Re: [Teas] Network Slicing design team definitions - isolation and resolution
Daniele Ceccarelli <daniele.ceccarelli@ericsson.com> Thu, 30 April 2020 08:43 UTC
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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
To: Kiran Makhijani <kiranm@futurewei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, Greg Mirsky <gregimirsky@gmail.com>
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Thread-Topic: [Teas] Network Slicing design team definitions - isolation and resolution
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Date: Thu, 30 Apr 2020 08:43:11 +0000
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Subject: Re: [Teas] Network Slicing design team definitions - isolation and resolution
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Hi Kiran, I agree with Joel on the fact that we don’t need this distinction. I don’t think the customer of the slice needs a complete separation, what is needed is a given performance. If for some reasons there is the need to something totally dedicated with no interference, where there are the good old leased lines, right? Cheers, Daniele From: Teas <teas-bounces@ietf.org> On Behalf Of Kiran Makhijani Sent: den 30 april 2020 06:47 To: Joel M. Halpern <jmh@joelhalpern.com>; Greg Mirsky <gregimirsky@gmail.com> Cc: teas@ietf.org Subject: Re: [Teas] Network Slicing design team definitions - isolation and resolution A lot of this should be seen in the context of why would we do slices? The way I see it - it is about supporting diverse set of services with their own set of SLOs. A few of those services really need complete separation and no interference, while others will have some wiggle room ( tolerance to some amount of interference). I am ok with what we call it - but both should be possible. Seems to me most of the discussion we have had are in the generic sense and not considering the slicing aspect. -Kiran Regards Kiran ________________________________ From: Teas <teas-bounces@ietf.org<mailto:teas-bounces@ietf.org>> on behalf of Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>> Sent: Wednesday, April 29, 2020 8:22:37 PM To: Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>> Cc: teas@ietf.org<mailto:teas@ietf.org> <teas@ietf.org<mailto:teas@ietf.org>> Subject: Re: [Teas] Network Slicing design team definitions - isolation and resolution I have never seen a good or useful distinction between hard and soft isolation. The one described in the draft (based on causes of failure) is not effective. Everything has a confidence / reliability / variability. some are better than 5 9s. And some are one 9. Niether is hard. And neither is soft. Yours, Joel On 4/29/2020 11:13 PM, Greg Mirsky wrote: > Hi Igor, > I agree with you but with some clarification. If we, as in the draft, > introduce the notion of "hard isolation" and "soft isolation", then, in > my opinion, we acknowledge that in some cases isolation is not > guaranteed. Hence, everything that you've said is the case for hard > isolation. But for soft isolation, I think, a network might be affected > by another network. > What is your opinion on hard vs. soft isolation? > > Regards, > Greg > > On Tue, Apr 28, 2020 at 10:52 AM Igor Bryskin <i_bryskin@yahoo.com <mailto:i_bryskin@yahoo.com%20%0b>> <mailto:i_bryskin@yahoo.com>> wrote: > > Hi Greg, > > Flow isolation and network isolation are different things. For > example, you do not expect receiving data in one network broadcasted > over properly isolated another network. Likewise, you do not expect > congestion in one network caused by an activity in another > (isolated) network. Om the other hand, flows in the same network may > influence on each other. > > Igor > > > On Tuesday, April 28, 2020, 12:30:38 PM EDT, Greg Mirsky > <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> wrote: > > > Hi Jie, > thank you for listing the existing cases of isolation term use in > IETF RFCs. My understanding of these quotes is that most of them > refer to data flow isolation/separation. And that is what > Connectivity Verification OAM is intended to monitor. At the same > time, as Joel has pointed out, the term isolation is being used in > the draft-nsdt-teas-transport-slice-definition in a different > manner, particularly in Section 4.1.1. In that section, several > levels (hard and soft) of the isolation are discussed whereas > isolation of data flows, in my understanding, is always "hard". As > I've mentioned earlier, we might look for different terms when > referring to use/access to underlay resources vs. data flows > interaction. > > Regards, > Greg > > > On