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From: Zongning <zongning@huawei.com>
To: "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Date: Tue, 3 Jun 2014 09:35:51 +0000
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Subject: [vnfpool] new VNFPool draft charter
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Hi, folks,

Please see the below new draft charter of VNFPool. We believe that we have =
updated the charter to address most of the comments from London BoF. Main c=
hanges are:

1)       We narrow down our scope to only focus on the redundancy model and=
 the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is out-of-scop=
e. We may consider how to maintain the pool states in a VNF Pool only for p=
ooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of same=
 functional type. Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.

4)       We do not address reliability related control or routing between a=
djacent VNFs in the service graph. This is also applied to update the relat=
ion between VNF Pool and SFC WG.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to provide a reliable function, a VNF may adopt a pooling mechanis=
m by using a number of VNF instances providing the same function, which we =
call a "VNF Pool". Conceptionally, a Pool Manager is used to manage the VNF=
 Pool, e.g., selects active/standby VNF instances, and potentially interact=
s with a service control entity. Such a service control entity is an entity=
 that orchestrates a set of network functions to build network services. Th=
e major benefit of using VNF Pool is that reliability mechanisms such as re=
dundancy model are achieved by the VNF Pool inside the VNF and thus not vis=
ible to the service control entity. A VNF Pool-enabled VNF still appears as=
 a normal VNF when orchestrated by a service control entity.

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

*           How to manage the redundancy model, e.g., select active/standby=
 VNF instances in a VNF Pool?

*           What pool states need to be maintained to support the pooling m=
echanism itself, and how are such states maintained?

*           What information is exchanged between a VNF and a service contr=
ol entity? For example, how can a VNF Pool be addressed by the service cont=
rol entity?

*           When a live VNF instance goes out of service, how does the serv=
ice control entity learn which instance in a VNF Pool will replace it, and =
learn the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms that may be needed include state maintenance in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains redundant VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.
Specifically, the WG will work on the following technical aspects:

*           Redundancy management within a VNF Pool, such as the signaling =
between the Pool Manager and the instances in the pool for instance registr=
ation, backup instances selection, and switching between active and standby=
 instances.

*           The protocol between the Pool Manager and the underlying networ=
k to collect the network information required for appropriate placement/sel=
ection of backup instances.

*           The protocol between a VNF and the service control entity to ex=
change operational information between a VNF Pool and the service control e=
ntity.

*           Identify and analyze reliable transport protocols, such as MPTC=
P and SCTP for reliable delivery of the messages associated with the redund=
ancy management within a VNF Pool.

*           Analysis of pooling security characteristics and requirements t=
o identify and mitigate threats against the pooling mechanism. Identificati=
on of an appropriate trust model between pool members, and between pool mem=
bers and Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, VNF Pool r=
equirements and an architecture covering the aforementioned technical aspec=
ts, and applicability and gap analysis of existing technologies such as RSe=
rPool. It is our expectation that we will be able to rely heavily on existi=
ng IETF technologies, but that gaps will be found around problems like redu=
ndancy mechanisms, state maintenance solely for pooling purposes, reliable =
transport, and trust/security, all of which will need to be considered and =
addressed. The WG will include consideration of the manageability of a VNF =
Pool. The WG will seek re-chartering before adopting any work to develop ne=
w, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Information e=
xchanged between the VNF Pool and the SFC may include some operational info=
rmation from the VNF Pool including the pool address, pool instance charact=
eristic, and so on, as requested by the SFC WG.

Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 Informational
April 2015 - Submit VNFPool Use Cases to IESG for publication as Informatio=
nal
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as Informational
August 2015 - Submit VNFPool Architecture to IESG for publication as Propos=
ed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter text are highly appreciated!

Thanks.

-Ning

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We narrow down our scop=
e to only focus on the redundancy model and the related interfaces associat=
ed with the VNF Pool in a single VNF.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Service state synchroni=
zation between VNF instances is out-of-scope. We may consider how to mainta=
in the pool states in a VNF Pool only for pooling purpose.<o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We assume that a VNF Po=
ol contains redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We do not address relia=
bility related control or routing between adjacent VNFs in the service grap=
h. This is also applied to update the relation between VNF Pool and SFC WG.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a &#8220;VNF Pool&#8221;.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">When a live VNF instanc=
e goes out of service, how does the service control entity learn which inst=
ance in a VNF Pool will replace it, and learn the characteristics of the ne=
w instance?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains redundant VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Redundancy management w=
ithin a VNF Pool, such as the signaling between the Pool Manager and the in=
stances in the pool for instance registration, backup instances selection, =
and switching between active and standby
 instances.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between th=
e Pool Manager and the underlying network to collect the network informatio=
n required for appropriate placement/selection of backup instances.<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between a =
VNF and the service control entity to exchange operational information betw=
een a VNF Pool</span><span lang=3D"DE"> and the service control entity.</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Identify and analyze re=
liable transport protocols, such as MPTCP and SCTP for reliable delivery of=
 the messages associated with the redundancy management within a VNF Pool.<=
o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Analysis of pooling sec=
urity characteristics and requirements to identify and mitigate threats aga=
inst the pooling mechanism. Identification of an appropriate trust model be=
tween pool members, and between pool
 members and Pool Manager.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"color:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Information exchanged between the =
VNF Pool and the SFC may include some
 operational information from the VNF Pool including the pool address, pool=
 instance characteristic, and so on, as requested by the SFC WG.<o:p></o:p>=
</span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning<o:p></o:p></span></p>
</div>
</body>
</html>

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Hi,

It looks really good to me, Ning!

I am just wondering whether we could give state synchronization a special c=
ategory (of being "out of scope in this phase" or similar) because I think =
it is a extremely relevant issue.

Be goode,

On 3 Jun 2014, at 11:35 , Zongning <zongning@huawei.com<mailto:zongning@hua=
wei.com>> wrote:

Hi, folks,

Please see the below new draft charter of VNFPool. We believe that we have =
updated the charter to address most of the comments from London BoF. Main c=
hanges are:
1)       We narrow down our scope to only focus on the redundancy model and=
 the related interfaces associated with the VNF Pool in a single VNF.
2)       Service state synchronization between VNF instances is out-of-scop=
e. We may consider how to maintain the pool states in a VNF Pool only for p=
ooling purpose.
3)       We assume that a VNF Pool contains redundant VNF instances of same=
 functional type. Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.
4)       We do not address reliability related control or routing between a=
djacent VNFs in the service graph. This is also applied to update the relat=
ion between VNF Pool and SFC WG.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to provide a reliable function, a VNF may adopt a pooling mechanis=
m by using a number of VNF instances providing the same function, which we =
call a =93VNF Pool=94. Conceptionally, a Pool Manager is used to manage the=
 VNF Pool, e.g., selects active/standby VNF instances, and potentially inte=
racts with a service control entity. Such a service control entity is an en=
tity that orchestrates a set of network functions to build network services=
. The major benefit of using VNF Pool is that reliability mechanisms such a=
s redundancy model are achieved by the VNF Pool inside the VNF and thus not=
 visible to the service control entity. A VNF Pool-enabled VNF still appear=
s as a normal VNF when orchestrated by a service control entity.

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:
=95           How to manage the redundancy model, e.g., select active/stand=
by VNF instances in a VNF Pool?
=95           What pool states need to be maintained to support the pooling=
 mechanism itself, and how are such states maintained?
=95           What information is exchanged between a VNF and a service con=
trol entity? For example, how can a VNF Pool be addressed by the service co=
ntrol entity?
=95           When a live VNF instance goes out of service, how does the se=
rvice control entity learn which instance in a VNF Pool will replace it, an=
d learn the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms that may be needed include state maintenance in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains redundant VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.
Specifically, the WG will work on the following technical aspects:
=95           Redundancy management within a VNF Pool, such as the signalin=
g between the Pool Manager and the instances in the pool for instance regis=
tration, backup instances selection, and switching between active and stand=
by instances.
=95           The protocol between the Pool Manager and the underlying netw=
ork to collect the network information required for appropriate placement/s=
election of backup instances.
=95           The protocol between a VNF and the service control entity to =
exchange operational information between a VNF Pool and the service control=
 entity.
=95           Identify and analyze reliable transport protocols, such as MP=
TCP and SCTP for reliable delivery of the messages associated with the redu=
ndancy management within a VNF Pool.
=95           Analysis of pooling security characteristics and requirements=
 to identify and mitigate threats against the pooling mechanism. Identifica=
tion of an appropriate trust model between pool members, and between pool m=
embers and Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, VNF Pool r=
equirements and an architecture covering the aforementioned technical aspec=
ts, and applicability and gap analysis of existing technologies such as RSe=
rPool. It is our expectation that we will be able to rely heavily on existi=
ng IETF technologies, but that gaps will be found around problems like redu=
ndancy mechanisms, state maintenance solely for pooling purposes, reliable =
transport, and trust/security, all of which will need to be considered and =
addressed. The WG will include consideration of the manageability of a VNF =
Pool. The WG will seek re-chartering before adopting any work to develop ne=
w, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Information e=
xchanged between the VNF Pool and the SFC may include some operational info=
rmation from the VNF Pool including the pool address, pool instance charact=
eristic, and so on, as requested by the SFC WG.

Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 Informational
April 2015 - Submit VNFPool Use Cases to IESG for publication as Informatio=
nal
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as Informational
August 2015 - Submit VNFPool Architecture to IESG for publication as Propos=
ed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter text are highly appreciated!

Thanks.

-Ning
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http://people.tid.es/diego.lopez/

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Hi,
<div><br>
</div>
<div>It looks really good to me, Ning!</div>
<div><br>
</div>
<div>I am just wondering whether we could give state synchronization a spec=
ial category (of being &quot;out of scope in this phase&quot; or similar) b=
ecause I think it is a extremely relevant issue.</div>
<div><br>
</div>
<div>Be goode,</div>
<div><br>
<div>
<div>On 3 Jun 2014, at 11:35 , Zongning &lt;<a href=3D"mailto:zongning@huaw=
ei.com">zongning@huawei.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div lang=3D"ZH-CN" style=3D"font-family:LucidaGrande; font-size:11px; font=
-style:normal; font-variant:normal; font-weight:normal; letter-spacing:norm=
al; line-height:normal; orphans:auto; text-align:start; text-indent:0px; te=
xt-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<div class=3D"WordSection1" style=3D"">
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Hi, folks,</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Please see the below new draft charter of VNFPool. We =
believe that we have updated the charter to address most of the comments fr=
om London BoF. Main changes are:</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 18pt; text-align:justify; text-indent=
:-18pt; font-size:10.5pt; font-family:Calibri,sans-serif">
<span lang=3D"EN-US"><span>1)<span style=3D"font-style:normal; font-variant=
:normal; font-weight:normal; font-size:7pt; line-height:normal; font-family=
:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Appl=
e-converted-space">&nbsp;</span></span></span></span><span lang=3D"EN-US">W=
e
 narrow down our scope to only focus on the redundancy model and the relate=
d interfaces associated with the VNF Pool in a single VNF.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 18pt; text-align:justify; text-indent=
:-18pt; font-size:10.5pt; font-family:Calibri,sans-serif">
<span lang=3D"EN-US"><span>2)<span style=3D"font-style:normal; font-variant=
:normal; font-weight:normal; font-size:7pt; line-height:normal; font-family=
:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Appl=
e-converted-space">&nbsp;</span></span></span></span><span lang=3D"EN-US">S=
ervice
 state synchronization between VNF instances is out-of-scope. We may consid=
er how to maintain the pool states in a VNF Pool only for pooling purpose.<=
/span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 18pt; text-align:justify; text-indent=
:-18pt; font-size:10.5pt; font-family:Calibri,sans-serif">
<span lang=3D"EN-US"><span>3)<span style=3D"font-style:normal; font-variant=
:normal; font-weight:normal; font-size:7pt; line-height:normal; font-family=
:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Appl=
e-converted-space">&nbsp;</span></span></span></span><span lang=3D"EN-US">W=
e
 assume that a VNF Pool contains redundant VNF instances of same functional=
 type.<span class=3D"Apple-converted-space">&nbsp;</span></span><span lang=
=3D"DE">Different types of VNFs are envisoned to be held in separate VNF Po=
ols.</span><span lang=3D"EN-US"></span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 18pt; text-align:justify; text-indent=
:-18pt; font-size:10.5pt; font-family:Calibri,sans-serif">
<span lang=3D"EN-US"><span>4)<span style=3D"font-style:normal; font-variant=
:normal; font-weight:normal; font-size:7pt; line-height:normal; font-family=
:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Appl=
e-converted-space">&nbsp;</span></span></span></span><span lang=3D"EN-US">W=
e
 do not address reliability related control or routing between adjacent VNF=
s in the service graph. This is also applied to update the relation between=
 VNF Pool and SFC WG.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Network functions such as firewalls, load balancers, a=
nd WAN optimizers are conventionally deployed as specialized hardware serve=
rs in both network operators' networks and data center networks as the buil=
ding blocks of the network services.
 There is a trend to implement such network functions as software instances=
 running on general purpose servers, via a virtualization layer (i.e., hype=
rvisors). These virtualized functions are called Virtualized Network Functi=
ons (VNFs), which can be used to
 build network services.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">The use of VNFs introduces additional challenges to th=
e reliability of the provided network services. A single VNF instance would=
 typically not have built-in reliability mechanisms on its host (i.e., a ge=
neral purpose server). Instead, there
 are more factors of risk such as software failure at various levels includ=
ing hypervisors and virtual machines, hardware failure, and instance migrat=
ion that can make a VNF instance unreliable.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">In order to provide<span class=3D"Apple-converted-spac=
e">&nbsp;</span></span><span lang=3D"DE">a<span class=3D"Apple-converted-sp=
ace">&nbsp;</span></span><span lang=3D"EN-US">reliable function, a VNF may =
adopt a pooling mechanism by using a number of VNF instances
 providing the same function, which we call a =93VNF Pool=94.<span class=3D=
"Apple-converted-space">&nbsp;</span></span><span lang=3D"DE">Conceptionall=
y, a<span class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D=
"EN-US">Pool Manager is used to manage the VNF Pool, e.g.,
 selects active/standby VNF instances, and potentially interacts with a ser=
vice control entity.<span class=3D"Apple-converted-space">&nbsp;</span></sp=
an><span lang=3D"DE">Such a<span class=3D"Apple-converted-space">&nbsp;</sp=
an></span><span lang=3D"EN-US">service control entity
 is an entity that orchestrates a set of network functions to build network=
 services. The major benefit of using VNF Pool is that reliability mechanis=
ms such as redundancy model are achieved by the VNF Pool inside the VNF and=
 thus not visible to the service
 control entity. A VNF Pool-enabled VNF still appears as a normal VNF when =
orchestrated by<span class=3D"Apple-converted-space">&nbsp;</span></span><s=
pan lang=3D"DE">a<span class=3D"Apple-converted-space">&nbsp;</span></span>=
<span lang=3D"EN-US">service control entity.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Questions that are raised by the addition of a pooling=
 mechanism to VNF include:</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 24.6pt; text-align:justify; text-inde=
nt:-3.6pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">How
 to manage the redundancy model, e.g., select active/standby VNF instances =
in a VNF Pool?</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 24.6pt; text-align:justify; text-inde=
nt:-3.6pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">What
 pool states need to be maintained to support the pooling mechanism itself,=
 and how are such states maintained?</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 24.6pt; text-align:justify; text-inde=
nt:-3.6pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">What
 information is exchanged between a VNF and a service control entity? For e=
xample, how can a VNF Pool be addressed by the service control entity?</spa=
n></div>
<div style=3D"margin:0cm 0cm 0.0001pt 24.6pt; text-align:justify; text-inde=
nt:-3.6pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">When
 a live VNF instance goes out of service, how does the service control enti=
ty learn which instance in a VNF Pool will replace it, and learn the charac=
teristics of the new instance?</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">The WG initially focuses on several reliability mechan=
isms that are mainly associated with a redundancy model based on a VNF Pool=
 in a VNF. Additional mechanisms that may be needed include state maintenan=
ce in a VNF Pool</span><span lang=3D"DE"><span class=3D"Apple-converted-spa=
ce">&nbsp;</span>only
 for pooling purpose (service state synchronization is out of scope). The W=
G</span><span lang=3D"EN-US"><span class=3D"Apple-converted-space">&nbsp;</=
span>assume</span><span lang=3D"DE">s</span><span lang=3D"EN-US"><span clas=
s=3D"Apple-converted-space">&nbsp;</span>that a VNF
 Pool contains redundant VNF instances of same functional type.<span class=
=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"DE">Different =
types of VNFs are envisoned to be held in separate VNF Pools.<span class=3D=
"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US">The
 WG will address the reliability of an individual VNF</span><span lang=3D"D=
E">, but not the</span><span lang=3D"EN-US"><span class=3D"Apple-converted-=
space">&nbsp;</span>reliability related to the control or the routing betwe=
en adjacent VNFs<span class=3D"Apple-converted-space">&nbsp;</span></span><=
span lang=3D"DE">that
 can form a network service</span><span lang=3D"EN-US">.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Specifically, the WG will work on the following techni=
cal aspects:</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 38.85pt; text-align:justify; text-ind=
ent:-21pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">Redundancy
 management within a VNF Pool, such as the signaling between the Pool Manag=
er and the instances in the pool for instance registration, backup instance=
s selection, and switching between active and standby instances.</span></di=
v>
<div style=3D"margin:0cm 0cm 0.0001pt 38.85pt; text-align:justify; text-ind=
ent:-21pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">The
 protocol between the Pool Manager and the underlying network to collect th=
e network information required for appropriate placement/selection of backu=
p instances.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 38.85pt; text-align:justify; text-ind=
ent:-21pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">The
 protocol between a VNF and the service control entity to exchange operatio=
nal information between a VNF Pool</span><span lang=3D"DE"><span class=3D"A=
pple-converted-space">&nbsp;</span>and the service control entity.</span><s=
pan lang=3D"EN-US"></span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 38.85pt; text-align:justify; text-ind=
ent:-21pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">Identify
 and analyze reliable transport protocols, such as MPTCP and SCTP for relia=
ble delivery of the messages associated with the redundancy management with=
in a VNF Pool.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt 38.85pt; text-align:justify; text-ind=
ent:-21pt; font-size:10.5pt; font-family:Calibri,sans-serif; line-height:21=
px">
<span lang=3D"EN-US" style=3D"font-family:Symbol"><span>=B7<span style=3D"f=
ont-style:normal; font-variant:normal; font-weight:normal; font-size:7pt; l=
ine-height:normal; font-family:'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"Apple-converted-space">&n=
bsp;</span></span></span></span><span lang=3D"EN-US">Analysis
 of pooling security characteristics and requirements to identify and mitig=
ate threats against the pooling mechanism. Identification of an appropriate=
 trust model between pool members, and between pool members and Pool Manage=
r.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">The WG plans to deliver a problem statement, a set of =
use cases, VNF Pool requirements and an architecture covering the aforement=
ioned technical aspects, and applicability and gap analysis of existing tec=
hnologies such as RSerPool. It is
 our expectation that we will be able to rely heavily on existing IETF tech=
nologies, but that gaps will be found around problems like redundancy mecha=
nisms, state maintenance</span><span lang=3D"DE"><span class=3D"Apple-conve=
rted-space">&nbsp;</span>solely for pooling
 purposes</span><span lang=3D"EN-US">, reliable transport, and trust/securi=
ty, all of which will need to be considered and addressed. The WG will incl=
ude consideration of the manageability of a VNF Pool. The WG will seek re-c=
hartering before adopting any work
 to develop new, or extend existing, protocols.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">In particular, we will work closely with the SFC WG, a=
s we believe that SFC and VNF Pool are independent but complementary.<span =
class=3D"Apple-converted-space">&nbsp;</span><span style=3D"">SFC would ess=
entially see a VNF Pool-enabled VNF as a normal
 service function and therefore be able to merge it into an SFC just like a=
ny other service functions. Information exchanged between the VNF Pool and =
the SFC may include some operational information from the VNF Pool includin=
g the pool address, pool instance
 characteristic, and so on, as requested by the SFC WG.</span></span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Goals and Milestones:</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">December 2014 - Submit VNFPool Problem Statement to IE=
SG for publication as Informational</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">April 2015 - Submit VNFPool Use Cases to IESG for publ=
ication as Informational</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">August 2015 - Submit VNFPool Requirements, including t=
he manageability of VNF Pool to IESG for publication as Informational</span=
></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">August 2015 - Submit VNFPool Architecture to IESG for =
publication as Proposed Standard</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">December 2015 - Submit Applicability and Gap Analysis =
of RSerPool to IESG for publication as Informational</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Your comments and suggestions to the charter text are =
highly appreciated!</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">Thanks.</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">&nbsp;</span></div>
<div style=3D"margin:0cm 0cm 0.0001pt; text-align:justify; font-size:10.5pt=
; font-family:Calibri,sans-serif">
<span lang=3D"EN-US">-Ning</span></div>
</div>
_______________________________________________<br>
vnfpool mailing list<br>
<a href=3D"mailto:vnfpool@ietf.org" style=3D"color:purple; text-decoration:=
underline">vnfpool@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/vnfpool" style=3D"color:pu=
rple; text-decoration:underline">https://www.ietf.org/mailman/listinfo/vnfp=
ool</a></div>
</blockquote>
</div>
<br>
<div><span class=3D"Apple-style-span" style=3D"border-collapse:separate; co=
lor:rgb(0,0,0); font-family:Helvetica; font-style:normal; font-variant:norm=
al; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:=
2; text-indent:0px; text-transform:none; white-space:normal; widows:2; word=
-spacing:0px"><span class=3D"Apple-style-span" style=3D"border-collapse:sep=
arate; color:rgb(0,0,0); font-family:Helvetica; font-style:normal; font-var=
iant:normal; font-weight:normal; letter-spacing:normal; line-height:normal;=
 orphans:2; text-indent:0px; text-transform:none; white-space:normal; widow=
s:2; word-spacing:0px">
<div style=3D"word-wrap:break-word"><span class=3D"Apple-style-span" style=
=3D"border-collapse:separate; color:rgb(0,0,0); font-family:Helvetica; font=
-style:normal; font-variant:normal; font-weight:normal; letter-spacing:norm=
al; line-height:normal; orphans:2; text-indent:0px; text-transform:none; wh=
ite-space:normal; widows:2; word-spacing:0px">
<div style=3D"word-wrap:break-word"><br>
--<br>
&quot;Esta vez no fallaremos, Doctor Infierno&quot;<br>
<br>
Dr Diego R. Lopez<br>
Telefonica I&#43;D</div>
<div style=3D"word-wrap:break-word"><a href=3D"http://people.tid.es/diego.l=
opez/">http://people.tid.es/diego.lopez/</a><br>
<br>
e-mail: diego@tid.es<br>
Tel: &nbsp; &nbsp;&#43;34 913 129 041<br>
Mobile: &#43;34 682 051 091<br>
-----------------------------------------</div>
</span></div>
</span></span></div>
<br>
</div>
<br>
<hr>
<font face=3D"Arial" color=3D"Gray" size=3D"1"><br>
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From nobody Tue Jun  3 15:36:06 2014
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Subject: Re: [vnfpool] new VNFPool draft charter
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On 6/3/14 2:23 PM, Diego R. Lopez wrote:
> Hi,
> 
> It looks really good to me, Ning!
> 
> I am just wondering whether we could give state synchronization a 
> special category (of being "out of scope in this phase" or similar) 
> because I think it is a extremely relevant issue.

This is an extremely contested question.  It seems appropriate to me
to view vnfpool as a layered mechanism, where a layer handling the
reliability/redundancy mechanism may carry other traffic, but that
traffic is opaque to the pooling mechanism.  That traffic might
include service state.  But, this is my second go-'round on state
transfer (third, if you include sami, the first one being rserpool
itself) and I really think it's best to be left out of scope with
no specific future plans for the time being, but to allow a generic
transport mechanism in the pooling traffic.

Melinda


-- 
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."


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Hi Ning,



The charter looks good to me!



In order to solve the state synchronisation issue, you may want to modify t=
he sentence from:



Additional mechanisms that may be needed include state maintenance in a VNF=
 Pool only for pooling purpose (service state synchronization is out of sco=
pe).



INTO:



Service state synchronization is out of scope. However, state maintenance m=
echanisms required in a VNF pool for pooling purposes are also in scope.



Diego, Melinda, does the above change address your concerns.



Best regards,

Georgios


________________________________
Van: vnfpool [vnfpool-bounces@ietf.org] namens Zongning [zongning@huawei.co=
m]
Verzonden: dinsdag 3 juni 2014 11:35
Aan: vnfpool@ietf.org
Onderwerp: [vnfpool] new VNFPool draft charter

Hi, folks,

Please see the below new draft charter of VNFPool. We believe that we have =
updated the charter to address most of the comments from London BoF. Main c=
hanges are:

1)       We narrow down our scope to only focus on the redundancy model and=
 the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is out-of-scop=
e. We may consider how to maintain the pool states in a VNF Pool only for p=
ooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of same=
 functional type. Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.

4)       We do not address reliability related control or routing between a=
djacent VNFs in the service graph. This is also applied to update the relat=
ion between VNF Pool and SFC WG.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to provide a reliable function, a VNF may adopt a pooling mechanis=
m by using a number of VNF instances providing the same function, which we =
call a =93VNF Pool=94. Conceptionally, a Pool Manager is used to manage the=
 VNF Pool, e.g., selects active/standby VNF instances, and potentially inte=
racts with a service control entity. Such a service control entity is an en=
tity that orchestrates a set of network functions to build network services=
. The major benefit of using VNF Pool is that reliability mechanisms such a=
s redundancy model are achieved by the VNF Pool inside the VNF and thus not=
 visible to the service control entity. A VNF Pool-enabled VNF still appear=
s as a normal VNF when orchestrated by a service control entity.

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

=95           How to manage the redundancy model, e.g., select active/stand=
by VNF instances in a VNF Pool?

=95           What pool states need to be maintained to support the pooling=
 mechanism itself, and how are such states maintained?

=95           What information is exchanged between a VNF and a service con=
trol entity? For example, how can a VNF Pool be addressed by the service co=
ntrol entity?

=95           When a live VNF instance goes out of service, how does the se=
rvice control entity learn which instance in a VNF Pool will replace it, an=
d learn the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms that may be needed include state maintenance in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains redundant VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.
Specifically, the WG will work on the following technical aspects:

=95           Redundancy management within a VNF Pool, such as the signalin=
g between the Pool Manager and the instances in the pool for instance regis=
tration, backup instances selection, and switching between active and stand=
by instances.

=95           The protocol between the Pool Manager and the underlying netw=
ork to collect the network information required for appropriate placement/s=
election of backup instances.

=95           The protocol between a VNF and the service control entity to =
exchange operational information between a VNF Pool and the service control=
 entity.

=95           Identify and analyze reliable transport protocols, such as MP=
TCP and SCTP for reliable delivery of the messages associated with the redu=
ndancy management within a VNF Pool.

=95           Analysis of pooling security characteristics and requirements=
 to identify and mitigate threats against the pooling mechanism. Identifica=
tion of an appropriate trust model between pool members, and between pool m=
embers and Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, VNF Pool r=
equirements and an architecture covering the aforementioned technical aspec=
ts, and applicability and gap analysis of existing technologies such as RSe=
rPool. It is our expectation that we will be able to rely heavily on existi=
ng IETF technologies, but that gaps will be found around problems like redu=
ndancy mechanisms, state maintenance solely for pooling purposes, reliable =
transport, and trust/security, all of which will need to be considered and =
addressed. The WG will include consideration of the manageability of a VNF =
Pool. The WG will seek re-chartering before adopting any work to develop ne=
w, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Information e=
xchanged between the VNF Pool and the SFC may include some operational info=
rmation from the VNF Pool including the pool address, pool instance charact=
eristic, and so on, as requested by the SFC WG.

Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 Informational
April 2015 - Submit VNFPool Use Cases to IESG for publication as Informatio=
nal
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as Informational
August 2015 - Submit VNFPool Architecture to IESG for publication as Propos=
ed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter text are highly appreciated!

Thanks.

-Ning

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<body lang=3D"ZH-CN" vlink=3D"purple" link=3D"blue" fPStyle=3D"1" ocsi=3D"0=
">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;"><span lang=3D"DE">
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Hi Ning,
<?xml:namespace prefix =3D o ns =3D "urn:schemas-microsoft-com:office:offic=
e" />
 <o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p>&nbsp;</o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">The charter looks good to me!</span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p></o:p></span>&nbsp;</p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">In order to solve the state synchronisation issue, you may want to mod=
ify the sentence from:<o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p>&nbsp;</o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Additional mechanisms that may be needed include state maintenance in =
a VNF Pool only for pooling purpose
 (service state synchronization is out of scope). <o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"></span>&nbsp;</p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">INTO:<o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p>&nbsp;</o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Service state synchronization is out of scope. However, state maintena=
nce mechanisms required in a VNF pool
 for pooling purposes are also in scope.<o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p>&nbsp;</o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Diego, Melinda, does the above change address your concerns.<o:p></o:p=
></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB"><o:p>&nbsp;</o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Best regards,<o:p></o:p></span></p>
<p><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SI=
ZE: 10pt; mso-ansi-language: EN-GB; mso-fareast-language: ZH-CN" lang=3D"EN=
-GB">Georgios<o:p></o:p></span></p>
<p style=3D"TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal" alig=
n=3D"left"><span style=3D"mso-ansi-language: EN-GB" lang=3D"EN-GB"><o:p><fo=
nt size=3D"2" face=3D"Times New Roman">&nbsp;</font></o:p></span></p>
<p></p>
<p><span lang=3D"DE"></span></p>
<p></p>
</span>
<div style=3D"FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 16px=
">
<hr tabindex=3D"-1">
<div style=3D"DIRECTION: ltr" id=3D"divRpF810814"><font color=3D"#000000" s=
ize=3D"2" face=3D"Tahoma"><b>Van:</b> vnfpool [vnfpool-bounces@ietf.org] na=
mens Zongning [zongning@huawei.com]<br>
<b>Verzonden:</b> dinsdag 3 juni 2014 11:35<br>
<b>Aan:</b> vnfpool@ietf.org<br>
<b>Onderwerp:</b> [vnfpool] new VNFPool draft charter<br>
</font><br>
</div>
<div></div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:</span></p>
<p style=3D"TEXT-INDENT: -18pt; MARGIN-LEFT: 18pt" class=3D"MsoListParagrap=
h"><span lang=3D"EN-US"><span>1)<span style=3D"FONT: 7pt 'Times New Roman'"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We narrow down our scope to only =
focus on the redundancy model and the related interfaces associated with th=
e VNF Pool in a single VNF.</span></p>
<p style=3D"TEXT-INDENT: -18pt; MARGIN-LEFT: 18pt" class=3D"MsoListParagrap=
h"><span lang=3D"EN-US"><span>2)<span style=3D"FONT: 7pt 'Times New Roman'"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Service state synchronization bet=
ween VNF instances is out-of-scope. We may consider how to maintain the poo=
l states in a VNF Pool only for pooling purpose.</span></p>
<p style=3D"TEXT-INDENT: -18pt; MARGIN-LEFT: 18pt" class=3D"MsoListParagrap=
h"><span lang=3D"EN-US"><span>3)<span style=3D"FONT: 7pt 'Times New Roman'"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We assume that a VNF Pool contain=
s redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"></span></p>
<p style=3D"TEXT-INDENT: -18pt; MARGIN-LEFT: 18pt" class=3D"MsoListParagrap=
h"><span lang=3D"EN-US"><span>4)<span style=3D"FONT: 7pt 'Times New Roman'"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We do not address reliability rel=
ated control or routing between adjacent VNFs in the service graph. This is=
 also applied to update the relation between VNF Pool and SFC WG.</span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.</span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a =93VNF Pool=94.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -3.6pt; MARGIN-LEFT: 24.6pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">How to manage the redundancy mode=
l, e.g., select active/standby VNF instances in a VNF Pool?</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -3.6pt; MARGIN-LEFT: 24.6pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">What pool states need to be maint=
ained to support the pooling mechanism itself, and how are such states main=
tained?</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -3.6pt; MARGIN-LEFT: 24.6pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">What information is exchanged bet=
ween a VNF and a service control entity? For example, how can a VNF Pool be=
 addressed by the service control entity?</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -3.6pt; MARGIN-LEFT: 24.6pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">When a live VNF instance goes out=
 of service, how does the service control entity learn which instance in a =
VNF Pool will replace it, and learn the characteristics of the new instance=
?</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains redundant VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -21pt; MARGIN-LEFT: 38.85pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Redundancy management within a VN=
F Pool, such as the signaling between the Pool Manager and the instances in=
 the pool for instance registration, backup instances selection, and switch=
ing between active and standby instances.</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -21pt; MARGIN-LEFT: 38.85pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">The protocol between the Pool Man=
ager and the underlying network to collect the network information required=
 for appropriate placement/selection of backup instances.</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -21pt; MARGIN-LEFT: 38.85pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">The protocol between a VNF and th=
e service control entity to exchange operational information between a VNF =
Pool</span><span lang=3D"DE"> and the service control entity.</span><span l=
ang=3D"EN-US"></span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -21pt; MARGIN-LEFT: 38.85pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Identify and analyze reliable tra=
nsport protocols, such as MPTCP and SCTP for reliable delivery of the messa=
ges associated with the redundancy management within a VNF Pool.</span></p>
<p style=3D"LINE-HEIGHT: 150%; TEXT-INDENT: -21pt; MARGIN-LEFT: 38.85pt" cl=
ass=3D"MsoListParagraph">
<span style=3D"FONT-FAMILY: Symbol" lang=3D"EN-US"><span>=B7<span style=3D"=
FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Analysis of pooling security char=
acteristics and requirements to identify and mitigate threats against the p=
ooling mechanism. Identification of an appropriate trust model between pool=
 members, and between pool members
 and Pool Manager.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"COLOR: black">SFC would essentially see a VNF Pool-enabled V=
NF as a normal service function and therefore be able to merge it into an S=
FC just like any other service functions. Information exchanged between the=
 VNF Pool and the SFC may include
 some operational information from the VNF Pool including the pool address,=
 pool instance characteristic, and so on, as requested by the SFC WG.</span=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:</span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning</span></p>
</div>
</div>
</div>
</div>
</body>
</html>

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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 4 Jun 2014 15:32:26 -0400
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Cc: vnfpool@ietf.org, Melinda Shore <melinda.shore@gmail.com>, "Diego R. Lopez" <diego@tid.es>, zongning@huawei.com
Subject: Re: [vnfpool] new VNFPool draft charter
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Georgios,

I support the proposed charter in general, and this proposed change in
particular. This is important work and is a very necessary part of a VNF
implementation. Working on it in the IETF allows us to take advantage of
related experience and expertise and have output that's useful to the work
in the SFC WG.

Cheers,
Andy


On Wed, Jun 4, 2014 at 2:26 PM, <karagian@cs.utwente.nl> wrote:

>  Hi Ning,
>
>
>
> The charter looks good to me!
>
>
>
> In order to solve the state synchronisation issue, you may want to modify
> the sentence from:
>
>
>
> Additional mechanisms that may be needed include state maintenance in a
> VNF Pool only for pooling purpose (service state synchronization is out o=
f
> scope).
>
>
>
> INTO:
>
>
>
> Service state synchronization is out of scope. However, state maintenance
> mechanisms required in a VNF pool for pooling purposes are also in scope.
>
>
>
> Diego, Melinda, does the above change address your concerns.
>
>
>
> Best regards,
>
> Georgios
>
>
>
>   ------------------------------
> *Van:* vnfpool [vnfpool-bounces@ietf.org] namens Zongning [
> zongning@huawei.com]
> *Verzonden:* dinsdag 3 juni 2014 11:35
> *Aan:* vnfpool@ietf.org
> *Onderwerp:* [vnfpool] new VNFPool draft charter
>
>   Hi, folks,
>
>
>
> Please see the below new draft charter of VNFPool. We believe that we hav=
e
> updated the charter to address most of the comments from London BoF. Main
> changes are:
>
> 1)       We narrow down our scope to only focus on the redundancy model
> and the related interfaces associated with the VNF Pool in a single VNF.
>
> 2)       Service state synchronization between VNF instances is
> out-of-scope. We may consider how to maintain the pool states in a VNF Po=
ol
> only for pooling purpose.
>
> 3)       We assume that a VNF Pool contains redundant VNF instances of
> same functional type. Different types of VNFs are envisoned to be held in
> separate VNF Pools.
>
> 4)       We do not address reliability related control or routing between
> adjacent VNFs in the service graph. This is also applied to update the
> relation between VNF Pool and SFC WG.
>
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> Network functions such as firewalls, load balancers, and WAN optimizers
> are conventionally deployed as specialized hardware servers in both netwo=
rk
> operators' networks and data center networks as the building blocks of th=
e
> network services. There is a trend to implement such network functions as
> software instances running on general purpose servers, via a virtualizati=
on
> layer (i.e., hypervisors). These virtualized functions are called
> Virtualized Network Functions (VNFs), which can be used to build network
> services.
>
>
>
> The use of VNFs introduces additional challenges to the reliability of th=
e
> provided network services. A single VNF instance would typically not have
> built-in reliability mechanisms on its host (i.e., a general purpose
> server). Instead, there are more factors of risk such as software failure
> at various levels including hypervisors and virtual machines, hardware
> failure, and instance migration that can make a VNF instance unreliable.
>
>
>
> In order to provide a reliable function, a VNF may adopt a pooling
> mechanism by using a number of VNF instances providing the same function,
> which we call a =E2=80=9CVNF Pool=E2=80=9D. Conceptionally, a Pool Manage=
r is used to
> manage the VNF Pool, e.g., selects active/standby VNF instances, and
> potentially interacts with a service control entity. Such a service
> control entity is an entity that orchestrates a set of network functions =
to
> build network services. The major benefit of using VNF Pool is that
> reliability mechanisms such as redundancy model are achieved by the VNF
> Pool inside the VNF and thus not visible to the service control entity. A
> VNF Pool-enabled VNF still appears as a normal VNF when orchestrated by a=
 service
> control entity.
>
>
>
> Questions that are raised by the addition of a pooling mechanism to VNF
> include:
>
> =C2=B7           How to manage the redundancy model, e.g., select
> active/standby VNF instances in a VNF Pool?
>
> =C2=B7           What pool states need to be maintained to support the po=
oling
> mechanism itself, and how are such states maintained?
>
> =C2=B7           What information is exchanged between a VNF and a servic=
e
> control entity? For example, how can a VNF Pool be addressed by the servi=
ce
> control entity?
>
> =C2=B7           When a live VNF instance goes out of service, how does t=
he
> service control entity learn which instance in a VNF Pool will replace it=
,
> and learn the characteristics of the new instance?
>
> The WG initially focuses on several reliability mechanisms that are mainl=
y
> associated with a redundancy model based on a VNF Pool in a VNF. Addition=
al
> mechanisms that may be needed include state maintenance in a VNF Pool
> only for pooling purpose (service state synchronization is out of scope).
> The WG assumes that a VNF Pool contains redundant VNF instances of same
> functional type. Different types of VNFs are envisoned to be held in
> separate VNF Pools. The WG will address the reliability of an individual
> VNF, but not the reliability related to the control or the routing
> between adjacent VNFs that can form a network service.
>
> Specifically, the WG will work on the following technical aspects:
>
> =C2=B7           Redundancy management within a VNF Pool, such as the
> signaling between the Pool Manager and the instances in the pool for
> instance registration, backup instances selection, and switching between
> active and standby instances.
>
> =C2=B7           The protocol between the Pool Manager and the underlying
> network to collect the network information required for appropriate
> placement/selection of backup instances.
>
> =C2=B7           The protocol between a VNF and the service control entit=
y to
> exchange operational information between a VNF Pool and the service
> control entity.
>
> =C2=B7           Identify and analyze reliable transport protocols, such =
as
> MPTCP and SCTP for reliable delivery of the messages associated with the
> redundancy management within a VNF Pool.
>
> =C2=B7           Analysis of pooling security characteristics and require=
ments
> to identify and mitigate threats against the pooling mechanism.
> Identification of an appropriate trust model between pool members, and
> between pool members and Pool Manager.
>
> The WG plans to deliver a problem statement, a set of use cases, VNF Pool
> requirements and an architecture covering the aforementioned technical
> aspects, and applicability and gap analysis of existing technologies such
> as RSerPool. It is our expectation that we will be able to rely heavily o=
n
> existing IETF technologies, but that gaps will be found around problems
> like redundancy mechanisms, state maintenance solely for pooling purposes=
,
> reliable transport, and trust/security, all of which will need to be
> considered and addressed. The WG will include consideration of the
> manageability of a VNF Pool. The WG will seek re-chartering before adopti=
ng
> any work to develop new, or extend existing, protocols.
>
>
>
> In particular, we will work closely with the SFC WG, as we believe that
> SFC and VNF Pool are independent but complementary. SFC would essentially
> see a VNF Pool-enabled VNF as a normal service function and therefore be
> able to merge it into an SFC just like any other service functions.
> Information exchanged between the VNF Pool and the SFC may include some
> operational information from the VNF Pool including the pool address, poo=
l
> instance characteristic, and so on, as requested by the SFC WG.
>
>
>
> Goals and Milestones:
>
> December 2014 - Submit VNFPool Problem Statement to IESG for publication
> as Informational
>
> April 2015 - Submit VNFPool Use Cases to IESG for publication as
> Informational
>
> August 2015 - Submit VNFPool Requirements, including the manageability of
> VNF Pool to IESG for publication as Informational
>
> August 2015 - Submit VNFPool Architecture to IESG for publication as
> Proposed Standard
>
> December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG
> for publication as Informational
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
> Your comments and suggestions to the charter text are highly appreciated!
>
>
>
> Thanks.
>
>
>
> -Ning
>
> _______________________________________________
> vnfpool mailing list
> vnfpool@ietf.org
> https://www.ietf.org/mailman/listinfo/vnfpool
>
>

--001a11c1263269c0e404fb07b16e
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<div dir=3D"ltr">Georgios,<div><br></div><div>I support the proposed charte=
r in general, and this proposed change in particular. This is important wor=
k and is a very necessary part of a VNF implementation. Working on it in th=
e IETF allows us to take advantage of related experience and expertise and =
have output that&#39;s useful to the work in the SFC WG.</div>

