Re: [bess] WG Last Call on draft-ietf-bess-evpn-etree

"Ali Sajassi (sajassi)" <sajassi@cisco.com> Thu, 12 May 2016 05:30 UTC

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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: "thomas.morin@orange.com" <thomas.morin@orange.com>, "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>, BESS <bess@ietf.org>, "draft-ietf-bess-evpn-etree@tools.ietf.org" <draft-ietf-bess-evpn-etree@tools.ietf.org>
Thread-Topic: [bess] WG Last Call on draft-ietf-bess-evpn-etree
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Date: Thu, 12 May 2016 05:30:09 +0000
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Subject: Re: [bess] WG Last Call on draft-ietf-bess-evpn-etree
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Hi Thomas,

I just made the final edits to evpn-etree draft and published it as rev05.

Regards,
Ali

On 3/29/16, 2:49 AM, "thomas.morin@orange.com" <thomas.morin@orange.com>
wrote:

>Hi everyone,
>
>This WG Last Call is now closed and the document will move to the next
>steps toward publication.
>
>The modification mentioned below will be incorporated in next release.
>
>Best,
>
>-Thomas
>
>
>
>2016-03-15, Ali Sajassi (sajassi):
>>
>> Jeffrey,
>>
>>
>>
>> On 2/1/16, 2:41 PM, "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
>>wrote:
>>
>>> Ali,
>>>
>>> One more question about PBB-EVPN.
>>>
>>> For the regular EVPN, section 3.3.2 talks about a situation where the
>>> only traffic is BUM. There is no need for mac learning in that
>>>situation.
>>>
>>> For PBB-EVPN, I assume this is also possible. With this, there is no
>>>need
>>> to advertise per-ES B-mac addresses - a single pair of global root/leaf
>>> B-mac addresses are enough.
>>>
>>> Perhaps this can be mentioned for parity/completeness. Of course, this
>>>is
>>> not a big deal and either way it's fine - but I do want to ask to
>>>confirm
>>> my understanding.
>>
>> We’ll do.
>>
>> Cheers,
>> Ali
>>
>>>
>>> Jeffrey
>>>
>>>> -----Original Message-----
>>>> From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]
>>>> Sent: Monday, February 01, 2016 2:04 AM
>>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>et>; EXT -
>>>> thomas.morin@orange.com <thomas.morin@orange.com>om>; BESS
>>>><bess@ietf.org>;bess@ietf.org>;
>>>> draft-ietf-bess-evpn-etree@tools.ietf.org
>>>> Subject: Re: [bess] WG Last Call on draft-ietf-bess-evpn-etree
>>>>
>>>> Hi Jeffrey,
>>>>
>>>> Thanks for the review. Your comments helps tighten the draft some
>>>>more.
>>>> I
>>>> have updated the draft and will publish it next (rev04). Majority of
>>>>the
>>>> comments were editorial in nature for better clarifications. Since the
>>>> existing draft (rev03) reflects the consensus regarding our several
>>>> rounds
>>>> of discussions where we have taken care of the technical items, it is
>>>> consistent with our expectation of not seeing any major issue during
>>>>the
>>>> LC. Please refer to my replies in line.
>>>>
>>>> Cheers,
>>>> Ali
>>>>
>>>>
>>>> On 1/27/16, 5:26 PM, "BESS on behalf of Jeffrey (Zhaohui) Zhang"
>>>> <bess-bounces@ietf.org on behalf of zzhang@juniper.net> wrote:
>>>>
>>>>> I was involved in relevant discussions, and have reviewed once more
>>>>>for
>>>>> this LC.
>>>>>
>>>>> I support the publication, but with the following questions/comments.
>>>>>
>>>>> 2.1 Scenario 1: Leaf OR Root site(s) per PE
>>>>>
>>>>>    ... If the number of EVIs is very large
>>>>>    (e.g., more than 32K or 64K), then RT type 0 as defined in
>>>>>[RFC4360]
>>>>>    SHOULD be used; otherwise, RT type 2 is sufficient.
>>>>>
>>>>> RFC 7153 should be referenced for "Type 2".
>>>>
>>>>
>>>> Done.
>>>>
>>>>>
>>>>> Additionally, why is 32K mentioned? I can understand the 64k part.
>>>>
>>>> Removed 32K since the example is clear enough with 64K
>>>>
>>>>>
>>>>>    ... the MPLS-encapsulated frames MUST be tagged with an
>>>>>    indication of whether they originated from a Leaf AC or not.
>>>>>
>>>>> Perhaps change the last line to "indication if they originated from a
>>>>> Leaf AC"? Packets from a root AC are not tagged with a leaf
>>>>>indication.
>>>>
>>>> OK. Better yet. It should say ³indication when they originated from a
>>>> leaf
>>>> AC².
>>>>
>>>>>
>>>>>    Other mechanisms for identifying whether an egress AC is a root or
>>>>>    leaf is beyond the scope of this document.
>>>>>
>>>>> Should "egress" be "ingress" in the above paragraph? Or simply
>>>>>removed?
>>>>
>>>> Nice catch! It is ³ingress². It is now corrected.
>>>>
>>>>>
>>>>>    ... This Leaf MPLS label is advertised to other PE devices,
>>>>>    using a new EVPN Extended Community called E-TREE Extended
>>>>>Community