Tue, Apr 28, 2020 at 2:31 AM Dongjie (Jimmy) <jie.dong@huawei.com <mailto:jie.dong@huawei.com%0b>> <mailto:jie.dong@huawei.com>> wrote: > > Hi Joel and Greg, > > As I mentioned during the virtual meeting, isolation was > described as a requirement in several PPVPN requirement and > framework RFCs. In summary, isolation is firstly required to > avoid unwanted exposure of both data traffic and routing > information, then it is also mentioned that isolation is needed > to avoid the effects of traffic congestion happened in other > VPNs in the network. > > Just quote some of them: > > RFC 3809: Generic Requirements for Provider Provisioned Virtual > Private Networks (PPVPN) > > 4.4. Data isolation > > The PPVPN MUST support forwarding plane isolation. The > network MUST > never deliver user data across VPN boundaries unless the two > VPNs > participate in an intranet or extranet. > > Furthermore, if the provider network receives signaling or > routing > information from one VPN, it MUST NOT reveal that information to > another VPN unless the two VPNs participate in an intranet or > extranet. > > > RFC 4031: Service Requirements for Layer 3 Provider Provisioned > Virtual Private Networks (PPVPNs) > > 4.1. Isolated Exchange of Data and Routing Information > > A mechanism must be provided for isolating the distribution of > reachability information to only those sites associated with > a VPN. > ... > Note that isolation of forwarded data or exchange of > reachability > information to only those sites that are part of a VPN may > be viewed > as a form of security - for example, [Y.1311.1], [MPLSSEC]. > > 5.8. Isolation > > These features include traffic and routing information exchange > isolation, similar to that obtained in VPNs based on Layer 1 and > Layer 2 (e.g., private lines, FR, or ATM) [MPLSSEC]. > > 6.8. Isolation of Traffic and Routing > ... > From a high-level SP perspective, a PE-based L3VPN MUST > isolate the > exchange of traffic and routing information to only those > sites that > are authenticated and authorized members of a VPN. > > In a CE-based VPN, the tunnels that connect the sites > effectively > meet this isolation requirement if both traffic and routing > information flow over the tunnels. > > An L3VPN solution SHOULD provide a means to meet L3VPN QoS SLA > requirements that isolates VPN traffic from the effects of > traffic > offered by non-VPN customers. Also, L3VPN solutions SHOULD > provide a > means to isolate the effects that traffic congestion produced by > sites as part of one VPN can have on another VPN. > > > RFC 4110: A Framework for Layer 3 Provider-Provisioned Virtual > Private Networks (PPVPNs) > > 1.2 Overview of Virtual Private Networks > > In PE-based layer 3 VPNs, the PE devices may > route the VPN traffic based on the customer addresses found > in the IP > headers; this implies that the PE devices need to maintain a > level of > isolation between the packets from different customer networks.. > ... > Tunneling is also important for other reasons, such as providing > isolation between different customer networks, allowing a > wide range > of protocols to be carried over an SP network, etc. > Different QoS > and security characteristics may be associated with different > tunnels. > > 4. 3 VPN Tunneling > > Another capability optionally provided by tunneling is that of > isolation between different VPN traffic flows. The QoS and > security > requirements for these traffic flows may differ, and can be > met by > using different tunnels with the appropriate > characteristics. This > allows a provider to offer different service characteristics for > traffic in different VPNs, or to subsets of traffic flows > within a > single VPN. > > > Hope this helps. > > Best regards, > Jie > > > -----Original Message----- > > From: Teas [mailto:teas-bounces@ietf.org > <mailto:teas-bounces@ietf.org>] On Behalf Of Joel M. Halpern > > Sent: Tuesday, April 28, 2020 5:33 AM > > To: Greg Mirsky <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com%0b>> <mailto:gregimirsky@gmail.com>> > > Cc: teas@ietf.org<mailto:teas@ietf.org> <mailto:teas@ietf.org> > > Subject: Re: [Teas] Network Slicing design team definitions - > isolation and > > resolution > > > > Greg, that definition seems to be a specific subset of VPN. > > As far as I can tell, the slice definition does include what > endpoints the slice > > participants can talk to. Presumably, with some way to say > "the Internet". > > So Whether the slice supports communication with the Internet > or not is > > definitely an observable property. I would tend not to call > it isolation. > > Separately, the