<div><br></div><div>Cheers,</div><div>Andy</div></div><div class=3D"gmail_e=
xtra"><br><br><div class=3D"gmail_quote">On Wed, Jun 4, 2014 at 2:26 PM,  <=
span dir=3D"ltr">&lt;<a href=3D"mailto:karagian@cs.utwente.nl" target=3D"_b=
lank">karagian@cs.utwente.nl</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">




<div lang=3D"ZH-CN" vlink=3D"purple" link=3D"blue">
<div style=3D"direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt=
"><span lang=3D"DE">
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Hi Ning,
<u></u>
 <u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">The charter looks good to me!</span></p=
>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u><u></u></span>=C2=A0</p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">In order to solve the state synchronisa=
tion issue, you may want to modify the sentence from:<u></u><u></u></span><=
/p>

<div class=3D"">
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Additional mechanisms that may be neede=
d include state maintenance in a VNF Pool only for pooling purpose
 (service state synchronization is out of scope). <u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"></span>=C2=A0</p>
</div><p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;C=
OLOR:black;FONT-SIZE:10pt" lang=3D"EN-GB">INTO:<u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Service state synchronization is out of=
 scope. However, state maintenance mechanisms required in a VNF pool
 for pooling purposes are also in scope.<u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Diego, Melinda, does the above change a=
ddress your concerns.<u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Best regards,<u></u><u></u></span></p>
<p><span style=3D"FONT-FAMILY:&#39;Tahoma&#39;,&#39;sans-serif&#39;;COLOR:b=
lack;FONT-SIZE:10pt" lang=3D"EN-GB">Georgios<u></u><u></u></span></p>
<p style=3D"TEXT-ALIGN:left;MARGIN:0cm 0cm 0pt" class=3D"MsoNormal" align=
=3D"left"><span lang=3D"EN-GB"><u></u><font face=3D"Times New Roman">=C2=A0=
</font><u></u></span></p>
<p></p>
<p><span lang=3D"DE"></span></p>
<p></p>
</span>
<div style=3D"FONT-FAMILY:Times New Roman;COLOR:#000000;FONT-SIZE:16px">
<hr>
<div style=3D"DIRECTION:ltr"><font color=3D"#000000" face=3D"Tahoma"><b>Van=
:</b> vnfpool [<a href=3D"mailto:vnfpool-bounces@ietf.org" target=3D"_blank=
">vnfpool-bounces@ietf.org</a>] namens Zongning [<a href=3D"mailto:zongning=
@huawei.com" target=3D"_blank">zongning@huawei.com</a>]<br>


<b>Verzonden:</b> dinsdag 3 juni 2014 11:35<br>
<b>Aan:</b> <a href=3D"mailto:vnfpool@ietf.org" target=3D"_blank">vnfpool@i=
etf.org</a><br>
<b>Onderwerp:</b> [vnfpool] new VNFPool draft charter<br>
</font><br>
</div><div><div class=3D"h5">
<div></div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:</span></p>
<p style=3D"MARGIN-LEFT:18pt"><span lang=3D"EN-US"><span>1)<span style=3D"F=
ONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">We narrow down our scope to only =
focus on the redundancy model and the related interfaces associated with th=
e VNF Pool in a single VNF.</span></p>
<p style=3D"MARGIN-LEFT:18pt"><span lang=3D"EN-US"><span>2)<span style=3D"F=
ONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">Service state synchronization bet=
ween VNF instances is out-of-scope. We may consider how to maintain the poo=
l states in a VNF Pool only for pooling purpose.</span></p>
<p style=3D"MARGIN-LEFT:18pt"><span lang=3D"EN-US"><span>3)<span style=3D"F=
ONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">We assume that a VNF Pool contain=
s redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"></span></p>
<p style=3D"MARGIN-LEFT:18pt"><span lang=3D"EN-US"><span>4)<span style=3D"F=
ONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">We do not address reliability rel=
ated control or routing between adjacent VNFs in the service graph. This is=
 also applied to update the relation between VNF Pool and SFC WG.</span></p=
>


<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators&#39; networks and data =
center networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.</span>=
</p>


<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a =E2=80=9CVNF Pool=E2=80=9D.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:24.6pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">How to manage the redundancy mode=
l, e.g., select active/standby VNF instances in a VNF Pool?</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:24.6pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">What pool states need to be maint=
ained to support the pooling mechanism itself, and how are such states main=
tained?</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:24.6pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">What information is exchanged bet=
ween a VNF and a service control entity? For example, how can a VNF Pool be=
 addressed by the service control entity?</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:24.6pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">When a live VNF instance goes out=
 of service, how does the service control entity learn which instance in a =
VNF Pool will replace it, and learn the characteristics of the new instance=
?</span></p>


<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains redundant VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:38.85pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">Redundancy management within a VN=
F Pool, such as the signaling between the Pool Manager and the instances in=
 the pool for instance registration, backup instances selection, and switch=
ing between active and standby instances.</span></p>


<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:38.85pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">The protocol between the Pool Man=
ager and the underlying network to collect the network information required=
 for appropriate placement/selection of backup instances.</span></p>
<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:38.85pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">The protocol between a VNF and th=
e service control entity to exchange operational information between a VNF =
Pool</span><span lang=3D"DE"> and the service control entity.</span><span l=
ang=3D"EN-US"></span></p>


<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:38.85pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">Identify and analyze reliable tra=
nsport protocols, such as MPTCP and SCTP for reliable delivery of the messa=
ges associated with the redundancy management within a VNF Pool.</span></p>


<p style=3D"LINE-HEIGHT:150%;MARGIN-LEFT:38.85pt">
<span style=3D"FONT-FAMILY:Symbol" lang=3D"EN-US"><span>=C2=B7<span style=
=3D"FONT:7pt &#39;Times New Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span lang=3D"EN-US">Analysis of pooling security char=
acteristics and requirements to identify and mitigate threats against the p=
ooling mechanism. Identification of an appropriate trust model between pool=
 members, and between pool members
 and Pool Manager.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"COLOR:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Information exchanged between the =
VNF Pool and the SFC may include
 some operational information from the VNF Pool including the pool address,=
 pool instance characteristic, and so on, as requested by the SFC WG.</span=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:</span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning</span></p>
</div>
</div>
</div></div></div>
</div>
</div>

<br>_______________________________________________<br>
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>https://www.ietf.org/mailman/listinfo/vnfpool</a><br>
<br></blockquote></div><br></div>

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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Ning,

I made some wording changes to the proposed charter. The attached Word docu=
ment has the changes mark, making it easier to see. In case the mailing lis=
t doesn't allow attachment, here is the proposed changes.

Should we also add a paragraph to show why/how VNFpool is different from SF=
C?

Linda


Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be instantiated to build network servi=
ces.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to achieve higher reliability, a pool of VNFs that perform the sam=
e function can be grouped together for the network services.  Conceptionall=
y, multiple instances of a same function are grouped together and managed b=
y its Pool Manager. Different functions have different pool manager.  A Poo=
l Manager is responsible for monitoring  the status of the instances in the=
 pool, selecting active/standby instances for specific services, and potent=
ially interacts with other entities, e.g. service control entity or  servic=
e orchestration system. The major benefit of using VNF Pool is that reliabi=
lity mechanisms such as redundancy & protection are achieved by the VNF Poo=
l and thus not visible to the service control entity. A VNF Pool-enabled VN=
F still appears as a normal VNF when orchestrated by a service control enti=
ty.[L1]

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

*     How to manage the redundancy model, e.g., select active/standby VNF i=
nstances in a VNF Pool?

*     What pool states need to be maintained to support the pooling mechani=
sm itself, and how are such states maintained?

*     What information is exchanged between a VNF and a service control ent=
ity? For example, how can a VNF Pool be addressed by the service control en=
tity?

*     When a live VNF instance goes out of service, how does the service co=
ntrol entity learn which instance in a VNF Pool will replace it, and learn =
the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms might include state maintenance of instances in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains identical VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.





From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Zongning
Sent: Tuesday, June 03, 2014 4:36 AM
To: vnfpool@ietf.org
Subject: [vnfpool] new VNFPool draft charter

Hi, folks,

Please see the below new draft charter of VNFPool. We believe that we have =
updated the charter to address most of the comments from London BoF. Main c=
hanges are:

1)       We narrow down our scope to only focus on the redundancy model and=
 the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is out-of-scop=
e. We may consider how to maintain the pool states in a VNF Pool only for p=
ooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of same=
 functional type. Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.

4)       We do not address reliability related control or routing between a=
djacent VNFs in the service graph. This is also applied to update the relat=
ion between VNF Pool and SFC WG.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to provide a reliable function, a VNF may adopt a pooling mechanis=
m by using a number of VNF instances providing the same function, which we =
call a "VNF Pool". Conceptionally, a Pool Manager is used to manage the VNF=
 Pool, e.g., selects active/standby VNF instances, and potentially interact=
s with a service control entity. Such a service control entity is an entity=
 that orchestrates a set of network functions to build network services. Th=
e major benefit of using VNF Pool is that reliability mechanisms such as re=
dundancy model are achieved by the VNF Pool inside the VNF and thus not vis=
ible to the service control entity. A VNF Pool-enabled VNF still appears as=
 a normal VNF when orchestrated by a service control entity.

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

*     How to manage the redundancy model, e.g., select active/standby VNF i=
nstances in a VNF Pool?

*     What pool states need to be maintained to support the pooling mechani=
sm itself, and how are such states maintained?

*     What information is exchanged between a VNF and a service control ent=
ity? For example, how can a VNF Pool be addressed by the service control en=
tity?

*     When a live VNF instance goes out of service, how does the service co=
ntrol entity learn which instance in a VNF Pool will replace it, and learn =
the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms that may be needed include state maintenance in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains redundant VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.
Specifically, the WG will work on the following technical aspects:

*        Redundancy management within a VNF Pool, such as the signaling bet=
ween the Pool Manager and the instances in the pool for instance registrati=
on, backup instances selection, and switching between active and standby in=
stances.

*        The protocol between the Pool Manager and the underlying network t=
o collect the network information required for appropriate placement/select=
ion of backup instances.

*        The protocol between a VNF and the service control entity to excha=
nge operational information between a VNF Pool and the service control enti=
ty.

*        Identify and analyze reliable transport protocols, such as MPTCP a=
nd SCTP for reliable delivery of the messages associated with the redundanc=
y management within a VNF Pool.

*        Analysis of pooling security characteristics and requirements to i=
dentify and mitigate threats against the pooling mechanism. Identification =
of an appropriate trust model between pool members, and between pool member=
s and Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, VNF Pool r=
equirements and an architecture covering the aforementioned technical aspec=
ts, and applicability and gap analysis of existing technologies such as RSe=
rPool. It is our expectation that we will be able to rely heavily on existi=
ng IETF technologies, but that gaps will be found around problems like redu=
ndancy mechanisms, state maintenance solely for pooling purposes, reliable =
transport, and trust/security, all of which will need to be considered and =
addressed. The WG will include consideration of the manageability of a VNF =
Pool. The WG will seek re-chartering before adopting any work to develop ne=
w, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Information e=
xchanged between the VNF Pool and the SFC may include some operational info=
rmation from the VNF Pool including the pool address, pool instance charact=
eristic, and so on, as requested by the SFC WG.

Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 Informational
April 2015 - Submit VNFPool Use Cases to IESG for publication as Informatio=
nal
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as Informational
August 2015 - Submit VNFPool Architecture to IESG for publication as Propos=
ed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter text are highly appreciated!

Thanks.

-Ning
________________________________

 [L1]Not clear of the intent.



Do you mean: "VNF instances in the VNF pool are still visible by the servic=
e control entity"?

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rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">Ning,=
 <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">I mad=
e some wording changes to the proposed charter. The attached Word document =
has the changes mark, making it easier to see. In case the mailing list doe=
sn&#8217;t allow attachment, here is the proposed
 changes. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">Shoul=
d we also add a paragraph to show why/how VNFpool is different from SFC?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">Linda=
<o:p></o:p></span></p>
<div style=3D"mso-element:para-border-div;border:none;border-bottom:solid w=
indowtext 1.0pt;padding:0in 0in 1.0pt 0in">
<p class=3D"MsoNormal" style=3D"border:none;padding:0in"><span style=3D"fon=
t-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Network functions such as firewalls, load balancers,=
 and WAN optimizers are conventionally deployed as specialized hardware ser=
vers in both network operators' networks and data center networks as the bu=
ilding blocks of the network services.
 There is a trend to implement such network functions as software instances=
 running on general purpose servers, via a virtualization layer (i.e., hype=
rvisors). These virtualized functions are called Virtualized Network Functi=
ons (VNFs), which can be instantiated
 to build network services.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The use of VNFs introduces additional challenges to =
the reliability of the provided network services. A single VNF instance wou=
ld typically not have built-in reliability mechanisms on its host (i.e., a =
general purpose server). Instead,
 there are more factors of risk such as software failure at various levels =
including hypervisors and virtual machines, hardware failure, and instance =
migration that can make a VNF instance unreliable.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In order to achieve higher reliability, a pool of VN=
Fs that perform the same function can be grouped together for the network s=
ervices.&nbsp;
<span lang=3D"DE">Conceptionally, multiple instances of a same function are=
 grouped together and managed by its Pool Manager. Different functions have=
 different pool manager.&nbsp; A
</span>Pool Manager is responsible for monitoring&nbsp; the status of the i=
nstances in the pool, selecting active/standby instances for specific servi=
ces, and potentially interacts with other entities, e.g. service control en=
tity or&nbsp; service orchestration system.
 The major benefit of using VNF Pool is that reliability mechanisms such as=
 redundancy &amp; protection are achieved by the VNF Pool and thus not visi=
ble to the service control entity.
<a style=3D"mso-comment-reference:L_1;mso-comment-date:20140604T1509">A VNF=
 Pool-enabled VNF still appears as a normal VNF when orchestrated by
</a><span style=3D"mso-comment-continuation:1"><span lang=3D"DE">a </span>s=
ervice control entity.</span><span class=3D"MsoCommentReference"><span styl=
e=3D"font-size:8.0pt"><![if !supportAnnotations]><a class=3D"msocomanchor" =
id=3D"_anchor_1" onmouseover=3D"msoCommentShow('_anchor_1','_com_1')" onmou=
seout=3D"msoCommentHide('_com_1')" href=3D"#_msocom_1" language=3D"JavaScri=
pt" name=3D"_msoanchor_1">[L1]</a><![endif]>&nbsp;</span></span><o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Questions that are raised by the addition of a pooli=
ng mechanism to VNF include:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>How to manage the redundancy model, e.g., se=
lect active/standby VNF instances in a VNF Pool?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>What pool states need to be maintained to su=
pport the pooling mechanism itself, and how are such states maintained?<o:p=
></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>What information is exchanged between a VNF =
and a service control entity? For example, how can a VNF Pool be addressed =
by the service control entity?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>When a live VNF instance goes out of service=
, how does the service control entity learn which instance in a VNF Pool wi=
ll replace it, and learn the characteristics of the new instance?<o:p></o:p=
></p>
<p class=3D"MsoNormal">The WG initially focuses on several reliability mech=
anisms that are mainly associated with a redundancy model based on a VNF Po=
ol in a VNF. Additional mechanisms might include state maintenance of insta=
nces in a VNF Pool<span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span> assume<span lang=3D"DE">s</span> that a VNF Pool contains ide=
ntical VNF instances of same functional type.
<span lang=3D"DE">Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.
</span>The WG will address the reliability of an individual VNF<span lang=
=3D"DE">, but not the</span> reliability related to the control or the rout=
ing between adjacent VNFs
<span lang=3D"DE">that can form a network service</span>.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div style=3D"mso-element:para-border-div;border:none;border-bottom:solid w=
indowtext 1.0pt;padding:0in 0in 1.0pt 0in">
<p class=3D"MsoNormal" style=3D"border:none;padding:0in"><span style=3D"fon=
t-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quo=
t;">From:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahom=
a&quot;,&quot;sans-serif&quot;"> vnfpool [mailto:vnfpool-bounces@ietf.org]
<b>On Behalf Of </b>Zongning<br>
<b>Sent:</b> Tuesday, June 03, 2014 4:36 AM<br>
<b>To:</b> vnfpool@ietf.org<br>
<b>Subject:</b> [vnfpool] new VNFPool draft charter<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><o:p>&nbsp;=
</o:p></p>
<p class=3D"MsoNormal">Hi, folks,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please see the below new draft charter of VNFPool. W=
e believe that we have updated the charter to address most of the comments =
from London BoF. Main changes are:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.25in;text-indent:-.25in=
;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">1)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>We narrow down our scope to only focus on the redun=
dancy model and the related interfaces associated with the VNF Pool in a si=
ngle VNF.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.25in;text-indent:-.25in=
;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">2)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Service state synchronization between VNF instances=
 is out-of-scope. We may consider how to maintain the pool states in a VNF =
Pool only for pooling purpose.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.25in;text-indent:-.25in=
;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">3)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>We assume that a VNF Pool contains redundant VNF in=
stances of same functional type.
<span lang=3D"DE">Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.</span><o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.25in;text-indent:-.25in=
;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">4)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>We do not address reliability related control or ro=
uting between adjacent VNFs in the service graph. This is also applied to u=
pdate the relation between VNF Pool and SFC WG.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></p>
<p class=3D"MsoNormal">Network functions such as firewalls, load balancers,=
 and WAN optimizers are conventionally deployed as specialized hardware ser=
vers in both network operators' networks and data center networks as the bu=
ilding blocks of the network services.
 There is a trend to implement such network functions as software instances=
 running on general purpose servers, via a virtualization layer (i.e., hype=
rvisors). These virtualized functions are called Virtualized Network Functi=
ons (VNFs), which can be used to
 build network services.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The use of VNFs introduces additional challenges to =
the reliability of the provided network services. A single VNF instance wou=
ld typically not have built-in reliability mechanisms on its host (i.e., a =
general purpose server). Instead,
 there are more factors of risk such as software failure at various levels =
including hypervisors and virtual machines, hardware failure, and instance =
migration that can make a VNF instance unreliable.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In order to provide <span lang=3D"DE">a </span>relia=
ble function, a VNF may adopt a pooling mechanism by using a number of VNF =
instances providing the same function, which we call a &#8220;VNF Pool&#822=
1;.
<span lang=3D"DE">Conceptionally, a </span>Pool Manager is used to manage t=
he VNF Pool, e.g., selects active/standby VNF instances, and potentially in=
teracts with a service control entity.
<span lang=3D"DE">Such a </span>service control entity is an entity that or=
chestrates a set of network functions to build network services. The major =
benefit of using VNF Pool is that reliability mechanisms such as redundancy=
 model are achieved by the VNF Pool
 inside the VNF and thus not visible to the service control entity. A VNF P=
ool-enabled VNF still appears as a normal VNF when orchestrated by
<span lang=3D"DE">a </span>service control entity.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Questions that are raised by the addition of a pooli=
ng mechanism to VNF include:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>How to manage the redundancy model, e.g., se=
lect active/standby VNF instances in a VNF Pool?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>What pool states need to be maintained to su=
pport the pooling mechanism itself, and how are such states maintained?<o:p=
></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>What information is exchanged between a VNF =
and a service control entity? For example, how can a VNF Pool be addressed =
by the service control entity?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-.05in;line-height:150%;mso-l=
ist:l2 level1 lfo4">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>When a live VNF instance goes out of service=
, how does the service control entity learn which instance in a VNF Pool wi=
ll replace it, and learn the characteristics of the new instance?<o:p></o:p=
></p>
<p class=3D"MsoNormal">The WG initially focuses on several reliability mech=
anisms that are mainly associated with a redundancy model based on a VNF Po=
ol in a VNF. Additional mechanisms that may be needed include state mainten=
ance in a VNF Pool<span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span> assume<span lang=3D"DE">s</span> that a VNF Pool contains red=
undant VNF instances of same functional type.
<span lang=3D"DE">Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.
</span>The WG will address the reliability of an individual VNF<span lang=
=3D"DE">, but not the</span> reliability related to the control or the rout=
ing between adjacent VNFs
<span lang=3D"DE">that can form a network service</span>.<o:p></o:p></p>
<p class=3D"MsoNormal">Specifically, the WG will work on the following tech=
nical aspects:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>Redundancy management within a VNF Pool, suc=
h as the signaling between the Pool Manager and the instances in the pool f=
or instance registration, backup instances selection, and switching between=
 active and standby instances.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>The protocol between the Pool Manager and th=
e underlying network to collect the network information required for approp=
riate placement/selection of backup instances.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>The protocol between a VNF and the service c=
ontrol entity to exchange operational information between a VNF Pool<span l=
ang=3D"DE"> and the service control entity.</span><o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>Identify and analyze reliable transport prot=
ocols, such as MPTCP and SCTP for reliable delivery of the messages associa=
ted with the redundancy management within a VNF Pool.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>Analysis of pooling security characteristics=
 and requirements to identify and mitigate threats against the pooling mech=
anism. Identification of an appropriate trust model between pool members, a=
nd between pool members and Pool
 Manager.<o:p></o:p></p>
<p class=3D"MsoNormal">The WG plans to deliver a problem statement, a set o=
f use cases, VNF Pool requirements and an architecture covering the aforeme=
ntioned technical aspects, and applicability and gap analysis of existing t=
echnologies such as RSerPool. It is
 our expectation that we will be able to rely heavily on existing IETF tech=
nologies, but that gaps will be found around problems like redundancy mecha=
nisms, state maintenance<span lang=3D"DE"> solely for pooling purposes</spa=
n>, reliable transport, and trust/security,
 all of which will need to be considered and addressed. The WG will include=
 consideration of the manageability of a VNF Pool. The WG will seek re-char=
tering before adopting any work to develop new, or extend existing, protoco=
ls.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In particular, we will work closely with the SFC WG,=
 as we believe that SFC and VNF Pool are independent but complementary.
<span style=3D"color:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Information exchanged between the =
VNF Pool and the SFC may include some
 operational information from the VNF Pool including the pool address, pool=
 instance characteristic, and so on, as requested by the SFC WG.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Goals and Milestones:<o:p></o:p></p>
<p class=3D"MsoNormal">December 2014 - Submit VNFPool Problem Statement to =
IESG for publication as Informational<o:p></o:p></p>
<p class=3D"MsoNormal">April 2015 - Submit VNFPool Use Cases to IESG for pu=
blication as Informational<o:p></o:p></p>
<p class=3D"MsoNormal">August 2015 - Submit VNFPool Requirements, including=
 the manageability of VNF Pool to IESG for publication as Informational<o:p=
></o:p></p>
<p class=3D"MsoNormal">August 2015 - Submit VNFPool Architecture to IESG fo=
r publication as Proposed Standard<o:p></o:p></p>
<p class=3D"MsoNormal">December 2015 - Submit Applicability and Gap Analysi=
s of RSerPool to IESG for publication as Informational<o:p></o:p></p>
<p class=3D"MsoNormal">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Your comments and suggestions to the charter text ar=
e highly appreciated!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">-Ning<o:p></o:p></p>
</div>
<div style=3D"mso-element:comment-list"><![if !supportAnnotations]>
<hr class=3D"msocomoff" align=3D"left" size=3D"1" width=3D"33%">
<![endif]>
<div style=3D"mso-element:comment"><![if !supportAnnotations]>
<div id=3D"_com_1" class=3D"msocomtxt" language=3D"JavaScript" onmouseover=
=3D"msoCommentShow('_anchor_1','_com_1')" onmouseout=3D"msoCommentHide('_co=
m_1')">
<![endif]><span style=3D"mso-comment-author:L73504"><![if !supportAnnotatio=
ns]><a name=3D"_msocom_1"></a><![endif]></span>
<p class=3D"MsoCommentText"><span class=3D"MsoCommentReference"><span style=
=3D"font-size:8.0pt">&nbsp;<![if !supportAnnotations]><a href=3D"#_msoancho=
r_1" class=3D"msocomoff">[L1]</a><![endif]></span></span>Not clear of the i=
ntent.
</p>
<p class=3D"MsoCommentText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoCommentText">Do you mean: &#8220;VNF instances in the VNF po=
ol are still visible by the service control entity&#8221;?
</p>
<![if !supportAnnotations]></div>
<![endif]></div>
</div>
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--_004_4A95BA014132FF49AE685FAB4B9F17F645D2E19Edfweml701chmchi_--


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From: "King, Daniel" <d.king@lancaster.ac.uk>
To: "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Subject: Re: [vnfpool] new VNFPool draft charter
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Hi All,=20

Thanks Ning and Melinda for the draft charter text, overall the direction a=
nd work items look great to me.=20

Still, being overly opinionated, I do have a few comments:

Charter Text
- Maybe break existing bullet, into two bullets (and minor grammar fix - "t=
he Pool Manager":=20

o Analysis of pooling security characteristics and requirements to identify=
 and mitigate threats against the pooling mechanism.=20
o Identification of an appropriate trust model between pool members, and be=
tween pool members and the Pool Manager.

- Also, does Trust imply Policy, or vice versa?    =20

- Adding [secure] as requirement in the transport protocol selection. Or ma=
ybe I am predetermining the protocol requirements, but then again we alread=
y state "reliable" mechanism:

o Investigate and select a [secure] and reliable transport protocol, such a=
s MPTCP and SCTP, for delivery of the messages associated with the redundan=
cy management within a VNF Pool.

Charter Milestones
- Perhaps specify a security should be investigated along with manageabilit=
y in the following milestone:

"August 2015 - Submit VNFPool Requirements, including the manageability and=
 security of VNF Pools to the IESG for publication as an Informational docu=
ment."

- Slight clean up (grammar and adding the word "document") on the charter m=
ilestones, these would become (note the inclusion of "security"):

December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 an Informational document.
April 2015 - Submit VNFPool Use Cases to IESG for publication as an Informa=
tional document.
August 2015 - Submit VNFPool Requirements, including the manageability and =
security of VNF Pools to the IESG for publication as an Informational docum=
ent.
August 2015 - Submit VNFPool Architecture to IESG for publication as a Prop=
osed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational document.

Spelling NITs in Charter Text
- "Conceptionally" to "Conceptually"
- " envisoned " to "envisioned"

Br, Dan.=20


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On 6/4/14 1:27 PM, King, Daniel wrote:
> - Also, does Trust imply Policy, or vice versa?

Typically in an IETF context it implies mechanism.

> Charter Milestones - Perhaps specify a security should be
> investigated along with manageability in the following milestone:
> 
> "August 2015 - Submit VNFPool Requirements, including the
> manageability and security of VNF Pools to the IESG for publication
> as an Informational document."

My general sense is that doing security requirements
separately is generally not successful, and that
including them in this sort of context tends to lead
to overly generic requirements that may not be
applicable to the technology that's ultimately adopted.

Melinda


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+1

On 4 Jun 2014, at 21:32 , Andrew G. Malis <agmalis@gmail.com<mailto:agmalis=
@gmail.com>> wrote:

Georgios,

I support the proposed charter in general, and this proposed change in part=
icular. This is important work and is a very necessary part of a VNF implem=
entation. Working on it in the IETF allows us to take advantage of related =
experience and expertise and have output that's useful to the work in the S=
FC WG.

Cheers,
Andy


On Wed, Jun 4, 2014 at 2:26 PM, <karagian@cs.utwente.nl<mailto:karagian@cs.=
utwente.nl>> wrote:

Hi Ning,



The charter looks good to me!



In order to solve the state synchronisation issue, you may want to modify t=
he sentence from:



Additional mechanisms that may be needed include state maintenance in a VNF=
 Pool only for pooling purpose (service state synchronization is out of sco=
pe).



INTO:



Service state synchronization is out of scope. However, state maintenance m=
echanisms required in a VNF pool for pooling purposes are also in scope.



Diego, Melinda, does the above change address your concerns.



Best regards,

Georgios





________________________________
Van: vnfpool [vnfpool-bounces@ietf.org<mailto:vnfpool-bounces@ietf.org>] na=
mens Zongning [zongning@huawei.com<mailto:zongning@huawei.com>]
Verzonden: dinsdag 3 juni 2014 11:35
Aan: vnfpool@ietf.org<mailto:vnfpool@ietf.org>
Onderwerp: [vnfpool] new VNFPool draft charter

Hi, folks,

Please see the below new draft charter of VNFPool. We believe that we have =
updated the charter to address most of the comments from London BoF. Main c=
hanges are:

1)       We narrow down our scope to only focus on the redundancy model and=
 the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is out-of-scop=
e. We may consider how to maintain the pool states in a VNF Pool only for p=
ooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of same=
 functional type. Different types of VNFs are envisoned to be held in separ=
ate VNF Pools.

4)       We do not address reliability related control or routing between a=
djacent VNFs in the service graph. This is also applied to update the relat=
ion between VNF Pool and SFC WG.


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.

In order to provide a reliable function, a VNF may adopt a pooling mechanis=
m by using a number of VNF instances providing the same function, which we =
call a =93VNF Pool=94. Conceptionally, a Pool Manager is used to manage the=
 VNF Pool, e.g., selects active/standby VNF instances, and potentially inte=
racts with a service control entity. Such a service control entity is an en=
tity that orchestrates a set of network functions to build network services=
. The major benefit of using VNF Pool is that reliability mechanisms such a=
s redundancy model are achieved by the VNF Pool inside the VNF and thus not=
 visible to the service control entity. A VNF Pool-enabled VNF still appear=
s as a normal VNF when orchestrated by a service control entity.

Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

=95           How to manage the redundancy model, e.g., select active/stand=
by VNF instances in a VNF Pool?

=95           What pool states need to be maintained to support the pooling=
 mechanism itself, and how are such states maintained?

=95           What information is exchanged between a VNF and a service con=
trol entity? For example, how can a VNF Pool be addressed by the service co=
ntrol entity?

=95           When a live VNF instance goes out of service, how does the se=
rvice control entity learn which instance in a VNF Pool will replace it, an=
d learn the characteristics of the new instance?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool in a VNF. Additional=
 mechanisms that may be needed include state maintenance in a VNF Pool only=
 for pooling purpose (service state synchronization is out of scope). The W=
G assumes that a VNF Pool contains redundant VNF instances of same function=
al type. Different types of VNFs are envisoned to be held in separate VNF P=
ools. The WG will address the reliability of an individual VNF, but not the=
 reliability related to the control or the routing between adjacent VNFs th=
at can form a network service.
Specifically, the WG will work on the following technical aspects:

=95           Redundancy management within a VNF Pool, such as the signalin=
g between the Pool Manager and the instances in the pool for instance regis=
tration, backup instances selection, and switching between active and stand=
by instances.

=95           The protocol between the Pool Manager and the underlying netw=
ork to collect the network information required for appropriate placement/s=
election of backup instances.

=95           The protocol between a VNF and the service control entity to =
exchange operational information between a VNF Pool and the service control=
 entity.

=95           Identify and analyze reliable transport protocols, such as MP=
TCP and SCTP for reliable delivery of the messages associated with the redu=
ndancy management within a VNF Pool.

=95           Analysis of pooling security characteristics and requirements=
 to identify and mitigate threats against the pooling mechanism. Identifica=
tion of an appropriate trust model between pool members, and between pool m=
embers and Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, VNF Pool r=
equirements and an architecture covering the aforementioned technical aspec=
ts, and applicability and gap analysis of existing technologies such as RSe=
rPool. It is our expectation that we will be able to rely heavily on existi=
ng IETF technologies, but that gaps will be found around problems like redu=
ndancy mechanisms, state maintenance solely for pooling purposes, reliable =
transport, and trust/security, all of which will need to be considered and =
addressed. The WG will include consideration of the manageability of a VNF =
Pool. The WG will seek re-chartering before adopting any work to develop ne=
w, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Information e=
xchanged between the VNF Pool and the SFC may include some operational info=
rmation from the VNF Pool including the pool address, pool instance charact=
eristic, and so on, as requested by the SFC WG.

Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 Informational
April 2015 - Submit VNFPool Use Cases to IESG for publication as Informatio=
nal
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as Informational
August 2015 - Submit VNFPool Architecture to IESG for publication as Propos=
ed Standard
December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG f=
or publication as Informational
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter text are highly appreciated!

Thanks.

-Ning

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&#43;1
<div><br>
<div>
<div>
<div>On 4 Jun 2014, at 21:32 , Andrew G. Malis &lt;<a href=3D"mailto:agmali=
s@gmail.com">agmalis@gmail.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div dir=3D"ltr">Georgios,
<div><br>
</div>
<div>I support the proposed charter in general, and this proposed change in=
 particular. This is important work and is a very necessary part of a VNF i=
mplementation. Working on it in the IETF allows us to take advantage of rel=
ated experience and expertise and
 have output that's useful to the work in the SFC WG.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Andy</div>
</div>
<div class=3D"gmail_extra"><br>
<br>
<div class=3D"gmail_quote">On Wed, Jun 4, 2014 at 2:26 PM, <span dir=3D"ltr=
">&lt;<a href=3D"mailto:karagian@cs.utwente.nl" target=3D"_blank">karagian@=
cs.utwente.nl</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex; border-left:1=
px #ccc solid; padding-left:1ex">
<div lang=3D"ZH-CN">
<div style=3D"direction:ltr; font-family:Tahoma; font-size:10pt"><span lang=
=3D"DE">
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Hi Ning,
<u></u><u></u><u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u>&nbsp;<u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">The charter looks good to me!</span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u><u></u></span>&nbsp;</p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">In order to solve the state synchronisation issue, you may want to mod=
ify the sentence from:<u></u><u></u></span></p>
<div class=3D"">
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u>&nbsp;<u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Additional mechanisms that may be needed include state maintenance in =
a VNF Pool only for pooling purpose (service state synchronization is out o=
f scope).
<u></u><u></u></span></p>
<div><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size=
:10pt"></span>&nbsp;<br class=3D"webkit-block-placeholder">
</div>
</div>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">INTO:<u></u><u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u>&nbsp;<u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Service state synchronization is out of scope. However, state maintena=
nce mechanisms required in a VNF pool for pooling purposes are also in scop=
e.<u></u><u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u>&nbsp;<u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Diego, Melinda, does the above change address your concerns.<u></u><u>=
</u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt"><u></u>&nbsp;<u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Best regards,<u></u><u></u></span></p>
<p><span lang=3D"EN-GB" style=3D"font-family:Tahoma,sans-serif; font-size:1=
0pt">Georgios<u></u><u></u></span></p>
<div style=3D"text-align:left; margin:0cm 0cm 0pt"><span lang=3D"EN-GB"><u>=
</u><font face=3D"Times New Roman">&nbsp;</font><u></u></span></div>
<div><br class=3D"webkit-block-placeholder">
</div>
<div><span lang=3D"DE"></span><br class=3D"webkit-block-placeholder">
</div>
<div><br class=3D"webkit-block-placeholder">
</div>
</span>
<div style=3D"font-family:'Times New Roman'; font-size:16px">
<hr>
<div style=3D"direction:ltr"><font face=3D"Tahoma"><b>Van:</b> vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org" target=3D"_blank">vnfpool-bounces@=
ietf.org</a>] namens Zongning [<a href=3D"mailto:zongning@huawei.com" targe=
t=3D"_blank">zongning@huawei.com</a>]<br>
<b>Verzonden:</b> dinsdag 3 juni 2014 11:35<br>
<b>Aan:</b> <a href=3D"mailto:vnfpool@ietf.org" target=3D"_blank">vnfpool@i=
etf.org</a><br>
<b>Onderwerp:</b> [vnfpool] new VNFPool draft charter<br>
</font><br>
</div>
<div>
<div class=3D"h5">
<div></div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:</span></p>
<p style=3D"margin-left:18pt"><span lang=3D"EN-US"><span>1)<span style=3D"f=
ont:7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We narrow down our scope to only =
focus on the redundancy model and the related interfaces associated with th=
e VNF Pool in a single VNF.</span></p>
<p style=3D"margin-left:18pt"><span lang=3D"EN-US"><span>2)<span style=3D"f=
ont:7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Service state synchronization bet=
ween VNF instances is out-of-scope. We may consider how to maintain the poo=
l states in a VNF Pool only for pooling purpose.</span></p>
<p style=3D"margin-left:18pt"><span lang=3D"EN-US"><span>3)<span style=3D"f=
ont:7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We assume that a VNF Pool contain=
s redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"></span></p>
<p style=3D"margin-left:18pt"><span lang=3D"EN-US"><span>4)<span style=3D"f=
ont:7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">We do not address reliability rel=
ated control or routing between adjacent VNFs in the service graph. This is=
 also applied to update the relation between VNF Pool and SFC WG.</span></p=
>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.</span>=
</p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a =93VNF Pool=94.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:</span></p>
<p style=3D"line-height:150%; margin-left:24.6pt"><span lang=3D"EN-US" styl=
e=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman'=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">How to manage the redundancy mode=
l, e.g., select active/standby VNF instances in a VNF Pool?</span></p>
<p style=3D"line-height:150%; margin-left:24.6pt"><span lang=3D"EN-US" styl=
e=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman'=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">What pool states need to be maint=
ained to support the pooling mechanism itself, and how are such states main=
tained?</span></p>
<p style=3D"line-height:150%; margin-left:24.6pt"><span lang=3D"EN-US" styl=
e=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman'=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">What information is exchanged bet=
ween a VNF and a service control entity? For example, how can a VNF Pool be=
 addressed by the service control entity?</span></p>
<p style=3D"line-height:150%; margin-left:24.6pt"><span lang=3D"EN-US" styl=
e=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman'=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">When a live VNF instance goes out=
 of service, how does the service control entity learn which instance in a =
VNF Pool will replace it, and learn the characteristics of the new instance=
?</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains redundant VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:</span></p>
<p style=3D"line-height:150%; margin-left:38.85pt"><span lang=3D"EN-US" sty=
le=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman=
'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Redundancy management within a VN=
F Pool, such as the signaling between the Pool Manager and the instances in=
 the pool for instance registration, backup instances selection, and switch=
ing between active and standby instances.</span></p>
<p style=3D"line-height:150%; margin-left:38.85pt"><span lang=3D"EN-US" sty=
le=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman=
'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">The protocol between the Pool Man=
ager and the underlying network to collect the network information required=
 for appropriate placement/selection of backup instances.</span></p>
<p style=3D"line-height:150%; margin-left:38.85pt"><span lang=3D"EN-US" sty=
le=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman=
'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">The protocol between a VNF and th=
e service control entity to exchange operational information between a VNF =
Pool</span><span lang=3D"DE"> and the service control entity.</span><span l=
ang=3D"EN-US"></span></p>
<p style=3D"line-height:150%; margin-left:38.85pt"><span lang=3D"EN-US" sty=
le=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman=
'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Identify and analyze reliable tra=
nsport protocols, such as MPTCP and SCTP for reliable delivery of the messa=
ges associated with the redundancy management within a VNF Pool.</span></p>
<p style=3D"line-height:150%; margin-left:38.85pt"><span lang=3D"EN-US" sty=
le=3D"font-family:Symbol"><span>=B7<span style=3D"font:7pt 'Times New Roman=
'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><span lang=3D"EN-US">Analysis of pooling security char=
acteristics and requirements to identify and mitigate threats against the p=
ooling mechanism. Identification of an appropriate trust model between pool=
 members, and between pool members
 and Pool Manager.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"">SFC would essentially see a VNF Pool-enabled VNF as a norm=
al service function and therefore be able to merge it into an SFC just like=
 any other service functions. Information exchanged between the VNF Pool an=
d the SFC may include some operational
 information from the VNF Pool including the pool address, pool instance ch=
aracteristic, and so on, as requested by the SFC WG.</span></span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:</span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.</span></p>
<div><span lang=3D"EN-US"></span>&nbsp;<br class=3D"webkit-block-placeholde=
r">
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning</span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/vnfpool" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/vnfpool</a><br>
<br>
</blockquote>
</div>
<br>
</div>
</blockquote>
</div>
<br>
<div><span class=3D"Apple-style-span" style=3D"border-collapse:separate; co=
lor:rgb(0,0,0); font-family:Helvetica; font-style:normal; font-variant:norm=
al; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:=
2; text-indent:0px; text-transform:none; white-space:normal; widows:2; word=
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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple" style=3D"text-justify-t=
rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi, Lin=
da,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
for re-wording. I will incorporate some of the suggested changes in the fin=
al charter. Specifically, the below sentence means that a VNF appears to ou=
tside entity such as service control entity
 a normal, single VNF (instance), although internally there is a pool for h=
igh reliability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=A1=B0A VNF Pool-enabled VNF st=
ill appears as a normal VNF when orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.=A1=B1</span><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">We do h=
ave a dedicated paragraph about relation between VNFPool and SFC =A8C it is=
 the last paragraph of the main text, just above the milestone part. In tha=
t paragraph, we don=A1=AFt emphasize much on how
 VNFPool and SFC are different (as they are different in nature), but descr=
ibe how they relate and work with each other.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">-Ning<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
yle=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=B7=A2=BC=FE=C8=CB<span l=
ang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-size:10=
.0pt;font-family:=CB=CE=CC=E5"> Linda Dunbar
<br>
</span><b><span style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=B7=A2=
=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-=
US" style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5"> 2014</span><span s=
tyle=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=C4=EA<span lang=3D"EN-U=
S">6</span>=D4=C2<span lang=3D"EN-US">5</span>=C8=D5<span lang=3D"EN-US">
 4:13<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Zongning; vnfpool@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> RE: new VNFPool draft charter<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Ning,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">I made some wording changes to the proposed charter. The attached=
 Word document has the changes mark, making it easier to see. In case the m=
ailing list doesn=A1=AFt allow attachment,
 here is the proposed changes. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Should we also add a paragraph to show why/how VNFpool is differe=
nt from SFC?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Linda<o:p></o:p></span></p>
<div style=3D"border:none;border-bottom:solid windowtext 1.0pt;padding:0cm =
0cm 1.0pt 0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be instantiated to build network services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to achieve higher reli=
ability, a pool of VNFs that perform the same function can be grouped toget=
her for the network services.&nbsp;
</span><span lang=3D"DE">Conceptionally, multiple instances of a same funct=
ion are grouped together and managed by its Pool Manager. Different functio=
ns have different pool manager.&nbsp; A
</span><span lang=3D"EN-US">Pool Manager is responsible for monitoring&nbsp=
; the status of the instances in the pool, selecting active/standby instanc=
es for specific services, and potentially interacts with other entities, e.=
g. service control entity or&nbsp; service orchestration
 system. The major benefit of using VNF Pool is that reliability mechanisms=
 such as redundancy &amp; protection are achieved by the VNF Pool and thus =
not visible to the service control entity.
<a style=3D"mso-comment-reference:L_1;mso-comment-date:20140605T0908">A VNF=
 Pool-enabled VNF still appears as a normal VNF when orchestrated by
</a></span><span style=3D"mso-comment-continuation:1"><span lang=3D"DE">a <=
/span><span lang=3D"EN-US">service control entity.</span></span><span class=
=3D"MsoCommentReference"><span lang=3D"EN-US" style=3D"font-size:10.0pt;fon=
t-family:&quot;Calibri&quot;,&quot;sans-serif&quot;"><![if !supportAnnotati=
ons]><a class=3D"msocomanchor" id=3D"_anchor_1" onmouseover=3D"msoCommentSh=
ow('_anchor_1','_com_1')" onmouseout=3D"msoCommentHide('_com_1')" href=3D"#=
_msocom_1" language=3D"JavaScript" name=3D"_msoanchor_1">[L1]</a><![endif]>=
&nbsp;</span></span><span class=3D"MsoCommentReference"><span lang=3D"EN-US=
" style=3D"font-size:8.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;">&nbsp;</span></span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">When a live VNF instanc=
e goes out of service, how does the service control entity learn which inst=
ance in a VNF Pool will replace it, and learn the characteristics of the ne=
w instance?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms might include state=
 maintenance of instances in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains identical VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-bottom:solid windowtext 1.0pt;padding:0cm =
0cm 1.0pt 0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a=
>]
<b>On Behalf Of </b>Zongning<br>
<b>Sent:</b> Tuesday, June 03, 2014 4:36 AM<br>
<b>To:</b> <a href=3D"mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
<b>Subject:</b> [vnfpool] new VNFPool draft charter<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We narrow down our scop=
e to only focus on the redundancy model and the related interfaces associat=
ed with the VNF Pool in a single VNF.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Service state synchroni=
zation between VNF instances is out-of-scope. We may consider how to mainta=
in the pool states in a VNF Pool only for pooling purpose.<o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We assume that a VNF Po=
ol contains redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We do not address relia=
bility related control or routing between adjacent VNFs in the service grap=
h. This is also applied to update the relation between VNF Pool and SFC WG.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a =A1=B0VNF Pool=A1=B1.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">When a live VNF instanc=
e goes out of service, how does the service control entity learn which inst=
ance in a VNF Pool will replace it, and learn the characteristics of the ne=
w instance?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains redundant VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Redundancy management w=
ithin a VNF Pool, such as the signaling between the Pool Manager and the in=
stances in the pool for instance registration, backup instances selection, =
and switching between active and standby
 instances.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between th=
e Pool Manager and the underlying network to collect the network informatio=
n required for appropriate placement/selection of backup instances.<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between a =
VNF and the service control entity to exchange operational information betw=
een a VNF Pool</span><span lang=3D"DE"> and the service control entity.</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Identify and analyze re=
liable transport protocols, such as MPTCP and SCTP for reliable delivery of=
 the messages associated with the redundancy management within a VNF Pool.<=
o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Analysis of pooling sec=
urity characteristics and requirements to identify and mitigate threats aga=
inst the pooling mechanism. Identification of an appropriate trust model be=
tween pool members, and between pool
 members and Pool Manager.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"color:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Information exchanged between the =
VNF Pool and the SFC may include some
 operational information from the VNF Pool including the pool address, pool=
 instance characteristic, and so on, as requested by the SFC WG.<o:p></o:p>=
</span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning<o:p></o:p></span></p>
</div>
<div style=3D"mso-element:comment-list"><![if !supportAnnotations]>
<hr class=3D"msocomoff" align=3D"left" size=3D"1" width=3D"33%">
<![endif]>
<div style=3D"mso-element:comment"><![if !supportAnnotations]>
<div id=3D"_com_1" class=3D"msocomtxt" language=3D"JavaScript" onmouseover=
=3D"msoCommentShow('_anchor_1','_com_1')" onmouseout=3D"msoCommentHide('_co=
m_1')">
<![endif]><span style=3D"mso-comment-author:L73504"><![if !supportAnnotatio=
ns]><a name=3D"_msocom_1"></a><![endif]></span>
<p class=3D"MsoCommentText"><span class=3D"MsoCommentReference"><span lang=
=3D"EN-US" style=3D"font-size:8.0pt;font-family:&quot;Calibri&quot;,&quot;s=
ans-serif&quot;">&nbsp;</span></span><span lang=3D"EN-US">Not clear of the =
intent.
<o:p></o:p></span></p>
<p class=3D"MsoCommentText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoCommentText"><span lang=3D"EN-US">Do you mean: =A1=B0VNF ins=
tances in the VNF pool are still visible by the service control entity=A1=
=B1?
<o:p></o:p></span></p>
<![if !supportAnnotations]></div>
<![endif]></div>
</div>
</body>
</html>

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Ning:

=20

This charter is really good.  The focus to a Pool for single VNF of a =
single
type is a great place to start.  Once we get a working situation we can =
go
out to important issues like state synchronization.  Like Diego, I agree =
we
should place the state synchronization =93out of scope for this =
phase=94.=20

=20

Sue Hares

=20

From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Diego R. =
Lopez
Sent: Tuesday, June 03, 2014 6:23 PM
To: Zongning
Cc: vnfpool@ietf.org
Subject: Re: [vnfpool] new VNFPool draft charter

=20

Hi,=20

=20

It looks really good to me, Ning!

