Re: [lisp] [ipwave] I-D Action: draft-barkai-lisp-nexagon-10.txt

Hi all,

Some of the history below is wrong, so I’d like to correct it (with no comment on LISP itself):

>> 1. Couple of decades ago a peer to peer layer2 protocol called DSRC was specified over WiFi spectrum with basic safety messages (BSM) in which cars conveyed their GPS and kinematics sensor events like hard-brake, sharp-turn. Additional payment and information messages were specified as well.

The V2X system specified by the DSRC/WAVE standards in IEEE and SAE covers the whole stack (not just layer 2) and supports both broadcast and unicast operations (it’s not inherently peer-to-peer, though some of the defined applications are peer-to-peer).

For example, in the US:
* Layers 1 and 2 are defined in 802.11p, now incorporated into the main 802.11 standard as 802.11 *O*utside the *C*ontext of a *B*asic Service Set (OCB)
* Supported transport and network layer protocols include WSMP, a single-hop protocol best suited to broadcast, TCP over IPv6 and IDP over IPv6. These are specified in IEEE 1609.3 and other IEEE 1609 standards
* Applications that use the system and messages that the applications use are defined in IEEE 1609.11 and (mainly) in SAE J2735 and the SAE J2945/x series of standards. The process of specifying applications is ongoing – the para above makes it seem like a set of applications was defined and then the specification process stopped.

(The situation in Europe is similar except that the lower layers above layer 2 are specified in ETSI and the higher layers are specified in CEN, with some overlap; there is also a series of standards from ISO TC 204 which address the same area).

>>2. For privacy considerations road-side-units (RSU) were specified as well to hand MAC keys to be used so cars will not be tracked. This double infrastructure presented a barrier so DSRC over cellular was specified CV2X. The 5G evolution is supposed to match the latency of peer to peer WiFi.

RSUs are not required to be actively involved in V2V safety.

Vehicles use certificates to sign messages, not MAC keys.

Anti-tracking is important, agreed! This is achieved by giving vehicles a large number of simultaneously valid certificates and allowing them to switch between them periodically.

There is no “double infrastructure”.

C-V2X uses the same security system as DSRC and was proposed not so much because of technical shortcomings with DSRC as because of a business model failure – DSRC hasn’t been deployed because of concerns that it wouldn’t be widespread enough to be effective and the hope is that C-V2X will have synergies with other communications hardware on the car that will lower the total cost of ownership (as well as providing a migration path to higher-capacity channels)

>> 3. The peer to peer challenges however remained, the need to test every product with every other product is a barrier for extending the protocol to support on vehicle vision and sensory annotations which evolved since - such as machine vision and liadr.

There is no need to test every product with every other product. OmniAir and ETSI run conformance test services that test conformance to the standards, and products that implement the standards in general interoperate. This is similar to how not every WiFi chip needs to be tested against every other WiFi chip; instead, each chip can be individually certified and give a high confidence of interoperability.

>> Also timing sequence for relaying annotations between vehicles remains a problem since both DSRC and CV2X have no memory and cars drive away.

Memory of “annotations” would be implemented higher up the stack – whether or not the layer 2 protocol maintains the information is immaterial. Some architectures (like the ETSI and ISO ITS Station) identify functional components within the devices that would maintain that state; some (like the IEEE WAVE device architecture) leave it as an implementation choice. I agree that the existing standards don’t fully address this issue, though.

Hope this corrects some misunderstandings.

Cheers,

William

From: its <its-bounces@ietf.org> On Behalf Of Ratliff, Stanley
Sent: Thursday, September 19, 2019 10:50 AM
To: Sharon Barkai <sharon.barkai@getnexar.com>; Victor Moreno (vimoreno) <vimoreno@cisco.com>
Cc: lisp@ietf.org; its@ietf.org
Subject: [EXT] Re: [ipwave] [lisp] I-D Action: draft-barkai-lisp-nexagon-10.txt

This looks like interesting work. But, don’t we already have a WG addressing vehicular networks? Has there been any collaboration with the ipwave WG? Just curious.

Regards,
Stan

From: lisp <lisp-bounces@ietf.org<mailto:lisp-bounces@ietf.org>> On Behalf Of Sharon Barkai
Sent: Thursday, September 19, 2019 1:30 AM
To: Victor Moreno (vimoreno) <vimoreno@cisco.com<mailto:vimoreno@cisco.com>>
Cc: lisp@ietf.org<mailto:lisp@ietf.org>
Subject: Re: [lisp] I-D Action: draft-barkai-lisp-nexagon-10.txt

***WARNING! THIS EMAIL ORIGINATES FROM OUTSIDE ST ENGINEERING IDIRECT.***

Thank you Victor.

Quick recap of mobility networks evolution:

1. Couple of decades ago a peer to peer layer2 protocol called DSRC was specified over WiFi spectrum with basic safety messages (BSM) in which cars conveyed their GPS and kinematics sensor events like hard-brake, sharp-turn.
Additional payment and information messages were specified as well.

2. For privacy considerations road-side-units (RSU) were specified as well to hand MAC keys to be used so cars will not be tracked. This double infrastructure presented a barrier so DSRC over cellular was specified CV2X.
The 5G evolution is supposed to match the latency of peer to peer WiFi.

3. The peer to peer challenges however remained, the need to test every product with every other product is a barrier for extending the protocol to support on vehicle vision and sensory annotations which evolved since - such as machine vision and liadr. Also timing sequence for relaying annotations between vehicles remains a problem since both DSRC and CV2X have no memory and cars drive away.

Addressable geo-states brokering solves timing, interoperability, and extendability limitations, and, edge-processing address latency needs => demonstrated in single-digit latencies in production environments, sub 5msecs in labs.

>From here selecting LISP as the layer3 protocol of choice the road is short and explained in the draft:

o The support for logical EIDs for states based on (de-facto) geo-spatial standard grids

o controlling latency and high availability by routing to states at the edge

o supporting ephemeral EIDs for vehicles

o signal-free-multicast for limited cast of many geo-spatial channels

o the distributed connectionless scale

o the multi-vendor interoperability that allows for “bring your own XTR” to protect geo-privacy

o the ability to overlay multiple cellular network providers and multiple cloud-edge providers

... are some of the features which make LISP a good choice for mobility VPNs.. Hope this helps.

--szb
Cell: +972.53.2470068
WhatsApp: +1.650.492.0794

> On Sep 19, 2019, at 7:01 AM, Victor Moreno (vimoreno) <vimoreno@cisco.com<mailto:vimoreno@cisco.com>> wrote:
>
> I think a thorough understanding of mobility requirements and dependencies and how LISP may or may not accommodate these scenarios is key. I would like to see us work on this and other mobility related drafts (e.g. Ground based LISP).
>
> Victor
>
>> On Sep 18, 2019, at 11:18 AM, Dino Farinacci <farinacci@gmail.com<mailto:farinacci@gmail.com>> wrote:
>>
>> I’m a side author on this document and more of a reviewer. But I’ll answer your questions on behalf of a WG member.
>>
>>> Before I get more privacy feedback (if I do) I want to know
>>> 1) does the WG actually care about this?
>>
>> I do. Because understanding in deep detail the use-cases, allows us to understand if LISP has the necessary protocol features.
>>
>>> 2) Is it ready for more extensive review?
>>
>> Yes.
>>
>>> I realize we have not adopted this document. Some of this feedback is to help the chairs judge what to do when the authors do ask for adoption.
>>
>> We are at a point of the protocol’s life where working on use-cases allows more adoption. I am for making this a working group document (even though the authors have not formally requested).
>>
>> Dino
>>
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