify goals, problem statements and challenges about
   the unification of carrier and cloud networks [Csas15] show the need
   for a high level of programmability beyond policy and service
   descriptions.  As presented, VBaaS can contribute for such
   abstractions since it detaches from monolithic views of
   infrastructure resources allowing the recursive definitions of VBaaS
   Service Graphs and, consequently, the decomposition of benchmark
   tasks in multiple domains.  Besides, as stated by Unify measurements



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   and analytics challenges, VBaaS poses as a solution of tools for
   planning, testing, and reliability assurance of NFVIs.

8.  IANA Considerations

   This memo includes no request to IANA.

9.  Security Considerations

   TBD

10.  Acknowledgement

   The authors would like to thank the support of Ericsson Research,
   Brazil.

   This work is partially supported by FP7 UNIFY, a research project
   partially funded by the European Community under the Seventh
   Framework Program (grant agreement no. 619609).  The views expressed
   here are those of the authors only.  The European Commission is not
   liable for any use that may be made of the information in this
   document.

11.  Informative References

   [BVLS15]   B. Han, V. Gopalakrishnan, L. Ji, and S. Lee, "Network
              function virtualization: Challenges and opportunities for
              innovations", Communications Magazine, IEEE, vol. 53, no.
              2, pp. 90-97 , February 2015.

   [Csas15]   R. Szabo, A. Csaszar, K. Pentikousis, M. Kind, D. Daino,
              Z. Qiang, H. Woesner, "Unifying Carrier and Cloud
              Networks: Problem Statement and Challenges", March 2015,
              <https://tools.ietf.org/html/draft-unify-nfvrg-challenges-
              01>.

   [ETS14a]   ETSI, "Architectural Framework - ETSI GS NFV 002 V1.2.1",
              Dec 2014, <http://www.etsi.org/deliver/etsi\_gs/
              NFV/001\_099/002/01.02.01-\_60/gs\_NFV002v010201p.pdf>.

   [ETS14b]   ETSI, "Terminology for Main Concepts in NFV - ETSI GS NFV
              003 V1.2.1", Dec 2014,
              <http://www.etsi.org/deliver/etsi_gs/NFV/001_099-
              /003/01.02.01_60/gs_NFV003v010201p.pdf>.







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   [ETS14c]   ETSI, "Management and Orchestration - ETSI GS NFV-MAN 001
              V1.1.1", Dec 2014, <http://www.etsi.org/deliver/etsi_gs/
              NFV-MAN/001_099/001/01.01.01_60/
              gs_NFV-MAN001v010101p.pdf>.

   [ETS14d]   ETSI, "Virtual Network Functions Architecture - ETSI GS
              NFV-SWA 001 V1.1.1", Dec 2014,
              <http://www.etsi.org/deliver/etsi_gs/NFV-
              SWA/001_099/001/01.01.01_60/gs_NFV-SWA001v010101p.pdf>.

   [ETS14t]   ETSI, "NFV Pre-deployment Testing - ETSI GS NFV TST001
              V0.0.13", Sept 2015,
              <http://docbox.etsi.org/ISG/NFV/Open/DRAFTS/TST001_-_Pre-
              deployment_Validation/NFV-TST001v0013.zip>.

   [Meir15]   C. Meirosu, A. Manzalini, J. Kim, R. Steinert, S. Sharma,
              G. Marchetto, I. Papafili, K. Pentikousis, S. Wright,
              "DevOps for Software-Defined Telecom Infrastructures",
              July 2015,
              <http://www.ietf.org/id/draft-unify-nfvrg-devops-02.txt>.

   [Mor15]    A. Morton, "Considerations for Benchmarking Virtual
              Network Functions and Their Infrastructure", February
              2015, <http://tools.ietf.org/html/
              draft-morton-bmwg-virtual-net-03>.

   [PSPL15]   E. Paik and M-K. Shin and S. Pack and S. Lee, "Resource
              Management in Service Chaining", March 2015,
              <http://tools.ietf.org/html/
              draft-lee-nfvrg-resource-management-service-chain-01>.

   [Szab15]   R. Szabo, Z. Qiang, M. Kind, "Towards recursive
              virtualization and programming for network and cloud
              resources", July 2015, <https://tools.ietf.org/html/draft-
              unify-nfvrg-recursive-programming-01>.

   [Tah15]    M. Tahhan, B. O'Mahony, A. Morton, "Benchmarking Virtual
              Switches in OPNFV", July 2015,
              <https://tools.ietf.org/html/draft-vsperf-bmwg-vswitch-
              opnfv-00>.

   [TNOVA15]  T-NOVA, "T-NOVA Results", July 2015,
              <http://www.t-nova.eu/results/>.

   [Yard15]   OPNFV, "Project: Yardstick - Infrastructure Verification",
              July 2015, <https://wiki.opnfv.org/yardstick>.





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Authors' Addresses

   Raphael Vicente Rosa
   University of Campinas
   Irinyi Jozsef u. 4-20
   Budapest  1117
   Hungary

   Email: raphaelvrosa@dca.fee.unicamp.br
   URI:   http://www.intrig.dca.fee.unicamp.br/


   Christian Esteve Rothenberg
   University of Campinas
   Av. Albert Einstein, 400
   Campinas  13083-852
   Brasil

   Email: chesteve@dca.fee.unicamp.br
   URI:   http://www.dca.fee.unicamp.br/~chesteve/


   Robert Szabo
   Ericsson Research, Hungary
   Irinyi Jozsef u. 4-20
   Budapest  1117
   Hungary

   Email: robert.szabo@ericsson.com
   URI:   http://www.ericsson.com/





















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