=20

I am just wondering whether we could give state synchronization a =
special
category (of being "out of scope in this phase" or similar) because I =
think
it is a extremely relevant issue.

=20

Be goode,

=20

On 3 Jun 2014, at 11:35 , Zongning <zongning@huawei.com> wrote:





Hi, folks,

=20

Please see the below new draft charter of VNFPool. We believe that we =
have
updated the charter to address most of the comments from London BoF. =
Main
changes are:

1)       We narrow down our scope to only focus on the redundancy model =
and
the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is
out-of-scope. We may consider how to maintain the pool states in a VNF =
Pool
only for pooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of =
same
functional type. Different types of VNFs are envisoned to be held in
separate VNF Pools.

4)       We do not address reliability related control or routing =
between
adjacent VNFs in the service graph. This is also applied to update the
relation between VNF Pool and SFC WG.

=20

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Network functions such as firewalls, load balancers, and WAN optimizers =
are
conventionally deployed as specialized hardware servers in both network
operators' networks and data center networks as the building blocks of =
the
network services. There is a trend to implement such network functions =
as
software instances running on general purpose servers, via a =
virtualization
layer (i.e., hypervisors). These virtualized functions are called
Virtualized Network Functions (VNFs), which can be used to build network
services.

=20

The use of VNFs introduces additional challenges to the reliability of =
the
provided network services. A single VNF instance would typically not =
have
built-in reliability mechanisms on its host (i.e., a general purpose
server). Instead, there are more factors of risk such as software =
failure at
various levels including hypervisors and virtual machines, hardware =
failure,
and instance migration that can make a VNF instance unreliable.

=20

In order to provide a reliable function, a VNF may adopt a pooling =
mechanism
by using a number of VNF instances providing the same function, which we
call a =93VNF Pool=94. Conceptionally, a Pool Manager is used to manage =
the VNF
Pool, e.g., selects active/standby VNF instances, and potentially =
interacts
with a service control entity. Such a service control entity is an =
entity
that orchestrates a set of network functions to build network services. =
The
major benefit of using VNF Pool is that reliability mechanisms such as
redundancy model are achieved by the VNF Pool inside the VNF and thus =
not
visible to the service control entity. A VNF Pool-enabled VNF still =
appears
as a normal VNF when orchestrated by a service control entity.

=20

Questions that are raised by the addition of a pooling mechanism to VNF
include:

=B7           How to manage the redundancy model, e.g., select =
active/standby
VNF instances in a VNF Pool?

=B7           What pool states need to be maintained to support the =
pooling
mechanism itself, and how are such states maintained?

=B7           What information is exchanged between a VNF and a service
control entity? For example, how can a VNF Pool be addressed by the =
service
control entity?

=B7           When a live VNF instance goes out of service, how does the
service control entity learn which instance in a VNF Pool will replace =
it,
and learn the characteristics of the new instance?

The WG initially focuses on several reliability mechanisms that are =
mainly
associated with a redundancy model based on a VNF Pool in a VNF. =
Additional
mechanisms that may be needed include state maintenance in a VNF Pool =
only
for pooling purpose (service state synchronization is out of scope). The =
WG
assumes that a VNF Pool contains redundant VNF instances of same =
functional
type. Different types of VNFs are envisoned to be held in separate VNF
Pools. The WG will address the reliability of an individual VNF, but not =
the
reliability related to the control or the routing between adjacent VNFs =
that
can form a network service.

Specifically, the WG will work on the following technical aspects:

=B7           Redundancy management within a VNF Pool, such as the =
signaling
between the Pool Manager and the instances in the pool for instance
registration, backup instances selection, and switching between active =
and
standby instances.

=B7           The protocol between the Pool Manager and the underlying =
network
to collect the network information required for appropriate
placement/selection of backup instances.

=B7           The protocol between a VNF and the service control entity =
to
exchange operational information between a VNF Pool and the service =
control
entity.

=B7           Identify and analyze reliable transport protocols, such as =
MPTCP
and SCTP for reliable delivery of the messages associated with the
redundancy management within a VNF Pool.

=B7           Analysis of pooling security characteristics and =
requirements to
identify and mitigate threats against the pooling mechanism. =
Identification
of an appropriate trust model between pool members, and between pool =
members
and Pool Manager.

The WG plans to deliver a problem statement, a set of use cases, VNF =
Pool
requirements and an architecture covering the aforementioned technical
aspects, and applicability and gap analysis of existing technologies =
such as
RSerPool. It is our expectation that we will be able to rely heavily on
existing IETF technologies, but that gaps will be found around problems =
like
redundancy mechanisms, state maintenance solely for pooling purposes,
reliable transport, and trust/security, all of which will need to be
considered and addressed. The WG will include consideration of the
manageability of a VNF Pool. The WG will seek re-chartering before =
adopting
any work to develop new, or extend existing, protocols.

=20

In particular, we will work closely with the SFC WG, as we believe that =
SFC
and VNF Pool are independent but complementary. SFC would essentially =
see a
VNF Pool-enabled VNF as a normal service function and therefore be able =
to
merge it into an SFC just like any other service functions. Information
exchanged between the VNF Pool and the SFC may include some operational
information from the VNF Pool including the pool address, pool instance
characteristic, and so on, as requested by the SFC WG.

=20

Goals and Milestones:

December 2014 - Submit VNFPool Problem Statement to IESG for publication =
as
Informational

April 2015 - Submit VNFPool Use Cases to IESG for publication as
Informational

August 2015 - Submit VNFPool Requirements, including the manageability =
of
VNF Pool to IESG for publication as Informational

August 2015 - Submit VNFPool Architecture to IESG for publication as
Proposed Standard

December 2015 - Submit Applicability and Gap Analysis of RSerPool to =
IESG
for publication as Informational

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

=20

Your comments and suggestions to the charter text are highly =
appreciated!

=20

Thanks.

=20

-Ning

_______________________________________________
vnfpool mailing list
 <mailto:vnfpool@ietf.org> vnfpool@ietf.org
 <https://www.ietf.org/mailman/listinfo/vnfpool>
https://www.ietf.org/mailman/listinfo/vnfpool

=20


--
"Esta vez no fallaremos, Doctor Infierno"

Dr Diego R. Lopez
Telefonica I+D

http://people.tid.es/diego.lopez/

e-mail: diego@tid.es
Tel:    +34 913 129 041
Mobile: +34 682 051 091
-----------------------------------------

=20

=20

  _____ =20


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D'>Ning:<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>This charter is really good.=A0 The focus to a Pool for single VNF of =
a single type is a great place to start.=A0 Once we get a working =
situation we can go out to important issues like state synchronization. =
=A0Like Diego, I agree we should place the state synchronization =
&#8220;out of scope for this phase&#8221;. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Sue Hares<o:p></o:p></span></p><p class=3DMsoNormal><span =
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D'><o:p>&nbsp;</o:p></span></p><div><div =
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0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
vnfpool [mailto:vnfpool-bounces@ietf.org] <b>On Behalf Of </b>Diego R. =
Lopez<br><b>Sent:</b> Tuesday, June 03, 2014 6:23 PM<br><b>To:</b> =
Zongning<br><b>Cc:</b> vnfpool@ietf.org<br><b>Subject:</b> Re: [vnfpool] =
new VNFPool draft charter<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Hi, =
<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>It looks really good to me, =
Ning!<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
am just wondering whether we could give state synchronization a special =
category (of being &quot;out of scope in this phase&quot; or similar) =
because I think it is a extremely relevant =
issue.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Be goode,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
3 Jun 2014, at 11:35 , Zongning &lt;<a =
href=3D"mailto:zongning@huawei.com">zongning@huawei.com</a>&gt; =
wrote:<o:p></o:p></p></div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><div><div><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Hi, folks,<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Please see the below new draft charter of VNFPool. We =
believe that we have updated the charter to address most of the comments =
from London BoF. Main changes are:<o:p></o:p></span></p><div =
style=3D'margin-left:.25in'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.25in'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>1)</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>We narrow down our scope to only focus on the redundancy =
model and the related interfaces associated with the VNF Pool in a =
single VNF.<o:p></o:p></span></p></div><div =
style=3D'margin-left:.25in'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.25in'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>2)</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Service state synchronization between VNF instances is =
out-of-scope. We may consider how to maintain the pool states in a VNF =
Pool only for pooling purpose.<o:p></o:p></span></p></div><div =
style=3D'margin-left:.25in'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.25in'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>3)</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>We assume that a VNF Pool contains redundant VNF =
instances of same functional type.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Different types of VNFs are envisoned to be held in =
separate VNF Pools.</span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'><o:p></o:p></span></p></div><div =
style=3D'margin-left:.25in'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.25in'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>4)</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>We do not address reliability related control or routing =
between adjacent VNFs in the service graph. This is also applied to =
update the relation between VNF Pool and SFC =
WG.<o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Network functions such as firewalls, load balancers, and =
WAN optimizers are conventionally deployed as specialized hardware =
servers in both network operators' networks and data center networks as =
the building blocks of the network services. There is a trend to =
implement such network functions as software instances running on =
general purpose servers, via a virtualization layer (i.e., hypervisors). =
These virtualized functions are called Virtualized Network Functions =
(VNFs), which can be used to build network =
services.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The use of VNFs introduces additional challenges to the =
reliability of the provided network services. A single VNF instance =
would typically not have built-in reliability mechanisms on its host =
(i.e., a general purpose server). Instead, there are more factors of =
risk such as software failure at various levels including hypervisors =
and virtual machines, hardware failure, and instance migration that can =
make a VNF instance unreliable.<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>In order to provide<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>a<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>reliable function, a VNF may adopt a pooling mechanism =
by using a number of VNF instances providing the same function, which we =
call a &#8220;VNF Pool&#8221;.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Conceptionally, a<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Pool Manager is used to manage the VNF Pool, e.g., =
selects active/standby VNF instances, and potentially interacts with a =
service control entity.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Such a<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>service control entity is an entity that orchestrates a =
set of network functions to build network services. The major benefit of =
using VNF Pool is that reliability mechanisms such as redundancy model =
are achieved by the VNF Pool inside the VNF and thus not visible to the =
service control entity. A VNF Pool-enabled VNF still appears as a normal =
VNF when orchestrated by<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>a<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>service control entity.<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Questions that are raised by the addition of a pooling =
mechanism to VNF include:<o:p></o:p></span></p><div =
style=3D'margin-left:24.6pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.05in;line-height:15.75pt'><span=
 =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>How to manage the redundancy model, e.g., select =
active/standby VNF instances in a VNF =
Pool?<o:p></o:p></span></p></div><div style=3D'margin-left:24.6pt'><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.05in;line-height:15.75pt'><span=
 =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>What pool states need to be maintained to support the =
pooling mechanism itself, and how are such states =
maintained?<o:p></o:p></span></p></div><div =
style=3D'margin-left:24.6pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.05in;line-height:15.75pt'><span=
 =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>What information is exchanged between a VNF and a =
service control entity? For example, how can a VNF Pool be addressed by =
the service control entity?<o:p></o:p></span></p></div><div =
style=3D'margin-left:24.6pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-.05in;line-height:15.75pt'><span=
 =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>When a live VNF instance goes out of service, how does =
the service control entity learn which instance in a VNF Pool will =
replace it, and learn the characteristics of the new =
instance?<o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The WG initially focuses on several reliability =
mechanisms that are mainly associated with a redundancy model based on a =
VNF Pool in a VNF. Additional mechanisms that may be needed include =
state maintenance in a VNF Pool</span><span =
class=3Dapple-converted-space><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>only for pooling purpose (service state synchronization =
is out of scope). The WG</span><span class=3Dapple-converted-space><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>assume</span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>s</span><span class=3Dapple-converted-space><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>that a VNF Pool contains redundant VNF instances of same =
functional type.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Different types of VNFs are envisoned to be held in =
separate VNF Pools.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The WG will address the reliability of an individual =
VNF</span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>, but not the</span><span =
class=3Dapple-converted-space><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>reliability related to the control or the routing =
between adjacent VNFs<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>that can form a network service</span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Specifically, the WG will work on the following =
technical aspects:<o:p></o:p></span></p><div =
style=3D'margin-left:38.85pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-21.0pt;line-height:15.75pt'><spa=
n =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Redundancy management within a VNF Pool, such as the =
signaling between the Pool Manager and the instances in the pool for =
instance registration, backup instances selection, and switching between =
active and standby instances.<o:p></o:p></span></p></div><div =
style=3D'margin-left:38.85pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-21.0pt;line-height:15.75pt'><spa=
n =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The protocol between the Pool Manager and the underlying =
network to collect the network information required for appropriate =
placement/selection of backup instances.<o:p></o:p></span></p></div><div =
style=3D'margin-left:38.85pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-21.0pt;line-height:15.75pt'><spa=
n =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The protocol between a VNF and the service control =
entity to exchange operational information between a VNF =
Pool</span><span class=3Dapple-converted-space><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>and the service control entity.</span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'><o:p></o:p></span></p></div><div =
style=3D'margin-left:38.85pt'><p class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-21.0pt;line-height:15.75pt'><spa=
n =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Identify and analyze reliable transport protocols, such =
as MPTCP and SCTP for reliable delivery of the messages associated with =
the redundancy management within a VNF =
Pool.<o:p></o:p></span></p></div><div style=3D'margin-left:38.85pt'><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-indent:-21.0pt;line-height:15.75pt'><spa=
n =
style=3D'font-size:10.5pt;font-family:Symbol;mso-fareast-language:ZH-CN'>=
=B7</span><span =
style=3D'font-size:7.0pt;mso-fareast-language:ZH-CN'>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Analysis of pooling security characteristics and =
requirements to identify and mitigate threats against the pooling =
mechanism. Identification of an appropriate trust model between pool =
members, and between pool members and Pool =
Manager.<o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>The WG plans to deliver a problem statement, a set of =
use cases, VNF Pool requirements and an architecture covering the =
aforementioned technical aspects, and applicability and gap analysis of =
existing technologies such as RSerPool. It is our expectation that we =
will be able to rely heavily on existing IETF technologies, but that =
gaps will be found around problems like redundancy mechanisms, state =
maintenance</span><span class=3Dapple-converted-space><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;</span></span><span lang=3DDE =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>solely for pooling purposes</span><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>, reliable transport, and trust/security, all of which =
will need to be considered and addressed. The WG will include =
consideration of the manageability of a VNF Pool. The WG will seek =
re-chartering before adopting any work to develop new, or extend =
existing, protocols.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>In particular, we will work closely with the SFC WG, as =
we believe that SFC and VNF Pool are independent but complementary.<span =
class=3Dapple-converted-space>&nbsp;</span>SFC would essentially see a =
VNF Pool-enabled VNF as a normal service function and therefore be able =
to merge it into an SFC just like any other service functions. =
Information exchanged between the VNF Pool and the SFC may include some =
operational information from the VNF Pool including the pool address, =
pool instance characteristic, and so on, as requested by the SFC =
WG.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Goals and Milestones:<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>December 2014 - Submit VNFPool Problem Statement to IESG =
for publication as Informational<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>April 2015 - Submit VNFPool Use Cases to IESG for =
publication as Informational<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>August 2015 - Submit VNFPool Requirements, including the =
manageability of VNF Pool to IESG for publication as =
Informational<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>August 2015 - Submit VNFPool Architecture to IESG for =
publication as Proposed Standard<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>December 2015 - Submit Applicability and Gap Analysis of =
RSerPool to IESG for publication as =
Informational<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Your comments and suggestions to the charter text are =
highly appreciated!<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>Thanks.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";mso-fareast-=
language:ZH-CN'>-Ning<o:p></o:p></span></p></div><p =
class=3DMsoNormal><span =
style=3D'font-size:8.5pt;font-family:"LucidaGrande","serif";mso-fareast-l=
anguage:ZH-CN'>_______________________________________________<br>vnfpool=
 mailing list<br><a href=3D"mailto:vnfpool@ietf.org"><span =
style=3D'color:purple'>vnfpool@ietf.org</span></a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/vnfpool"><span =
style=3D'color:purple'>https://www.ietf.org/mailman/listinfo/vnfpool</spa=
n></a><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif";color:black'><br>--<br>&quo=
t;Esta vez no fallaremos, Doctor Infierno&quot;<br><br>Dr Diego R. =
Lopez<br>Telefonica I+D<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Helvetica","sans-serif";color:black'><a =
href=3D"http://people.tid.es/diego.lopez/">http://people.tid.es/diego.lop=
ez/</a><br><br>e-mail: <a =
href=3D"mailto:diego@tid.es">diego@tid.es</a><br>Tel: &nbsp; &nbsp;+34 =
913 129 041<br>Mobile: +34 682 051 =
091<br>-----------------------------------------<o:p></o:p></span></p></d=
iv></div></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div class=3DMsoNormal =
align=3Dcenter style=3D'text-align:center'><hr size=3D2 width=3D"100%" =
align=3Dcenter></div><p class=3DMsoNormal><span =
style=3D'font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'><br=
>Este mensaje se dirige exclusivamente a su destinatario. Puede =
consultar nuestra pol=EDtica de env=EDo y recepci=F3n de correo =
electr=F3nico en el enlace situado m=E1s abajo.<br>This message is =
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href=3D"http://www.tid.es/ES/PAGINAS/disclaimer.aspx">http://www.tid.es/E=
S/PAGINAS/disclaimer.aspx</a></span><o:p></o:p></p></div></body></html>
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From nobody Thu Jun  5 13:44:39 2014
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Melinda:

If we leave it scope for this phase,  but open for some future phase I think
it will help the discussion.  This will allows to build toward this phase.
Of course, I'm coming from the router/SDN platform view point. 

Sue 

-----Original Message-----
From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Melinda Shore
Sent: Tuesday, June 03, 2014 6:36 PM
To: vnfpool@ietf.org
Subject: Re: [vnfpool] new VNFPool draft charter

On 6/3/14 2:23 PM, Diego R. Lopez wrote:
> Hi,
> 
> It looks really good to me, Ning!
> 
> I am just wondering whether we could give state synchronization a 
> special category (of being "out of scope in this phase" or similar) 
> because I think it is a extremely relevant issue.

This is an extremely contested question.  It seems appropriate to me to view
vnfpool as a layered mechanism, where a layer handling the
reliability/redundancy mechanism may carry other traffic, but that traffic
is opaque to the pooling mechanism.  That traffic might include service
state.  But, this is my second go-'round on state transfer (third, if you
include sami, the first one being rserpool
itself) and I really think it's best to be left out of scope with no
specific future plans for the time being, but to allow a generic transport
mechanism in the pooling traffic.

Melinda


--
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."

_______________________________________________
vnfpool mailing list
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Linda and Ning. 

 

My understanding from this charter is that the pool would be transparent to
whatever entity used it. 

 

If it was a pool of firewalls, then the VNF would be a firewall. It would be
hidden to SFC or SDN controller wanting to use the firewall that it was part
of a pool. 

 

This comes from section 4 in the problem statement that states: 

"The main benefit of using VNF Pool is the pooling mechanism such as
redundancy management are achieved by the VNF Pool inside the VNF and
transparent to the Service Control Entity.  The Service control Entity
simply interacts with the Pool Manager in each VNF to request and
orchestrate the network functions with desired reliability level."

 

To me, in my past work this was important to make the overall process work
simply.   Is this the source of your astute question? 

 

Sue 

 

 

From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Linda Dunbar
Sent: Wednesday, June 04, 2014 4:13 PM
To: Zongning; vnfpool@ietf.org
Subject: Re: [vnfpool] new VNFPool draft charter

 

Ning, 

 

I made some wording changes to the proposed charter. The attached Word
document has the changes mark, making it easier to see. In case the mailing
list doesn't allow attachment, here is the proposed changes. 

 

Should we also add a paragraph to show why/how VNFpool is different from
SFC? 

 

Linda

 

 

Network functions such as firewalls, load balancers, and WAN optimizers are
conventionally deployed as specialized hardware servers in both network
operators' networks and data center networks as the building blocks of the
network services. There is a trend to implement such network functions as
software instances running on general purpose servers, via a virtualization
layer (i.e., hypervisors). These virtualized functions are called
Virtualized Network Functions (VNFs), which can be instantiated to build
network services.

 

The use of VNFs introduces additional challenges to the reliability of the
provided network services. A single VNF instance would typically not have
built-in reliability mechanisms on its host (i.e., a general purpose
server). Instead, there are more factors of risk such as software failure at
various levels including hypervisors and virtual machines, hardware failure,
and instance migration that can make a VNF instance unreliable.

 

In order to achieve higher reliability, a pool of VNFs that perform the same
function can be grouped together for the network services.  Conceptionally,
multiple instances of a same function are grouped together and managed by
its Pool Manager. Different functions have different pool manager.  A Pool
Manager is responsible for monitoring  the status of the instances in the
pool, selecting active/standby instances for specific services, and
potentially interacts with other entities, e.g. service control entity or
service orchestration system. The major benefit of using VNF Pool is that
reliability mechanisms such as redundancy & protection are achieved by the
VNF Pool and thus not visible to the service control entity. A VNF
Pool-enabled VNF still appears as a normal VNF when orchestrated by a
service control entity.[L1] <>   

 

Questions that are raised by the addition of a pooling mechanism to VNF
include:

.       How to manage the redundancy model, e.g., select active/standby VNF
instances in a VNF Pool?

.       What pool states need to be maintained to support the pooling
mechanism itself, and how are such states maintained?

.       What information is exchanged between a VNF and a service control
entity? For example, how can a VNF Pool be addressed by the service control
entity?

.       When a live VNF instance goes out of service, how does the service
control entity learn which instance in a VNF Pool will replace it, and learn
the characteristics of the new instance?

The WG initially focuses on several reliability mechanisms that are mainly
associated with a redundancy model based on a VNF Pool in a VNF. Additional
mechanisms might include state maintenance of instances in a VNF Pool only
for pooling purpose (service state synchronization is out of scope). The WG
assumes that a VNF Pool contains identical VNF instances of same functional
type. Different types of VNFs are envisoned to be held in separate VNF
Pools. The WG will address the reliability of an individual VNF, but not the
reliability related to the control or the routing between adjacent VNFs that
can form a network service.

 

 

 

 

 

From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Zongning
Sent: Tuesday, June 03, 2014 4:36 AM
To: vnfpool@ietf.org
Subject: [vnfpool] new VNFPool draft charter

 

Hi, folks,

 

Please see the below new draft charter of VNFPool. We believe that we have
updated the charter to address most of the comments from London BoF. Main
changes are:

1)       We narrow down our scope to only focus on the redundancy model and
the related interfaces associated with the VNF Pool in a single VNF.

2)       Service state synchronization between VNF instances is
out-of-scope. We may consider how to maintain the pool states in a VNF Pool
only for pooling purpose.

3)       We assume that a VNF Pool contains redundant VNF instances of same
functional type. Different types of VNFs are envisoned to be held in
separate VNF Pools.

4)       We do not address reliability related control or routing between
adjacent VNFs in the service graph. This is also applied to update the
relation between VNF Pool and SFC WG.

 

==========================================================================

Network functions such as firewalls, load balancers, and WAN optimizers are
conventionally deployed as specialized hardware servers in both network
operators' networks and data center networks as the building blocks of the
network services. There is a trend to implement such network functions as
software instances running on general purpose servers, via a virtualization
layer (i.e., hypervisors). These virtualized functions are called
Virtualized Network Functions (VNFs), which can be used to build network
services.

 

The use of VNFs introduces additional challenges to the reliability of the
provided network services. A single VNF instance would typically not have
built-in reliability mechanisms on its host (i.e., a general purpose
server). Instead, there are more factors of risk such as software failure at
various levels including hypervisors and virtual machines, hardware failure,
and instance migration that can make a VNF instance unreliable.

 

In order to provide a reliable function, a VNF may adopt a pooling mechanism
by using a number of VNF instances providing the same function, which we
call a "VNF Pool". Conceptionally, a Pool Manager is used to manage the VNF
Pool, e.g., selects active/standby VNF instances, and potentially interacts
with a service control entity. Such a service control entity is an entity
that orchestrates a set of network functions to build network services. The
major benefit of using VNF Pool is that reliability mechanisms such as
redundancy model are achieved by the VNF Pool inside the VNF and thus not
visible to the service control entity. A VNF Pool-enabled VNF still appears
as a normal VNF when orchestrated by a service control entity.

 

Questions that are raised by the addition of a pooling mechanism to VNF
include:

.       How to manage the redundancy model, e.g., select active/standby VNF
instances in a VNF Pool?

.       What pool states need to be maintained to support the pooling
mechanism itself, and how are such states maintained?

.       What information is exchanged between a VNF and a service control
entity? For example, how can a VNF Pool be addressed by the service control
entity?

.       When a live VNF instance goes out of service, how does the service
control entity learn which instance in a VNF Pool will replace it, and learn
the characteristics of the new instance?

The WG initially focuses on several reliability mechanisms that are mainly
associated with a redundancy model based on a VNF Pool in a VNF. Additional
mechanisms that may be needed include state maintenance in a VNF Pool only
for pooling purpose (service state synchronization is out of scope). The WG
assumes that a VNF Pool contains redundant VNF instances of same functional
type. Different types of VNFs are envisoned to be held in separate VNF
Pools. The WG will address the reliability of an individual VNF, but not the
reliability related to the control or the routing between adjacent VNFs that
can form a network service.

Specifically, the WG will work on the following technical aspects:

.           Redundancy management within a VNF Pool, such as the signaling
between the Pool Manager and the instances in the pool for instance
registration, backup instances selection, and switching between active and
standby instances.

.           The protocol between the Pool Manager and the underlying network
to collect the network information required for appropriate
placement/selection of backup instances.

.           The protocol between a VNF and the service control entity to
exchange operational information between a VNF Pool and the service control
entity.

.           Identify and analyze reliable transport protocols, such as MPTCP
and SCTP for reliable delivery of the messages associated with the
redundancy management within a VNF Pool.

.           Analysis of pooling security characteristics and requirements to
identify and mitigate threats against the pooling mechanism. Identification
of an appropriate trust model between pool members, and between pool members
and Pool Manager.

The WG plans to deliver a problem statement, a set of use cases, VNF Pool
requirements and an architecture covering the aforementioned technical
aspects, and applicability and gap analysis of existing technologies such as
RSerPool. It is our expectation that we will be able to rely heavily on
existing IETF technologies, but that gaps will be found around problems like
redundancy mechanisms, state maintenance solely for pooling purposes,
reliable transport, and trust/security, all of which will need to be
considered and addressed. The WG will include consideration of the
manageability of a VNF Pool. The WG will seek re-chartering before adopting
any work to develop new, or extend existing, protocols.

 

In particular, we will work closely with the SFC WG, as we believe that SFC
and VNF Pool are independent but complementary. SFC would essentially see a
VNF Pool-enabled VNF as a normal service function and therefore be able to
merge it into an SFC just like any other service functions. Information
exchanged between the VNF Pool and the SFC may include some operational
information from the VNF Pool including the pool address, pool instance
characteristic, and so on, as requested by the SFC WG.

 

Goals and Milestones:

December 2014 - Submit VNFPool Problem Statement to IESG for publication as
Informational

April 2015 - Submit VNFPool Use Cases to IESG for publication as
Informational

August 2015 - Submit VNFPool Requirements, including the manageability of
VNF Pool to IESG for publication as Informational

August 2015 - Submit VNFPool Architecture to IESG for publication as
Proposed Standard

December 2015 - Submit Applicability and Gap Analysis of RSerPool to IESG
for publication as Informational

==========================================================================

 

Your comments and suggestions to the charter text are highly appreciated!

 

Thanks.

 

-Ning

  _____  

 Not clear of the intent. 

 

Do you mean: "VNF instances in the VNF pool are still visible by the service
control entity"? 


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'>Linda and Ning. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>My =
understanding from this charter is that the pool would be transparent to =
whatever entity used it. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>If it =
was a pool of firewalls, then the VNF would be a firewall. It would be =
hidden to SFC or SDN controller wanting to use the firewall that it was =
part of a pool. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>This =
comes from section 4 in the problem statement that states: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'>&#8220;The main benefit of =
using VNF Pool is the pooling mechanism such as redundancy management =
are achieved by the VNF Pool inside the VNF and transparent to the =
Service Control Entity. &nbsp;The Service control Entity simply =
interacts with the Pool Manager in each VNF to request and orchestrate =
the network functions with desired reliability =
level.&#8221;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>To me, =
in my past work this was important to make the overall process work =
simply.&nbsp; &nbsp;Is this the source of your astute question? =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>Sue =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
vnfpool [mailto:vnfpool-bounces@ietf.org] <b>On Behalf Of </b>Linda =
Dunbar<br><b>Sent:</b> Wednesday, June 04, 2014 4:13 PM<br><b>To:</b> =
Zongning; vnfpool@ietf.org<br><b>Subject:</b> Re: [vnfpool] new VNFPool =
draft charter<o:p></o:p></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>Ning, =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>I made =
some wording changes to the proposed charter. The attached Word document =
has the changes mark, making it easier to see. In case the mailing list =
doesn&#8217;t allow attachment, here is the proposed changes. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>Should =
we also add a paragraph to show why/how VNFpool is different from SFC? =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'>Linda<o:p></o:p></span></p><div =
style=3D'border:none;border-bottom:solid windowtext 1.0pt;padding:0in =
0in 1.0pt 0in'><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p></di=
v><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal>Network functions such as firewalls, load balancers, =
and WAN optimizers are conventionally deployed as specialized hardware =
servers in both network operators' networks and data center networks as =
the building blocks of the network services. There is a trend to =
implement such network functions as software instances running on =
general purpose servers, via a virtualization layer (i.e., hypervisors). =
These virtualized functions are called Virtualized Network Functions =
(VNFs), which can be instantiated to build network =
services.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>The use of VNFs introduces additional challenges to =
the reliability of the provided network services. A single VNF instance =
would typically not have built-in reliability mechanisms on its host =
(i.e., a general purpose server). Instead, there are more factors of =
risk such as software failure at various levels including hypervisors =
and virtual machines, hardware failure, and instance migration that can =
make a VNF instance unreliable.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>In order to =
achieve higher reliability, a pool of VNFs that perform the same =
function can be grouped together for the network services.&nbsp; <span =
lang=3DDE>Conceptionally, multiple instances of a same function are =
grouped together and managed by its Pool Manager. Different functions =
have different pool manager.&nbsp; A </span>Pool Manager is responsible =
for monitoring&nbsp; the status of the instances in the pool, selecting =
active/standby instances for specific services, and potentially =
interacts with other entities, e.g. service control entity or&nbsp; =
service orchestration system. The major benefit of using VNF Pool is =
that reliability mechanisms such as redundancy &amp; protection are =
achieved by the VNF Pool and thus not visible to the service control =
entity. <a =
style=3D'mso-comment-reference:L_1;mso-comment-date:20140604T1509'>A VNF =
Pool-enabled VNF still appears as a normal VNF when orchestrated by =
</a><span style=3D'mso-comment-continuation:1'><span lang=3DDE>a =
</span>service control entity.</span><span =
class=3DMsoCommentReference><span =
style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif"'><![if =
!supportAnnotations]><a class=3Dmsocomanchor id=3D"_anchor_1" =
onmouseover=3D"msoCommentShow('_anchor_1','_com_1')" =
onmouseout=3D"msoCommentHide('_com_1')" href=3D"#_msocom_1" =
language=3DJavaScript =
name=3D"_msoanchor_1">[L1]</a><![endif]>&nbsp;</span></span><span =
class=3DMsoCommentReference><span =
style=3D'font-size:8.0pt;font-family:"Calibri","sans-serif"'>&nbsp;</span=
></span><o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Questions that are raised by the addition of a pooling =
mechanism to VNF include:<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
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style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>How to manage the redundancy model, e.g., =
select active/standby VNF instances in a VNF Pool?<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
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style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>What pool states need to be maintained to =
support the pooling mechanism itself, and how are such states =
maintained?<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>What information is exchanged between a =
VNF and a service control entity? For example, how can a VNF Pool be =
addressed by the service control entity?<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>When a live VNF instance goes out of =
service, how does the service control entity learn which instance in a =
VNF Pool will replace it, and learn the characteristics of the new =
instance?<o:p></o:p></p><p class=3DMsoNormal>The WG initially focuses on =
several reliability mechanisms that are mainly associated with a =
redundancy model based on a VNF Pool in a VNF. Additional mechanisms =
might include state maintenance of instances in a VNF Pool<span =
lang=3DDE> only for pooling purpose (service state synchronization is =
out of scope). The WG</span> assume<span lang=3DDE>s</span> that a VNF =
Pool contains identical VNF instances of same functional type. <span =
lang=3DDE>Different types of VNFs are envisoned to be held in separate =
VNF Pools. </span>The WG will address the reliability of an individual =
VNF<span lang=3DDE>, but not the</span> reliability related to the =
control or the routing between adjacent VNFs <span lang=3DDE>that can =
form a network service</span>.<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
 style=3D'border:none;border-bottom:solid windowtext 1.0pt;padding:0in =
0in 1.0pt 0in'><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p></di=
v><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org<=
/a>] <b>On Behalf Of </b>Zongning<br><b>Sent:</b> Tuesday, June 03, 2014 =
4:36 AM<br><b>To:</b> <a =
href=3D"mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br><b>Subject:</b> =
[vnfpool] new VNFPool draft charter<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Hi, =
folks,<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Please see the below new draft charter of VNFPool. We =
believe that we have updated the charter to address most of the comments =
from London BoF. Main changes are:<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>1)<span =
style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]>We =
narrow down our scope to only focus on the redundancy model and the =
related interfaces associated with the VNF Pool in a single =
VNF.<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>2)<span =
style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span><![endif]>Service state synchronization between VNF =
instances is out-of-scope. We may consider how to maintain the pool =
states in a VNF Pool only for pooling purpose.<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>3)<span =
style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]>We =
assume that a VNF Pool contains redundant VNF instances of same =
functional type. <span lang=3DDE>Different types of VNFs are envisoned =
to be held in separate VNF Pools.</span><o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>4)<span =
style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><![endif]>We =
do not address reliability related control or routing between adjacent =
VNFs in the service graph. This is also applied to update the relation =
between VNF Pool and SFC WG.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<o:p></o:p></p><p class=3DMsoNormal>Network functions =
such as firewalls, load balancers, and WAN optimizers are conventionally =
deployed as specialized hardware servers in both network operators' =
networks and data center networks as the building blocks of the network =
services. There is a trend to implement such network functions as =
software instances running on general purpose servers, via a =
virtualization layer (i.e., hypervisors). These virtualized functions =
are called Virtualized Network Functions (VNFs), which can be used to =
build network services.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>The use of =
VNFs introduces additional challenges to the reliability of the provided =
network services. A single VNF instance would typically not have =
built-in reliability mechanisms on its host (i.e., a general purpose =
server). Instead, there are more factors of risk such as software =
failure at various levels including hypervisors and virtual machines, =
hardware failure, and instance migration that can make a VNF instance =
unreliable.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>In order to provide <span lang=3DDE>a </span>reliable =
function, a VNF may adopt a pooling mechanism by using a number of VNF =
instances providing the same function, which we call a &#8220;VNF =
Pool&#8221;. <span lang=3DDE>Conceptionally, a </span>Pool Manager is =
used to manage the VNF Pool, e.g., selects active/standby VNF instances, =
and potentially interacts with a service control entity. <span =
lang=3DDE>Such a </span>service control entity is an entity that =
orchestrates a set of network functions to build network services. The =
major benefit of using VNF Pool is that reliability mechanisms such as =
redundancy model are achieved by the VNF Pool inside the VNF and thus =
not visible to the service control entity. A VNF Pool-enabled VNF still =
appears as a normal VNF when orchestrated by <span lang=3DDE>a =
</span>service control entity.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Questions =
that are raised by the addition of a pooling mechanism to VNF =
include:<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>How to manage the redundancy model, e.g., =
select active/standby VNF instances in a VNF Pool?<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>What pool states need to be maintained to =
support the pooling mechanism itself, and how are such states =
maintained?<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>What information is exchanged between a =
VNF and a service control entity? For example, how can a VNF Pool be =
addressed by the service control entity?<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2=
4.6pt;text-indent:-.05in;line-height:150%;mso-list:l2 level1 lfo2'><![if =
!supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>When a live VNF instance goes out of =
service, how does the service control entity learn which instance in a =
VNF Pool will replace it, and learn the characteristics of the new =
instance?<o:p></o:p></p><p class=3DMsoNormal>The WG initially focuses on =
several reliability mechanisms that are mainly associated with a =
redundancy model based on a VNF Pool in a VNF. Additional mechanisms =
that may be needed include state maintenance in a VNF Pool <span =
lang=3DDE>only for pooling purpose (service state synchronization is out =
of scope). The WG</span> assume<span lang=3DDE>s</span> that a VNF Pool =
contains redundant VNF instances of same functional type. <span =
lang=3DDE>Different types of VNFs are envisoned to be held in separate =
VNF Pools. </span>The WG will address the reliability of an individual =
VNF<span lang=3DDE>, but not the</span> reliability related to the =
control or the routing between adjacent VNFs <span lang=3DDE>that can =
form a network service</span>.<o:p></o:p></p><p =
class=3DMsoNormal>Specifically, the WG will work on the following =
technical aspects:<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
8.85pt;text-indent:-21.0pt;line-height:150%;mso-list:l0 level1 =
lfo6'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>Redundancy management within a VNF Pool, =
such as the signaling between the Pool Manager and the instances in the =
pool for instance registration, backup instances selection, and =
switching between active and standby instances.<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
8.85pt;text-indent:-21.0pt;line-height:150%;mso-list:l0 level1 =
lfo6'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>The protocol between the Pool Manager and =
the underlying network to collect the network information required for =
appropriate placement/selection of backup instances.<o:p></o:p></p><p =
class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
8.85pt;text-indent:-21.0pt;line-height:150%;mso-list:l0 level1 =
lfo6'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>The protocol between a VNF and the =
service control entity to exchange operational information between a VNF =
Pool<span lang=3DDE> and the service control =
entity.</span><o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
8.85pt;text-indent:-21.0pt;line-height:150%;mso-list:l0 level1 =
lfo6'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>Identify and analyze reliable transport =
protocols, such as MPTCP and SCTP for reliable delivery of the messages =
associated with the redundancy management within a VNF =
Pool.<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
8.85pt;text-indent:-21.0pt;line-height:150%;mso-list:l0 level1 =
lfo6'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]>Analysis of pooling security =
characteristics and requirements to identify and mitigate threats =
against the pooling mechanism. Identification of an appropriate trust =
model between pool members, and between pool members and Pool =
Manager.<o:p></o:p></p><p class=3DMsoNormal>The WG plans to deliver a =
problem statement, a set of use cases, VNF Pool requirements and an =
architecture covering the aforementioned technical aspects, and =
applicability and gap analysis of existing technologies such as =
RSerPool. It is our expectation that we will be able to rely heavily on =
existing IETF technologies, but that gaps will be found around problems =
like redundancy mechanisms, state maintenance<span lang=3DDE> solely for =
pooling purposes</span>, reliable transport, and trust/security, all of =
which will need to be considered and addressed. The WG will include =
consideration of the manageability of a VNF Pool. The WG will seek =
re-chartering before adopting any work to develop new, or extend =
existing, protocols.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>In =
particular, we will work closely with the SFC WG, as we believe that SFC =
and VNF Pool are independent but complementary. <span =
style=3D'color:black'>SFC would essentially see a VNF Pool-enabled VNF =
as a normal service function and therefore be able to merge it into an =
SFC just like any other service functions. Information exchanged between =
the VNF Pool and the SFC may include some operational information from =
the VNF Pool including the pool address, pool instance characteristic, =
and so on, as requested by the SFC WG.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Goals and =
Milestones:<o:p></o:p></p><p class=3DMsoNormal>December 2014 - Submit =
VNFPool Problem Statement to IESG for publication as =
Informational<o:p></o:p></p><p class=3DMsoNormal>April 2015 - Submit =
VNFPool Use Cases to IESG for publication as =
Informational<o:p></o:p></p><p class=3DMsoNormal>August 2015 - Submit =
VNFPool Requirements, including the manageability of VNF Pool to IESG =
for publication as Informational<o:p></o:p></p><p =
class=3DMsoNormal>August 2015 - Submit VNFPool Architecture to IESG for =
publication as Proposed Standard<o:p></o:p></p><p =
class=3DMsoNormal>December 2015 - Submit Applicability and Gap Analysis =
of RSerPool to IESG for publication as Informational<o:p></o:p></p><p =
class=3DMsoNormal>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Your =
comments and suggestions to the charter text are highly =
appreciated!<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>-Ning<o:p></o:p></p></div><div =
style=3D'mso-element:comment-list'><![if !supportAnnotations]><hr =
class=3Dmsocomoff align=3Dleft size=3D1 width=3D"33%"><![endif]><div =
style=3D'mso-element:comment'><![if !supportAnnotations]><div =
id=3D"_com_1" class=3Dmsocomtxt language=3DJavaScript =
onmouseover=3D"msoCommentShow('_anchor_1','_com_1')" =
onmouseout=3D"msoCommentHide('_com_1')"><![endif]><span =
style=3D'mso-comment-author:L73504'><![if !supportAnnotations]><a =
name=3D"_msocom_1"></a><![endif]></span><p class=3DMsoCommentText><span =
class=3DMsoCommentReference><span =
style=3D'font-size:8.0pt;font-family:"Calibri","sans-serif"'>&nbsp;</span=
></span>Not clear of the intent. <o:p></o:p></p><p =
class=3DMsoCommentText><o:p>&nbsp;</o:p></p><p class=3DMsoCommentText>Do =
you mean: &#8220;VNF instances in the VNF pool are still visible by the =
service control entity&#8221;? </p><![if =
!supportAnnotations]></div><![endif]></div></div></body></html>
------=_NextPart_000_011A_01CF80DF.60FAB860--



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Subject: Re: [vnfpool] new VNFPool draft charter
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On 6/5/14 12:44 PM, Susan Hares wrote:
> Melinda:
> 
> If we leave it scope for this phase,  but open for some future phase I think
> it will help the discussion.  This will allows to build toward this phase.
> Of course, I'm coming from the router/SDN platform view point. 