definition you propose is unrelated to the > definition in the > > document, Which is why I suggest, for now, removing all > discussion of > > isolation from the document. > > > > Yours, > > Joel > > > > On 4/27/2020 5:22 PM, Greg Mirsky wrote: > > > Dear Joel, > > > thank you for bringing the matter of "isolation" to the > discussion. I > > > agree, that it is not practical to expect physical > isolation in modern > > > networks. In my view, a transport slice that requires > isolation is as > > > a transport connection that expects to receive data only > from the > > > specific domain and not from any other domain. In other > words, I view > > > isolation as the absence of mis-connectivity (in transport > network > > > interpretation which differentiates between path continuity > check and > > > connectivity verification). If my interpretation is > acceptable, then > > > isolation can be monitored using connectivity verification OAM > > mechanism(s). > > > I much appreciate your thoughts, opinion on the proposed > > > interpretation of isolation on transport slice. > > > > > > Regards, > > > Greg > > > > > > On Sun, Apr 26, 2020 at 8:57 AM Joel Halpern Direct > > > <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern.com%0b>> <mailto:jmh.direct@joelhalpern.com> > <mailto:jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalpern.com%0b>> <mailto:jmh.direct@joelhalpern.com>>> > > wrote: > > > > > > Trimmed, in line. > > > Joel > > > > > > On 4/26/2020 11:08 AM, Dongjie (Jimmy) wrote: > > > > Hi Joel, > > > > > > > > Please see some replies inline: > > > > > > > >> -----Original Message----- > > > >> From: Teas [mailto:teas-bounces@ietf.org > <mailto:teas-bounces@ietf.org> > > > <mailto:teas-bounces@ietf.org > <mailto:teas-bounces@ietf..org>>] On Behalf Of Joel M. Halpern > > > >> Sent: Sunday, April 26, 2020 10:52 AM > > > >> To: Zhenghaomian <zhenghaomian@huawei.com <mailto:zhenghaomian@huawei.com%0b>> <mailto:zhenghaomian@huawei.com> > > > <mailto:zhenghaomian@huawei.com <mailto:zhenghaomian@huawei.com%0b>> <mailto:zhenghaomian@huawei.com>>>; teas@ietf.org<mailto:teas@ietf.org> > <mailto:teas@ietf.org> > > <mailto:teas@ietf.org <mailto:teas@ietf.org>> > > > >> Subject: Re: [Teas] Network Slicing design team > definitions - > > > isolation and > > > >> resolution > > > >> > > > .... > > > >> More importantly, it is not something the customer > has any way > > > to verify. > > > >> There is no test a customer can run that will > verify this. > > > >> Making unverifiable promises is rarely a useful > thing to do. > > > > > > > > Totally agree that tools for verification is > important. As > > > mentioned in Haomian's mail, isolation can be verified > with suitable > > > tools which can be used to collect the information at > the necessary > > > places with a suitable interval. And it is important > that customers > > > can be provided with such tools to monitor the > performance and be > > > informed of SLA violation. > > > > > > As far as I can tell, the observable that you describe > is latency > > > variation (or maybe loss). Fine, describe the SLO in > terms of latency > > > variation (or loss). Given that there are always > imperfections in > > the > > > system, the customer may think that the issue is > isolation. But > > > what he > > > can observe, and as far as I can tell what he cares > about, is delay > > > variation, loss, or other factors that affect his traffic. > > > > > > To use a different example, I have learned from the > advocates to hate > > > bufferbloat. But even their tests measure delay, delay > variation, > > > etc.. > > > They then infer the presence of large buffers. But in > fact, if the > > > large buffers are present but never used, we would all > be happy. So > > > the > > > SLO on this would be in terms of latency, latency > variation, loss, etc. > > > Not bufferbloat.` > > > > > > Yours, > > > Joel > > > > > > > > > > > Best regards, > > > > Jie > > > > > > > >> > > > >> Yours, > > > >> Joel > > > >> > > > >> PS: Note that I understand that operators get asked > for odd > > > things mby > > > >> customers. But if we are going to define standards > to support > > > it, we need to > > > >> understand the actual need. > > > >> > > > >> On 4/25/2020 10:44 PM, Zhenghaomian wrote: > > > >>> Not sure if I understand your question correctly.. > > > >>> Well, it's reasonable for people to request hard > isolation > > > because 'I don't want > > > >> my data to be transported together with other > people's data'. > > > >>> For delivery this can be achieved by separating > physical > > > devices/connections, > > > >> which are