Re: PBB E-VPN and TRILL

[Donald Eastlake <[e-mail]>]

Hi Sam,

On Thu, May 10, 2012 at 2:18 PM, Sam Aldrin <[e-mail]> wrote:
> Donald,
>

> At the WG session it was asked whether interconnecting TRILL was in TRILL charter of not. The answer was no. So, will the charter be edited to reflect what you are eluding to below?

I don't believe there is a charter change currently in the works. I
believe the question was more like "interconnecting TRILL islands". I
interpreted this to be the sort of limited interconnection, which
allows the islands to continue as separate islands, that is in the
current L2VPN draft.

Thanks,
Donald
=============================
 Donald E. Eastlake 3rd   [phone] (cell)
 155 Beaver Street, Milford, MA 01757 USA
 [e-mail]

> Sam
>
> Sent from my iPhone
>
> On May 10, 2012, at 10:56 AM, Donald Eastlake <[e-mail]> wrote:
>
>> On Thu, May 10, 2012 at 10:35 AM, Lucy yong <[e-mail]> wrote:
>>> There is another draft to be considered.
>>>
>>> http://tools.ietf.org/html/draft-yong-trill-trill-o-mpls-01.txt
>>
>> There are a number of drafts but I think it is useful to make a
>> distinction between drafts that provide full connectivity between
>> TRILL switches (RBridges), so that they merge into a single TRILL
>> campus, and drafts that provide for data plane connectivity but
>> limited control plane connectivity for fault isolation, etc.
>>
>> TRILL switches are routers. Like IP routers they logically strip the
>> link envelope from TRILL frames they receive and add a new, possible
>> different technology, link envelope on TRILL frames they send. Just as
>> it is possible to have an IP routed region where none of the
>> connections between IP routers is Ethernet but could be, for example,
>> PPP, it is possible to have a TRILL campus where none of the
>> connections between the RBridges is Ethernet but they are all some
>> other technology X, such as PPP. So, drafts that are "TRILL over X"
>> that are talking about full TRILL data and control plan connectivity
>> don't really seem to me to have much to do with L2VPN. Such drafts
>> should be done in either the TRILL WG or in the WG that does
>> technology X.
>>
>> It seems to me that L2VPN has to do with method that provide limited
>> data plane interconnection for better fault isolation.
>>
>> Thanks,
>> Donald
>> =============================
>>  Donald E. Eastlake 3rd   [phone] (cell)
>>  155 Beaver Street, Milford, MA 01757 USA
>>  [e-mail]
>>
>>> Lucy
>>>
>>> -----Original Message-----
>>> From: [e-mail] [mailto:[e-mail]] On Behalf Of Balaji Venkat Venkataswami
>>> Sent: Thursday, May 10, 2012 2:34 AM
>>> To: [e-mail]; [e-mail]
>>> Cc: [e-mail]; [e-mail]
>>> Subject: PBB E-VPN and TRILL
>>>
>>> Hi  Giles,
>>>
>>> I totally agree on this point. We have a solution that was presented to the TRILL
>>> working group as well on the interconnection of TRILL islands. We would like to
>>> concur with this and request for entering our draft as well into the solution space.
>>>
>>> The URL for the TRILL draft is as follows.
>>> http://tools.ietf.org/html/draft-balaji-trill-over-ip-multi-level-05
>>>
>>>
>>> thanks and regards,
>>> balaji venkat
>>>
>>> Sent: Wednesday, May 09, 2012 6:04 PM
>>> To: [e-mail]
>>> Cc: Ali Sajassi (sajassi); Stewart Bryant
>>> Subject: PBB E-VPN and TRILL
>>>
>>> Ali presented the PBB-EVPN draft at IETF83 in Paris:
>>>
>>> http://tools.ietf.org/html/draft-ietf-l2vpn-pbb-evpn-01
>>>
>>> This has since been updated:
>>>
>>> http://tools.ietf.org/html/draft-ietf-l2vpn-pbb-evpn-02
>>>
>>> During our discussions Ali mentioned that the authors would like the TRILL section of the draft to be separated out into a separate draft.  In response Stewart questioned whether interconnecting TRILL islands is in-scope for L2VPN.
>>>
>>> Stewart, Nabil and I have just been discussing these issues.  Whilst TRILL interconnect is not explicitly in-charter for L2VPN it would appear to be implicitly in-charter - our decision to standardise solutions for PBB VPLS and PBB E-VPN probably sets a precedent (since PBB is also unmentioned by the charter).
>>>
>>> On this basis we would like to ask the WG the following three questions:
>>>
>>> 1) is the WG happy for us to pursue interconnection of TRILL islands over L2VPN?
>>>
>>> 2) is the WG happy for the authors to split the TRILL section of the PBB E-VPN draft into a separate draft?
>>>
>>> 3) is the WG happy for the TRILL draft to be a WG doc?
>>>
>>> Please respond by May 22nd if you are unhappy with any of these 3 actions (I'll take no response to mean the WG is in agreement with us proceeding...)
>>>
>>> Giles
>>>
>>>