I think it will help among people who'd like to use it but
hurt us politically, to be frank - this is an issue that always
raises a lot of ire in the quarter of the IETF in which we're
now operating.  We'd also be faced with the difficult of answering
the question of why a vendor would want a customer to be able to fail,
say, their firewall over to another vendor's firewall.  The obvious
answer to that is that customers want it, but that doesn't mean
that vendors will implement that kind of mechanism, and when we've
done polls about this kind of thing we haven't been able to get
any vendor to say they'd do it.  So, if people really want to
include text saying that this is future work, by all means do so
but do so with knowledge of how discussions have gone in the very
recent past.

And to be clear, to say that it's out of scope means that it's out of
scope *now* - as we know all decisions may be revisited in the
future.

Melinda

-- 
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."


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From: "Susan Hares" <shares@ndzh.com>
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Subject: Re: [vnfpool] Version 05 of VNFPool Problem Statement
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Ning:

 

In looking at the diffs from -04 question, I delighted with at the clarity
of the restatement of much of the text.  

Kudos/Congratulations on the excellent job there.  I only hope I do as well
in the editing of documents. 

 

However one editorial issues: 

 

Section 5.6 

 

We do not work on other management aspects of the VNF such as scaling, or
load balancing, even though these aspects may be complementary to
reliability in order to provide network services. 

[I think you want to say .. Will do not plan to work on. ] 

 

On a few technical points, I'd like to opine

1.  Changes to Section 5.4 

 

5.4.  Interaction between VNF and Service Control Entity

 

   Some information needs to be exchanged between a VNF and the Service

   Control Entity when the Service Control Entity orchestrates a VNF

   Pool-enable VNF.  For example, how can a VNF Pool be addressed by the

   Service Control Entity?  A Pool Manager can advertise the locator

   (e.g., IP address) of the active instance - subject to dynamic due to

   failover.  It is also possible to use a virtual address for the whole

   VNF Pool (similar to RSerPool or VRRP), and map between virtual and

   actual addresses.  Moreover, when a live VNF instance goes out of

   service, how does the Service Control Entity learn which VNF instance

   will replace it, and learn the characteristic of the new instance?

 

[Sue's opine on] 

The addressing between the VNF and the Service Control entity is an
important part.  VRRP worked in the past for some of VNF/Service Control
Entity, but had failure points within servers with VMs, and 

Failures points across multiple servers with VMs. 

 

Are we allowing VNF pools to go across multiple servers in multiple
locations? 

Within a single machine with the right OS modifications, the VRRP has
simplicity

and a sub-second VRRP failover is possible. VRRP can expand to multiple
boxes,

and a subsecond failover is possible, but has additional requirements to 

instrument the sub-second failover between VMs. 

 

The point is . we should know from the past work with RSerPool and VRRP
where the issues with the can be.  The WG should be able to choose to:

a)  select existing protocols, 

b)  extend existing protocol, or 

c)  create new protocols. 

 

We should prefer a and b over c.  

[Sue opine off]

 

Is this what you are considering in this problem statement? If so, then your
draft really, really improves the clarity of the problem. 

 

Sue 

 

=====

 

By the way:  Opine -means to hold and state as one's opinion

 

From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Zongning
Sent: Monday, May 05, 2014 4:47 AM
To: vnfpool@ietf.org
Subject: [vnfpool] Version 05 of VNFPool Problem Statement

 

Hi,

 

A new revision -05 of VNFPool Problem Statement I-D is posted as below:

http://www.ietf.org/id/draft-zong-vnfpool-problem-statement-05.txt

 

Many thanks to Qiang, Marco, and Georgios for your comments on -04 version.
I mainly incorporated your suggestions, as well as further clarified VNFPool
scope and relation to SFC.

 

Main changes:

1)       Update definition of VNF set to clarify the relation to VNF pools;

2)       Focus VNFPool scope to internal VNF, and interface between VNF and
Service Control Entity, *not* communications between VNFs;

3)       Change 5.4 to "Interaction between VNF and Service Control Entity";

4)       Emphasize that we currently assume VNF pool contains the instances
of same functional type, *not* different VNF components;

5)       Update 6.3 about VNFPool relation to SFC;

 

Please folks continue reviewing the new version. Your comments are ALWAYS
welcome!

 

-Ning

 


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vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Ning:<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>In looking at the diffs from -04 question, I =
delighted with at the clarity of the restatement of much of the =
text.&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Kudos/Congratulations on the excellent job there. =
&nbsp;I only hope I do as well in the editing of documents. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>However one editorial issues: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Section 5.6 <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>We do not work on other management aspects of the =
VNF such as scaling, or load balancing, even though these aspects may be =
complementary to reliability in order to provide network services. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'>[I =
think you want to say .. Will do not plan to work on&#8230; ] =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>On a few technical points, I&#8217;d like to =
opine<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 =
lfo3'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'><span =
style=3D'mso-list:Ignore'>1.<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp; </span></span></span><![endif]><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Changes to Section 5.4 <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#222222;background:white'>&nbsp;<o:p></o:p></span></p><p =
class=3DMsoNormal align=3Dleft style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>5.4.&nbsp; =
Interaction between VNF and Service Control =
Entity<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; Some =
information needs to be exchanged between a VNF and the =
Service<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; =
Control Entity when the Service Control Entity orchestrates a =
VNF<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; =
Pool-enable VNF.&nbsp; For example, how can a VNF Pool be addressed by =
the<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; =
Service Control Entity?&nbsp; A Pool Manager can advertise the =
locator<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; (e.g., =
IP address) of the active instance - subject to dynamic due =
to<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; =
failover.&nbsp; It is also possible to use a virtual address for the =
whole<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; VNF =
Pool (similar to RSerPool or VRRP), and map between virtual =
and<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; actual =
addresses.&nbsp; Moreover, when a live VNF instance goes out =
of<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; =
service, how does the Service Control Entity learn which VNF =
instance<o:p></o:p></span></p><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;&nbsp; will =
replace it, and learn the characteristic of the new =
instance?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>[Sue&#8217;s opine on] <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>The addressing between the VNF and the Service =
Control entity is an important part.&nbsp; VRRP worked in the past for =
some of VNF/Service Control Entity, but had failure points within =
servers with VMs, and <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Failures points across multiple servers with VMs. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Are we allowing VNF pools to go across multiple =
servers in multiple locations? <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Within a single machine with the right OS =
modifications, the VRRP has simplicity<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>and a sub-second VRRP failover is possible. VRRP can =
expand to multiple boxes,<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>and a subsecond failover is possible, but has =
additional requirements to <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>instrument the sub-second failover between VMs. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>The point is &#8230; we should know from the past =
work with RSerPool and VRRP where the issues with the can be.&nbsp; The =
WG should be able to choose to:<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'><span =
style=3D'mso-list:Ignore'>a)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp; </span></span></span><![endif]><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>select existing protocols, <o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'><span =
style=3D'mso-list:Ignore'>b)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp; </span></span></span><![endif]><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>extend existing protocol, or =
<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'><span =
style=3D'mso-list:Ignore'>c)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp; </span></span></span><![endif]><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>create new protocols. <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>We should prefer a and b over c.&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";color:#1F497D'>[Sue =
opine off]<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Is this what you are considering in this problem =
statement? If so, then your draft really, really improves the clarity of =
the problem. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#1F497D'>Sue <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'>=3D=3D=3D=3D=3D<o:p></o:p></span=
></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;color:#1F497D'>By the =
way: &nbsp;</span><span =
style=3D'font-size:11.0pt;font-family:"Arial","sans-serif";color:#222222;=
background:white'>Opine &#8211;means to hold and state as one's =
opinion</span><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
vnfpool [mailto:vnfpool-bounces@ietf.org] <b>On Behalf Of =
</b>Zongning<br><b>Sent:</b> Monday, May 05, 2014 4:47 AM<br><b>To:</b> =
vnfpool@ietf.org<br><b>Subject:</b> [vnfpool] Version 05 of VNFPool =
Problem Statement<o:p></o:p></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'>Hi,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:ZH-CN'>A new =
revision -05 of VNFPool Problem Statement I-D is posted as =
below:<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><a =
href=3D"http://www.ietf.org/id/draft-zong-vnfpool-problem-statement-05.tx=
t">http://www.ietf.org/id/draft-zong-vnfpool-problem-statement-05.txt</a>=
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:ZH-CN'>Many thanks =
to Qiang, Marco, and Georgios for your comments on -04 version. I mainly =
incorporated your suggestions, as well as further clarified VNFPool =
scope and relation to SFC.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:ZH-CN'>Main =
changes:<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 =
lfo2'><![if !supportLists]><span =
style=3D'mso-fareast-language:ZH-CN'><span =
style=3D'mso-list:Ignore'>1)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'mso-fareast-language:ZH-CN'>Update definition of VNF set to =
clarify the relation to VNF pools;<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 =
lfo2'><![if !supportLists]><span =
style=3D'mso-fareast-language:ZH-CN'><span =
style=3D'mso-list:Ignore'>2)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'mso-fareast-language:ZH-CN'>Focus VNFPool scope to internal =
VNF, and interface between VNF and Service Control Entity, *<b>not</b>* =
communications between VNFs;<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 =
lfo2'><![if !supportLists]><span =
style=3D'mso-fareast-language:ZH-CN'><span =
style=3D'mso-list:Ignore'>3)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'mso-fareast-language:ZH-CN'>Change 5.4 to &#8220;Interaction =
between VNF and Service Control Entity&#8221;;<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 =
lfo2'><![if !supportLists]><span =
style=3D'mso-fareast-language:ZH-CN'><span =
style=3D'mso-list:Ignore'>4)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'mso-fareast-language:ZH-CN'>Emphasize that we currently assume =
VNF pool contains the instances of same functional type, *<b>not</b>* =
different VNF components;<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 =
lfo2'><![if !supportLists]><span =
style=3D'mso-fareast-language:ZH-CN'><span =
style=3D'mso-list:Ignore'>5)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'mso-fareast-language:ZH-CN'>Update 6.3 about VNFPool relation =
to SFC;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:ZH-CN'>Please =
folks continue reviewing the new version. Your comments are ALWAYS =
welcome!<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'>-Ning<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></span></p></div></=
body></html>
------=_NextPart_000_012D_01CF80E1.D21E6D00--


From nobody Thu Jun  5 14:19:14 2014
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From: "Susan Hares" <shares@ndzh.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/vnfpool/EOkUsmp2wpuyAHUPUmwmsoxkygI
Subject: Re: [vnfpool] new VNFPool draft charter
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Melinda:

If it is a layer 9 issue (politics) to get the work started, then it out of
scope. I really just want to get going on this work. 

Sue 

-----Original Message-----
From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Melinda Shore
Sent: Thursday, June 05, 2014 5:03 PM
To: vnfpool@ietf.org
Subject: Re: [vnfpool] new VNFPool draft charter

On 6/5/14 12:44 PM, Susan Hares wrote:
> Melinda:
> 
> If we leave it scope for this phase,  but open for some future phase I 
> think it will help the discussion.  This will allows to build toward this
phase.
> Of course, I'm coming from the router/SDN platform view point. 

I think it will help among people who'd like to use it but hurt us
politically, to be frank - this is an issue that always raises a lot of ire
in the quarter of the IETF in which we're now operating.  We'd also be faced
with the difficult of answering the question of why a vendor would want a
customer to be able to fail, say, their firewall over to another vendor's
firewall.  The obvious answer to that is that customers want it, but that
doesn't mean that vendors will implement that kind of mechanism, and when
we've done polls about this kind of thing we haven't been able to get any
vendor to say they'd do it.  So, if people really want to include text
saying that this is future work, by all means do so but do so with knowledge
of how discussions have gone in the very recent past.

And to be clear, to say that it's out of scope means that it's out of scope
*now* - as we know all decisions may be revisited in the future.

Melinda

--
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."

_______________________________________________
vnfpool mailing list
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From nobody Thu Jun  5 14:26:16 2014
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Subject: Re: [vnfpool] Virtualized vs. physical network functions
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Dr. Pedro:=20

I think you have mentioned  a very important point about costs. Data =
centers have a "fail in place" methodology to deal with hardware failure =
that reduces cost rather than have expensive hardware for servers or =
routers.=20

I want to also "ack" what you are saying regarding the 'soft' =
instructions.  I have seen enterprises deploy next-gen solutions that =
are virtualized due to two abilities:=20

a) abilities to do partial deployment of new technology (may be a server =
or Virtual server gets added),=20
b) ability to reduce cost and increase uptime.=20

The VNF pools can provide back up in a partial deployment seamless =
across networks. I have deployments where just 10-15 servers in key =
spots with this type of VNF pool technology can greatly increase through =
(via virtual load balance, WAN optimizers, and firewalls).=20

Sue Hares

-----Original Message-----
From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of PEDRO =
ANDRES ARANDA GUTIERREZ
Sent: Saturday, May 10, 2014 3:00 AM
To: vnfpool@ietf.org
Subject: Re: [vnfpool] Virtualized vs. physical network functions

Hi Linda,
Congratulations for reading through a coding mess :-) Answers inline,

Best, /PA

Dr. Pedro A. Aranda Guti=C3=A9rrez

Technology Exploration -
Network Innovation & Virtualisation

mailto:paag@tid.es
Telef=C3=B3nica, Investigaci=C3=B3n y Desarrollo
C/ D. Ram=C3=B3n de la Cruz,84
28006 Madrid, Spain

Fragen sind nicht da, um beantwortet zu werden.
Fragen sind da, um gestellt zu werden.
Georg Kreisler



El 10/05/14 00:40, "Linda Dunbar" <linda.dunbar@huawei.com> =
escribi=C3=B3:

>Pedro,
>
>Are you saying that the physical boxes also have chance to fail, why=20
>VNFpool emphasizes so much on Virtualized Network Functions?

Yes, physical boxes also tend to fail (in the worst possible moment, if =
you believe in Murphy=E2=80=99s law :-) )

>Here is my take on this issue:
>
>It is very likely that the physical devices, either compute or storage=20
>devices, have embedded restoration & protection mechanism.

OK, but at what price? If you want to keep costs at a reasonable level, =
you will probably go to a virtualised environment, with HW that is more =
cost effective and with simpler mechanisms for resilience.

>Take your storage example, many storage arrays have their own embedded=20
>protection mechanism. When a server write/read from a storage array, it =

>doesn't know if the data is from stand-by devices.

Once again, I agree. But while many do, not all have it necessarily. =
This is also a question of costs. Thus we can=E2=80=99t take protection =
for granted in =E2=80=98discrete=E2=80=99 boxes.

>Whereas, in the virtualized environment, functions instantiated on=20
>virtual mechanism doesn't have its own protection mechanism. Therefore, =

>the "high availability" requires the "coordination" among all the other =

>instances, hopefully in the standard way.

Completely agree. And hopefully we can use the same standard mechanisms =
in cost effective physical (as opposed to virtualised) devices, too.

>Linda

My point is that I see network functions independently of the device =
that implements them and whether this is a physical device or a =
virtualised function. IMHO, hybrid environments tend to have the =
advantage of lowering the entry barrier: continue using what you have =
deployes and press the last dime out of it while introducing next-gen =
solutions in a virtualised environment that is more cost-effective than =
your current system. This =E2=80=98soft=E2=80=99 introduction also =
alleviates the pressure of having to cope with something completely new =
on network admins.

Best,/PA


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<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple" style=3D"text-justify-t=
rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi, Sue=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Yes, th=
is is exactly what we mean in both PS draft and charter text. The pooling i=
s transparent to outside service control entities/controllers using VNF to =
implement services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">-Ning<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
yle=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=BC=FE=C8=CB<span lang=3D=
"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;f=
ont-family:SimSun"> Susan Hares [mailto:shares@ndzh.com]
<br>
</span><b><span style=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=CB=CD=
=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:SimSun"> 2014</span><span style=3D"font=
-size:10.0pt;font-family:SimSun">=C4=EA<span lang=3D"EN-US">6</span>=D4=C2<=
span lang=3D"EN-US">6</span>=C8=D5<span lang=3D"EN-US">
 4:59<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Linda Dunbar; Zongning; vnfpool@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> RE: [vnfpool] new VNFPool draft charter<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Linda and Ning.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">My understanding from this charter is that the pool would be tran=
sparent to whatever entity used it.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">If it was a pool of firewalls, then the VNF would be a firewall. =
It would be hidden to SFC or SDN controller wanting to use the firewall tha=
t it was part of a pool.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">This comes from section 4 in the problem statement that states:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">=A1=B0The main benefit of using VNF Pool is the pooling mechanism=
 such as redundancy management are achieved by the VNF Pool inside the VNF =
and transparent to the Service Control Entity.
 &nbsp;The Service control Entity simply interacts with the Pool Manager in=
 each VNF to request and orchestrate the network functions with desired rel=
iability level.=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">To me, in my past work this was important to make the overall pro=
cess work simply.&nbsp; &nbsp;Is this the source of your astute question?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Sue
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a=
>]
<b>On Behalf Of </b>Linda Dunbar<br>
<b>Sent:</b> Wednesday, June 04, 2014 4:13 PM<br>
<b>To:</b> Zongning; <a href=3D"mailto:vnfpool@ietf.org">vnfpool@ietf.org</=
a><br>
<b>Subject:</b> Re: [vnfpool] new VNFPool draft charter<o:p></o:p></span></=
p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Ning,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">I made some wording changes to the proposed charter. The attached=
 Word document has the changes mark, making it easier to see. In case the m=
ailing list doesn=A1=AFt allow attachment,
 here is the proposed changes. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Should we also add a paragraph to show why/how VNFpool is differe=
nt from SFC?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">Linda<o:p></o:p></span></p>
<div style=3D"border:none;border-bottom:solid windowtext 1.0pt;padding:0cm =
0cm 1.0pt 0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be instantiated to build network services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to achieve higher reli=
ability, a pool of VNFs that perform the same function can be grouped toget=
her for the network services.&nbsp;
</span><span lang=3D"DE">Conceptionally, multiple instances of a same funct=
ion are grouped together and managed by its Pool Manager. Different functio=
ns have different pool manager.&nbsp; A
</span><span lang=3D"EN-US">Pool Manager is responsible for monitoring&nbsp=
; the status of the instances in the pool, selecting active/standby instanc=
es for specific services, and potentially interacts with other entities, e.=
g. service control entity or&nbsp; service orchestration
 system. The major benefit of using VNF Pool is that reliability mechanisms=
 such as redundancy &amp; protection are achieved by the VNF Pool and thus =
not visible to the service control entity.
<a style=3D"mso-comment-reference:L_1;mso-comment-date:20140604T1509">A VNF=
 Pool-enabled VNF still appears as a normal VNF when orchestrated by
</a></span><span style=3D"mso-comment-continuation:1"><span lang=3D"DE">a <=
/span><span lang=3D"EN-US">service control entity.</span></span><span class=
=3D"MsoCommentReference"><span lang=3D"EN-US" style=3D"font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;"><![if !supportAnnotations]><a class=3D"=
msocomanchor" id=3D"_anchor_1" onmouseover=3D"msoCommentShow('_anchor_1','_=
com_1')" onmouseout=3D"msoCommentHide('_com_1')" href=3D"#_msocom_1" langua=
ge=3D"JavaScript" name=3D"_msoanchor_1">[L1]</a><![endif]>&nbsp;</span></sp=
an><span class=3D"MsoCommentReference"><span lang=3D"EN-US" style=3D"font-s=
ize:10.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;</=
span></span><span class=3D"MsoCommentReference"><span lang=3D"EN-US" style=
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<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
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<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">When a live VNF instanc=
e goes out of service, how does the service control entity learn which inst=
ance in a VNF Pool will replace it, and learn the characteristics of the ne=
w instance?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms might include state=
 maintenance of instances in a VNF Pool</span><span lang=3D"DE">
 only for pooling purpose (service state synchronization is out of scope). =
The WG</span><span lang=3D"EN-US"> assume</span><span lang=3D"DE">s</span><=
span lang=3D"EN-US"> that a VNF Pool contains identical VNF instances of sa=
me functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-bottom:solid windowtext 1.0pt;padding:0cm =
0cm 1.0pt 0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a=
>]
<b>On Behalf Of </b>Zongning<br>
<b>Sent:</b> Tuesday, June 03, 2014 4:36 AM<br>
<b>To:</b> <a href=3D"mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
<b>Subject:</b> [vnfpool] new VNFPool draft charter<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi, folks,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see the below new draft =
charter of VNFPool. We believe that we have updated the charter to address =
most of the comments from London BoF. Main changes are:<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We narrow down our scop=
e to only focus on the redundancy model and the related interfaces associat=
ed with the VNF Pool in a single VNF.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Service state synchroni=
zation between VNF instances is out-of-scope. We may consider how to mainta=
in the pool states in a VNF Pool only for pooling purpose.<o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We assume that a VNF Po=
ol contains redundant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">We do not address relia=
bility related control or routing between adjacent VNFs in the service grap=
h. This is also applied to update the relation between VNF Pool and SFC WG.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Network functions such as firew=
alls, load balancers, and WAN optimizers are conventionally deployed as spe=
cialized hardware servers in both network operators' networks and data cent=
er networks as the building blocks of
 the network services. There is a trend to implement such network functions=
 as software instances running on general purpose servers, via a virtualiza=
tion layer (i.e., hypervisors). These virtualized functions are called Virt=
ualized Network Functions (VNFs),
 which can be used to build network services.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The use of VNFs introduces addi=
tional challenges to the reliability of the provided network services. A si=
ngle VNF instance would typically not have built-in reliability mechanisms =
on its host (i.e., a general purpose
 server). Instead, there are more factors of risk such as software failure =
at various levels including hypervisors and virtual machines, hardware fail=
ure, and instance migration that can make a VNF instance unreliable.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In order to provide </span><spa=
n lang=3D"DE">a
</span><span lang=3D"EN-US">reliable function, a VNF may adopt a pooling me=
chanism by using a number of VNF instances providing the same function, whi=
ch we call a =A1=B0VNF Pool=A1=B1.
</span><span lang=3D"DE">Conceptionally, a </span><span lang=3D"EN-US">Pool=
 Manager is used to manage the VNF Pool, e.g., selects active/standby VNF i=
nstances, and potentially interacts with a service control entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Questions that are raised by th=
e addition of a pooling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:24.6pt;text-indent:-3.6pt;line-height:150%;mso-l=
ist:l2 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">When a live VNF instanc=
e goes out of service, how does the service control entity learn which inst=
ance in a VNF Pool will replace it, and learn the characteristics of the ne=
w instance?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG initially focuses on sev=
eral reliability mechanisms that are mainly associated with a redundancy mo=
del based on a VNF Pool in a VNF. Additional mechanisms that may be needed =
include state maintenance in a VNF Pool
</span><span lang=3D"DE">only for pooling purpose (service state synchroniz=
ation is out of scope). The WG</span><span lang=3D"EN-US"> assume</span><sp=
an lang=3D"DE">s</span><span lang=3D"EN-US"> that a VNF Pool contains redun=
dant VNF instances of same functional type.
</span><span lang=3D"DE">Different types of VNFs are envisoned to be held i=
n separate VNF Pools.
</span><span lang=3D"EN-US">The WG will address the reliability of an indiv=
idual VNF</span><span lang=3D"DE">, but not the</span><span lang=3D"EN-US">=
 reliability related to the control or the routing between adjacent VNFs
</span><span lang=3D"DE">that can form a network service</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Specifically, the WG will work =
on the following technical aspects:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Redundancy management w=
ithin a VNF Pool, such as the signaling between the Pool Manager and the in=
stances in the pool for instance registration, backup instances selection, =
and switching between active and standby
 instances.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between th=
e Pool Manager and the underlying network to collect the network informatio=
n required for appropriate placement/selection of backup instances.<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between a =
VNF and the service control entity to exchange operational information betw=
een a VNF Pool</span><span lang=3D"DE"> and the service control entity.</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Identify and analyze re=
liable transport protocols, such as MPTCP and SCTP for reliable delivery of=
 the messages associated with the redundancy management within a VNF Pool.<=
o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto;margin-left:38.85pt;text-indent:-21.0pt;line-height:150%;mso=
-list:l0 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Analysis of pooling sec=
urity characteristics and requirements to identify and mitigate threats aga=
inst the pooling mechanism. Identification of an appropriate trust model be=
tween pool members, and between pool
 members and Pool Manager.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The WG plans to deliver a probl=
em statement, a set of use cases, VNF Pool requirements and an architecture=
 covering the aforementioned technical aspects, and applicability and gap a=
nalysis of existing technologies such
 as RSerPool. It is our expectation that we will be able to rely heavily on=
 existing IETF technologies, but that gaps will be found around problems li=
ke redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solely=
 for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. The WG will include consideration of the manageability=
 of a VNF Pool. The WG will seek re-chartering before adopting any work to =
develop new, or extend existing,
 protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In particular, we will work clo=
sely with the SFC WG, as we believe that SFC and VNF Pool are independent b=
ut complementary.
<span style=3D"color:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Information exchanged between the =
VNF Pool and the SFC may include some
 operational information from the VNF Pool including the pool address, pool=
 instance characteristic, and so on, as requested by the SFC WG.<o:p></o:p>=
</span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Goals and Milestones:<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2014 - Submit VNFPool =
Problem Statement to IESG for publication as Informational<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">April 2015 - Submit VNFPool Use=
 Cases to IESG for publication as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Re=
quirements, including the manageability of VNF Pool to IESG for publication=
 as Informational<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">August 2015 - Submit VNFPool Ar=
chitecture to IESG for publication as Proposed Standard<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">December 2015 - Submit Applicab=
ility and Gap Analysis of RSerPool to IESG for publication as Informational=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your comments and suggestions t=
o the charter text are highly appreciated!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning<o:p></o:p></span></p>
</div>
<div style=3D"mso-element:comment-list"><![if !supportAnnotations]>
<hr class=3D"msocomoff" align=3D"left" size=3D"1" width=3D"33%">
<![endif]>
<div style=3D"mso-element:comment"><![if !supportAnnotations]>
<div id=3D"_com_1" class=3D"msocomtxt" language=3D"JavaScript" onmouseover=
=3D"msoCommentShow('_anchor_1','_com_1')" onmouseout=3D"msoCommentHide('_co=
m_1')">
<![endif]><span style=3D"mso-comment-author:L73504"><![if !supportAnnotatio=
ns]><a name=3D"_msocom_1"></a><![endif]></span>
<p class=3D"MsoCommentText"><span class=3D"MsoCommentReference"><span lang=
=3D"EN-US" style=3D"font-size:8.0pt;font-family:&quot;Calibri&quot;,&quot;s=
ans-serif&quot;">&nbsp;</span></span><span lang=3D"EN-US">Not clear of the =
intent.
<o:p></o:p></span></p>
<p class=3D"MsoCommentText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoCommentText"><span lang=3D"EN-US">Do you mean: =A1=B0VNF ins=
tances in the VNF pool are still visible by the service control entity=A1=
=B1?
</span></p>
<![if !supportAnnotations]></div>
<![endif]></div>
</div>
</body>
</html>

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From: Zongning <zongning@huawei.com>
To: Susan Hares <shares@ndzh.com>, "'Melinda Shore'" <melinda.shore@nomountain.net>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: [vnfpool] new VNFPool draft charter
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From nobody Thu Jun  5 19:29:28 2014
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From: Zongning <zongning@huawei.com>
To: Susan Hares <shares@ndzh.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: [vnfpool] Version 05 of VNFPool Problem Statement
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<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple" style=3D"text-justify-t=
rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi, Sue=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
for review. See inline marked by [Ning].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
yle=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=BC=FE=C8=CB<span lang=3D=
"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;f=
ont-family:SimSun"> Susan Hares [mailto:shares@ndzh.com]
<br>
</span><b><span style=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=CB=CD=
=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:SimSun"> 2014</span><span style=3D"font=
-size:10.0pt;font-family:SimSun">=C4=EA<span lang=3D"EN-US">6</span>=D4=C2<=
span lang=3D"EN-US">6</span>=C8=D5
<span lang=3D"EN-US">5:16<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Zongning; vnfpool@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> RE: [vnfpool] Version 05 of VNFPool Problem Statement<o:p></o:p></span></=
span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Ning:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">In looking at the diffs from =
-04 question, I delighted with at the clarity of the restatement of much of=
 the text.&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Kudos/Congratulations on the =
excellent job there. &nbsp;I only hope I do as well in the editing of docum=
ents.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">[Ning] =
Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">However one editorial issues:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Section 5.6
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">We do not work on other manag=
ement aspects of the VNF such as scaling, or load balancing, even though th=
ese aspects may be complementary to reliability
 in order to provide network services. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">[I think you want to say .. W=
ill do not plan to work on=A1=AD ]
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">[Ning] =
We will still need to clean-up this part of content in the next revision be=
fore Toronto. Anyway, the current statement may be over-shooting, by exclud=
ing some useful mechanisms for VNFPool
 itself. We will make it more clear.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">On a few technical points, I=
=A1=AFd like to opine<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:#1F497D"><span style=3D"mso-list:Ignore"=
>1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;;color:#1F497D">Changes to Section 5.=
4
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#222222;background:white">&nbsp;<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">5=
.4.&nbsp; Interaction between VNF and Service Control Entity<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;"><=
o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; Some information needs to be exchanged between a VNF and the Se=
rvice<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; Control Entity when the Service Control Entity orchestrates a V=
NF<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; Pool-enable VNF.&nbsp; For example, how can a VNF Pool be addre=
ssed by the<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; Service Control Entity?&nbsp; A Pool Manager can advertise the =
locator<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; (e.g., IP address) of the active instance - subject to dynamic =
due to<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; failover.&nbsp; It is also possible to use a virtual address fo=
r the whole<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; VNF Pool (similar to RSerPool or VRRP), and map between virtual=
 and<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; actual addresses.&nbsp; Moreover, when a live VNF instance goes=
 out of<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; service, how does the Service Control Entity learn which VNF in=
stance<o:p></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">&=
nbsp;&nbsp; will replace it, and learn the characteristic of the new instan=
ce?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">[Sue=A1=AFs opine on]
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">The addressing between the VN=
F and the Service Control entity is an important part.&nbsp; VRRP worked in=
 the past for some of VNF/Service Control Entity, but
 had failure points within servers with VMs, and <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Failures points across multip=
le servers with VMs.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Are we allowing VNF pools to =
go across multiple servers in multiple locations?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Within a single machine with =
the right OS modifications, the VRRP has simplicity<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">and a sub-second VRRP failove=
r is possible. VRRP can expand to multiple boxes,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">and a subsecond failover is p=
ossible, but has additional requirements to
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">instrument the sub-second fai=
lover between VMs.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">The point is =A1=AD we should=
 know from the past work with RSerPool and VRRP where the issues with the c=
an be.&nbsp; The WG should be able to choose to:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:#1F497D"><span style=3D"mso-list:Ignore"=
>a)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;;color:#1F497D">select existing proto=
cols,
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:#1F497D"><span style=3D"mso-list:Ignore"=
>b)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;;color:#1F497D">extend existing proto=
col, or
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:#1F497D"><span style=3D"mso-list:Ignore"=
>c)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;;color:#1F497D">create new protocols.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">We should prefer a and b over=
 c.&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">[Sue opine off]<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">[Ning] =
Yes, we do prefer a &amp; b, by further investigating and gap analyzing RSe=
rPool, VRRP, and maybe more protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Is this what you are consider=
ing in this problem statement? If so, then your draft really, really improv=
es the clarity of the problem.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:#1F497D">Sue
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D">By the way: &nbsp;</span><span lang=3D"EN-US" style=3D"font-size:=
11.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#222222;b=
ackground:white">Opine =A8Cmeans to hold and state as one's opinion</span><=
span lang=3D"EN-US" style=3D"font-size:11.0pt;color:#1F497D"><o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> vnfpool [<a =
href=3D"mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a=
>]
<b>On Behalf Of </b>Zongning<br>
<b>Sent:</b> Monday, May 05, 2014 4:47 AM<br>
<b>To:</b> <a href=3D"mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
<b>Subject:</b> [vnfpool] Version 05 of VNFPool Problem Statement<o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">A new revision -05 of VNFPool P=
roblem Statement I-D is posted as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"http://www.ietf.org/=
id/draft-zong-vnfpool-problem-statement-05.txt">http://www.ietf.org/id/draf=
t-zong-vnfpool-problem-statement-05.txt</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Many thanks to Qiang, Marco, an=
d Georgios for your comments on -04 version. I mainly incorporated your sug=
gestions, as well as further clarified VNFPool scope and relation to SFC.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Main changes:<o:p></o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l2 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Update definition of VN=
F set to clarify the relation to VNF pools;<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l2 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Focus VNFPool scope to =
internal VNF, and interface between VNF and Service Control Entity, *<b>not=
</b>* communications between VNFs;<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l2 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Change 5.4 to =A1=B0Int=
eraction between VNF and Service Control Entity=A1=B1;<o:p></o:p></span></p=
>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l2 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Emphasize that we curre=
ntly assume VNF pool contains the instances of same functional type, *<b>no=
t</b>* different VNF components;<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l2 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">5=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Update 6.3 about VNFPoo=
l relation to SFC;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please folks continue reviewing=
 the new version. Your comments are ALWAYS welcome!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
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To: ext Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
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From: Zu Qiang <zu.qiang@ericsson.com>
To: Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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To: <zu.qiang@ericsson.com>, <zongning@huawei.com>, <vnfpool@ietf.org>
Date: Fri, 6 Jun 2014 20:59:13 +0200
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From nobody Fri Jun  6 12:08:02 2014
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From: Zu Qiang <zu.qiang@ericsson.com>
To: "N.Leymann@telekom.de" <N.Leymann@telekom.de>, "zongning@huawei.com" <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Subject: Re: [vnfpool] new VNFPool draft charter
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--_000_A4288FE24C337B47BB634F1E76CBF2EC28B59CD2eusaamb107erics_--


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On 6/6/14 10:40 AM, Zu Qiang wrote:
> -          It is good to narrow down the scope to redundancy module
> only. I=92m assuming that a transparent redundancy module is the
> preferable solution of this WG. With transparent solutions, no impacts
> are expected on the pool user. Therefore, I would avoid any linkage wit=
h
> SFC.

We tried that!  There's some fairly deep concern about
overlap, and about whether or not some of this might encroach
on sfc turf - that was probably the main issue raised at
the BOF at IETF 89.  Because of that it's necessary to highlight
the differences between the work and clarify the relationship
between what sfc is doing and what vnfpool would do.

> -          I also don=92t understand the statement =93When a live VNF
> instance goes out of service, how does the service control entity learn
> which instance in a VNF Pool will replace it, and learn the
> characteristics of the new instance?=94 If transparent solutions are
> expected, why SCE needs to learn the failover?

That's a good point.

> -          My assumption is that the output from this proposed WG is on=
e
> or more generic HA solutions. As we are in the early stage of the
> discussion, I don=92t think we shall limit the solution to a specific o=
ne.
> I do have a hard time to understand why the Applicability and Gap
> Analysis shall be done based on a specific protocol?

IETF work tends to be bottom-up - specific, discrete, concrete
pieces of work are identified and scoped.  We don't solve A Big
Problem and assume it's generally applicable, but rather do work
of the nature of "Here's how to use <x> to do <y>."  It may in
fact turn out that there's interest in developing an availability
mechanism based on a different architectural model, and that's
okay.

> -          Reading the charter, it is not very clear that what the scop=
e
> of the VNF is. Is it the service/function, or the entities providing
> this service/function?=20

I think this is the question that "service state synchronization is
out of scope" answers.

Melinda


--=20
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."


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From: Zu Qiang <zu.qiang@ericsson.com>
To: Melinda Shore <melinda.shore@nomountain.net>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: [vnfpool] new VNFPool draft charter
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Have a nice day
Zu Qiang

>> -          My assumption is that the output from this proposed WG is one
>> or more generic HA solutions. As we are in the early stage of the
>> discussion, I don't think we shall limit the solution to a specific one.
>> I do have a hard time to understand why the Applicability and Gap
>> Analysis shall be done based on a specific protocol?
>
>IETF work tends to be bottom-up - specific, discrete, concrete pieces of w=
ork are
>identified and scoped.  We don't solve A Big Problem and assume it's gener=
ally
>applicable, but rather do work of the nature of "Here's how to use <x> to =
do
><y>."  It may in fact turn out that there's interest in developing an avai=
lability
>mechanism based on a different architectural model, and that's okay.
>

[Zu Qiang] Just for my clarification. Does that means all the WG discussion=
 must be based on that specific solution from day one?
>
>Melinda
>
>
>--
>Melinda Shore
>No Mountain Software
>melinda.shore@nomountain.net
>
>"Software longa, hardware brevis."
>
>_______________________________________________
>vnfpool mailing list
>vnfpool@ietf.org
>https://www.ietf.org/mailman/listinfo/vnfpool


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On 6/6/14 11:20 AM, Zu Qiang wrote:
> [Zu Qiang] Just for my clarification. Does that means all the WG discussion must be based on that specific solution from day one?

The working group hasn't been chartered yet, but if a group
is formed based on some version of the current charter, the
documents need to stick to that charter.  If there's a proposal
for a reliability mechanism based on a different model the
best thing to do is to prepare a draft and get feedback on it,
and create interest.  But, if there's no specific proposal
but broad interest in discussing availability/reliability
mechanisms more generally, it may be possible to create a
non-WG mailing list.