visible to users. For example dedicated > boxes and > > > fibers will guarantee > > > >> the user's data is not mixed with others... > > > >>> > > > >>> Best wishes, > > > >>> Haomian > > > >>> > > > >>> -----邮件原件----- > > > >>> 发件人: Joel M. Halpern > [mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> > > > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>] > > > >>> 发送时间: 2020年4月26日 10:34 > > > >>> 收件人: Zhenghaomian <zhenghaomian@huawei.com <mailto:zhenghaomian@huawei.com%0b>> <mailto:zhenghaomian@huawei.com> > > > <mailto:zhenghaomian@huawei.com <mailto:zhenghaomian@huawei.com%0b>> <mailto:zhenghaomian@huawei.com>>>; teas@ietf.org<mailto:teas@ietf.org> > <mailto:teas@ietf.org> > > <mailto:teas@ietf.org <mailto:teas@ietf.org>> > > > >>> 主题: Re: [Teas] Network Slicing design team > definitions - > > > isolation and > > > >>> resolution > > > >>> > > > >>> (trimmed) > > > >>> What is the user perceivable effect that the user > is asking for > > > when you say "if > > > >> the user requests isolation"? > > > >>> > > > >>> Yours, > > > >>> Joel > > > >>> > > > >>> On 4/25/2020 10:31 PM, Zhenghaomian wrote: > > > >>>> Hi, Kiran, Joel, > > > >>>> > > > >>> ... > > > >>>> BTW, regarding the isolation, I don't see the > necessity to > > > argue whether it > > > >> should be in SLO or not. The isolation itself, can > either be > > > requested by the user > > > >> of the transport slice (then from NBI of TSC) to > express the > > > demand of reliability, > > > >> or be offered by the provider of the transport > slice (then from > > > the SBI of TSC) to > > > >> achieve the SLO requested from the user. In other > words, if the > > > user requests > > > >> certain level of isolation in an SLO, such > isolation should be > > > provided; if the user > > > >> does not request certain level of isolation (no > isolation > > > request in SLO), then > > > >> there may be some isolation provided to satisfy the > user's > > request. > > > >>>> > > > >>>> Best wishes, > > > >>>> Haomian > > > >> > > > >> _______________________________________________ > > > >> Teas mailing list > > > >> Teas@ietf.org<mailto:Teas@ietf.org> <mailto:Teas@ietf.org> > <mailto:Teas@ietf.org <mailto:Teas@ietf.org>> > > > >> 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- [Teas] Network Slicing design team definitions - … Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Kiran Makhijani
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Zhenghaomian
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Zhenghaomian
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- [Teas] 答复: Network Slicing design team definition… Zhenghaomian
- Re: [Teas] Network Slicing design team definition… Luis M. Contreras
- Re: [Teas] Network Slicing design team definition… Luis M. Contreras
- Re: [Teas] Network Slicing design team definition… Dongjie (Jimmy)
- Re: [Teas] Network Slicing design team definition… Joel Halpern Direct
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… LUIS MIGUEL CONTRERAS MURILLO
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… LUIS MIGUEL CONTRERAS MURILLO
- Re: [Teas] Network Slicing design team definition… Kiran Makhijani
- Re: [Teas] Network Slicing design team definition… Greg Mirsky
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Dongjie (Jimmy)
- Re: [Teas] Network Slicing design team definition… Joel Halpern Direct
- Re: [Teas] Network Slicing design team definition… Dongjie (Jimmy)
- Re: [Teas] Network Slicing design team definition… Greg Mirsky
- Re: [Teas] Network Slicing design team definition… Greg Mirsky
- Re: [Teas] Network Slicing design team definition… Igor Bryskin
- Re: [Teas] Network Slicing design team definition… Zhenghaomian
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… John E Drake
- Re: [Teas] Network Slicing design team definition… Dongjie (Jimmy)
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Dongjie (Jimmy)
- Re: [Teas] Network Slicing design team definition… David Sinicrope
- Re: [Teas] Network Slicing design team definition… Greg Mirsky
- Re: [Teas] Network Slicing design team definition… Zhenghaomian
- Re: [Teas] Network Slicing design team definition… Greg Mirsky
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… Kiran Makhijani
- Re: [Teas] Network Slicing design team definition… Daniele Ceccarelli
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern
- Re: [Teas] Network Slicing design team definition… John E Drake
- Re: [Teas] Network Slicing design team definition… Igor Bryskin
- Re: [Teas] Network Slicing design team definition… Jari Arkko
- Re: [Teas] Network Slicing design team definition… Joel M. Halpern