Melinda


-- 
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."


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From: Zongning <zongning@huawei.com>
To: Zu Qiang <zu.qiang@ericsson.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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From: Zongning <zongning@huawei.com>
To: Zu Qiang <zu.qiang@ericsson.com>, Melinda Shore <melinda.shore@nomountain.net>, "vnfpool@ietf.org" <vnfpool@ietf.org>
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From: Zongning <zongning@huawei.com>
To: "N.Leymann@telekom.de" <N.Leymann@telekom.de>, "zu.qiang@ericsson.com" <zu.qiang@ericsson.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Date: Mon, 9 Jun 2014 02:42:22 +0000
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From: "Ersue, Mehmet (NSN - DE/Munich)" <mehmet.ersue@nsn.com>
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From: Zu Qiang <zu.qiang@ericsson.com>
To: Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Subject: Re: [vnfpool] new VNFPool draft charter
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rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">Hello=
, Zongning<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; Thanks for your reply. See inline below.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span style=
=3D"font-size:14.0pt;font-family:Chiller;color:#1F497D">Have a nice day<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span style=
=3D"font-size:14.0pt;font-family:Chiller;color:#1F497D">Zu Qiang<o:p></o:p>=
</span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Zongning [ma=
ilto:zongning@huawei.com]
<br>
<b>Sent:</b> Sunday, June 08, 2014 10:28 PM<br>
<b>To:</b> Zu Qiang; vnfpool@ietf.org<br>
<b>Subject:</b> </span><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-=
family:SimSun">=B4=F0=B8=B4</span><span lang=3D"EN-US" style=3D"font-size:1=
0.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">: new VNFPool =
draft charter<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><o:p>&nbsp;=
</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi, Qia=
ng,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
for the comments. Please see inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">It is good to narrow down the scope to redundancy module only. I=A1=AFm =
assuming that a transparent redundancy module is the preferable solution of=
 this WG. With transparent solutions, no
 impacts are expected on the pool user. Therefore, I would avoid any linkag=
e with SFC.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] Yes, the poolin=
g mechanism will be transparent to the pool user. But a VNF including a VNF=
 Pool (we call a VNFPool-enabled VNF) will be used as a normal VNF in a ser=
vice chain to build a network service.
 Therefore, from the service orchestration point of view, some features (mo=
stly operational, NOT pooling mechanism) of a VNFPool-enabled VNF such as a=
ddress/location, load capability, etc., are still needed by the service con=
trol entity.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;color:#1F497D"=
>[Zu Qiang] My understanding is that SFC is just one of the VNF pool users.=
 It shall not make any different with another network applications which wi=
ll use the VNF pool for redundancy.
 Therefore I don=A1=AFt see any need for a linkage with SFC in the charter.=
 </span></i></b><span style=3D"font-size:11.0pt;color:#1F497D"><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">I also don=A1=AFt understand the statement =A1=B0</span>When a live VNF =
instance goes out of service, how does the service control entity learn whi=
ch instance in a VNF Pool will replace it, and
 learn the characteristics of the new instance?<span style=3D"font-size:11.=
0pt;color:#1F497D">=A1=B1 If transparent solutions are expected, why SCE ne=
eds to learn the failover?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] Excellent point=
! You are right that this sentence is somehow misleading. How about a new s=
entence like -
</span><span style=3D"font-size:11.0pt;color:#1F497D">=A1=B0</span>After a =
VNF instance failover, how does the Pool Manager notify the service control=
 entity some characteristic changes of the VNF, but without disclosure of t=
he pooling procedure?<span style=3D"font-size:11.0pt;color:#1F497D">=A1=B1.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;color:#1F497D"=
>[Zu Qiang] It=A1=AFs good that you agree with me. The PM-SCE interface is =
more for the purpose of the pool OAM. The PM shall report to the SCE with t=
he pool status (including both the application
 and the HW) at any time or periodically, right? Therefore the above statem=
ent shall be in the scope of the normal OAM report, isn=A1=AFt it? Failover=
 is just a normal HA procedure. The SCE doesn=A1=AFt have to know it. If th=
e failover is due to an application error,
 the PM may have enough capability to handle it. But if the failover is due=
 to a HW or VM problem where new network resource allocation may be needed,=
 it may be good to inform the SCE. If that is agreeable, I propose some rew=
ording such as =A1=B0</span></i></b>How
 does the Pool Manager notify the Service Control Entity of some characteri=
stic changes of the VNF, e.g. system failure, but without disclosure of the=
 pooling procedure?<b><i><span style=3D"font-size:11.0pt;color:#1F497D">=A1=
=B1</span></i></b><span style=3D"font-size:11.0pt;color:#1F497D"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">There was some discussions in the mailing list regarding the virtualized=
/non-virtualized case where a network application may run on a server with/=
without a hypervisor. In both cases
 (with/without a hypervisor), the application may not have any redundancy s=
olutions. Both cases shall be covered by the solutions provided by this WG.=
 However the charter only have virtualized functions covered. Is the non-vi=
rtualized use case out of the scope?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] I agree with yo=
u, Nic and Pedro that the solution should be applicable to non-virtualized =
function, from the pooling perspective. But, consider that we currently don=
=A1=AFt describe any specific solution in
 the charter, how about add a new sentence like =A8C =A1=B0</span><span lan=
g=3D"EN-US" style=3D"color:#1F497D">VNF Pool composed by both virtualized a=
nd non-virtualized functional instances will be included after further use =
case and requirements study</span><span style=3D"color:#1F497D">=A1=B1.
 With this statement, I=A1=AFd solicit you all to bring use case and requir=
ement for the pooling of non-virtualized function, to help the future solut=
ion developed by the WG to cover both.
</span><span style=3D"font-family:Wingdings;color:#1F497D">J<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;color:#1F497D"=
>[Zu Qiang] Great.</span></i></b><span style=3D"font-size:11.0pt;color:#1F4=
97D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">Some statements, such as =A1=B0Identify and analyze reliable transport p=
rotocols=A1=B1, sounds like we do have a specific solution already. I won=
=A1=AFt assume there is always an IP connection between
 the pool manager and the pool instance. The interface between the two enti=
ties can be a TCP based protocol if there is an IP connection, or it can be=
 an API if they both locate in the same server. It is real dependence on th=
e solutions itself. Besides, if
 HW redundancy is needed that there may be always a =A1=B0remote=A1=B1 inst=
ance. The question is really how the =A1=B0remote=A1=B1 instance is handled=
, by whom; what homogeneity is assumed or whether this should be part of th=
e investigation. If it is expected that the VNF instances
 of a pool come from different vendors then even the state synchronization =
becomes an issue. If the pools are expected to be built from identical inst=
ances then one questions why should the pool manager come from a different =
vendor. I won=A1=AFt want to see any
 solution limitations at this stage of the discussion. And I prefer to keep=
 it open until the solution discussion phase.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] I think the sta=
tement =A1=B0Identify and analyze reliable transport protocols=A1=B1 is mor=
e like a requirement for the reliable delivery of pooling messages. We give=
 examples of existing IETF solution like MPTCP,
 but this doesn=A1=AFt mean we have already determined the solution at this=
 stage. You are right that we are open to solutions and solution discussion=
 will be in next phase.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;color:#1F497D"=
>[Zu Qiang] If that=A1=AFs the case, please make it clear in the charter. A=
nd I propose to reword with =A1=B0</span></i></b><span style=3D"color:#1F49=
7D">Identify and analyze reliable interfaces
<s>transport protocols</s></span><b><i><span style=3D"font-size:11.0pt;colo=
r:#1F497D">=A1=B1</span></i></b><span style=3D"font-size:11.0pt;color:#1F49=
7D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">My assumption is that the output from this proposed WG is one or more ge=
neric HA solutions. As we are in the early stage of the discussion, I don=
=A1=AFt think we shall limit the solution
 to a specific one. I do have a hard time to understand why the Applicabili=
ty and Gap Analysis shall be done based on a specific protocol?<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] I believe you h=
ad misunderstood the Applicability and Gap Analysis I-D (to RSerPool) at th=
is point.
</span><span style=3D"font-family:Wingdings;color:#1F497D">J</span><span st=
yle=3D"color:#1F497D"> I think anyone (other than RSerPool folks) can bring=
 their I-D about applicability and gap analysis to solution =A1=B0x=A1=B1. =
Currently we have an I-D based on RSerPool. But
 this doesn=A1=AFt mean that the WG will start solution based on RSerPool. =
We will be looking at more reference solutions and find out which parts of =
them can be reused/extended/referred/etc.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;color:#1F497D"=
>[Zu Qiang] If that=A1=AFs the case, it would be good to make it clear in t=
he charter to avoid any misunderstandings or layer 9 issues.
</span></i></b><span style=3D"font-size:11.0pt;color:#1F497D"><o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"font-size:11.0pt;color:#1F497D"><span s=
tyle=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:11.0pt;color:#1F497=
D">Reading the charter, it is not very clear that what the scope of the VNF=
 is. Is it the service/function, or the entities providing this service/fun=
ction? Some clarification of this
 use would be good.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Ning] In&nbsp; our ch=
arter, a VNF includes a pool of VNF instances implementing a certain functi=
on (not a whole service), and a manager to interface with the outside servi=
ce control entity to provide such function.
 So I assume a VNF has both roles in your question. Does it make sense? Or =
you have some suggested text to further clarify this issue?
</span><span style=3D"font-family:Wingdings;color:#1F497D">J</span><span st=
yle=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#1F497D">[Zu Qiang] So th=
e WG will work on the Pool enabled VNF (not the generic VNF), right?
</span></i></b><b><i><span style=3D"font-family:Wingdings;color:#1F497D">J<=
/span><span style=3D"color:#1F497D"> And a Pool enabled VNF including the V=
NF function and the network entities (e.g. HW, interface, etc.), right? It =
is better to add this clarification
 in the charter. </span></i></b><span style=3D"color:#1F497D"><o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I hope =
my reply helps to address your concerns. Otherwise please let me know.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">-Ning</=
span><span style=3D"color:#1F497D"><o:p></o:p></span></p>
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From: Zongning <zongning@huawei.com>
To: Zu Qiang <zu.qiang@ericsson.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: new VNFPool draft charter
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Date: Tue, 10 Jun 2014 02:52:39 +0000
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi, Qia=
ng,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Please =
see inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">It is good to narrow down the scope to redundancy module =
only. I=A1=AFm assuming that a transparent redundancy module is the prefera=
ble solution of this WG. With transparent
 solutions, no impacts are expected on the pool user. Therefore, I would av=
oid any linkage with SFC.
</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
Yes, the pooling mechanism will be transparent to the pool user. But a VNF =
including a VNF Pool (we call a VNFPool-enabled VNF) will be used as a norm=
al VNF in a service chain to build a network
 service. Therefore, from the service orchestration point of view, some fea=
tures (mostly operational, NOT pooling mechanism) of a VNFPool-enabled VNF =
such as address/location, load capability, etc., are still needed by the se=
rvice control entity.</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt=
;color:#1F497D">[Zu Qiang] My understanding is that SFC is just one of the =
VNF pool users. It shall not make any different with another network applic=
ations which will use the VNF pool for
 redundancy. Therefore I don=A1=AFt see any need for a linkage with SFC in =
the charter.
</span></i></b><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt"><o:p><=
/o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
The reason we describe the relation between SFC and VNFPool is mainly based=
 on the conclusion of London BoF, where people wanted to see such relation =
to be clearly addressed in the new charter.
 I agree with you that SFC is just one type of service control entities/poo=
l users, so we don=A1=AFt state how SFC differ from other pool users in the=
 charter. If you still feel uncomfortable, I=A1=AFd replace the last senten=
ce to =A1=B0</span><span lang=3D"EN-US" style=3D"color:black">Just
 like the communication between any pool user and VNF Pool, the information=
 exchanged between the VNF Pool and the SFC may include some operational in=
formation of the VNF Pool=A1=B1.
</span><span lang=3D"EN-CA" style=3D"color:#1F497D">Make sense?<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">I also don=A1=AFt understand the statement =A1=B0</span><=
span lang=3D"EN-CA">When a live VNF instance goes out of service, how does =
the service control entity learn which instance
 in a VNF Pool will replace it, and learn the characteristics of the new in=
stance?</span><span lang=3D"EN-CA" style=3D"font-size:11.0pt;color:#1F497D"=
>=A1=B1 If transparent solutions are expected, why SCE needs to learn the f=
ailover?</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
Excellent point! You are right that this sentence is somehow misleading. Ho=
w about a new sentence like -
</span><span lang=3D"EN-CA" style=3D"font-size:11.0pt;color:#1F497D">=A1=B0=
</span><span lang=3D"EN-CA">After a VNF instance failover, how does the Poo=
l Manager notify the service control entity some characteristic changes of =
the VNF, but without disclosure of the pooling
 procedure?</span><span lang=3D"EN-CA" style=3D"font-size:11.0pt;color:#1F4=
97D">=A1=B1.</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt=
;color:#1F497D">[Zu Qiang] It=A1=AFs good that you agree with me. The PM-SC=
E interface is more for the purpose of the pool OAM. The PM shall report to=
 the SCE with the pool status (including both
 the application and the HW) at any time or periodically, right? Therefore =
the above statement shall be in the scope of the normal OAM report, isn=A1=
=AFt it? Failover is just a normal HA procedure. The SCE doesn=A1=AFt have =
to know it. If the failover is due to an application
 error, the PM may have enough capability to handle it. But if the failover=
 is due to a HW or VM problem where new network resource allocation may be =
needed, it may be good to inform the SCE. If that is agreeable, I propose s=
ome rewording such as =A1=B0</span></i></b><span lang=3D"EN-CA">How
 does the Pool Manager notify the Service Control Entity of some characteri=
stic changes of the VNF, e.g. system failure, but without disclosure of the=
 pooling procedure?</span><b><i><span lang=3D"EN-CA" style=3D"font-size:11.=
0pt;color:#1F497D">=A1=B1</span></i></b><span lang=3D"EN-CA"><o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
Your understanding is correct. But I don=A1=AFt think =A1=B0system failure=
=A1=B1 is clear enough, as =A1=B0system=A1=B1 is a fairly general term. How=
 about =A1=B0resource re-allocation=A1=B1, or =A1=B0load/capacity change=A1=
=B1?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">There was some discussions in the mailing list regarding =
the virtualized/non-virtualized case where a network application may run on=
 a server with/without a hypervisor.
 In both cases (with/without a hypervisor), the application may not have an=
y redundancy solutions. Both cases shall be covered by the solutions provid=
ed by this WG. However the charter only have virtualized functions covered.=
 Is the non-virtualized use case
 out of the scope?</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
I agree with you, Nic and Pedro that the solution should be applicable to n=
on-virtualized function, from the pooling perspective. But, consider that w=
e currently don=A1=AFt describe any specific
 solution in the charter, how about add a new sentence like =A8C =A1=B0</sp=
an><span lang=3D"EN-US" style=3D"color:#1F497D">VNF Pool composed by both v=
irtualized and non-virtualized functional instances will be included after =
further use case and requirements study</span><span lang=3D"EN-CA" style=3D=
"color:#1F497D">=A1=B1.
 With this statement, I=A1=AFd solicit you all to bring use case and requir=
ement for the pooling of non-virtualized function, to help the future solut=
ion developed by the WG to cover both.
</span><span lang=3D"EN-CA" style=3D"font-family:Wingdings;color:#1F497D">J=
</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt=
;color:#1F497D">[Zu Qiang] Great.</span></i></b><span lang=3D"EN-CA"><o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">Some statements, such as =A1=B0Identify and analyze relia=
ble transport protocols=A1=B1, sounds like we do have a specific solution a=
lready. I won=A1=AFt assume there is always an IP connection
 between the pool manager and the pool instance. The interface between the =
two entities can be a TCP based protocol if there is an IP connection, or i=
t can be an API if they both locate in the same server. It is real dependen=
ce on the solutions itself. Besides,
 if HW redundancy is needed that there may be always a =A1=B0remote=A1=B1 i=
nstance. The question is really how the =A1=B0remote=A1=B1 instance is hand=
led, by whom; what homogeneity is assumed or whether this should be part of=
 the investigation. If it is expected that the VNF instances
 of a pool come from different vendors then even the state synchronization =
becomes an issue. If the pools are expected to be built from identical inst=
ances then one questions why should the pool manager come from a different =
vendor. I won=A1=AFt want to see any
 solution limitations at this stage of the discussion. And I prefer to keep=
 it open until the solution discussion phase.</span><span lang=3D"EN-CA"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
I think the statement =A1=B0Identify and analyze reliable transport protoco=
ls=A1=B1 is more like a requirement for the reliable delivery of pooling me=
ssages. We give examples of existing IETF solution
 like MPTCP, but this doesn=A1=AFt mean we have already determined the solu=
tion at this stage. You are right that we are open to solutions and solutio=
n discussion will be in next phase.</span><span lang=3D"EN-CA"><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt=
;color:#1F497D">[Zu Qiang] If that=A1=AFs the case, please make it clear in=
 the charter. And I propose to reword with =A1=B0</span></i></b><span lang=
=3D"EN-CA" style=3D"color:#1F497D">Identify and analyze
 reliable interfaces <s>transport protocols</s></span><b><i><span lang=3D"E=
N-CA" style=3D"font-size:11.0pt;color:#1F497D">=A1=B1</span></i></b><span l=
ang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
I am OK with your proposal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">My assumption is that the output from this proposed WG is=
 one or more generic HA solutions. As we are in the early stage of the disc=
ussion, I don=A1=AFt think we shall limit
 the solution to a specific one. I do have a hard time to understand why th=
e Applicability and Gap Analysis shall be done based on a specific protocol=
?</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
I believe you had misunderstood the Applicability and Gap Analysis I-D (to =
RSerPool) at this point.
</span><span lang=3D"EN-CA" style=3D"font-family:Wingdings;color:#1F497D">J=
</span><span lang=3D"EN-CA" style=3D"color:#1F497D"> I think anyone (other =
than RSerPool folks) can bring their I-D about applicability and gap analys=
is to solution =A1=B0x=A1=B1. Currently we have an
 I-D based on RSerPool. But this doesn=A1=AFt mean that the WG will start s=
olution based on RSerPool. We will be looking at more reference solutions a=
nd find out which parts of them can be reused/extended/referred/etc.</span>=
<span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt=
;color:#1F497D">[Zu Qiang] If that=A1=AFs the case, it would be good to mak=
e it clear in the charter to avoid any misunderstandings or layer 9 issues.
</span></i></b><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
Deal! No issues above layer 7.
</span><span lang=3D"EN-CA" style=3D"font-family:Wingdings;color:#1F497D">J=
</span><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:36.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-CA"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA" style=3D"font-size:11.0=
pt;color:#1F497D">Reading the charter, it is not very clear that what the s=
cope of the VNF is. Is it the service/function, or the entities providing t=
his service/function? Some clarification
 of this use would be good.</span><span lang=3D"EN-CA"><o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning] =
In&nbsp; our charter, a VNF includes a pool of VNF instances implementing a=
 certain function (not a whole service), and a manager to interface with th=
e outside service control entity to provide
 such function. So I assume a VNF has both roles in your question. Does it =
make sense? Or you have some suggested text to further clarify this issue?
</span><span lang=3D"EN-CA" style=3D"font-family:Wingdings;color:#1F497D">J=
</span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-CA" style=3D"color:#1F497D">[=
Zu Qiang] So the WG will work on the Pool enabled VNF (not the generic VNF)=
, right?
</span></i></b><b><i><span lang=3D"EN-CA" style=3D"font-family:Wingdings;co=
lor:#1F497D">J</span></i></b><b><i><span lang=3D"EN-CA" style=3D"color:#1F4=
97D"> And a Pool enabled VNF including the VNF function and the network ent=
ities (e.g. HW, interface, etc.), right?
 It is better to add this clarification in the charter. </span></i></b><spa=
n lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D">[Ning]Y=
es, the WG will focus on Pool enabled VNF. However, to be clear, we are not=
 working on HW/hypervisor layer functionalities. We focus on VNF function, =
and the associated resource status for
 pool OAM purpose only (as discussed in the second item above).<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I hope =
my reply helps to address your concerns. Otherwise please let me know.</spa=
n><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">&nbsp;<=
/span><span lang=3D"EN-CA"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">-Ning</=
span><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
</div>
</body>
</html>

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Subject: [vnfpool] BOF approved
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The results from today's BOF call have been posted
(http://trac.tools.ietf.org/bof/trac/wiki/WikiStart)
and we've been approved for IETF 90.

IETF face-to-face meetings are working meetings.  If you
are planning on asking for time on the agenda, right now
is an excellent time to raise any issues that you feel
need to be discussed in the session, identifying specific
problems that would benefit from real-time discussion.
If you understand this as meaning that drafts should be
posted soon, you're right!  Ning and I will be working on
an agenda over the next few weeks.

Many thanks for all the work that's been done to date,
and for the work yet to be done.

Melinda

-- 
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."


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Ning and Melinda:

Thank you for creating such a clearly defined problem statement and charter.
It will help us in the BOF.

Sue

-----Original Message-----
From: vnfpool [mailto:vnfpool-bounces@ietf.org] On Behalf Of Melinda Shore
Sent: Wednesday, June 11, 2014 4:00 PM
To: vnfpool@ietf.org
Subject: [vnfpool] BOF approved

The results from today's BOF call have been posted
(http://trac.tools.ietf.org/bof/trac/wiki/WikiStart)
and we've been approved for IETF 90.

IETF face-to-face meetings are working meetings.  If you are planning on
asking for time on the agenda, right now is an excellent time to raise any
issues that you feel need to be discussed in the session, identifying
specific problems that would benefit from real-time discussion.
If you understand this as meaning that drafts should be posted soon, you're
right!  Ning and I will be working on an agenda over the next few weeks.

Many thanks for all the work that's been done to date, and for the work yet
to be done.

Melinda

--
Melinda Shore
No Mountain Software
melinda.shore@nomountain.net

"Software longa, hardware brevis."

_______________________________________________
vnfpool mailing list
vnfpool@ietf.org
https://www.ietf.org/mailman/listinfo/vnfpool


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From: Zongning <zongning@huawei.com>
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Thread-Topic: Updated VNFPool Charter
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--_000_B0D29E0424F2DE47A0B36779EC666779661445F6nkgeml501mbschi_
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Dear all,
Based on the list discussion since we posted the last version, I have made =
some (minor) revision of the charter. The main changes are:

1)       State that service state synchronization is out of scope "in this =
phase";

2)       Include VNF Pool with both virtualized and non-virtualized network=
 function for further study;

3)       Explicitly state that the reference solution & gap analysis is not=
 limited to RSerPool, but open to any other solutions, although no decision=
 on protocols will be made in this phase;

4)       State that the linkage between SFC and VNF Pool is just like a poo=
l user and a pool - nothing specified (yet);

5)       Update bullet #4 under "Questions that are raised...", to keep it =
consistent with the idea that pooling is not visible to the service control=
 entity.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.
The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.
In order to achieve higher reliability, a VNF may adopt a pooling mechanism=
, where a number of VNF instances with the same function can be grouped as =
a pool to provide the function. We call such a pool a VNF Pool.Conceptually=
, a Pool Manager is used to manage a VNF Pool, e.g., selects active/standby=
 VNF instances, and potentially interacts with a service control entity. Su=
ch a service control entity is an entity that orchestrates a set of network=
 functions to build network services. The major benefit of using VNF Pool i=
s that reliability mechanisms such as redundancy model are achieved by the =
VNF Pool inside the VNF and thus not visible to the service control entity.=
 A VNF Pool-enabled VNF still appears as a normal VNF when orchestrated by =
a service control entity.
Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:

*           How to manage the redundancy model, e.g., select active/standby=
 VNF instances in a VNF Pool?

*           What pool states need to be maintained to support the pooling m=
echanism itself, and how are such states maintained?

*           What information is exchanged between a VNF and a service contr=
ol entity? For example, how can a VNF Pool be addressed by the service cont=
rol entity?

*           After a VNF instance failover, how does the Pool Manager notify=
 the service control entity some characteristic changes of the VNF, e.g., c=
apacity change, but without disclosure of the pooling procedure?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool. Additional mechanis=
ms may include pool state maintenance only for pooling purpose. Service sta=
te synchronization is out of scope for this phase. The WG assumes that a VN=
F Pool contains redundant VNF instances of same functional type. Different =
types of VNFs are envisioned to be held in separate VNF Pools. VNF Pool com=
posed by both virtualized and non-virtualized functional instances may be i=
ncluded after further use case and requirements study. The WG will address =
the reliability of an individual VNF, but not the reliability related to th=
e control or the routing between adjacent VNFs that can form a network serv=
ice.
Specifically, the WG will work on the following technical aspects:

*           Redundancy management within a VNF Pool, such as the signaling =
between the Pool Manager and the instances in the pool for instance registr=
ation, backup instances selection, and switching between active and standby=
 instances.

*           The protocol between the Pool Manager and the underlying networ=
k to collect the network information required for appropriate placement/sel=
ection of backup instances.

*           The protocol between a VNF and the service control entity to ex=
change operational information between a VNF Pool and the service control e=
ntity.

*           Identify and analyze reliable interfaces, such as transport pro=
tocol like MPTCP and SCTP for reliable delivery of the messages associated =
with the redundancy management within a VNF Pool.

*           Analysis of pooling security characteristics and requirements t=
o identify and mitigate threats against the pooling mechanism. Identificati=
on of an appropriate trust model between pool members, and between pool mem=
bers and the Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, requiremen=
ts and an architecture covering the aforementioned technical aspects, and a=
pplicability and gap analysis of existing technologies including but not li=
mited to RSerPool. We will rely heavily on existing IETF technologies, but =
that gaps will be found around problems like redundancy mechanisms, state m=
aintenance solely for pooling purposes, reliable transport, and trust/secur=
ity, all of which will need to be considered and addressed. Although no dec=
ision on protocols will be made in this phase, we will keep open for candid=
ate protocols for VNF Pool. The WG will seek re-chartering before adopting =
any work to develop new, or extend existing, protocols.
In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Just like the=
 communication between any pool users and VNF Pool, the information exchang=
ed between the VNF Pool and the SFC may include some operational informatio=
n of the VNF Pool.
Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 an Informational document.
April 2015 - Submit VNFPool Use Cases to IESG for publication as an Informa=
tional document.
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as an Informational document.
August 2015 - Submit VNFPool Architecture to IESG for publication as an Inf=
ormational document.
December 2015 - Submit one or more Applicability and Gap Analysis of existi=
ng protocols to VNFPool to IESG for publication as Informational document(s=
).
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter are ALWAYS highly appreciated!

Thanks.

-Ning

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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple" style=3D"text-justify-t=
rim:punctuation">
<div class=3D"WordSection1">
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
ar all,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ba=
sed on the list discussion since we posted the last version, I have made so=
me (minor) revision of the charter. The main changes are:<o:p></o:p></span>=
</p>
<p class=3D"MsoListParagraphCxSpFirst" style=3D"margin-left:35.85pt;text-in=
dent:-18.0pt;line-height:normal;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">State that service stat=
e synchronization is out of scope &#8220;in this phase&#8221;;<b><o:p></o:p=
></b></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:35.85pt;text-i=
ndent:-18.0pt;line-height:normal;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Include VNF Pool with b=
oth virtualized and non-virtualized network function for further study;<b><=
o:p></o:p></b></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:35.85pt;text-i=
ndent:-18.0pt;line-height:normal;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Explicitly state that t=
he reference solution &amp; gap analysis is not limited to RSerPool, but op=
en to any other solutions, although no decision on protocols will be made i=
n this phase;<b><o:p></o:p></b></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:35.85pt;text-i=
ndent:-18.0pt;line-height:normal;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">State that the linkage =
between SFC and VNF Pool is just like a pool user and a pool &#8211; nothin=
g specified (yet);<b><o:p></o:p></b></span></p>
<p class=3D"MsoListParagraphCxSpLast" style=3D"margin-left:35.85pt;text-ind=
ent:-18.0pt;line-height:normal;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">5=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Update bullet #4 under =
&#8220;Questions that are raised&#8230;&#8221;, to keep it consistent with =
the idea that pooling is not visible to the service control entity.<b><o:p>=
</o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ne=
twork functions such as firewalls, load balancers, and WAN optimizers are c=
onventionally deployed as specialized hardware servers in both network oper=
ators' networks and data center networks
 as the building blocks of the network services. There is a trend to implem=
ent such network functions as software instances running on general purpose=
 servers, via a virtualization layer (i.e., hypervisors). These virtualized=
 functions are called Virtualized
 Network Functions (VNFs), which can be used to build network services.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e use of VNFs introduces additional challenges to the reliability of the pr=
ovided network services. A single VNF instance would typically not have bui=
lt-in reliability mechanisms on its host
 (i.e., a general purpose server). Instead, there are more factors of risk =
such as software failure at various levels including hypervisors and virtua=
l machines, hardware failure, and instance migration that can make a VNF in=
stance unreliable.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">In=
 order to achieve higher reliability, a VNF may adopt a pooling mechanism, =
where a number of VNF instances with the same function can be grouped as a =
pool to provide the function. We call
 such a pool a VNF Pool.</span><span lang=3D"DE">Conceptually, a </span><sp=
an lang=3D"EN-US">Pool Manager is used to manage a VNF Pool, e.g., selects =
active/standby VNF instances, and potentially interacts with a service cont=
rol entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Qu=
estions that are raised by the addition of a pooling mechanism to VNF inclu=
de:<o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpFirst" style=3D"margin-left:24.6pt;text-ind=
ent:-3.6pt;line-height:normal;mso-list:l2 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:24.6pt;text-in=
dent:-3.6pt;line-height:normal;mso-list:l2 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:24.6pt;text-in=
dent:-3.6pt;line-height:normal;mso-list:l2 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpLast" style=3D"margin-left:24.6pt;text-inde=
nt:-3.6pt;line-height:normal;mso-list:l2 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-CA">After a VNF instance fa=
ilover, how does the Pool Manager notify the service control entity some ch=
aracteristic changes of the VNF, e.g., capacity change, but without disclos=
ure of the pooling procedure?</span><span lang=3D"EN-US"><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e WG initially focuses on several reliability mechanisms that are mainly as=
sociated with a redundancy model based on a VNF Pool. Additional mechanisms=
 may include pool state maintenance
</span><span lang=3D"DE">only for pooling purpose. Service state synchroniz=
ation is out of scope for this phase. The WG</span><span lang=3D"EN-US"> as=
sume</span><span lang=3D"DE">s</span><span lang=3D"EN-US"> that a VNF Pool =
contains redundant VNF instances of same
 functional type. </span><span lang=3D"DE">Different types of VNFs are envi=
sioned to be held in separate VNF Pools. VNF Pool composed by both virtuali=
zed and non-virtualized functional instances may be included after further =
use case and requirements study. The
 WG will address the reliability of an individual VNF, but not the reliabil=
ity related
</span><span lang=3D"EN-US">to the control or the routing between adjacent =
VNFs </span>
<span lang=3D"DE">that can form a network service</span><span lang=3D"EN-US=
">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Sp=
ecifically, the WG will work on the following technical aspects:<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraphCxSpFirst" style=3D"margin-left:38.85pt;text-in=
dent:-21.0pt;line-height:normal;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Redundancy management w=
ithin a VNF Pool, such as the signaling between the Pool Manager and the in=
stances in the pool for instance registration, backup instances selection, =
and switching between active and standby
 instances.<o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:38.85pt;text-i=
ndent:-21.0pt;line-height:normal;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between th=
e Pool Manager and the underlying network to collect the network informatio=
n required for appropriate placement/selection of backup instances.<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:38.85pt;text-i=
ndent:-21.0pt;line-height:normal;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between a =
VNF and the service control entity to exchange operational information betw=
een a VNF Pool</span><span lang=3D"DE"> and the service control entity.</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpMiddle" style=3D"margin-left:38.85pt;text-i=
ndent:-21.0pt;line-height:normal;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Identify and analyze re=
liable interfaces, such as transport protocol like MPTCP and SCTP for relia=
ble delivery of the messages associated with the redundancy management with=
in a VNF Pool.<o:p></o:p></span></p>
<p class=3D"MsoListParagraphCxSpLast" style=3D"margin-left:38.85pt;text-ind=
ent:-21.0pt;line-height:normal;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span></span><![endif]><span lang=3D"EN-US">Analysis of pooling sec=
urity characteristics and requirements to identify and mitigate threats aga=
inst the pooling mechanism. Identification of an appropriate trust model be=
tween pool members, and between pool
 members and the Pool Manager.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e WG plans to deliver a problem statement, a set of use cases, requirements=
 and an architecture covering the aforementioned technical aspects, and app=
licability and gap analysis of existing
 technologies including but not limited to RSerPool. We will rely heavily o=
n existing IETF technologies, but that gaps will be found around problems l=
ike redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solel=
y for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. Although no decision on protocols will be made in this=
 phase, we will keep open for candidate protocols for VNF Pool. The WG will=
 seek re-chartering before adopting
 any work to develop new, or extend existing, protocols.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">In=
 particular, we will work closely with the SFC WG, as we believe that SFC a=
nd VNF Pool are independent but complementary.
</span><span lang=3D"EN-US" style=3D"color:black">SFC would essentially see=
 </span><span lang=3D"EN-US" style=3D"color:black">a</span><span lang=3D"EN=
-US" style=3D"color:black"> VNF</span><span lang=3D"EN-US" style=3D"color:b=
lack">
</span><span lang=3D"EN-US" style=3D"color:black">Pool</span><span lang=3D"=
EN-US" style=3D"color:black">-enabled VNF</span><span lang=3D"EN-US" style=
=3D"color:black"> as a
</span><span lang=3D"EN-US" style=3D"color:black">normal </span><span lang=
=3D"EN-US" style=3D"color:black">service function and therefore be able to =
merge it into an SFC just like any other service function</span><span lang=
=3D"EN-US" style=3D"color:black">s. Just like
 the communication between any pool users and VNF Pool, the information exc=
hanged between the VNF Pool and the SFC may include some operational inform=
ation of the VNF Pool.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Go=
als and Milestones:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
cember 2014 - Submit VNFPool Problem Statement to IESG for publication as a=
n Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ap=
ril 2015 - Submit VNFPool Use Cases to IESG for publication as an Informati=
onal document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Au=
gust 2015 - Submit VNFPool Requirements, including the manageability of VNF=
 Pool to IESG for publication as an Informational document.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Au=
gust 2015 - Submit VNFPool Architecture to IESG for publication as an Infor=
mational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
cember 2015 - Submit one or more Applicability and Gap Analysis of existing=
 protocols to VNFPool to IESG for publication as Informational document(s).=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Yo=
ur comments and suggestions to the charter are ALWAYS highly appreciated!<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
anks.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">-N=
ing<o:p></o:p></span></p>
</div>
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From: Zongning <zongning@huawei.com>
To: Melinda Shore <melinda.shore@nomountain.net>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: [vnfpool] BOF approved
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From: Zongning <zongning@huawei.com>
To: "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: Updated VNFPool Charter
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Date: Thu, 12 Jun 2014 03:38:35 +0000
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D">Dear all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D">Please review the charter text included in the last email. We are=
 hoping that a general consensus on the charter could be achieved on the li=
st, then a stable charter is ready for
 the VNFPool session in Toronto.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D">-Ning<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"line-height:150%;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"margin:0cm;margin-bottom:.00=
01pt;text-align:left;line-height:normal">
<b><span style=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=BC=FE=C8=CB<s=
pan lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-si=
ze:10.0pt;font-family:SimSun"> vnfpool [mailto:vnfpool-bounces@ietf.org]
</span><b><span style=3D"font-size:10.0pt;font-family:SimSun">=B4=FA=B1=ED =
</span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:SimSu=
n">Zongning<br>
</span><b><span style=3D"font-size:10.0pt;font-family:SimSun">=B7=A2=CB=CD=
=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:SimSun"> 2014</span><span style=3D"font=
-size:10.0pt;font-family:SimSun">=C4=EA<span lang=3D"EN-US">6</span>=D4=C2<=
span lang=3D"EN-US">12</span>=C8=D5<span lang=3D"EN-US">
 11:20<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> vnfpool@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> [vnfpool] Updated VNFPool Charter<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
ar all,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ba=
sed on the list discussion since we posted the last version, I have made so=
me (minor) revision of the charter. The main changes are:<o:p></o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:35.85pt;text-indent:-18.=
0pt;line-height:normal;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">State that service stat=
e synchronization is out of scope =A1=B0in this phase=A1=B1;<b><o:p></o:p><=
/b></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:35.85pt;text-indent:-18.=
0pt;line-height:normal;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Include VNF Pool with b=
oth virtualized and non-virtualized network function for further study;<b><=
o:p></o:p></b></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:35.85pt;text-indent:-18.=
0pt;line-height:normal;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Explicitly state that t=
he reference solution &amp; gap analysis is not limited to RSerPool, but op=
en to any other solutions, although no decision on protocols will be made i=
n this phase;<b><o:p></o:p></b></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:35.85pt;text-indent:-18.=
0pt;line-height:normal;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">State that the linkage =
between SFC and VNF Pool is just like a pool user and a pool =A8C nothing s=
pecified (yet);<b><o:p></o:p></b></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:35.85pt;text-indent:-18.=
0pt;line-height:normal;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">5=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Update bullet #4 under =
=A1=B0Questions that are raised=A1=AD=A1=B1, to keep it consistent with the=
 idea that pooling is not visible to the service control entity.<b><o:p></o=
:p></b></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ne=
twork functions such as firewalls, load balancers, and WAN optimizers are c=
onventionally deployed as specialized hardware servers in both network oper=
ators' networks and data center networks
 as the building blocks of the network services. There is a trend to implem=
ent such network functions as software instances running on general purpose=
 servers, via a virtualization layer (i.e., hypervisors). These virtualized=
 functions are called Virtualized
 Network Functions (VNFs), which can be used to build network services.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e use of VNFs introduces additional challenges to the reliability of the pr=
ovided network services. A single VNF instance would typically not have bui=
lt-in reliability mechanisms on its host
 (i.e., a general purpose server). Instead, there are more factors of risk =
such as software failure at various levels including hypervisors and virtua=
l machines, hardware failure, and instance migration that can make a VNF in=
stance unreliable.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">In=
 order to achieve higher reliability, a VNF may adopt a pooling mechanism, =
where a number of VNF instances with the same function can be grouped as a =
pool to provide the function. We call
 such a pool a VNF Pool.</span><span lang=3D"DE">Conceptually, a </span><sp=
an lang=3D"EN-US">Pool Manager is used to manage a VNF Pool, e.g., selects =
active/standby VNF instances, and potentially interacts with a service cont=
rol entity.
</span><span lang=3D"DE">Such a </span><span lang=3D"EN-US">service control=
 entity is an entity that orchestrates a set of network functions to build =
network services. The major benefit of using VNF Pool is that reliability m=
echanisms such as redundancy model are
 achieved by the VNF Pool inside the VNF and thus not visible to the servic=
e control entity. A VNF Pool-enabled VNF still appears as a normal VNF when=
 orchestrated by
</span><span lang=3D"DE">a </span><span lang=3D"EN-US">service control enti=
ty.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Qu=
estions that are raised by the addition of a pooling mechanism to VNF inclu=
de:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:24.6pt;text-indent:-3.6p=
t;line-height:normal;mso-list:l2 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">How to manage the redun=
dancy model, e.g., select active/standby VNF instances in a VNF Pool?<o:p><=
/o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:24.6pt;text-indent:-3.6p=
t;line-height:normal;mso-list:l2 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What pool states need t=
o be maintained to support the pooling mechanism itself, and how are such s=
tates maintained?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:24.6pt;text-indent:-3.6p=
t;line-height:normal;mso-list:l2 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">What information is exc=
hanged between a VNF and a service control entity? For example, how can a V=
NF Pool be addressed by the service control entity?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:24.6pt;text-indent:-3.6p=
t;line-height:normal;mso-list:l2 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-CA">After a VNF instance fa=
ilover, how does the Pool Manager notify the service control entity some ch=
aracteristic changes of the VNF, e.g., capacity change, but without disclos=
ure of the pooling procedure?</span><span lang=3D"EN-US"><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e WG initially focuses on several reliability mechanisms that are mainly as=
sociated with a redundancy model based on a VNF Pool. Additional mechanisms=
 may include pool state maintenance
</span><span lang=3D"DE">only for pooling purpose. Service state synchroniz=
ation is out of scope for this phase. The WG</span><span lang=3D"EN-US"> as=
sume</span><span lang=3D"DE">s</span><span lang=3D"EN-US"> that a VNF Pool =
contains redundant VNF instances of same
 functional type. </span><span lang=3D"DE">Different types of VNFs are envi=
sioned to be held in separate VNF Pools. VNF Pool composed by both virtuali=
zed and non-virtualized functional instances may be included after further =
use case and requirements study. The
 WG will address the reliability of an individual VNF, but not the reliabil=
ity related
</span><span lang=3D"EN-US">to the control or the routing between adjacent =
VNFs </span>
<span lang=3D"DE">that can form a network service</span><span lang=3D"EN-US=
">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Sp=
ecifically, the WG will work on the following technical aspects:<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.85pt;text-indent:-21.=
0pt;line-height:normal;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Redundancy management w=
ithin a VNF Pool, such as the signaling between the Pool Manager and the in=
stances in the pool for instance registration, backup instances selection, =
and switching between active and standby
 instances.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.85pt;text-indent:-21.=
0pt;line-height:normal;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between th=
e Pool Manager and the underlying network to collect the network informatio=
n required for appropriate placement/selection of backup instances.<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.85pt;text-indent:-21.=
0pt;line-height:normal;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The protocol between a =
VNF and the service control entity to exchange operational information betw=
een a VNF Pool</span><span lang=3D"DE"> and the service control entity.</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.85pt;text-indent:-21.=
0pt;line-height:normal;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Identify and analyze re=
liable interfaces, such as transport protocol like MPTCP and SCTP for relia=
ble delivery of the messages associated with the redundancy management with=
in a VNF Pool.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.85pt;text-indent:-21.=
0pt;line-height:normal;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Analysis of pooling sec=
urity characteristics and requirements to identify and mitigate threats aga=
inst the pooling mechanism. Identification of an appropriate trust model be=
tween pool members, and between pool
 members and the Pool Manager.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
e WG plans to deliver a problem statement, a set of use cases, requirements=
 and an architecture covering the aforementioned technical aspects, and app=
licability and gap analysis of existing
 technologies including but not limited to RSerPool. We will rely heavily o=
n existing IETF technologies, but that gaps will be found around problems l=
ike redundancy mechanisms, state maintenance</span><span lang=3D"DE"> solel=
y for pooling purposes</span><span lang=3D"EN-US">,
 reliable transport, and trust/security, all of which will need to be consi=
dered and addressed. Although no decision on protocols will be made in this=
 phase, we will keep open for candidate protocols for VNF Pool. The WG will=
 seek re-chartering before adopting
 any work to develop new, or extend existing, protocols.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">In=
 particular, we will work closely with the SFC WG, as we believe that SFC a=
nd VNF Pool are independent but complementary.
<span style=3D"color:black">SFC would essentially see a VNF Pool-enabled VN=
F as a normal service function and therefore be able to merge it into an SF=
C just like any other service functions. Just like the communication betwee=
n any pool users and VNF Pool, the
 information exchanged between the VNF Pool and the SFC may include some op=
erational information of the VNF Pool.</span><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Go=
als and Milestones:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
cember 2014 - Submit VNFPool Problem Statement to IESG for publication as a=
n Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Ap=
ril 2015 - Submit VNFPool Use Cases to IESG for publication as an Informati=
onal document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Au=
gust 2015 - Submit VNFPool Requirements, including the manageability of VNF=
 Pool to IESG for publication as an Informational document.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Au=
gust 2015 - Submit VNFPool Architecture to IESG for publication as an Infor=
mational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">De=
cember 2015 - Submit one or more Applicability and Gap Analysis of existing=
 protocols to VNFPool to IESG for publication as Informational document(s).=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Yo=
ur comments and suggestions to the charter are ALWAYS highly appreciated!<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">Th=
anks.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:normal"><span lang=3D"EN-US">-N=
ing<o:p></o:p></span></p>
</div>
</body>
</html>

--_000_B0D29E0424F2DE47A0B36779EC66677966144627nkgeml501mbschi_--


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From nobody Mon Jun 16 07:58:59 2014
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From: Hidetoshi Yokota <yokota@kddilabs.jp>
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Subject: Re: [vnfpool] Updated VNFPool Charter
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Dear Ning,

Thanks a lot for updating the charter and congratulations on BoF 
approval! Allow me to ask a couple of clarification questions.

o Could you clarify what "service state synchronization" is and why it 
is out of scope in this phase?
- Does this service state include "networking service"? If so, 
active/active redundancy cannot maintain the state information in, for 
example, virtual routers any more, which would be a significant degrade 
from the current physical networks.
- What is the relationship between service state synchronization and 
pool state maintenance?

2) Is the service control entity the NFV Orchestrator or VNF Manager or 
none of them in NFV terminolgy?

3) In the last paragraph just before Goals and Milestones, it says, "the 
information exchanged between the VNF Pool and the SFC may..." If some 
information is exchanged between them, they are not independent any 
more, which would contradict the first sentence of this paragraph.

Could you clarify a bit more on them please?

Regards,

-- 
Hidetoshi Yokota

KDDI R&D Laboratories, Inc.
e-mail:yokota@kddilabs.jp

(2014/06/12 12:19), Zongning wrote:
>
> Dear all,
>
> Based on the list discussion since we posted the last version, I have 
> made some (minor) revision of the charter. The main changes are:
>
> 1)State that service state synchronization is out of scope “in this 
> phase”;**
>
> 2)Include VNF Pool with both virtualized and non-virtualized network 
> function for further study;**
>
> 3)Explicitly state that the reference solution & gap analysis is not 
> limited to RSerPool, but open to any other solutions, although no 
> decision on protocols will be made in this phase;**
>
> 4)State that the linkage between SFC and VNF Pool is just like a pool 
> user and a pool – nothing specified (yet);**
>
> 5)Update bullet #4 under “Questions that are raised…”, to keep it 
> consistent with the idea that pooling is not visible to the service 
> control entity.**
>
> ==========================================================================
>
> Network functions such as firewalls, load balancers, and WAN 
> optimizers are conventionally deployed as specialized hardware servers 
> in both network operators' networks and data center networks as the 
> building blocks of the network services. There is a trend to implement 
> such network functions as software instances running on general 
> purpose servers, via a virtualization layer (i.e., hypervisors). These 
> virtualized functions are called Virtualized Network Functions (VNFs), 
> which can be used to build network services.
>
> The use of VNFs introduces additional challenges to the reliability of 
> the provided network services. A single VNF instance would typically 
> not have built-in reliability mechanisms on its host (i.e., a general 
> purpose server). Instead, there are more factors of risk such as 
> software failure at various levels including hypervisors and virtual 
> machines, hardware failure, and instance migration that can make a VNF 
> instance unreliable.
>
> In order to achieve higher reliability, a VNF may adopt a pooling 
> mechanism, where a number of VNF instances with the same function can 
> be grouped as a pool to provide the function. We call such a pool a 
> VNF Pool.Conceptually, a Pool Manager is used to manage a VNF Pool, 
> e.g., selects active/standby VNF instances, and potentially interacts 
> with a service control entity. Such a service control entity is an 
> entity that orchestrates a set of network functions to build network 
> services. The major benefit of using VNF Pool is that reliability 
> mechanisms such as redundancy model are achieved by the VNF Pool 
> inside the VNF and thus not visible to the service control entity. A 
> VNF Pool-enabled VNF still appears as a normal VNF when orchestrated 
> by a service control entity.
>
> Questions that are raised by the addition of a pooling mechanism to 
> VNF include:
>
> ·How to manage the redundancy model, e.g., select active/standby VNF 
> instances in a VNF Pool?
>
> ·What pool states need to be maintained to support the pooling 
> mechanism itself, and how are such states maintained?
>
> ·What information is exchanged between a VNF and a service control 
> entity? For example, how can a VNF Pool be addressed by the service 
> control entity?
>
> ·After a VNF instance failover, how does the Pool Manager notify the 
> service control entity some characteristic changes of the VNF, e.g., 
> capacity change, but without disclosure of the pooling procedure?
>
> The WG initially focuses on several reliability mechanisms that are 
> mainly associated with a redundancy model based on a VNF Pool. 
> Additional mechanisms may include pool state maintenance only for 
> pooling purpose. Service state synchronization is out of scope for 
> this phase. The WGassumesthat a VNF Pool contains redundant VNF 
> instances of same functional type. Different types of VNFs are 
> envisioned to be held in separate VNF Pools. VNF Pool composed by both 
> virtualized and non-virtualized functional instances may be included 
> after further use case and requirements study. The WG will address the 
> reliability of an individual VNF, but not the reliability related to 
> the control or the routing between adjacent VNFs that can form a 
> network service.
>
> Specifically, the WG will work on the following technical aspects:
>
> ·Redundancy management within a VNF Pool, such as the signaling 
> between the Pool Manager and the instances in the pool for instance 
> registration, backup instances selection, and switching between active 
> and standby instances.
>
> ·The protocol between the Pool Manager and the underlying network to 
> collect the network information required for appropriate 
> placement/selection of backup instances.
>
> ·The protocol between a VNF and the service control entity to exchange 
> operational information between a VNF Pooland the service control entity.
>
> ·Identify and analyze reliable interfaces, such as transport protocol 
> like MPTCP and SCTP for reliable delivery of the messages associated 
> with the redundancy management within a VNF Pool.
>
> ·Analysis of pooling security characteristics and requirements to 
> identify and mitigate threats against the pooling mechanism. 
> Identification of an appropriate trust model between pool members, and 
> between pool members and the Pool Manager.
>
> The WG plans to deliver a problem statement, a set of use cases, 
> requirements and an architecture covering the aforementioned technical 
> aspects, and applicability and gap analysis of existing technologies 
> including but not limited to RSerPool. We will rely heavily on 
> existing IETF technologies, but that gaps will be found around 
> problems like redundancy mechanisms, state maintenancesolely for 
> pooling purposes, reliable transport, and trust/security, all of which 
> will need to be considered and addressed. Although no decision on 
> protocols will be made in this phase, we will keep open for candidate 
> protocols for VNF Pool. The WG will seek re-chartering before adopting 
> any work to develop new, or extend existing, protocols.
>
> In particular, we will work closely with the SFC WG, as we believe 
> that SFC and VNF Pool are independent but complementary. SFC would 
> essentially see aVNFPool-enabled VNFas a normal service function and 
> therefore be able to merge it into an SFC just like any other service 
> functions. Just like the communication between any pool users and VNF 
> Pool, the information exchanged between the VNF Pool and the SFC may 
> include some operational information of the VNF Pool.
>
> Goals and Milestones:
>
> December 2014 - Submit VNFPool Problem Statement to IESG for 
> publication as an Informational document.
>
> April 2015 - Submit VNFPool Use Cases to IESG for publication as an 
> Informational document.
>
> August 2015 - Submit VNFPool Requirements, including the manageability 
> of VNF Pool to IESG for publication as an Informational document.
>
> August 2015 - Submit VNFPool Architecture to IESG for publication as 
> an Informational document.
>
> December 2015 - Submit one or more Applicability and Gap Analysis of 
> existing protocols to VNFPool to IESG for publication as Informational 
> document(s).
>
> ==========================================================================
>
> Your comments and suggestions to the charter are ALWAYS highly 
> appreciated!
>
> Thanks.
>
> -Ning
>
>
>
> _______________________________________________
> vnfpool mailing list
> vnfpool@ietf.org
> https://www.ietf.org/mailman/listinfo/vnfpool



From nobody Mon Jun 16 10:51:48 2014
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From: "Sood, Kapil" <kapil.sood@intel.com>
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Thread-Topic: comments on VNF Pool Charter
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--_000_7B96B1DAA4CC63459FB0B17038C6A4744F9657D9ORSMSX102amrcor_
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Hello All,

A couple comments, maybe questions, on the VNF Charter:

1.      The point below indicates =1B$B!H=1B(Bto collect network informatio=
n=1B$B!I!D=1B(Bdid you consider collecting the platform information as well=
?  I would suggest to add that.

2.      Please clarify the scope of the protocols work within the charter. =
 Current text says =1B$B!H=1B(Bre-chartering before adopting any work to de=
velop new, or extend existing, protocols=1B$B!I=1B(B.  But, it also says th=
at group will work on 2 protocols.

Best Regards,

Kapil.

Dear all,
Based on the list discussion since we posted the last version, I have made =
some (minor) revision of the charter. The main changes are:
1)       State that service state synchronization is out of scope =1B$B!H=
=1B(Bin this phase=1B$B!I=1B(B;
2)       Include VNF Pool with both virtualized and non-virtualized network=
 function for further study;
3)       Explicitly state that the reference solution & gap analysis is not=
 limited to RSerPool, but open to any other solutions, although no decision=
 on protocols will be made in this phase;
4)       State that the linkage between SFC and VNF Pool is just like a poo=
l user and a pool ? nothing specified (yet);
5)       Update bullet #4 under =1B$B!H=1B(BQuestions that are raised=1B$B!=
D!I=1B(B, to keep it consistent with the idea that pooling is not visible t=
o the service control entity.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Network functions such as firewalls, load balancers, and WAN optimizers are=
 conventionally deployed as specialized hardware servers in both network op=
erators' networks and data center networks as the building blocks of the ne=
twork services. There is a trend to implement such network functions as sof=
tware instances running on general purpose servers, via a virtualization la=
yer (i.e., hypervisors). These virtualized functions are called Virtualized=
 Network Functions (VNFs), which can be used to build network services.
The use of VNFs introduces additional challenges to the reliability of the =
provided network services. A single VNF instance would typically not have b=
uilt-in reliability mechanisms on its host (i.e., a general purpose server)=
. Instead, there are more factors of risk such as software failure at vario=
us levels including hypervisors and virtual machines, hardware failure, and=
 instance migration that can make a VNF instance unreliable.
In order to achieve higher reliability, a VNF may adopt a pooling mechanism=
, where a number of VNF instances with the same function can be grouped as =
a pool to provide the function. We call such a pool a VNF Pool.Conceptually=
, a Pool Manager is used to manage a VNF Pool, e.g., selects active/standby=
 VNF instances, and potentially interacts with a service control entity. Su=
ch a service control entity is an entity that orchestrates a set of network=
 functions to build network services. The major benefit of using VNF Pool i=
s that reliability mechanisms such as redundancy model are achieved by the =
VNF Pool inside the VNF and thus not visible to the service control entity.=
 A VNF Pool-enabled VNF still appears as a normal VNF when orchestrated by =
a service control entity.
Questions that are raised by the addition of a pooling mechanism to VNF inc=
lude:
*           How to manage the redundancy model, e.g., select active/standby=
 VNF instances in a VNF Pool?
*           What pool states need to be maintained to support the pooling m=
echanism itself, and how are such states maintained?
*           What information is exchanged between a VNF and a service contr=
ol entity? For example, how can a VNF Pool be addressed by the service cont=
rol entity?
*           After a VNF instance failover, how does the Pool Manager notify=
 the service control entity some characteristic changes of the VNF, e.g., c=
apacity change, but without disclosure of the pooling procedure?
The WG initially focuses on several reliability mechanisms that are mainly =
associated with a redundancy model based on a VNF Pool. Additional mechanis=
ms may include pool state maintenance only for pooling purpose. Service sta=
te synchronization is out of scope for this phase. The WG assumes that a VN=
F Pool contains redundant VNF instances of same functional type. Different =
types of VNFs are envisioned to be held in separate VNF Pools. VNF Pool com=
posed by both virtualized and non-virtualized functional instances may be i=
ncluded after further use case and requirements study. The WG will address =
the reliability of an individual VNF, but not the reliability related to th=
e control or the routing between adjacent VNFs that can form a network serv=
ice.
Specifically, the WG will work on the following technical aspects:
*           Redundancy management within a VNF Pool, such as the signaling =
between the Pool Manager and the instances in the pool for instance registr=
ation, backup instances selection, and switching between active and standby=
 instances.
*           The protocol between the Pool Manager and the underlying networ=
k to collect the network information required for appropriate placement/sel=
ection of backup instances.
*           The protocol between a VNF and the service control entity to ex=
change operational information between a VNF Pool and the service control e=
ntity.
*           Identify and analyze reliable interfaces, such as transport pro=
tocol like MPTCP and SCTP for reliable delivery of the messages associated =
with the redundancy management within a VNF Pool.
*           Analysis of pooling security characteristics and requirements t=
o identify and mitigate threats against the pooling mechanism. Identificati=
on of an appropriate trust model between pool members, and between pool mem=
bers and the Pool Manager.
The WG plans to deliver a problem statement, a set of use cases, requiremen=
ts and an architecture covering the aforementioned technical aspects, and a=
pplicability and gap analysis of existing technologies including but not li=
mited to RSerPool. We will rely heavily on existing IETF technologies, but =
that gaps will be found around problems like redundancy mechanisms, state m=
aintenance solely for pooling purposes, reliable transport, and trust/secur=
ity, all of which will need to be considered and addressed. Although no dec=
ision on protocols will be made in this phase, we will keep open for candid=
ate protocols for VNF Pool. The WG will seek re-chartering before adopting =
any work to develop new, or extend existing, protocols.
In particular, we will work closely with the SFC WG, as we believe that SFC=
 and VNF Pool are independent but complementary. SFC would essentially see =
a VNF Pool-enabled VNF as a normal service function and therefore be able t=
o merge it into an SFC just like any other service functions. Just like the=
 communication between any pool users and VNF Pool, the information exchang=
ed between the VNF Pool and the SFC may include some operational informatio=
n of the VNF Pool.
Goals and Milestones:
December 2014 - Submit VNFPool Problem Statement to IESG for publication as=
 an Informational document.
April 2015 - Submit VNFPool Use Cases to IESG for publication as an Informa=
tional document.
August 2015 - Submit VNFPool Requirements, including the manageability of V=
NF Pool to IESG for publication as an Informational document.
August 2015 - Submit VNFPool Architecture to IESG for publication as an Inf=
ormational document.
December 2015 - Submit one or more Applicability and Gap Analysis of existi=
ng protocols to VNFPool to IESG for publication as Informational document(s=
).
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Your comments and suggestions to the charter are ALWAYS highly appreciated!

Thanks.

-Ning


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">Hello All,<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">A couple comments,=
 maybe questions, on the VNF Charter:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"font-size:12.0pt;font-family:&q=
uot;Neo Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000"><span style=
=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:12.0pt;font-family:=
&quot;Neo Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">The point =
below indicates =1B$B!H=1B(Bto collect network information=1B$B!I!D=1B(Bdid=
 you consider collecting the platform information as well?&nbsp; I would su=
ggest to
 add that.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"font-size:12.0pt;font-family:&q=
uot;Neo Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000"><span style=
=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-size:12.0pt;font-family:=
&quot;Neo Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">Please cla=
rify the scope of the protocols work within the charter.&nbsp; Current text=
 says =1B$B!H=1B(Bre-chartering before adopting any work to develop new,
 or extend existing, protocols=1B$B!I=1B(B.&nbsp; But, it also says that gr=
oup will work on 2 protocols.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">Best Regards,<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ne=
o Sans Intel&quot;,&quot;sans-serif&quot;;color:#C00000">Kapil.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Dear all,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Based on the list discussion since we posted the l=
ast version, I have made some (minor) revision of the charter.
 The main changes are:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:35.85pt;text-indent:-.25in">
<span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&qu=
ot;serif&quot;">1)</span><span style=3D"font-size:7.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">State that service state synchronization is out of s=
cope =1B$B!H=1B(Bin this phase=1B$B!I=1B(B;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:35.85pt;text-indent:-.25in">
<span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&qu=
ot;serif&quot;">2)</span><span style=3D"font-size:7.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Include VNF Pool with both virtualized and non-virtu=
alized network function for further study;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:35.85pt;text-indent:-.25in">
<span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&qu=
ot;serif&quot;">3)</span><span style=3D"font-size:7.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Explicitly state that the reference solution &amp; g=
ap analysis is not limited to RSerPool, but open to any other solutions, al=
though no decision on protocols will be made in this phase;<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:35.85pt;text-indent:-.25in">
<span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&qu=
ot;serif&quot;">4)</span><span style=3D"font-size:7.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">State that the linkage between SFC and VNF Pool is j=
ust like a pool user and a pool ? nothing specified (yet);<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:35.85pt;text-indent:-.25in">
<span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&qu=
ot;serif&quot;">5)</span><span style=3D"font-size:7.0pt;font-family:&quot;T=
imes New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Update bullet #4 under =1B$B!H=1B(BQuestions that ar=
e raised=1B$B!D!I=1B(B, to keep it consistent with the idea that pooling is=
 not visible to the service control entity.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Network functions such as firewalls, load balancer=
s, and WAN optimizers are conventionally deployed as specialized
 hardware servers in both network operators' networks and data center netwo=
rks as the building blocks of the network services. There is a trend to imp=
lement such network functions as software instances running on general purp=
ose servers, via a virtualization
 layer (i.e., hypervisors). These virtualized functions are called Virtuali=
zed Network Functions (VNFs), which can be used to build network services.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">The use of VNFs introduces additional challenges t=
o the reliability of the provided network services. A single
 VNF instance would typically not have built-in reliability mechanisms on i=
ts host (i.e., a general purpose server). Instead, there are more factors o=
f risk such as software failure at various levels including hypervisors and=
 virtual machines, hardware failure,
 and instance migration that can make a VNF instance unreliable.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">In order to achieve higher reliability, a VNF may =
adopt a pooling mechanism, where a number of VNF instances
 with the same function can be grouped as a pool to provide the function. W=
e call such a pool a VNF Pool.</span><span lang=3D"DE" style=3D"font-size:1=
2.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Conceptual=
ly, a
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Pool Manager is used to manage a VNF Pool, e.g., sel=
ects active/standby VNF instances, and potentially interacts with a service=
 control entity.
</span><span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,&quot;serif&quot;">Such a
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">service control entity is an entity that orchestrate=
s a set of network functions to build network services. The major benefit o=
f using VNF Pool is that reliability mechanisms such as
 redundancy model are achieved by the VNF Pool inside the VNF and thus not =
visible to the service control entity. A VNF Pool-enabled VNF still appears=
 as a normal VNF when orchestrated by
</span><span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,&quot;serif&quot;">a
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">service control entity.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Questions that are raised by the addition of a poo=
ling mechanism to VNF include:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:24.6pt;text-indent:-.05in">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">How to manage the redundancy model, e.g., select act=
ive/standby VNF instances in a VNF Pool?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:24.6pt;text-indent:-.05in">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">What pool states need to be maintained to support th=
e pooling mechanism itself, and how are such states maintained?<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:24.6pt;text-indent:-.05in">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">What information is exchanged between a VNF and a se=
rvice control entity? For example, how can a VNF Pool be addressed by the s=
ervice control entity?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:24.6pt;text-indent:-.05in">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=3D"EN-CA" style=3D"font-size:12.0pt;font-family:&quot;Tim=
es New Roman&quot;,&quot;serif&quot;">After a VNF instance failover, how do=
es the Pool Manager notify the service control entity some characteristic c=
hanges of the VNF, e.g., capacity change, but without disclosure
 of the pooling procedure?</span><span style=3D"font-size:12.0pt;font-famil=
y:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">The WG initially focuses on several reliability me=
chanisms that are mainly associated with a redundancy model
 based on a VNF Pool. Additional mechanisms may include pool state maintena=
nce </span>
<span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;">only for pooling purpose. Service state synchro=
nization is out of scope for this phase. The WG</span><span style=3D"font-s=
ize:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"> assu=
me</span><span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Time=
s New Roman&quot;,&quot;serif&quot;">s</span><span style=3D"font-size:12.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">
 that a VNF Pool contains redundant VNF instances of same functional type. =
</span>
<span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;">Different types of VNFs are envisioned to be he=
ld in separate VNF Pools. VNF Pool composed by both virtualized and non-vir=
tualized functional instances may be included after further
 use case and requirements study. The WG will address the reliability of an=
 individual VNF, but not the reliability related
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">to the control or the routing between adjacent VNFs
</span><span lang=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,&quot;serif&quot;">that can form a network service</span><s=
pan style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&quot=
;serif&quot;">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Specifically, the WG will work on the following te=
chnical aspects:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:38.85pt;text-indent:-21.0pt">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Redundancy management within a VNF Pool, such as the=
 signaling between the Pool Manager and the instances in the pool for insta=
nce registration, backup instances selection, and switching
 between active and standby instances.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:38.85pt;text-indent:-21.0pt">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">The protocol between the Pool Manager and the underl=
ying network to collect the network information required for appropriate pl=
acement/selection of backup instances.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:38.85pt;text-indent:-21.0pt">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">The protocol between a VNF and the service control e=
ntity to exchange operational information between a VNF Pool</span><span la=
ng=3D"DE" style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;=
,&quot;serif&quot;">
 and the service control entity.</span><span style=3D"font-size:12.0pt;font=
-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:38.85pt;text-indent:-21.0pt">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Identify and analyze reliable interfaces, such as tr=
ansport protocol like MPTCP and SCTP for reliable delivery of the messages =
associated with the redundancy management within a VNF
 Pool.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;margin-left:38.85pt;text-indent:-21.0pt">
<span style=3D"font-size:12.0pt;font-family:Symbol">=1B$B!&=1B(B</span><spa=
n style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;">Analysis of pooling security characteristics and req=
uirements to identify and mitigate threats against the pooling mechanism. I=
dentification of an appropriate trust model between pool
 members, and between pool members and the Pool Manager.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">The WG plans to deliver a problem statement, a set=
 of use cases, requirements and an architecture covering the
 aforementioned technical aspects, and applicability and gap analysis of ex=
isting technologies including but not limited to RSerPool. We will rely hea=
vily on existing IETF technologies, but that gaps will be found around prob=
lems like redundancy mechanisms,
 state maintenance</span><span lang=3D"DE" style=3D"font-size:12.0pt;font-f=
amily:&quot;Times New Roman&quot;,&quot;serif&quot;"> solely for pooling pu=
rposes</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;">, reliable transport, and trust/security, all =
of
 which will need to be considered and addressed. Although no decision on pr=
otocols will be made in this phase, we will keep open for candidate protoco=
ls for VNF Pool. The WG will seek re-chartering before adopting any work to=
 develop new, or extend existing,
 protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">In particular, we will work closely with the SFC W=
G, as we believe that SFC and VNF Pool are independent but
 complementary. <span style=3D"color:black">SFC would essentially see a VNF=
 Pool-enabled VNF as a normal service function and therefore be able to mer=
ge it into an SFC just like any other service functions. Just like the comm=
unication between any pool users and
 VNF Pool, the information exchanged between the VNF Pool and the SFC may i=
nclude some operational information of the VNF Pool.</span><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Goals and Milestones:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">December 2014 - Submit VNFPool Problem Statement t=
o IESG for publication as an Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">April 2015 - Submit VNFPool Use Cases to IESG for =
publication as an Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">August 2015 - Submit VNFPool Requirements, includi=
ng the manageability of VNF Pool to IESG for publication as
 an Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">August 2015 - Submit VNFPool Architecture to IESG =
for publication as an Informational document.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">December 2015 - Submit one or more Applicability a=
nd Gap Analysis of existing protocols to VNFPool to IESG for
 publication as Informational document(s).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Your comments and suggestions to the charter are A=
LWAYS highly appreciated!<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">-Ning<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_7B96B1DAA4CC63459FB0B17038C6A4744F9657D9ORSMSX102amrcor_--


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Thread-Topic: [vnfpool] Updated VNFPool Charter
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From: Zongning <zongning@huawei.com>
To: "Sood, Kapil" <kapil.sood@intel.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: comments on VNF Pool Charter
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From: "Sood, Kapil" <kapil.sood@intel.com>
To: Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: comments on VNF Pool Charter
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From: Zongning <zongning@huawei.com>
To: "Sood, Kapil" <kapil.sood@intel.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: comments on VNF Pool Charter
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Hi Ning,
1) Is it exact that scaling out/in, one main characteristic of VNFs 
(compared to PNFs), is not included ?
2) Some comments/suggestions are enclosed.
Best,
Chidung

Le 12/06/2014 05:38, Zongning a écrit :
>
> Dear all,
> Please review the charter text included in the last email. We are 
> hoping that a general consensus on the charter could be achieved on 
> the list, then a stable charter is ready for the VNFPool session in 
> Toronto.
> Thanks.
> -Ning
>
> *发件人:*vnfpool [mailto:vnfpool-bounces@ietf.org] *代表 *Zongning
> *发送时间:*2014年6月12日11:20
> *收件人:*vnfpool@ietf.org
> *主题:*[vnfpool] Updated VNFPool Charter
>
> Dear all,
>
> Based on the list discussion since we posted the last version, I have 
> made some (minor) revision of the charter. The main changes are:
>
> 1)State that service state synchronization is out of scope “in this 
> phase”;**
>
> 2)Include VNF Pool with both virtualized and non-virtualized network 
> function for further study;**
>
> 3)Explicitly state that the reference solution & gap analysis is not 
> limited to RSerPool, but open to any other solutions, although no 
> decision on protocols will be made in this phase;**
>
> 4)State that the linkage between SFC and VNF Pool is just like a pool 
> user and a pool – nothing specified (yet);**
>
> 5)Update bullet #4 under “Questions that are raised…”, to keep it 
> consistent with the idea that pooling is not visible to the service 
> control entity.**
>
> ==========================================================================
>
> Network functions such as firewalls, load balancers, and WAN 
> optimizers are conventionally deployed as specialized hardware servers 
> in both network operators' networks and data center networks as the 
> building blocks of the network services. There is a trend to implement 
> such network functions as software instances running on general 
> purpose servers, via a virtualization layer (i.e., hypervisors). These 
> virtualized functions are called Virtualized Network Functions (VNFs), 
> which can be used to build network services.
>
> The use of VNFs introduces additional challenges to the reliability of 
> the provided network services. A single VNF instance would typically 
> not have built-in reliability mechanisms on its host (i.e., a general 
> purpose server). Instead, there are more factors of risk such as 
> software failure at various levels including hypervisors and virtual 
> machines, hardware failure, and instance migration that can make a VNF 
> instance unreliable.
>
> In order to achieve higher reliability, a VNF may adopt a pooling 
> mechanism, where a number of VNF instances with the same function can 
> be grouped as a pool to provide the function. We call such a pool a 
> VNF Pool.Conceptually, a Pool Manager is used to manage a VNF Pool, 
> e.g., selects active/standby VNF instances, and potentially interacts 
> with a service control entity. Such a service control entity is an 
> entity that orchestrates a set of network functions to build network 
> services. The major benefit of using VNF Pool is that reliability 
> mechanisms such as redundancy model are achieved by the VNF Pool 
> inside the VNF and thus not visible to the service control entity. A 
> VNF Pool-enabled VNF still appears as a normal VNF when orchestrated 
> by a service control entity.
>
> Questions that are raised by the addition of a pooling mechanism to 
> VNF include:
>
> ·How to manage the redundancy model, e.g., select active/standby VNF 
> instances in a VNF Pool?
>
> ·What pool states need to be maintained to support the pooling 
> mechanism itself, and how are such states maintained?
>
> ·What information is exchanged between a VNF and a service control 
> entity? For example, how can a VNF Pool be addressed by the service 
> control entity?
>
> ·After a VNF instance failover, how does the Pool Manager notify the 
> service control entity some characteristic changes of the VNF, e.g., 
> capacity change, but without disclosure of the pooling procedure?
>
> The WG initially focuses on several reliability mechanisms that are 
> mainly associated with a redundancy model based on a VNF Pool. 
> Additional mechanisms may include pool state maintenance only for 
> pooling purpose. Service state synchronization is out of scope for 
> this phase. The WGassumesthat a VNF Pool contains redundant VNF 
> instances of same functional type. Different types of VNFs are 
> envisioned to be held in separate VNF Pools. VNF Pool composed by both 
> virtualized and non-virtualized functional instances may be included 
> after further use case and requirements study. The WG will address the 
> reliability of an individual VNF, but not the reliability related to 
> the control or the routing between adjacent VNFs that can form a 
> network service.
>
> Specifically, the WG will work on the following technical aspects:
>
> ·Redundancy management within a VNF Pool, such as the signaling 
> between the Pool Manager and the instances in the pool for instance 
> registration, backup instances selection, and switching between active 
> and standby instances.
>
> ·The protocol between the Pool Manager and the underlying network to 
> collect the network information required for appropriate 
> placement/selection of backup instances.
>
> ·The protocol between a VNF and the service control entity to exchange 
> operational information between a VNF Pooland the service control entity.
>
> ·Identify and analyze reliable interfaces, such as transport protocol 
> like MPTCP and SCTP for reliable delivery of the messages associated 
> with the redundancy management within a VNF Pool.
>
> ·Analysis of pooling security characteristics and requirements to 
> identify and mitigate threats against the pooling mechanism. 
> Identification of an appropriate trust model between pool members, and 
> between pool members and the Pool Manager.
>
> The WG plans to deliver a problem statement, a set of use cases, 
> requirements and an architecture covering the aforementioned technical 
> aspects, and applicability and gap analysis of existing technologies 
> including but not limited to RSerPool. We will rely heavily on 
> existing IETF technologies, but that gaps will be found around 
> problems like redundancy mechanisms, state maintenancesolely for 
> pooling purposes, reliable transport, and trust/security, all of which 
> will need to be considered and addressed. Although no decision on 
> protocols will be made in this phase, we will keep open for candidate 
> protocols for VNF Pool. The WG will seek re-chartering before adopting 
> any work to develop new, or extend existing, protocols.
>
> In particular, we will work closely with the SFC WG, as we believe 
> that SFC and VNF Pool are independent but complementary. SFC would 
> essentially see a VNF Pool-enabled VNF as a normal service function 
> and therefore be able to merge it into an SFC just like any other 
> service functions. Just like the communication between any pool users 
> and VNF Pool, the information exchanged between the VNF Pool and the 
> SFC may include some operational information of the VNF Pool.
>
> Goals and Milestones:
>
> December 2014 - Submit VNFPool Problem Statement to IESG for 
> publication as an Informational document.
>
> April 2015 - Submit VNFPool Use Cases to IESG for publication as an 
> Informational document.
>
> August 2015 - Submit VNFPool Requirements, including the manageability 
> of VNF Pool to IESG for publication as an Informational document.
>
> August 2015 - Submit VNFPool Architecture to IESG for publication as 
> an Informational document.
>
> December 2015 - Submit one or more Applicability and Gap Analysis of 
> existing protocols to VNFPool to IESG for publication as Informational 
> document(s).
>
> ==========================================================================
>
> Your comments and suggestions to the charter are ALWAYS highly 
> appreciated!
>
> Thanks.
>
> -Ning
>
>
>
> _______________________________________________
> vnfpool mailing list
> vnfpool@ietf.org
> https://www.ietf.org/mailman/listinfo/vnfpool


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    Hi Ning,<br>
    1) Is it exact that scaling out/in, one main characteristic of VNFs
    (compared to PNFs), is not included ?<br>
    2) Some comments/suggestions are enclosed.<br>
    Best,<br>
    Chidung<br>
    <br>
    <div class="moz-cite-prefix">Le 12/06/2014 05:38, Zongning a écrit :<br>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="line-height:150%;color:#1F497D" lang="EN-US">Dear
            all,<br>
            Please review the charter text included in the last email.
            We are hoping that a general consensus on the charter could
            be achieved on the list, then a stable charter is ready for
            the VNFPool session in Toronto.<br>
            Thanks.<br>
            -Ning<o:p></o:p></span></p>
        <div>
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style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
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              <b><span style="font-size:10.0pt;font-family:SimSun">发件人<span
                    lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:SimSun" lang="EN-US">
                vnfpool [<a class="moz-txt-link-freetext" href="mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a>]
              </span><b><span
                  style="font-size:10.0pt;font-family:SimSun">代表 </span></b><span
                style="font-size:10.0pt;font-family:SimSun" lang="EN-US">Zongning<br>
              </span><b><span
                  style="font-size:10.0pt;font-family:SimSun">发送时间<span
                    lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:SimSun" lang="EN-US">
                2014</span><span
                style="font-size:10.0pt;font-family:SimSun">年<span
                  lang="EN-US">6</span>月<span lang="EN-US">12</span>日<span
                  lang="EN-US"> 11:20<br>
                </span><b>收件人<span lang="EN-US">:</span></b><span
                  lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
                </span><b>主题<span lang="EN-US">:</span></b><span
                  lang="EN-US"> [vnfpool] Updated VNFPool Charter<o:p></o:p></span></span></p>
          </div>
        </div>
        <p class="MsoNormal" style="text-align:left" align="left"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Dear all,<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Based on the list discussion since we posted
            the last version, I have made some (minor) revision of the
            charter. The main changes are:<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
          level1 lfo2">
          <!--[if !supportLists]--><span lang="EN-US"><span
              style="mso-list:Ignore">1)<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span></span><!--[endif]--><span lang="EN-US">State
            that service state synchronization is out of scope “in this
            phase”;<b><o:p></o:p></b></span></p>
        <p class="MsoListParagraph"
          style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
          level1 lfo2">
          <!--[if !supportLists]--><span lang="EN-US"><span
              style="mso-list:Ignore">2)<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span></span><!--[endif]--><span lang="EN-US">Include
            VNF Pool with both virtualized and non-virtualized network
            function for further study;<b><o:p></o:p></b></span></p>
        <p class="MsoListParagraph"
          style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
          level1 lfo2">
          <!--[if !supportLists]--><span lang="EN-US"><span
              style="mso-list:Ignore">3)<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span></span><!--[endif]--><span lang="EN-US">Explicitly
            state that the reference solution &amp; gap analysis is not
            limited to RSerPool, but open to any other solutions,
            although no decision on protocols will be made in this
            phase;<b><o:p></o:p></b></span></p>
        <p class="MsoListParagraph"
          style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
          level1 lfo2">
          <!--[if !supportLists]--><span lang="EN-US"><span
              style="mso-list:Ignore">4)<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span></span><!--[endif]--><span lang="EN-US">State
            that the linkage between SFC and VNF Pool is just like a
            pool user and a pool – nothing specified (yet);<b><o:p></o:p></b></span></p>
        <p class="MsoListParagraph"
          style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
          level1 lfo2">
          <!--[if !supportLists]--><span lang="EN-US"><span
              style="mso-list:Ignore">5)<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span></span><!--[endif]--><span lang="EN-US">Update
            bullet #4 under “Questions that are raised…”, to keep it
            consistent with the idea that pooling is not visible to the
            service control entity.<b><o:p></o:p></b></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">==========================================================================<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Network functions such as firewalls, load
            balancers, and WAN optimizers are conventionally deployed as
            specialized hardware servers in both network operators'
            networks and data center networks as the building blocks of
            the network services. There is a trend to implement such
            network functions as software instances running on general
            purpose servers, via a virtualization layer (i.e.,
            hypervisors). These virtualized functions are called
            Virtualized Network Functions (VNFs), which can be used to
            build network services.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">The use of VNFs introduces additional
            challenges to the reliability of the provided network
            services. A single VNF instance would typically not have
            built-in reliability mechanisms on its host (i.e., a general
            purpose server). Instead, there are more factors of risk
            such as software failure at various levels including
            hypervisors and virtual machines, hardware failure, and
            instance migration that can make a VNF instance unreliable.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">In order to achieve higher reliability, a VNF
            may adopt a pooling mechanism, where a number of VNF
            instances with the same function can be grouped as a pool to
            provide the function. We call such a pool a VNF Pool.</span><span
            lang="DE">Conceptually, a </span><span lang="EN-US">Pool
            Manager is used to manage a VNF Pool, e.g., selects
            active/standby VNF instances, and potentially interacts with
            a service control entity.
          </span><span lang="DE">Such a </span><span lang="EN-US">service
            control entity is an entity that orchestrates a set of
            network functions to build network services. The major
            benefit of using VNF Pool is that reliability mechanisms
            such as redundancy model are achieved by the VNF Pool inside
            the VNF and thus not visible to the service control entity.
            A VNF Pool-enabled VNF still appears as a normal VNF when
            orchestrated by
          </span><span lang="DE">a </span><span lang="EN-US">service
            control entity.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Questions that are raised by the addition of a
            pooling mechanism to VNF include:<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
          level1 lfo4">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">How
            to manage the redundancy model, e.g., select active/standby
            VNF instances in a VNF Pool?<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
          level1 lfo4">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">What
            pool states need to be maintained to support the pooling
            mechanism itself, and how are such states maintained?<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
          level1 lfo4">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">What
            information is exchanged between a VNF and a service control
            entity? For example, how can a VNF Pool be addressed by the
            service control entity?<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
          level1 lfo4">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-CA">After
            a VNF instance failover, how does the Pool Manager notify
            the service control entity some characteristic changes of
            the VNF, e.g., capacity change, but without disclosure of
            the pooling procedure?</span><span lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">The WG initially focuses on several reliability
            mechanisms that are mainly associated with a redundancy
            model based on a VNF Pool. Additional mechanisms may include
            pool state maintenance
          </span><span lang="DE">only for pooling purpose. Service state
            synchronization is out of scope for this phase. The WG</span><span
            lang="EN-US"> assume</span><span lang="DE">s</span><span
            lang="EN-US"> that a VNF Pool contains redundant VNF
            instances of same functional type. </span><span lang="DE">Different
            types of VNFs are envisioned to be held in separate VNF
            Pools. VNF Pool composed by both virtualized and
            non-virtualized functional instances may be included after
            further use case and requirements study. The WG will address
            the reliability of an individual VNF, but not the
            reliability related
          </span><span lang="EN-US">to the control or the routing
            between adjacent VNFs </span>
          <span lang="DE">that can form a network service</span><span
            lang="EN-US">.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Specifically, the WG will work on the following
            technical aspects:<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
          level1 lfo6">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">Redundancy
            management within a VNF Pool, such as the signaling between
            the Pool Manager and the instances in the pool for instance
            registration, backup instances selection, and switching
            between active and standby instances.<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
          level1 lfo6">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">The
            protocol between the Pool Manager and the underlying network
            to collect the network information required for appropriate
            placement/selection of backup instances.<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
          level1 lfo6">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">The
            protocol between a VNF and the service control entity to
            exchange operational information between a VNF Pool</span><span
            lang="DE"> and the service control entity.</span><span
            lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
          level1 lfo6">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">Identify
            and analyze reliable interfaces, such as transport protocol
            like MPTCP and SCTP for reliable delivery of the messages
            associated with the redundancy management within a VNF Pool.<o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
          level1 lfo6">
          <!--[if !supportLists]--><span style="font-family:Symbol"
            lang="EN-US"><span style="mso-list:Ignore">·<span
                style="font:7.0pt &quot;Times New Roman&quot;">          
              </span></span></span><!--[endif]--><span lang="EN-US">Analysis
            of pooling security characteristics and requirements to
            identify and mitigate threats against the pooling mechanism.
            Identification of an appropriate trust model between pool
            members, and between pool members and the Pool Manager.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">The WG plans to deliver a problem statement, a
            set of use cases, requirements and an architecture covering
            the aforementioned technical aspects, and applicability and
            gap analysis of existing technologies including but not
            limited to RSerPool. We will rely heavily on existing IETF
            technologies, but that gaps will be found around problems
            like redundancy mechanisms, state maintenance</span><span
            lang="DE"> solely for pooling purposes</span><span
            lang="EN-US">, reliable transport, and trust/security, all
            of which will need to be considered and addressed. Although
            no decision on protocols will be made in this phase, we will
            keep open for candidate protocols for VNF Pool. The WG will
            seek re-chartering before adopting any work to develop new,
            or extend existing, protocols.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">In particular, we will work closely with the
            SFC WG, as we believe that SFC and VNF Pool are independent
            but complementary.
            <span style="color:black">SFC would essentially see a VNF
              Pool-enabled VNF as a normal service function and
              therefore be able to merge it into an SFC just like any
              other service functions. Just like the communication
              between any pool users and VNF Pool, the information
              exchanged between the VNF Pool and the SFC may include
              some operational information of the VNF Pool.</span><o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Goals and Milestones:<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">December 2014 - Submit VNFPool Problem
            Statement to IESG for publication as an Informational
            document.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">April 2015 - Submit VNFPool Use Cases to IESG
            for publication as an Informational document.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">August 2015 - Submit VNFPool Requirements,
            including the manageability of VNF Pool to IESG for
            publication as an Informational document.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">August 2015 - Submit VNFPool Architecture to
            IESG for publication as an Informational document.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">December 2015 - Submit one or more
            Applicability and Gap Analysis of existing protocols to
            VNFPool to IESG for publication as Informational
            document(s).<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">==========================================================================<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Your comments and suggestions to the charter
            are ALWAYS highly appreciated!<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">Thanks.<o:p></o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            lang="EN-US">-Ning<o:p></o:p></span></p>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
vnfpool mailing list
<a class="moz-txt-link-abbreviated" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/vnfpool">https://www.ietf.org/mailman/listinfo/vnfpool</a>
</pre>
    </blockquote>
    <br>
  </body>
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Date: Thu, 19 Jun 2014 00:56:49 +0000
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From nobody Thu Jun 19 12:03:43 2014
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From: "King, Daniel" <d.king@lancaster.ac.uk>
To: Zongning <zongning@huawei.com>
Thread-Topic: New Version Notification for draft-king-vnfpool-mobile-use-case (Now Version 01)
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Subject: Re: [vnfpool] New Version Notification for draft-king-vnfpool-mobile-use-case (Now Version 01)
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From nobody Thu Jun 19 22:17:22 2014
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From: "Sood, Kapil" <kapil.sood@intel.com>
To: Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: comments on VNF Pool Charter
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Date: Fri, 20 Jun 2014 05:17:14 +0000
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Subject: Re: [vnfpool] comments on VNF Pool Charter
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--_000_7B96B1DAA4CC63459FB0B17038C6A4744F968F00ORSMSX102amrcor_--


From nobody Fri Jun 20 00:00:53 2014
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Date: Thu, 19 Jun 2014 23:00:44 -0800
From: Melinda Shore <melinda.shore@gmail.com>
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Subject: Re: [vnfpool] comments on VNF Pool Charter
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On 6/19/14 9:17 PM, Sood, Kapil wrote:
> [Kapil] Well, I believe there will be many cases where the VIM/VNFM will
> need to determine the infrastructure conditions, even for SBY/ACT
> placements,  so I agree your suggestion to add appropriate text to the
> charter questions.

Hi, Kapil: at this point in the process we're trying to identify
the questions that a working group, should it be chartered, will
address, and it seems to me that at this time we're probably more
concerned with how to define the question so that it's something
we can answer - that is to say, we need to identify which pieces
of information will need to be used as the basis for a failover,
as well as which pieces of information will need to be transferred
or replicated.  (As a side note it's pretty clear that we'll need
to identify what's coupled with and dependent on ETSI NFV vs.
what's coupled with and dependent on IETF sfc).

> I do have a follow-up question on the contents of the specific images,
> more specifically live state including any secrets or sensitive
> information protection.  Is the charter dealing with the security
> aspects, too?

Yes, any work undertaken in the IETF needs to address security issues
(including privacy), and that's one of our higher-priority concerns
given the sensitivity of network state and potentially very serious
problems around service state.  We've got people with security
expertise involved right now, and may choose to exercise the option
of early security review as the documents progress.

Melinda



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From: "Sood, Kapil" <kapil.sood@intel.com>
To: Melinda Shore <melinda.shore@gmail.com>, Zongning <zongning@huawei.com>, "vnfpool@ietf.org" <vnfpool@ietf.org>
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Thank you, Melinda.  This helps.  I am just joining the discussion, so just=
 understanding context.=20

Best Regards,

Kapil.

-----Original Message-----
From: Melinda Shore [mailto:melinda.shore@gmail.com]=20
Sent: Friday, June 20, 2014 12:01 AM
To: Sood, Kapil; Zongning; vnfpool@ietf.org
Subject: Re: [vnfpool] comments on VNF Pool Charter

On 6/19/14 9:17 PM, Sood, Kapil wrote:
> [Kapil] Well, I believe there will be many cases where the VIM/VNFM=20
> will need to determine the infrastructure conditions, even for SBY/ACT=20
> placements,  so I agree your suggestion to add appropriate text to the=20
> charter questions.

Hi, Kapil: at this point in the process we're trying to identify the questi=
ons that a working group, should it be chartered, will address, and it seem=
s to me that at this time we're probably more concerned with how to define =
the question so that it's something we can answer - that is to say, we need=
 to identify which pieces of information will need to be used as the basis =
for a failover, as well as which pieces of information will need to be tran=
sferred or replicated.  (As a side note it's pretty clear that we'll need t=
o identify what's coupled with and dependent on ETSI NFV vs.
what's coupled with and dependent on IETF sfc).

> I do have a follow-up question on the contents of the specific images,=20
> more specifically live state including any secrets or sensitive=20
> information protection.  Is the charter dealing with the security=20
> aspects, too?

Yes, any work undertaken in the IETF needs to address security issues (incl=
uding privacy), and that's one of our higher-priority concerns given the se=
nsitivity of network state and potentially very serious problems around ser=
vice state.  We've got people with security expertise involved right now, a=
nd may choose to exercise the option of early security review as the docume=
nts progress.

Melinda



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On 6/20/14 9:52 AM, Sood, Kapil wrote:
> Thank you, Melinda.  This helps.  I am just joining the discussion, so just understanding context. 

Great!  I hope you'll continue to add comments or questions, and I hope
we'll see you in Toronto.

Melinda



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<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <font face="Helvetica, Arial, sans-serif">Hi Ning,<br>
      <br>
      Thanks for your answer and clarification and sorry for my late response.<br>
      <br>
      Please see inline:<br>
      <br>
    </font>
    <div class="moz-cite-prefix">(2014/06/17 10:36), Zongning wrote:<br>
    </div>
    <blockquote
cite="mid:B0D29E0424F2DE47A0B36779EC66677966145BDD@nkgeml501-mbs.china.huawei.com"
      type="cite">
      <pre wrap="">Hi, Hidetoshi,

Thanks for reviewing the new charter. Please see inline.

-----邮件原件-----
发件人: vnfpool [<a class="moz-txt-link-freetext" href="mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a>] 代表 Hidetoshi Yokota
发送时间: 2014年6月16日 22:58
收件人: <a class="moz-txt-link-abbreviated" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a>
主题: Re: [vnfpool] Updated VNFPool Charter

Dear Ning,

Thanks a lot for updating the charter and congratulations on BoF approval! Allow me to ask a couple of clarification questions.

o Could you clarify what "service state synchronization" is and why it is out of scope in this phase?

[Ning] Service state related to a specific function, e.g., NAT translation table, is usually synchronized between a live and backup VNF instance for stateful failover. However, this seemed to be a controversial item during the last BoF in London IETF, where we could not find multi-vendor support to standardize the state synchronization interface among their VNFs. We certainly understand that this is still a very important item for VNF failover, and will keep looking for the multi-vendor support. As mentioned in the charter, we leave it out of scope in this phase, which means we don't exclude it but will treat it as a future work.
</pre>
    </blockquote>
    <font face="Helvetica, Arial, sans-serif"><br>
      HY&gt; State synchronization is already identified by the PS
      document, so it is not appropriate just to say "out of scope in
      this phase". It may be possible to provide some assisting
      functions to the VNF even if service state synchronization is done
      within VNFs. </font><font face="Helvetica, Arial, sans-serif"><font
        face="Helvetica, Arial, sans-serif">At least, it should be
        discussed what level of synchronization can be supported and
        when. My proposal is: "<b>T</b><b>he support of service state
          synchronization (e.g., its level and timing) will be
          determined during the course of this work</b>"<br>
          </font><br>
    </font>
    <blockquote
cite="mid:B0D29E0424F2DE47A0B36779EC66677966145BDD@nkgeml501-mbs.china.huawei.com"
      type="cite">
      <pre wrap="">
- Does this service state include "networking service"? If so, active/active redundancy cannot maintain the state information in, for example, virtual routers any more, which would be a significant degrade from the current physical networks.

[Ning] See above. We agree it is important to maintain service state, but leave it out of scope until we find enough multi-vendor support.
</pre>
    </blockquote>
    <font face="Helvetica, Arial, sans-serif">HY&gt; The same discussion
      as the above. We should at least discuss it and potential
      requirement may be identified apart from when to fulfill it.<br>
      <br>
    </font>
    <blockquote
cite="mid:B0D29E0424F2DE47A0B36779EC66677966145BDD@nkgeml501-mbs.china.huawei.com"
      type="cite">
      <pre wrap="">
- What is the relationship between service state synchronization and pool state maintenance?

[Ning] Pool states could be operational information of VNF pool itself, e.g. redundancy settings (n+k, 1:n, etc.), backup location/status, etc. They are not related to service state.
</pre>
    </blockquote>
    <font face="Helvetica, Arial, sans-serif">HY&gt; Ok. Thanks.</font><br>
    <blockquote
cite="mid:B0D29E0424F2DE47A0B36779EC66677966145BDD@nkgeml501-mbs.china.huawei.com"
      type="cite">
      <pre wrap="">
2) Is the service control entity the NFV Orchestrator or VNF Manager or none of them in NFV terminolgy?

[Ning] I would guess it is more like the NFV Orchestrator to orchestrate the whole service, although we don’t map the VNFPool terminology to NFV terminology by purpose. :-)

3) In the last paragraph just before Goals and Milestones, it says, "the information exchanged between the VNF Pool and the SFC may..." If some information is exchanged between them, they are not independent any more, which would contradict the first sentence of this paragraph.

[Ning] Well, "independent" means that the pooling mechanisms defined in VNFPool are not coupled/dependent to SFC. But "independent" doesn't mean that they are not communicating at all. :-) So we have "information exchanged ...".
</pre>
    </blockquote>
    <br>
    <font face="Helvetica, Arial, sans-serif">HY&gt; Ok, I think what is
      important is "complementary" and "independent" could be
      misleading. My proposal is: <b>In particular, the WG will work
        closely with the SFC WG, which is expected to provide
        complementary functionality to VNF Pool</b>.</font><br>
    <br>
    <font face="Helvetica, Arial, sans-serif">Regards,</font><font
      face="Helvetica, Arial, sans-serif"><br>
    </font>
    <pre class="moz-signature" cols="72">-- 
Hidetoshi Yokota

KDDI R&amp;D Laboratories, Inc.
<a class="moz-txt-link-abbreviated" href="mailto:e-mail:yokota@kddilabs.jp">e-mail:yokota@kddilabs.jp</a></pre>
    <font face="Helvetica, Arial, sans-serif"><br>
    </font>
    <blockquote
cite="mid:B0D29E0424F2DE47A0B36779EC66677966145BDD@nkgeml501-mbs.china.huawei.com"
      type="cite">
      <pre wrap="">
Could you clarify a bit more on them please?

Regards,

--
Hidetoshi Yokota

KDDI R&amp;D Laboratories, Inc.
<a class="moz-txt-link-abbreviated" href="mailto:e-mail:yokota@kddilabs.jp">e-mail:yokota@kddilabs.jp</a>

(2014/06/12 12:19), Zongning wrote:
</pre>
      <blockquote type="cite">
        <pre wrap="">
Dear all,

Based on the list discussion since we posted the last version, I have 
made some (minor) revision of the charter. The main changes are:

1)State that service state synchronization is out of scope “in this
phase”;**

2)Include VNF Pool with both virtualized and non-virtualized network 
function for further study;**

3)Explicitly state that the reference solution &amp; gap analysis is not 
limited to RSerPool, but open to any other solutions, although no 
decision on protocols will be made in this phase;**

4)State that the linkage between SFC and VNF Pool is just like a pool 
user and a pool – nothing specified (yet);**

5)Update bullet #4 under “Questions that are raised…”, to keep it 
consistent with the idea that pooling is not visible to the service 
control entity.**

======================================================================
====

Network functions such as firewalls, load balancers, and WAN 
optimizers are conventionally deployed as specialized hardware servers 
in both network operators' networks and data center networks as the 
building blocks of the network services. There is a trend to implement 
such network functions as software instances running on general 
purpose servers, via a virtualization layer (i.e., hypervisors). These 
virtualized functions are called Virtualized Network Functions (VNFs), 
which can be used to build network services.

The use of VNFs introduces additional challenges to the reliability of 
the provided network services. A single VNF instance would typically 
not have built-in reliability mechanisms on its host (i.e., a general 
purpose server). Instead, there are more factors of risk such as 
software failure at various levels including hypervisors and virtual 
machines, hardware failure, and instance migration that can make a VNF 
instance unreliable.

In order to achieve higher reliability, a VNF may adopt a pooling 
mechanism, where a number of VNF instances with the same function can 
be grouped as a pool to provide the function. We call such a pool a 
VNF Pool.Conceptually, a Pool Manager is used to manage a VNF Pool, 
e.g., selects active/standby VNF instances, and potentially interacts 
with a service control entity. Such a service control entity is an 
entity that orchestrates a set of network functions to build network 
services. The major benefit of using VNF Pool is that reliability 
mechanisms such as redundancy model are achieved by the VNF Pool 
inside the VNF and thus not visible to the service control entity. A 
VNF Pool-enabled VNF still appears as a normal VNF when orchestrated 
by a service control entity.

Questions that are raised by the addition of a pooling mechanism to 
VNF include:

·How to manage the redundancy model, e.g., select active/standby VNF 
instances in a VNF Pool?

·What pool states need to be maintained to support the pooling 
mechanism itself, and how are such states maintained?

·What information is exchanged between a VNF and a service control 
entity? For example, how can a VNF Pool be addressed by the service 
control entity?

·After a VNF instance failover, how does the Pool Manager notify the 
service control entity some characteristic changes of the VNF, e.g., 
capacity change, but without disclosure of the pooling procedure?

The WG initially focuses on several reliability mechanisms that are 
mainly associated with a redundancy model based on a VNF Pool.
Additional mechanisms may include pool state maintenance only for 
pooling purpose. Service state synchronization is out of scope for 
this phase. The WGassumesthat a VNF Pool contains redundant VNF 
instances of same functional type. Different types of VNFs are 
envisioned to be held in separate VNF Pools. VNF Pool composed by both 
virtualized and non-virtualized functional instances may be included 
after further use case and requirements study. The WG will address the 
reliability of an individual VNF, but not the reliability related to 
the control or the routing between adjacent VNFs that can form a 
network service.

Specifically, the WG will work on the following technical aspects:

·Redundancy management within a VNF Pool, such as the signaling 
between the Pool Manager and the instances in the pool for instance 
registration, backup instances selection, and switching between active 
and standby instances.

·The protocol between the Pool Manager and the underlying network to 
collect the network information required for appropriate 
placement/selection of backup instances.

·The protocol between a VNF and the service control entity to exchange 
operational information between a VNF Pooland the service control entity.

·Identify and analyze reliable interfaces, such as transport protocol 
like MPTCP and SCTP for reliable delivery of the messages associated 
with the redundancy management within a VNF Pool.

·Analysis of pooling security characteristics and requirements to 
identify and mitigate threats against the pooling mechanism.
Identification of an appropriate trust model between pool members, and 
between pool members and the Pool Manager.

The WG plans to deliver a problem statement, a set of use cases, 
requirements and an architecture covering the aforementioned technical 
aspects, and applicability and gap analysis of existing technologies 
including but not limited to RSerPool. We will rely heavily on 
existing IETF technologies, but that gaps will be found around 
problems like redundancy mechanisms, state maintenancesolely for 
pooling purposes, reliable transport, and trust/security, all of which 
will need to be considered and addressed. Although no decision on 
protocols will be made in this phase, we will keep open for candidate 
protocols for VNF Pool. The WG will seek re-chartering before adopting 
any work to develop new, or extend existing, protocols.

In particular, we will work closely with the SFC WG, as we believe 
that SFC and VNF Pool are independent but complementary. SFC would 
essentially see aVNFPool-enabled VNFas a normal service function and 
therefore be able to merge it into an SFC just like any other service 
functions. Just like the communication between any pool users and VNF 
Pool, the information exchanged between the VNF Pool and the SFC may 
include some operational information of the VNF Pool.

Goals and Milestones:

December 2014 - Submit VNFPool Problem Statement to IESG for 
publication as an Informational document.

April 2015 - Submit VNFPool Use Cases to IESG for publication as an 
Informational document.

August 2015 - Submit VNFPool Requirements, including the manageability 
of VNF Pool to IESG for publication as an Informational document.

August 2015 - Submit VNFPool Architecture to IESG for publication as 
an Informational document.

December 2015 - Submit one or more Applicability and Gap Analysis of 
existing protocols to VNFPool to IESG for publication as Informational 
document(s).

======================================================================
====

Your comments and suggestions to the charter are ALWAYS highly 
appreciated!

Thanks.

-Ning



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</pre>
      </blockquote>
      <pre wrap="">

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</pre>
    </blockquote>
    <br>
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From: Zongning <zongning@huawei.com>
To: "vnfpool@ietf.org" <vnfpool@ietf.org>
Thread-Topic: Preliminary BoF Agend Posted
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Hi,

Please see below IETF 90th Preliminary Agenda. VNFPool BoF has been schedul=
ed on Tuesday afternoon 14:20-16:20.
https://datatracker.ietf.org/meeting/90/agenda.html

Please let me know if you have any conflict or concern on this agenda. At l=
east, I have noted that there will be I2RS and IRTF Open Meeting at that ti=
me slot.

Thanks.

-Ning

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please see below IETF 90<sup>th=
</sup> Preliminary Agenda. VNFPool BoF has been scheduled on Tuesday aftern=
oon 14:20-16:20.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/meeting/90/agenda.html">https://datatracker.ietf.org/meeting/90/ag=
enda.html</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please let me know if you have =
any conflict or concern on this agenda. At least, I have noted that there w=
ill be I2RS and IRTF Open Meeting at that time slot.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Ning<o:p></o:p></span></p>
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From nobody Tue Jun 24 08:31:00 2014
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Zongning'" <zongning@huawei.com>, <vnfpool@ietf.org>
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Subject: Re: [vnfpool] Updated VNFPool Charter
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Hi Ning,

I know that there have been some discussions on the list about the draft
charter, but I am returning to your clean copy from 12th June.

The charter looks good to me (at least from an RTG perspective). I have some
nits and a minor comment below.

Thanks,
Adrian

> Network functions such as firewalls, load balancers, and WAN optimizers are
> conventionally deployed as specialized hardware servers in both network 
> operators' networks and data center networks as the building blocks of the

s/of the/of/

> network services. There is a trend to implement such network functions as
> software instances running on general purpose servers, via a virtualization
> layer (i.e., hypervisors).

I think that should read...
(i.e., under the control of a hypervisor)

> These virtualized functions are called Virtualized Network Functions (VNFs),
> which can be used to build network services.
>
>The use of VNFs introduces additional challenges to the reliability of the
> provided network services. A single VNF instance would typically not have
> built-in reliability mechanisms on its host (i.e., a general purpose server). 
> Instead, there are more factors of risk such as software failure at various

s/factors of risk/risk factors/

> levels including hypervisors and virtual machines, hardware failure, and
> instance migration that can make a VNF instance unreliable.
>
> In order to achieve higher reliability, a VNF may adopt a pooling
> mechanism, where a number of VNF instances with the same function
> can be grouped as a pool to provide the function. We call such a pool a
> VNF Pool.Conceptually, a Pool Manager is used to manage a VNF Pool,

s/Pool.Conceptually/Pool. Conceptually/

> e.g., selects active/standby VNF instances, and potentially interacts

s/selects/to select/
s/interacts/to interact/

> with a service control entity. Such a service control entity is an entity
> that orchestrates a set of network functions to build network services.
> The major benefit of using VNF Pool is that reliability mechanisms such
> as redundancy model are achieved by the VNF Pool inside the VNF and
> thus not visible to the service control entity. A VNF Pool-enabled VNF
> still appears as a normal VNF when orchestrated by a service control
> entity.

Is this completely how you want it? Isn't there some benefit to a service
control entity in knowing that a VNF is protected through a pool compared to
unprotected? That is, when a service control entity is selecting between NFV
instances it may select according to various factors (such as path length
between functions in a chain, and loading of VNF instances) and the knowledge
that one VNF instance is protected through an VNV pool may be significant.

So, I think that it is the operation of the VNF pool reliability mechanism that
is unknown to the service control entity, but not the fact of reliability.


> Questions that are raised by the addition of a pooling mechanism to 
> VNF include:
> . How to manage the redundancy model, e.g., select active/standby
>   VNF instances in a VNF Pool?
> . What pool states need to be maintained to support the pooling
>   mechanism itself, and how are such states maintained?
> . What information is exchanged between a VNF and a service
>   control entity? For example, how can a VNF Pool be addressed by
>   the service control entity?

Here we include the fact of reliability.

> . After a VNF instance failover, how does the Pool Manager notify
>    the service control entity some characteristic changes of the VNF,
>    e.g., capacity change, but without disclosure of the pooling
>   procedure?
>
> The WG initially focuses on several reliability mechanisms that are
> mainly associated with a redundancy model based on a VNF Pool.
> Additional mechanisms may include pool state maintenance only 
> for pooling purpose. Service state synchronization is out of scope
> for this phase. The WG assumes that a VNF Pool contains redundant
> VNF instances of same functional type. Different types of VNFs are
> envisioned to be held in separate VNF Pools. VNF Pool composed
> by both virtualized and non-virtualized functional instances may be 
> included after further use case and requirements study. The WG
> will address the reliability of an individual VNF, but not the reliability
> related to the control or the routing between adjacent VNFs that
> can form a network service.

I wonder whether the charter should be clearer that the VNF pool appears as an
instance and that only one instance in a pool is really active. The point here
is that the pool is not a set for load balancing across and does not increase
the load capacity of the VNF that the service control function can see.

> Specifically, the WG will work on the following technical aspects:
> . Redundancy management within a VNF Pool, such as the signaling
>   between the Pool Manager and the instances in the pool for instance
>   registration, backup instances selection, and switching between
>   active and standby instances.
> . The protocol between the Pool Manager and the underlying network
>    to collect the network information required for appropriate placement/
>    selection of backup instances.
> . The protocol between a VNF and the service control entity to exchange
>    operational information between a VNF Pool and the service control
>    entity.
> . Identify and analyze reliable interfaces, such as transport protocol like
>    MPTCP and SCTP for reliable delivery of the messages associated with
>    the redundancy management within a VNF Pool.
> . Analysis of pooling security characteristics and requirements to identify
>    and mitigate threats against the pooling mechanism. Identification of an
>    appropriate trust model between pool members, and between pool
>    members and the Pool Manager.
>
> The WG plans to deliver a problem statement, a set of use cases, 
> requirements and an architecture covering the aforementioned technical
> aspects, and applicability and gap analysis of existing technologies including
> but not limited to RSerPool. We will rely heavily on existing IETF
technologies,
> but that gaps will be found around problems like redundancy mechanisms, 
> state maintenance solely for pooling purposes, reliable transport, and trust/
> security, all of which will need to be considered and addressed. Although no
> decision on protocols will be made in this phase, we will keep open for 
> candidate protocols for VNF Pool. The WG will seek re-chartering before
> adopting any work to develop new, or extend existing, protocols.
>
> In particular, we will work closely with the SFC WG, as we believe that SFC
> and VNF Pool are independent but complementary. SFC would essentially
> see a VNF Pool-enabled VNF as a normal service function and therefore be
> able to merge it into an SFC just like any other service functions. Just like
> the communication between any pool users and VNF Pool, the information
> exchanged between the VNF Pool and the SFC may include some operational
> information of the VNF Pool.
>
> Goals and Milestones:
> December 2014 - Submit VNFPool Problem Statement to IESG for publication
> as an Informational document.
> April 2015 - Submit VNFPool Use Cases to IESG for publication as an
Informational
> document.
> August 2015 - Submit VNFPool Requirements, including the manageability of VNF
> Pool to IESG for publication as an Informational document.
> August 2015 - Submit VNFPool Architecture to IESG for publication as an
> Informational document.
> December 2015 - Submit one or more Applicability and Gap Analysis of existing
> protocols to VNFPool to IESG for publication as Informational document(s).



From nobody Thu Jun 26 08:47:06 2014
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From: Thomas Dreibholz <dreibh@iem.uni-due.de>
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Subject: [vnfpool] Call for Papers of the PAMS 2015
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We apologize if you receive multiple copies of this CFP.


CALL FOR PAPERS

The 5th International Workshop on Protocols and Applications with Multi=
-Homing=20
Support (PAMS 2015)
In conjunction with the 29th IEEE International Conference on Advanced=20=

Information Networking and Applications (AINA 2015)
March 24-27, 2015 in Gwangju/South Korea
https://simula.no/pams-2015

The intent of our workshop is to bring together people from research an=
d
industry, in order to provide a discussion forum for state-of-the-art t=
opics
related to multi-homing on Network, Transport, Session and Application =
Layers.
The PAMS workshop will include full-paper sessions as well as a poster =
session
(with short presentations) to introduce preliminary ideas as well as wo=
rk in
progress.

Workshops proceedings will be published by the IEEE CS Conference Publi=
shing
Service and will be included in the Digital Library.

The main topics to be addressed include (but are not limited to):

    * Network Resilience by Multi-Homing
    * Network Architectures for Multi-Homed Systems
    * Performance Evaluation of Multi-Homed Systems
    * Deployment of Multi-Homed Protocols in Existing Networks
      with Middleboxes
    * Design and Implementation of Multi-Homed Systems
    * Testbeds for Multi-Homed Systems
    * Load Sharing and Load Balancing for Multi-Homed Systems
    * Mobility for Multi-Homed Systems
    * Protocols with Multi-Homing Support
    * Congestion and Flow Control of Multi-Homed Systems
    * Quality of Service for Multi-Homed Systems
    * Multi-Homing for Interconnection Networks
    * Security of Multi-Homed Systems
    * Application Deployment and Support for Legacy Applications
    * Cross-Layer Optimisation for Multi-Homed Systems
    * Multi-Homing in the Context of the Future Internet

GENERAL CHAIRS:

    * Thomas Dreibholz, Simula Research Laboratory, Norway
    * Hakim Adhari, University of Duisburg-Essen, Germany

PUBLICITY CHAIRS:

    * Glenford Mapp, Middlesex University, United Kingdom
    * Xing Zhou, Hainan University, China

PROGRAM COMMITTEE

    * Hakim Adhari, University of Duisburg-Essen, Germany
    * Nicola Altan, ista International, Germany
    * =C4=B0lknur Ayd=C4=B1n, Farmingdale State College, U.S.A.
    * =C5=81ukasz Budzisz, Technische Universit=C3=A4t Berlin, Germany
    * Martin Becke, University of Duisburg-Essen, Germany
    * Anna Brunstr=C3=B6m, Karlstad University, Sweden
    * Ahmed Elmokashfi, Simula Research Laboratory, Norway
    * Kristian Evensen, Simula Research Laboratory, Norway
    * Simone Ferlin, Simula Research Laboratory, Norway
    * Ernst Gunnar Gran, Simula Research Laboratory, Norway
    * Michio Honda, Keio University, Japan
    * Seok Joo Koh, Kyungpook National University, South Korea
    * Amund Kvalbein, Simula Research Laboratory, Norway
    * Glenford Mapp, Middlesex University, United Kingdom
    * Michael Menth, University of T=C3=BCbingen, Germany
    * Samuel Rodrigo Mocholi, Oracle, Norway
    * Preethi Natarajan, Cisco, U.S.A.
    * Jes=C3=BAs Escudero Sahuquillo, Oracle, Norway
    * Francisco Trivi=C3=B1o-Garc=C3=ADa, Oracle, Norway
    * Esbold Unurkhaan, Mongolian University of Science and Technology,=
=20
Mongolia
    * Alan Wagner, University of British Columbia, Canada
    * Thomas Volkert, Ilmenau University of Technology, Germany
    * Michael Welzl, University of Oslo, Norway
    * Xing Zhou, Hainan University, China


IMPORTANT DATES

    * Paper Submission Deadline:      October 1, 2014
    * Author Notification:            December 15, 2014
    * Author Registration:            January 15, 2015
    * Camera-Ready Paper Submission:  January 15, 2015


CONTACT

For further information, please contact:

    * Thomas Dreibholz (dreibh@simula.no)
    * Hakim Adhari (hakim.adhari@uni-due.de)


WEBSITE

https://simula.no/pams-2015


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Hi Ning,
Thank you for the reply. Some comments/suggestions to your:
* comment Z2:I knew that the « elementary » NFs are part of the job, but 
wanted to suggest to add something in this section to avoid readers to 
perceivethe wrong feeling mentioned in my comment #1
* comment Z7:Thank you for this clarification. I thus understand that 
three types of pools (and not more than three) may exist:
      - (i) no redundancy at all, i.e., all instances of the pool 
participate actively - an upstream load balancing mechanism shares the 
incoming load among these instances;
      - (ii) 1:1 (active-active) redundancy - for example, 5 "images" 
(to avoid the word 'instance') of the VNF, and each of them is redundant 
-> in this case, there are 10 instances running in parallel in the pool;
      - (iii) N+K (active-standby) redundancy where some instances run 
actively, while others are in a dormant state.
* comment Z9:How about this add-on then ? "... achieved by the VNF Pool 
*architecture* utilized/adopted by the VNF ..."
Best,
Chidung

Le 19/06/2014 05:14, Zongning a écrit :
>
> Hi, Chidung,
> Please see my reply enclosed in the attachment. Regarding comment#6, 
> I’d like to explain that we don’t restrict to the case that in a pool, 
> at a given time, there is only one running instance and all others are 
> sleeping. A pool should be flexible to handle more cases, including 
> multiple running instances and multiple standby instances.
> Look forward to your further comments & suggestions.
> -Ning
>
> *发 件人:*LAC Chidung [mailto:chidung.lac@orange.com]
> *发 送时间:*2014年6月19日0:40
> *收件人:*Zongning
> *抄送:*vnfpool@ietf.org
> *主题:*Re: [vnfpool] 答复: Updated VNFPool Charter
>
> Hi Ning,
> 1) Is it exact that scaling out/in, one main characteristic of VNFs 
> (compared to PNFs), is not included ?
> 2) Some comments/suggestions are enclosed.
> Best,
> Chidung
>
> Le 12/06/2014 05:38, Zongning a écrit :
>
>     Dear all,
>     Please review the charter text included in the last email. We are
>     hoping that a general consensus on the charter could be achieved
>     on the list, then a stable charter is ready for the VNFPool
>     session in Toronto.
>     Thanks.
>     -Ning
>
>     *发件人:*vnfpool [mailto:vnfpool-bounces@ietf.org] *代 表 *Zongning
>     *发 送时间:*2014年6月12日11:20
>     *收件人:*vnfpool@ietf.org <mailto:vnfpool@ietf.org>
>     *主题:*[vnfpool] Updated VNFPool Charter
>
>     Dear all,
>
>     Based on the list discussion since we posted the last version, I
>     have made some (minor) revision of the charter. The main changes are:
>
>     1)State that service state synchronization is out of scope “in
>     this phase”;
>
>     2)Include VNF Pool with both virtualized and non-virtualized
>     network function for further study;
>
>     3)Explicitly state that the reference solution & gap analysis is
>     not limited to RSerPool, but open to any other solutions, although
>     no decision on protocols will be made in this phase;
>
>     4)State that the linkage between SFC and VNF Pool is just like a
>     pool user and a pool – nothing specified (yet);
>
>     5)Update bullet #4 under “Questions that are raised…”, to keep it
>     consistent with the idea that pooling is not visible to the
>     service control entity.
>
>     ==========================================================================
>
>     Network functions such as firewalls, load balancers, and WAN
>     optimizers are conventionally deployed as specialized hardware
>     servers in both network operators' networks and data center
>     networks as the building blocks of the network services. There is
>     a trend to implement such network functions as software instances
>     running on general purpose servers, via a virtualization layer
>     (i.e., hypervisors). These virtualized functions are called
>     Virtualized Network Functions (VNFs), which can be used to build
>     network services.
>
>     The use of VNFs introduces additional challenges to the
>     reliability of the provided network services. A single VNF
>     instance would typically not have built-in reliability mechanisms
>     on its host (i.e., a general purpose server). Instead, there are
>     more factors of risk such as software failure at various levels
>     including hypervisors and virtual machines, hardware failure, and
>     instance migration that can make a VNF instance unreliable.
>
>     In order to achieve higher reliability, a VNF may adopt a pooling
>     mechanism, where a number of VNF instances with the same function
>     can be grouped as a pool to provide the function. We call such a
>     pool a VNF Pool.Conceptually, a Pool Manager is used to manage a
>     VNF Pool, e.g., selects active/standby VNF instances, and
>     potentially interacts with a service control entity. Such a
>     service control entity is an entity that orchestrates a set of
>     network functions to build network services. The major benefit of
>     using VNF Pool is that reliability mechanisms such as redundancy
>     model are achieved by the VNF Pool inside the VNF and thus not
>     visible to the service control entity. A VNF Pool-enabled VNF
>     still appears as a normal VNF when orchestrated by a service
>     control entity.
>
>     Questions that are raised by the addition of a pooling mechanism
>     to VNF include:
>
>     ·How to manage the redundancy model, e.g., select active/standby
>     VNF instances in a VNF Pool?
>
>     ·What pool states need to be maintained to support the pooling
>     mechanism itself, and how are such states maintained?
>
>     ·What information is exchanged between a VNF and a service control
>     entity? For example, how can a VNF Pool be addressed by the
>     service control entity?
>
>     ·After a VNF instance failover, how does the Pool Manager notify
>     the service control entity some characteristic changes of the VNF,
>     e.g., capacity change, but without disclosure of the pooling
>     procedure?
>
>     The WG initially focuses on several reliability mechanisms that
>     are mainly associated with a redundancy model based on a VNF Pool.
>     Additional mechanisms may include pool state maintenance only for
>     pooling purpose. Service state synchronization is out of scope for
>     this phase. The WGassumesthat a VNF Pool contains redundant VNF
>     instances of same functional type. Different types of VNFs are
>     envisioned to be held in separate VNF Pools. VNF Pool composed by
>     both virtualized and non-virtualized functional instances may be
>     included after further use case and requirements study. The WG
>     will address the reliability of an individual VNF, but not the
>     reliability related to the control or the routing between adjacent
>     VNFs that can form a network service.
>
>     Specifically, the WG will work on the following technical aspects:
>
>     ·Redundancy management within a VNF Pool, such as the signaling
>     between the Pool Manager and the instances in the pool for
>     instance registration, backup instances selection, and switching
>     between active and standby instances.
>
>     ·The protocol between the Pool Manager and the underlying network
>     to collect the network information required for appropriate
>     placement/selection of backup instances.
>
>     ·The protocol between a VNF and the service control entity to
>     exchange operational information between a VNF Pooland the service
>     control entity.
>
>     ·Identify and analyze reliable interfaces, such as transport
>     protocol like MPTCP and SCTP for reliable delivery of the messages
>     associated with the redundancy management within a VNF Pool.
>
>     ·Analysis of pooling security characteristics and requirements to
>     identify and mitigate threats against the pooling mechanism.
>     Identification of an appropriate trust model between pool members,
>     and between pool members and the Pool Manager.
>
>     The WG plans to deliver a problem statement, a set of use cases,
>     requirements and an architecture covering the aforementioned
>     technical aspects, and applicability and gap analysis of existing
>     technologies including but not limited to RSerPool. We will rely
>     heavily on existing IETF technologies, but that gaps will be found
>     around problems like redundancy mechanisms, state
>     maintenancesolely for pooling purposes, reliable transport, and
>     trust/security, all of which will need to be considered and
>     addressed. Although no decision on protocols will be made in this
>     phase, we will keep open for candidate protocols for VNF Pool. The
>     WG will seek re-chartering before adopting any work to develop
>     new, or extend existing, protocols.
>
>     In particular, we will work closely with the SFC WG, as we believe
>     that SFC and VNF Pool are independent but complementary. SFC would
>     essentially see a VNF Pool-enabled VNF as a normal service
>     function and therefore be able to merge it into an SFC just like
>     any other service functions. Just like the communication between
>     any pool users and VNF Pool, the information exchanged between the
>     VNF Pool and the SFC may include some operational information of
>     the VNF Pool.
>
>     Goals and Milestones:
>
>     December 2014 - Submit VNFPool Problem Statement to IESG for
>     publication as an Informational document.
>
>     April 2015 - Submit VNFPool Use Cases to IESG for publication as
>     an Informational document.
>
>     August 2015 - Submit VNFPool Requirements, including the
>     manageability of VNF Pool to IESG for publication as an
>     Informational document.
>
>     August 2015 - Submit VNFPool Architecture to IESG for publication
>     as an Informational document.
>
>     December 2015 - Submit one or more Applicability and Gap Analysis
>     of existing protocols to VNFPool to IESG for publication as
>     Informational document(s).
>
>     ==========================================================================
>
>     Your comments and suggestions to the charter are ALWAYS highly
>     appreciated!
>
>     Thanks.
>
>     -Ning
>
>     _______________________________________________
>
>     vnfpool mailing list
>
>     vnfpool@ietf.org  <mailto:vnfpool@ietf.org>
>
>     https://www.ietf.org/mailman/listinfo/vnfpool
>

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    <small>Hi Ning,<br>
      Thank you for the reply. Some comments/suggestions to your:<br>
      * comment Z2:<span style="mso-ansi-language:EN-US" lang="EN-US"> I
        knew
        that the « elementary » NFs are part of the job, but wanted to
        suggest to add something in this section to avoid readers to
        perceive<span style="mso-spacerun:yes">  </span>the wrong
        feeling mentioned in my comment #1<br>
        * comment Z7:</span><span style="mso-ansi-language:EN-US"
        lang="EN-US"> Thank
        you for this clarification. I thus understand that three types
        of pools (and
        not more than three) may exist:<br>
             - (i) no redundancy at all, i.e., all instances
        of the pool participate actively - an upstream load balancing
        mechanism shares
        the incoming load among these instances;<br>
             - (ii) 1:1 (active-active) redundancy - for example, 5
        "images" (to avoid the word 'instance') of the VNF, and each
        of them is redundant -&gt; in this case, there are 10 instances
        running in
        parallel in the pool;<br>
             - (iii) N+K (active-standby) redundancy where some
        instances
        run actively, while others are in a dormant state.<br>
        <o:p></o:p></span>
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    <div class="moz-cite-prefix"><small>* comment Z9:<span
          style="mso-ansi-language:EN-US" lang="EN-US"> How about this
          add-on then ? "... achieved by the VNF Pool <b
            style="mso-bidi-font-weight:
            normal">architecture</b> utilized/adopted by the VNF ..."<o:p></o:p></span>
        <br>
        Best,<br>
        Chidung</small>
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        Le 19/06/2014 05:14, Zongning a écrit :</small><br>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="line-height:150%;color:#1F497D" lang="EN-US">Hi,
            Chidung,<br>
            Please see my reply enclosed in the attachment. Regarding
            comment#6, I’d like to explain that we don’t restrict to the
            case that in a pool, at a given time, there is only one
            running instance and all others are sleeping. A pool should
            be flexible to handle more cases, including multiple running
            instances and multiple standby instances.<br>
            Look forward to your further comments &amp; suggestions.<br>
            -Ning<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="line-height:150%;color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
              align="left">
              <b><span
                  style="font-size:10.0pt;font-family:宋体;color:windowtext">发
                  件人<span lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext"
                lang="EN-US"> LAC Chidung
                [<a class="moz-txt-link-freetext" href="mailto:chidung.lac@orange.com">mailto:chidung.lac@orange.com</a>]
                <br>
              </span><b><span
                  style="font-size:10.0pt;font-family:宋体;color:windowtext">发
                  送时间<span lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext"
                lang="EN-US"> 2014</span><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext">年<span
                  lang="EN-US">6</span>月<span lang="EN-US">19</span>日<span
                  lang="EN-US"> 0:40<br>
                </span><b>收件人<span lang="EN-US">:</span></b><span
                  lang="EN-US"> Zongning<br>
                </span><b>抄送<span lang="EN-US">:</span></b><span
                  lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
                </span><b>主题<span lang="EN-US">:</span></b><span
                  lang="EN-US"> Re: [vnfpool] </span>
                答复<span lang="EN-US">: Updated VNFPool Charter<o:p></o:p></span></span></p>
          </div>
        </div>
        <p class="MsoNormal" style="text-align:left" align="left"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-US">Hi Ning,<br>
            1) Is it exact that scaling out/in, one main characteristic
            of VNFs (compared to PNFs), is not included ?<br>
            2) Some comments/suggestions are enclosed.<br>
            Best,<br>
            Chidung<o:p></o:p></span></p>
        <div>
          <p class="MsoNormal"><span lang="EN-US">Le 12/06/2014 05:38,
              Zongning a écrit :<o:p></o:p></span></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Dear
              all,<br>
              Please review the charter text included in the last email.
              We are hoping that a general consensus on the charter
              could be achieved on the list, then a stable charter is
              ready for the VNFPool session in Toronto.<br>
              Thanks.<br>
              -Ning</span><span lang="EN-US"><o:p></o:p></span></p>
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
                align="left">
                <b><span style="font-size:10.0pt;font-family:宋体">发件人<span
                      lang="EN-US">:</span></span></b><span
                  style="font-size:10.0pt;font-family:宋体" lang="EN-US">
                  vnfpool [<a moz-do-not-send="true"
                    href="mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a>]
                </span><b><span style="font-size:10.0pt;font-family:宋体">代
                    表 </span></b><span
                  style="font-size:10.0pt;font-family:宋体" lang="EN-US">Zongning<br>
                </span><b><span style="font-size:10.0pt;font-family:宋体">发
                    送时间<span lang="EN-US">:</span></span></b><span
                  style="font-size:10.0pt;font-family:宋体" lang="EN-US">
                  2014</span><span
                  style="font-size:10.0pt;font-family:宋体">年<span
                    lang="EN-US">6</span>月<span lang="EN-US">12</span>日<span
                    lang="EN-US"> 11:20<br>
                  </span><b>收件人<span lang="EN-US">:</span></b><span
                    lang="EN-US"> <a moz-do-not-send="true"
                      href="mailto:vnfpool@ietf.org">
                      vnfpool@ietf.org</a><br>
                  </span><b>主题<span lang="EN-US">:</span></b><span
                    lang="EN-US"> [vnfpool] Updated VNFPool Charter</span></span><span
                  lang="EN-US"><o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal" style="text-align:left" align="left"><span
              lang="EN-US"> <o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Dear all,<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Based on the list discussion since we posted
              the last version, I have made some (minor) revision of the
              charter. The main changes are:<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
            level1 lfo2">
            <!--[if !supportLists]--><span lang="EN-US"><span
                style="mso-list:Ignore">1)<span style="font:7.0pt
                  &quot;Times New Roman&quot;">      
                </span></span></span><!--[endif]--><span lang="EN-US">State
              that service state synchronization is out of scope “in
              this phase”;<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
            level1 lfo2">
            <!--[if !supportLists]--><span lang="EN-US"><span
                style="mso-list:Ignore">2)<span style="font:7.0pt
                  &quot;Times New Roman&quot;">      
                </span></span></span><!--[endif]--><span lang="EN-US">Include
              VNF Pool with both virtualized and non-virtualized network
              function for further study;<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
            level1 lfo2">
            <!--[if !supportLists]--><span lang="EN-US"><span
                style="mso-list:Ignore">3)<span style="font:7.0pt
                  &quot;Times New Roman&quot;">      
                </span></span></span><!--[endif]--><span lang="EN-US">Explicitly
              state that the reference solution &amp; gap analysis is
              not limited to RSerPool, but open to any other solutions,
              although no decision on protocols will be made in this
              phase;<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
            level1 lfo2">
            <!--[if !supportLists]--><span lang="EN-US"><span
                style="mso-list:Ignore">4)<span style="font:7.0pt
                  &quot;Times New Roman&quot;">      
                </span></span></span><!--[endif]--><span lang="EN-US">State
              that the linkage between SFC and VNF Pool is just like a
              pool user and a pool – nothing specified (yet);<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
            level1 lfo2">
            <!--[if !supportLists]--><span lang="EN-US"><span
                style="mso-list:Ignore">5)<span style="font:7.0pt
                  &quot;Times New Roman&quot;">      
                </span></span></span><!--[endif]--><span lang="EN-US">Update
              bullet #4 under “Questions that are raised…”, to keep it
              consistent with the idea that pooling is not visible to
              the service control entity.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">==========================================================================<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Network functions such as firewalls, load
              balancers, and WAN optimizers are conventionally deployed
              as specialized hardware servers in both network operators'
              networks and data center networks as the building blocks
              of the network services. There is a trend to implement
              such network functions as software instances running on
              general purpose servers, via a virtualization layer (i.e.,
              hypervisors). These virtualized functions are called
              Virtualized Network Functions (VNFs), which can be used to
              build network services.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">The use of VNFs introduces additional
              challenges to the reliability of the provided network
              services. A single VNF instance would typically not have
              built-in reliability mechanisms on its host (i.e., a
              general purpose server). Instead, there are more factors
              of risk such as software failure at various levels
              including hypervisors and virtual machines, hardware
              failure, and instance migration that can make a VNF
              instance unreliable.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">In order to achieve higher reliability, a VNF
              may adopt a pooling mechanism, where a number of VNF
              instances with the same function can be grouped as a pool
              to provide the function. We call such a pool a VNF Pool.</span><span
              lang="DE">Conceptually, a </span><span lang="EN-US">Pool
              Manager is used to manage a VNF Pool, e.g., selects
              active/standby VNF instances, and potentially interacts
              with a service control entity.
            </span><span lang="DE">Such a </span><span lang="EN-US">service
              control entity is an entity that orchestrates a set of
              network functions to build network services. The major
              benefit of using VNF Pool is that reliability mechanisms
              such as redundancy model are achieved by the VNF Pool
              inside the VNF and thus not visible to the service control
              entity. A VNF Pool-enabled VNF still appears as a normal
              VNF when orchestrated by
            </span><span lang="DE">a </span><span lang="EN-US">service
              control entity.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Questions that are raised by the addition of
              a pooling mechanism to VNF include:<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
            level1 lfo4">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">
                </span></span></span><!--[endif]--><span lang="EN-US">How
              to manage the redundancy model, e.g., select
              active/standby VNF instances in a VNF Pool?<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
            level1 lfo4">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">
                </span></span></span><!--[endif]--><span lang="EN-US">What
              pool states need to be maintained to support the pooling
              mechanism itself, and how are such states maintained?<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
            level1 lfo4">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">
                </span></span></span><!--[endif]--><span lang="EN-US">What
              information is exchanged between a VNF and a service
              control entity? For example, how can a VNF Pool be
              addressed by the service control entity?<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
            level1 lfo4">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">
                </span></span></span><!--[endif]--><span lang="EN-CA">After
              a VNF instance failover, how does the Pool Manager notify
              the service control entity some characteristic changes of
              the VNF, e.g., capacity change, but without disclosure of
              the pooling procedure?</span><span lang="EN-US"><o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">The WG initially focuses on several
              reliability mechanisms that are mainly associated with a
              redundancy model based on a VNF Pool. Additional
              mechanisms may include pool state maintenance
            </span><span lang="DE">only for pooling purpose. Service
              state synchronization is out of scope for this phase. The
              WG</span><span lang="EN-US"> assume</span><span lang="DE">s</span><span
              lang="EN-US"> that a VNF Pool contains redundant VNF
              instances of same functional type. </span><span lang="DE">Different
              types of VNFs are envisioned to be held in separate VNF
              Pools. VNF Pool composed by both virtualized and
              non-virtualized functional instances may be included after
              further use case and requirements study. The WG will
              address the reliability of an individual VNF, but not the
              reliability related
            </span><span lang="EN-US">to the control or the routing
              between adjacent VNFs </span>
            <span lang="DE">that can form a network service</span><span
              lang="EN-US">.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Specifically, the WG will work on the
              following technical aspects:<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">          
                </span></span></span><!--[endif]--><span lang="EN-US">Redundancy
              management within a VNF Pool, such as the signaling
              between the Pool Manager and the instances in the pool for
              instance registration, backup instances selection, and
              switching between active and standby instances.<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">          
                </span></span></span><!--[endif]--><span lang="EN-US">The
              protocol between the Pool Manager and the underlying
              network to collect the network information required for
              appropriate placement/selection of backup instances.<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">          
                </span></span></span><!--[endif]--><span lang="EN-US">The
              protocol between a VNF and the service control entity to
              exchange operational information between a VNF Pool</span><span
              lang="DE"> and the service control entity.</span><span
              lang="EN-US"><o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">          
                </span></span></span><!--[endif]--><span lang="EN-US">Identify
              and analyze reliable interfaces, such as transport
              protocol like MPTCP and SCTP for reliable delivery of the
              messages associated with the redundancy management within
              a VNF Pool.<o:p></o:p></span></p>
          <p class="MsoListParagraph"
            style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="font-family:Symbol"
              lang="EN-US"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">          
                </span></span></span><!--[endif]--><span lang="EN-US">Analysis
              of pooling security characteristics and requirements to
              identify and mitigate threats against the pooling
              mechanism. Identification of an appropriate trust model
              between pool members, and between pool members and the
              Pool Manager.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">The WG plans to deliver a problem statement,
              a set of use cases, requirements and an architecture
              covering the aforementioned technical aspects, and
              applicability and gap analysis of existing technologies
              including but not limited to RSerPool. We will rely
              heavily on existing IETF technologies, but that gaps will
              be found around problems like redundancy mechanisms, state
              maintenance</span><span lang="DE"> solely for pooling
              purposes</span><span lang="EN-US">, reliable transport,
              and trust/security, all of which will need to be
              considered and addressed. Although no decision on
              protocols will be made in this phase, we will keep open
              for candidate protocols for VNF Pool. The WG will seek
              re-chartering before adopting any work to develop new, or
              extend existing, protocols.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">In particular, we will work closely with the
              SFC WG, as we believe that SFC and VNF Pool are
              independent but complementary. SFC would essentially see a
              VNF Pool-enabled VNF as a normal service function and
              therefore be able to merge it into an SFC just like any
              other service functions. Just like the communication
              between any pool users and VNF Pool, the information
              exchanged between the VNF Pool and the SFC may include
              some operational information of the VNF Pool.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Goals and Milestones:<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">December 2014 - Submit VNFPool Problem
              Statement to IESG for publication as an Informational
              document.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">April 2015 - Submit VNFPool Use Cases to IESG
              for publication as an Informational document.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">August 2015 - Submit VNFPool Requirements,
              including the manageability of VNF Pool to IESG for
              publication as an Informational document.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">August 2015 - Submit VNFPool Architecture to
              IESG for publication as an Informational document.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">December 2015 - Submit one or more
              Applicability and Gap Analysis of existing protocols to
              VNFPool to IESG for publication as Informational
              document(s).<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">==========================================================================<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Your comments and suggestions to the charter
              are ALWAYS highly appreciated!<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">Thanks.<o:p></o:p></span></p>
          <p class="MsoNormal" style="line-height:normal"><span
              lang="EN-US">-Ning<o:p></o:p></span></p>
          <pre><span lang="EN-US">_______________________________________________<o:p></o:p></span></pre>
          <pre><span lang="EN-US">vnfpool mailing list<o:p></o:p></span></pre>
          <pre><span lang="EN-US"><a moz-do-not-send="true" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><o:p></o:p></span></pre>
          <pre><span lang="EN-US"><a moz-do-not-send="true" href="https://www.ietf.org/mailman/listinfo/vnfpool">https://www.ietf.org/mailman/listinfo/vnfpool</a><o:p></o:p></span></pre>
        </blockquote>
      </div>
    </blockquote>
  </body>
</html>

--------------090108010508030307030402--


From nobody Thu Jun 26 08:55:22 2014
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From: Thomas Dreibholz <dreibh@iem.uni-due.de>
To: multipathtcp@ietf.org, rserpool@ietf.org, vnfpool@ietf.org, iccrg@irtf.org
Date: Thu, 26 Jun 2014 16:56:31 +0200
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Subject: [vnfpool] The 2nd NorNet Users Workshop (NNUW-2)
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[Our apologies if you receive multiple copies of this message.]


CALL FOR PARTICIPATION

We cordially invite you to join us at:

The 2nd International NorNet Users Workshop (NNUW-2)
at the Simula Research Laboratory in Fornebu, Akershus/Norway
August 28-29, 2014
https://www.nntb.no/workshops/nnuw-2/

The registration opens soon! Please register as early as possible.


More than one year ago, the NorNet project has started with the intenti=
on to=20
build up the world=E2=80=99s first large-scale network  testbed for mul=
ti-homed=20
systems. NorNet should provide researchers the possibility to perform=20=

experiments in real-world wired and wireless setups. Now, the wired par=
t =E2=80=93=20
denoted as NorNet Core =E2=80=93 as well as the wireless part =E2=80=93=
 denoted as NorNet Edge=20
=E2=80=93 have reached a stage that allows further researchers to start=
 running such=20
experiments. That is, currently 14 NorNet Core sites and more than 300 =
NorNet=20
Edge nodes are ready to support your research ideas on resilience, mobi=
lity,=20
security, multi-path transport and further subjects!

This workshop intends to provide current as well as new and future NorN=
et=20
users the possibility to get information about the NorNet testbed and i=
nitial=20
research results, to discuss their ideas with the testbed developers an=
d to=20
get the possibility for obtaining access to NorNet.


Further details on the workshop are available at:
https://www.nntb.no/workshops/nnuw-2/

An information sheet in PDF format can be found here:
https://www.nntb.no/wp-content/uploads/2014/05/NNUW-2-CallForParticipat=
ion.pdf

A detailed description of NorNet can be found at:
https://www.nntb.no/


We are looking forward to see you in Fornebu!


The NNUW-2 Organisers


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Hi Ning,
1- On further consideration, my remark (i) in the previous e-mail ("/no 
redundancy at all ...../") should not be applied in the VNF context if 
the intention is to use a pool for redundancy purposes *while minimizing 
the needed resources*. As shown in the figure enclosed, this PNF scheme 
(no redundancy at all, i.e., all instances of the pool participate 
actively) is not applicable in the VNF framework where additional 
instances are created *only* if needed.
2- Back to your e-mail of June 19th "/the VNF instance scaling within a 
VNF pool is included in the charter/": I don't think "scaling", 
"scalability" appearing in the charter - it would be nice to introduce a 
sentence (somewhere) with one of these two words to avoid this 
ambiguity. Again, scaling in/out is one main characteristic of VNF.
Best,
Chidung

Le 27/06/2014 03:36, Zongning a écrit :
>
> Hi, Chidung,
> Thanks for your suggestions. I will make the text clear for comment 
> Z2. But for comment Z9, I’d prefer to keep “VNF Pool”, as we don’t 
> propose/discuss a concrete VNF Pool architecture in the charter, but 
> just introduce a general concept.
> Look forward to your further comments.
> -Ning
>
> *发 件人:*LAC Chidung [mailto:chidung.lac@orange.com]
> *发 送时间:*2014年6月26日22:53
> *收件人:*Zongning
> *抄送:*vnfpool@ietf.org
> *主题:*Re: 答复: [vnfpool] 答复: Updated VNFPool Charter
>
> Hi Ning,
> Thank you for the reply. Some comments/suggestions to your:
> * comment Z2: I knew that the « elementary » NFs are part of the job, 
> but wanted to suggest to add something in this section to avoid 
> readers to perceive  the wrong feeling mentioned in my comment #1
> * comment Z7: Thank you for this clarification. I thus understand that 
> three types of pools (and not more than three) may exist:
>      - (i) no redundancy at all, i.e., all instances of the pool 
> participate actively - an upstream load balancing mechanism shares the 
> incoming load among these instances;
>      - (ii) 1:1 (active-active) redundancy - for example, 5 "images" 
> (to avoid the word 'instance') of the VNF, and each of them is 
> redundant -> in this case, there are 10 instances running in parallel 
> in the pool;
>      - (iii) N+K (active-standby) redundancy where some instances run 
> actively, while others are in a dormant state.
>
> * comment Z9: How about this add-on then ? "... achieved by the VNF 
> Pool *architecture* utilized/adopted by the VNF ..."
> Best,
> Chidung
>
> Le 19/06/2014 05:14, Zongning a écrit :
>
>     Hi, Chidung,
>     Please see my reply enclosed in the attachment. Regarding
>     comment#6, I’d like to explain that we don’t restrict to the case
>     that in a pool, at a given time, there is only one running
>     instance and all others are sleeping. A pool should be flexible to
>     handle more cases, including multiple running instances and
>     multiple standby instances.
>     Look forward to your further comments & suggestions.
>     -Ning
>
>     *发 件人:*LAC Chidung [mailto:chidung.lac@orange.com]
>     *发 送时间:* 2014年6月19日 0:40
>     *收件人:* Zongning
>     *抄送:* vnfpool@ietf.org <mailto:vnfpool@ietf.org>
>     *主题:* Re: [vnfpool] 答复: Updated VNFPool Charter
>
>     Hi Ning,
>     1) Is it exact that scaling out/in, one main characteristic of
>     VNFs (compared to PNFs), is not included ?
>     2) Some comments/suggestions are enclosed.
>     Best,
>     Chidung
>
>     Le 12/06/2014 05:38, Zongning a écrit :
>
>         Dear all,
>         Please review the charter text included in the last email. We
>         are hoping that a general consensus on the charter could be
>         achieved on the list, then a stable charter is ready for the
>         VNFPool session in Toronto.
>         Thanks.
>         -Ning
>
>         *发件人:*vnfpool [mailto:vnfpool-bounces@ietf.org] *代 表
>         *Zongning
>         *发 送时间:* 2014年6月12日 11:20
>         *收件人:* vnfpool@ietf.org <mailto:vnfpool@ietf.org>
>         *主题:* [vnfpool] Updated VNFPool Charter
>
>         Dear all,
>
>         Based on the list discussion since we posted the last version,
>         I have made some (minor) revision of the charter. The main
>         changes are:
>
>         1)State that service state synchronization is out of scope “in
>         this phase”;
>
>         2)Include VNF Pool with both virtualized and non-virtualized
>         network function for further study;
>
>         3)Explicitly state that the reference solution & gap analysis
>         is not limited to RSerPool, but open to any other solutions,
>         although no decision on protocols will be made in this phase;
>
>         4)State that the linkage between SFC and VNF Pool is just like
>         a pool user and a pool – nothing specified (yet);
>
>         5)Update bullet #4 under “Questions that are raised…”, to keep
>         it consistent with the idea that pooling is not visible to the
>         service control entity.
>
>         ==========================================================================
>
>         Network functions such as firewalls, load balancers, and WAN
>         optimizers are conventionally deployed as specialized hardware
>         servers in both network operators' networks and data center
>         networks as the building blocks of the network services. There
>         is a trend to implement such network functions as software
>         instances running on general purpose servers, via a
>         virtualization layer (i.e., hypervisors). These virtualized
>         functions are called Virtualized Network Functions (VNFs),
>         which can be used to build network services.
>
>         The use of VNFs introduces additional challenges to the
>         reliability of the provided network services. A single VNF
>         instance would typically not have built-in reliability
>         mechanisms on its host (i.e., a general purpose server).
>         Instead, there are more factors of risk such as software
>         failure at various levels including hypervisors and virtual
>         machines, hardware failure, and instance migration that can
>         make a VNF instance unreliable.
>
>         In order to achieve higher reliability, a VNF may adopt a
>         pooling mechanism, where a number of VNF instances with the
>         same function can be grouped as a pool to provide the
>         function. We call such a pool a VNF Pool.Conceptually, a Pool
>         Manager is used to manage a VNF Pool, e.g., selects
>         active/standby VNF instances, and potentially interacts with a
>         service control entity. Such a service control entity is an
>         entity that orchestrates a set of network functions to build
>         network services. The major benefit of using VNF Pool is that
>         reliability mechanisms such as redundancy model are achieved
>         by the VNF Pool inside the VNF and thus not visible to the
>         service control entity. A VNF Pool-enabled VNF still appears
>         as a normal VNF when orchestrated by a service control entity.
>
>         Questions that are raised by the addition of a pooling
>         mechanism to VNF include:
>
>         ·How to manage the redundancy model, e.g., select
>         active/standby VNF instances in a VNF Pool?
>
>         ·What pool states need to be maintained to support the pooling
>         mechanism itself, and how are such states maintained?
>
>         ·What information is exchanged between a VNF and a service
>         control entity? For example, how can a VNF Pool be addressed
>         by the service control entity?
>
>         ·After a VNF instance failover, how does the Pool Manager
>         notify the service control entity some characteristic changes
>         of the VNF, e.g., capacity change, but without disclosure of
>         the pooling procedure?
>
>         The WG initially focuses on several reliability mechanisms
>         that are mainly associated with a redundancy model based on a
>         VNF Pool. Additional mechanisms may include pool state
>         maintenance only for pooling purpose. Service state
>         synchronization is out of scope for this phase. The
>         WGassumesthat a VNF Pool contains redundant VNF instances of
>         same functional type. Different types of VNFs are envisioned
>         to be held in separate VNF Pools. VNF Pool composed by both
>         virtualized and non-virtualized functional instances may be
>         included after further use case and requirements study. The WG
>         will address the reliability of an individual VNF, but not the
>         reliability related to the control or the routing between
>         adjacent VNFs that can form a network service.
>
>         Specifically, the WG will work on the following technical aspects:
>
>         ·Redundancy management within a VNF Pool, such as the
>         signaling between the Pool Manager and the instances in the
>         pool for instance registration, backup instances selection,
>         and switching between active and standby instances.
>
>         ·The protocol between the Pool Manager and the underlying
>         network to collect the network information required for
>         appropriate placement/selection of backup instances.
>
>         ·The protocol between a VNF and the service control entity to
>         exchange operational information between a VNF Pooland the
>         service control entity.
>
>         ·Identify and analyze reliable interfaces, such as transport
>         protocol like MPTCP and SCTP for reliable delivery of the
>         messages associated with the redundancy management within a
>         VNF Pool.
>
>         ·Analysis of pooling security characteristics and requirements
>         to identify and mitigate threats against the pooling
>         mechanism. Identification of an appropriate trust model
>         between pool members, and between pool members and the Pool
>         Manager.
>
>         The WG plans to deliver a problem statement, a set of use
>         cases, requirements and an architecture covering the
>         aforementioned technical aspects, and applicability and gap
>         analysis of existing technologies including but not limited to
>         RSerPool. We will rely heavily on existing IETF technologies,
>         but that gaps will be found around problems like redundancy
>         mechanisms, state maintenancesolely for pooling purposes,
>         reliable transport, and trust/security, all of which will need
>         to be considered and addressed. Although no decision on
>         protocols will be made in this phase, we will keep open for
>         candidate protocols for VNF Pool. The WG will seek
>         re-chartering before adopting any work to develop new, or
>         extend existing, protocols.
>
>         In particular, we will work closely with the SFC WG, as we
>         believe that SFC and VNF Pool are independent but
>         complementary. SFC would essentially see a VNF Pool-enabled
>         VNF as a normal service function and therefore be able to
>         merge it into an SFC just like any other service functions.
>         Just like the communication between any pool users and VNF
>         Pool, the information exchanged between the VNF Pool and the
>         SFC may include some operational information of the VNF Pool.
>
>         Goals and Milestones:
>
>         December 2014 - Submit VNFPool Problem Statement to IESG for
>         publication as an Informational document.
>
>         April 2015 - Submit VNFPool Use Cases to IESG for publication
>         as an Informational document.
>
>         August 2015 - Submit VNFPool Requirements, including the
>         manageability of VNF Pool to IESG for publication as an
>         Informational document.
>
>         August 2015 - Submit VNFPool Architecture to IESG for
>         publication as an Informational document.
>
>         December 2015 - Submit one or more Applicability and Gap
>         Analysis of existing protocols to VNFPool to IESG for
>         publication as Informational document(s).
>
>         ==========================================================================
>
>         Your comments and suggestions to the charter are ALWAYS highly
>         appreciated!
>
>         Thanks.
>
>         -Ning
>
>         _______________________________________________
>
>         vnfpool mailing list
>
>         vnfpool@ietf.org  <mailto:vnfpool@ietf.org>
>
>         https://www.ietf.org/mailman/listinfo/vnfpool
>

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    <small>Hi Ning,<br>
      1- On further consideration, my remark (i) in the previous e-mail
      ("<i>no redundancy at all .....</i>") should not be applied in the
      VNF context if the intention is to use a pool for redundancy
      purposes <b>while minimizing the needed resources</b>. As shown
      in the figure enclosed, this PNF scheme (no redundancy at all,
      i.e., all instances of the pool participate actively) is not
      applicable in the VNF framework where additional instances are
      created <b>only</b> if needed.<br>
      2- Back to your e-mail of June 19th "<i>the VNF instance scaling
        within a VNF pool is included in the charter</i>": I don't think
      "scaling", "scalability" appearing in the charter - it would be
      nice to introduce a sentence (somewhere) with one of these two
      words to avoid this ambiguity. Again, scaling in/out is one main
      characteristic of VNF.<br>
      Best,<br>
      Chidung<br>
      <br>
    </small>
    <div class="moz-cite-prefix"><small>Le 27/06/2014 03:36, Zongning a
        écrit :</small><br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="line-height:150%;color:#1F497D" lang="EN-US">Hi,
            Chidung,<br>
            Thanks for your suggestions. I will make the text clear for
            comment Z2. But for comment Z9, I’d prefer to keep “VNF
            Pool”, as we don’t propose/discuss a concrete VNF Pool
            architecture in the charter, but just introduce a general
            concept.<br>
            Look forward to your further comments.<br>
            -Ning<o:p></o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
              align="left">
              <b><span
                  style="font-size:10.0pt;font-family:宋体;color:windowtext">发
                  件人<span lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext"
                lang="EN-US"> LAC Chidung
                [<a class="moz-txt-link-freetext" href="mailto:chidung.lac@orange.com">mailto:chidung.lac@orange.com</a>]
                <br>
              </span><b><span
                  style="font-size:10.0pt;font-family:宋体;color:windowtext">发
                  送时间<span lang="EN-US">:</span></span></b><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext"
                lang="EN-US"> 2014</span><span
                style="font-size:10.0pt;font-family:宋体;color:windowtext">年<span
                  lang="EN-US">6</span>月<span lang="EN-US">26</span>日<span
                  lang="EN-US"> 22:53<br>
                </span><b>收件人<span lang="EN-US">:</span></b><span
                  lang="EN-US"> Zongning<br>
                </span><b>抄送<span lang="EN-US">:</span></b><span
                  lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
                </span><b>主题<span lang="EN-US">:</span></b><span
                  lang="EN-US"> Re: </span>答复<span lang="EN-US">:
                  [vnfpool]
                </span>答复<span lang="EN-US">: Updated VNFPool Charter<o:p></o:p></span></span></p>
          </div>
        </div>
        <p class="MsoNormal" style="text-align:left" align="left"><span
            lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="line-height:normal"><span
            style="font-size:10.0pt" lang="EN-US">Hi Ning,<br>
            Thank you for the reply. Some comments/suggestions to your:<br>
            * comment Z2: I knew that the « elementary » NFs are part of
            the job, but wanted to suggest to add something in this
            section to avoid readers to perceive  the wrong feeling
            mentioned in my comment #1<br>
            * comment Z7: Thank you for this clarification. I thus
            understand that three types of pools (and not more than
            three) may exist:<br>
                 - (i) no redundancy at all, i.e., all instances of the
            pool participate actively - an upstream load balancing
            mechanism shares the incoming load among these instances;<br>
                 - (ii) 1:1 (active-active) redundancy - for example, 5
            "images" (to avoid the word 'instance') of the VNF, and each
            of them is redundant -&gt; in this case, there are 10
            instances running in parallel in the pool;<br>
                 - (iii) N+K (active-standby) redundancy where some
            instances run actively, while others are in a dormant state.<br>
          </span></p>
        <div>
          <p class="MsoNormal" style="line-height:normal"><span
              style="font-size:10.0pt;font-family:宋体" lang="EN-US">*
              comment Z9: How about this add-on then ? "... achieved by
              the VNF Pool
              <b>architecture</b> utilized/adopted by the VNF ..." <br>
              Best,<br>
              Chidung</span><span
              style="font-size:12.0pt;font-family:宋体" lang="EN-US"> <br>
            </span><span style="font-size:10.0pt;font-family:宋体"
              lang="EN-US"><br>
              Le 19/06/2014 05:14, Zongning a écrit :</span><span
              style="font-size:12.0pt;font-family:宋体" lang="EN-US"><o:p></o:p></span></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Hi,
              Chidung,<br>
              Please see my reply enclosed in the attachment. Regarding
              comment#6, I’d like to explain that we don’t restrict to
              the case that in a pool, at a given time, there is only
              one running instance and all others are sleeping. A pool
              should be flexible to handle more cases, including
              multiple running instances and multiple standby instances.<br>
              Look forward to your further comments &amp; suggestions.<br>
              -Ning</span><span lang="EN-US"><o:p></o:p></span></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><span
              lang="EN-US"><o:p></o:p></span></p>
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
                align="left">
                <b><span
                    style="font-size:10.0pt;font-family:宋体;color:windowtext"
                    lang="EN-US">发 件人:</span></b><span
                  style="font-size:10.0pt;font-family:宋体;color:windowtext"
                  lang="EN-US"> LAC Chidung [<a moz-do-not-send="true"
                    href="mailto:chidung.lac@orange.com">mailto:chidung.lac@orange.com</a>]
                  <br>
                  <b>发 送时间:</b> 2014年6月19日 0:40<br>
                  <b>收件人:</b> Zongning<br>
                  <b>抄送:</b> <a moz-do-not-send="true"
                    href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
                  <b>主题:</b> Re: [vnfpool] 答复: Updated VNFPool Charter</span><span
                  lang="EN-US"><o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal" style="text-align:left" align="left"><span
              lang="EN-US"> <o:p></o:p></span></p>
          <p class="MsoNormal"><span lang="EN-US">Hi Ning,<br>
              1) Is it exact that scaling out/in, one main
              characteristic of VNFs (compared to PNFs), is not included
              ?<br>
              2) Some comments/suggestions are enclosed.<br>
              Best,<br>
              Chidung<o:p></o:p></span></p>
          <div>
            <p class="MsoNormal"><span lang="EN-US">Le 12/06/2014 05:38,
                Zongning a écrit :<o:p></o:p></span></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <p class="MsoNormal"><span style="color:#1F497D"
                lang="EN-US">Dear all,<br>
                Please review the charter text included in the last
                email. We are hoping that a general consensus on the
                charter could be achieved on the list, then a stable
                charter is ready for the VNFPool session in Toronto.<br>
                Thanks.<br>
                -Ning</span><span lang="EN-US"><o:p></o:p></span></p>
            <div>
              <div style="border:none;border-top:solid #B5C4DF
                1.0pt;padding:3.0pt 0cm 0cm 0cm">
                <p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt;text-align:left;line-height:normal"
                  align="left">
                  <b><span style="font-size:10.0pt;font-family:宋体"
                      lang="EN-US">发件人:</span></b><span
                    style="font-size:10.0pt;font-family:宋体" lang="EN-US">
                    vnfpool [<a moz-do-not-send="true"
                      href="mailto:vnfpool-bounces@ietf.org">mailto:vnfpool-bounces@ietf.org</a>]
                    <b>代 表 </b>Zongning<br>
                    <b>发 送时间:</b> 2014年6月12日 11:20<br>
                    <b>收件人:</b> <a moz-do-not-send="true"
                      href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><br>
                    <b>主题:</b> [vnfpool] Updated VNFPool Charter</span><span
                    lang="EN-US"><o:p></o:p></span></p>
              </div>
            </div>
            <p class="MsoNormal" style="text-align:left" align="left"><span
                lang="EN-US"> <o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Dear all,<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Based on the list discussion since we
                posted the last version, I have made some (minor)
                revision of the charter. The main changes are:<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
              level1 lfo2">
              <!--[if !supportLists]--><span lang="EN-US"><span
                  style="mso-list:Ignore">1)<span style="font:7.0pt
                    &quot;Times New Roman&quot;">      
                  </span></span></span><!--[endif]--><span lang="EN-US">State
                that service state synchronization is out of scope “in
                this phase”;<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
              level1 lfo2">
              <!--[if !supportLists]--><span lang="EN-US"><span
                  style="mso-list:Ignore">2)<span style="font:7.0pt
                    &quot;Times New Roman&quot;">      
                  </span></span></span><!--[endif]--><span lang="EN-US">Include
                VNF Pool with both virtualized and non-virtualized
                network function for further study;<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
              level1 lfo2">
              <!--[if !supportLists]--><span lang="EN-US"><span
                  style="mso-list:Ignore">3)<span style="font:7.0pt
                    &quot;Times New Roman&quot;">      
                  </span></span></span><!--[endif]--><span lang="EN-US">Explicitly
                state that the reference solution &amp; gap analysis is
                not limited to RSerPool, but open to any other
                solutions, although no decision on protocols will be
                made in this phase;<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
              level1 lfo2">
              <!--[if !supportLists]--><span lang="EN-US"><span
                  style="mso-list:Ignore">4)<span style="font:7.0pt
                    &quot;Times New Roman&quot;">      
                  </span></span></span><!--[endif]--><span lang="EN-US">State
                that the linkage between SFC and VNF Pool is just like a
                pool user and a pool – nothing specified (yet);<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:35.85pt;text-indent:-18.0pt;line-height:normal;mso-list:l0
              level1 lfo2">
              <!--[if !supportLists]--><span lang="EN-US"><span
                  style="mso-list:Ignore">5)<span style="font:7.0pt
                    &quot;Times New Roman&quot;">      
                  </span></span></span><!--[endif]--><span lang="EN-US">Update
                bullet #4 under “Questions that are raised…”, to keep it
                consistent with the idea that pooling is not visible to
                the service control entity.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">==========================================================================<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Network functions such as firewalls, load
                balancers, and WAN optimizers are conventionally
                deployed as specialized hardware servers in both network
                operators' networks and data center networks as the
                building blocks of the network services. There is a
                trend to implement such network functions as software
                instances running on general purpose servers, via a
                virtualization layer (i.e., hypervisors). These
                virtualized functions are called Virtualized Network
                Functions (VNFs), which can be used to build network
                services.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">The use of VNFs introduces additional
                challenges to the reliability of the provided network
                services. A single VNF instance would typically not have
                built-in reliability mechanisms on its host (i.e., a
                general purpose server). Instead, there are more factors
                of risk such as software failure at various levels
                including hypervisors and virtual machines, hardware
                failure, and instance migration that can make a VNF
                instance unreliable.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">In order to achieve higher reliability, a
                VNF may adopt a pooling mechanism, where a number of VNF
                instances with the same function can be grouped as a
                pool to provide the function. We call such a pool a VNF
                Pool.</span><span lang="DE">Conceptually, a </span><span
                lang="EN-US">Pool Manager is used to manage a VNF Pool,
                e.g., selects active/standby VNF instances, and
                potentially interacts with a service control entity.
              </span><span lang="DE">Such a </span><span lang="EN-US">service
                control entity is an entity that orchestrates a set of
                network functions to build network services. The major
                benefit of using VNF Pool is that reliability mechanisms
                such as redundancy model are achieved by the VNF Pool
                inside the VNF and thus not visible to the service
                control entity. A VNF Pool-enabled VNF still appears as
                a normal VNF when orchestrated by
              </span><span lang="DE">a </span><span lang="EN-US">service
                control entity.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Questions that are raised by the addition
                of a pooling mechanism to VNF include:<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
              level1 lfo4">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">    
                  </span></span></span><!--[endif]--><span lang="EN-US">How
                to manage the redundancy model, e.g., select
                active/standby VNF instances in a VNF Pool?<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
              level1 lfo4">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">    
                  </span></span></span><!--[endif]--><span lang="EN-US">What
                pool states need to be maintained to support the pooling
                mechanism itself, and how are such states maintained?<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
              level1 lfo4">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">    
                  </span></span></span><!--[endif]--><span lang="EN-US">What
                information is exchanged between a VNF and a service
                control entity? For example, how can a VNF Pool be
                addressed by the service control entity?<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:24.6pt;text-indent:-3.6pt;line-height:normal;mso-list:l2
              level1 lfo4">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">    
                  </span></span></span><!--[endif]--><span lang="EN-CA">After
                a VNF instance failover, how does the Pool Manager
                notify the service control entity some characteristic
                changes of the VNF, e.g., capacity change, but without
                disclosure of the pooling procedure?</span><span
                lang="EN-US"><o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">The WG initially focuses on several
                reliability mechanisms that are mainly associated with a
                redundancy model based on a VNF Pool. Additional
                mechanisms may include pool state maintenance
              </span><span lang="DE">only for pooling purpose. Service
                state synchronization is out of scope for this phase.
                The WG</span><span lang="EN-US"> assume</span><span
                lang="DE">s</span><span lang="EN-US"> that a VNF Pool
                contains redundant VNF instances of same functional
                type. </span><span lang="DE">Different types of VNFs
                are envisioned to be held in separate VNF Pools. VNF
                Pool composed by both virtualized and non-virtualized
                functional instances may be included after further use
                case and requirements study. The WG will address the
                reliability of an individual VNF, but not the
                reliability related
              </span><span lang="EN-US">to the control or the routing
                between adjacent VNFs </span>
              <span lang="DE">that can form a network service</span><span
                lang="EN-US">.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Specifically, the WG will work on the
                following technical aspects:<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
              level1 lfo6">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">          
                  </span></span></span><!--[endif]--><span lang="EN-US">Redundancy
                management within a VNF Pool, such as the signaling
                between the Pool Manager and the instances in the pool
                for instance registration, backup instances selection,
                and switching between active and standby instances.<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
              level1 lfo6">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">          
                  </span></span></span><!--[endif]--><span lang="EN-US">The
                protocol between the Pool Manager and the underlying
                network to collect the network information required for
                appropriate placement/selection of backup instances.<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
              level1 lfo6">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">          
                  </span></span></span><!--[endif]--><span lang="EN-US">The
                protocol between a VNF and the service control entity to
                exchange operational information between a VNF Pool</span><span
                lang="DE"> and the service control entity.</span><span
                lang="EN-US"><o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
              level1 lfo6">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">          
                  </span></span></span><!--[endif]--><span lang="EN-US">Identify
                and analyze reliable interfaces, such as transport
                protocol like MPTCP and SCTP for reliable delivery of
                the messages associated with the redundancy management
                within a VNF Pool.<o:p></o:p></span></p>
            <p class="MsoListParagraph"
              style="margin-left:38.85pt;text-indent:-21.0pt;line-height:normal;mso-list:l1
              level1 lfo6">
              <!--[if !supportLists]--><span style="font-family:Symbol"
                lang="EN-US"><span style="mso-list:Ignore">·<span
                    style="font:7.0pt &quot;Times New Roman&quot;">          
                  </span></span></span><!--[endif]--><span lang="EN-US">Analysis
                of pooling security characteristics and requirements to
                identify and mitigate threats against the pooling
                mechanism. Identification of an appropriate trust model
                between pool members, and between pool members and the
                Pool Manager.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">The WG plans to deliver a problem
                statement, a set of use cases, requirements and an
                architecture covering the aforementioned technical
                aspects, and applicability and gap analysis of existing
                technologies including but not limited to RSerPool. We
                will rely heavily on existing IETF technologies, but
                that gaps will be found around problems like redundancy
                mechanisms, state maintenance</span><span lang="DE">
                solely for pooling purposes</span><span lang="EN-US">,
                reliable transport, and trust/security, all of which
                will need to be considered and addressed. Although no
                decision on protocols will be made in this phase, we
                will keep open for candidate protocols for VNF Pool. The
                WG will seek re-chartering before adopting any work to
                develop new, or extend existing, protocols.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">In particular, we will work closely with
                the SFC WG, as we believe that SFC and VNF Pool are
                independent but complementary. SFC would essentially see
                a VNF Pool-enabled VNF as a normal service function and
                therefore be able to merge it into an SFC just like any
                other service functions. Just like the communication
                between any pool users and VNF Pool, the information
                exchanged between the VNF Pool and the SFC may include
                some operational information of the VNF Pool.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Goals and Milestones:<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">December 2014 - Submit VNFPool Problem
                Statement to IESG for publication as an Informational
                document.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">April 2015 - Submit VNFPool Use Cases to
                IESG for publication as an Informational document.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">August 2015 - Submit VNFPool Requirements,
                including the manageability of VNF Pool to IESG for
                publication as an Informational document.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">August 2015 - Submit VNFPool Architecture
                to IESG for publication as an Informational document.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">December 2015 - Submit one or more
                Applicability and Gap Analysis of existing protocols to
                VNFPool to IESG for publication as Informational
                document(s).<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">==========================================================================<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Your comments and suggestions to the
                charter are ALWAYS highly appreciated!<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">Thanks.<o:p></o:p></span></p>
            <p class="MsoNormal" style="line-height:normal"><span
                lang="EN-US">-Ning<o:p></o:p></span></p>
            <pre><span lang="EN-US">_______________________________________________<o:p></o:p></span></pre>
            <pre><span lang="EN-US">vnfpool mailing list<o:p></o:p></span></pre>
            <pre><span lang="EN-US"><a moz-do-not-send="true" href="mailto:vnfpool@ietf.org">vnfpool@ietf.org</a><o:p></o:p></span></pre>
            <pre><span lang="EN-US"><a moz-do-not-send="true" href="https://www.ietf.org/mailman/listinfo/vnfpool">https://www.ietf.org/mailman/listinfo/vnfpool</a><o:p></o:p></span></pre>
          </blockquote>
        </blockquote>
      </div>
    </blockquote>
  </body>
</html>

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Subject: [vnfpool] Call for BoF agenda items
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Dear all,

Melinda and I will work out a VNFPool BoF draft agenda by this week. Curren=
tly we have the following drafts/topics:

1)       Problems

https://datatracker.ietf.org/doc/draft-zong-vnfpool-problem-statement/

2)       Use Cases

http://tools.ietf.org/html/draft-king-vnfpool-mobile-use-case-01

http://tools.ietf.org/html/draft-xia-vnfpool-use-cases-01

https://datatracker.ietf.org/doc/draft-hares-vnf-pool-use-case/

3)       Related Work

https://datatracker.ietf.org/doc/draft-dreibholz-vnfpool-rserpool-applic/

4)       Charter

http://www.ietf.org/mail-archive/web/vnfpool/current/msg00321.html


Note that although we will spend more time on the charter discussion in the=
 BoF, any other drafts such as architecture or requirements for VNF Pool ar=
e also welcome!
Please let us know if you plan to submit any other drafts, and need time sl=
ot in the BoF to present them.

Thanks.

-Melinda & Ning

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Melinda and I will work out a V=
NFPool BoF draft agenda by this week. Currently we have the following draft=
s/topics:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Problems<o:p></o:p></sp=
an></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><a href=3D"https://datatracker.ietf.org/doc/draft-zong=
-vnfpool-problem-statement/">https://datatracker.ietf.org/doc/draft-zong-vn=
fpool-problem-statement/</a><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Use Cases<o:p></o:p></s=
pan></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><a href=3D"http://tools.ietf.org/html/draft-king-vnfpo=
ol-mobile-use-case-01">http://tools.ietf.org/html/draft-king-vnfpool-mobile=
-use-case-01</a><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-GB" style=3D"color:#1F497D"><a href=3D"http://tools.ietf.o=
rg/html/draft-xia-vnfpool-use-cases-01">http://tools.ietf.org/html/draft-xi=
a-vnfpool-use-cases-01</a></span><span lang=3D"EN-US"><o:p></o:p></span></p=
>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><a href=3D"https://datatracker.ietf.org/doc/draft-hare=
s-vnf-pool-use-case/">https://datatracker.ietf.org/doc/draft-hares-vnf-pool=
-use-case/</a><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Related Work<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><a href=3D"https://datatracker.ietf.org/doc/draft-drei=
bholz-vnfpool-rserpool-applic/">https://datatracker.ietf.org/doc/draft-drei=
bholz-vnfpool-rserpool-applic/</a><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Charter<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><a href=3D"http://www.ietf.org/mail-archive/web/vnfpoo=
l/current/msg00321.html">http://www.ietf.org/mail-archive/web/vnfpool/curre=
nt/msg00321.html</a><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:18.0pt;text-indent:0cm">=
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Note that although we will spen=
d more time on the charter discussion in the BoF, any other drafts such as =
architecture or requirements for VNF Pool are also welcome!<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please let us know if you plan =
to submit any other drafts, and need time slot in the BoF to present them.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Melinda &amp; Ning<o:p></o:p><=
/span></p>
</div>
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: LAC Chidung <chidung.lac@orange.com>, Zongning <zongning@huawei.com>
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