>>>>>    (section 5.1) along with an Ethernet A-D per ES route with ESI of
>>>>>    zero and a set of Route Targets (RTs) corresponding to all the
>>>>>leaf
>>>>>    ACs on the PE.
>>>>>
>>>>> Perhaps change the last sentence to "... corresponding to all EVIs
>>>>>that
>>>>> have leaf sites on the PE."
>>>>
>>>> The second to last sentence of section 3.2.1 says the same thing. I
>>>> changed this sentence and removed the 2nd to last sentence.
>>>>
>>>>>
>>>>> 3.2.3 BUM traffic originated from a multi-homed site on a leaf AC
>>>>>
>>>>>    In this scenario, it is assumed that a multi-homed Ethernet
>>>>>Segment
>>>>>    (ES) can have a mixed of both leaf and root ACs with each AC
>>>>>    designating a subnet (e.g., a VLAN).
>>>>>
>>>>> I understand that different VLANs on the same ES could be roots or
>>>>> leaves. I suppose it's more important to say that for the same vlan,
>>>>> different PEs on the same ES must have the same root/leaf
>>>>>designation.
>>>>
>>>> That¹s given.
>>>>
>>>>>
>>>>> Perhaps the first sentence could be reworded as the following to
>>>> capture
>>>>> the above point:
>>>>>
>>>>>    While different ACs (VLANs) on the same ES could have different
>>>>>    root/leaf designation (some being roots and some being leaves),
>>>>>    the same VLAN does have the same root/leaf designation on all
>>>>>    PEs on the same ES.
>>>>
>>>> That¹s fine. It makes it more clear.
>>>>
>>>>>
>>>>> For the following:
>>>>>
>>>>>    ... the PEs with Leaf sites perform MAC learning in the
>>>>>    data-path over their Ethernet Segments, and advertise reachability
>>>> in
>>>>>    EVPN MAC Advertisement routes which are imported only by PEs with
>>>>>at
>>>>>    least one Root site in the EVI. A PE with only Leaf sites will not
>>>>>    import these routes. PEs with Root and/or Leaf sites may use the
>>>>>    Ethernet A-D routes for aliasing (in the case of multi-homed
>>>>>    segments) and for mass MAC withdrawal per [RFC 7432].
>>>>>
>>>>> The above seems to contradict with the recommendation in Section 2.2.
>>>> If
>>>>> the context is the scenario described in section 2.1 then that's
>>>>>fine,
>>>>> but the text does not have a clear context.
>>>>
>>>> Agreed. Updated the section to indicate the context is section 2.1.
>>>>
>>>>>
>>>>>
>>>>> 3.3.2 E-Tree without MAC Learning
>>>>>
>>>>>    The PEs implementing an E-Tree service need not perform MAC
>>>>>learning
>>>>>    when the traffic flows between Root and Leaf sites are multicast
>>>>>or
>>>>>    broadcast.
>>>>>
>>>>> I suppose an "only" word should be added at the end of the above
>>>> sentence.
>>>>
>>>> Agreed.
>>>>
>>>>>
>>>>>
>>>>>    The fields of the IMET route are populated per the procedures
>>>> defined
>>>>>    in [RFC7432], and the route import rules are as described in
>>>> previous
>>>>>    sections.
>>>>>
>>>>> The route import rules described in previous sections are for MAC
>>>> routes,
>>>>> not IMET routes. Additionally, those rules may not be recommended, so
>>>>> might as well delete the last sentence.
>>>>
>>>> Changed the last sentence to ³Š, and the multicast tunnel setup
>>>>criteria
>>>> are as described in the previous section.²
>>>>
>>>>>
>>>>> Section 3.3.1 talks about BUM procedures. That is not specific to
>>>>>3.3.1
>>>>> though. Perhaps extract that out to a separate section, and remove
>>>>>the
>>>>> BUM text from 3.3.2 as well.
>>>>
>>>> I think it is OK.
>>>>
>>>>>
>>>>>    The E-TREE Extended Community is encoded as an 8-octet value as
>>>>>    follows:
>>>>>
>>>>>
>>>>>         0                   1                   2                   3
>>>>>         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
>>>>>0 1
>>>>>
>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>        | Type=0x06     | Sub-Type=0x04 | Flags(1 Octet)|
>>>> |
>>>>>
>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>        |  Reserved=0   |           Leaf Label
>>>> |
>>>>>
>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>
>>>>> I assume the octect after the flags octet is also reserved=0. Better
>>>> mark
>>>>> it as "Reserved=0".
>>>>
>>>> Agreed.
>>>>
>>>>>
>>>>> When it is used with Ethernet A-D per ES route, the leaf flag SHOULD
>>>>>be
>>>>> set to 0 but ignored by the receiving routers. Therefore, why not set
>>>> it
>>>>> to 1 to be consistent the MAC/IP route case?
>>>>
>>>> Because the flag is used for known unicast traffic and Leaf label for
>>>> BUM
>>>> traffic. We don¹t want to mix the two.
>>>>
>>>> Cheers,
>>>> Ali
>>>>
>>>>>
>>>>> Thanks.
>>>>> Jeffrey
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Thomas Morin
>>>>>> Sent: Tuesday, January 19, 2016 3:51 AM
>>>>>> To: BESS <bess@ietf.org>rg>; draft-ietf-bess-evpn-etree@tools.ietf.org
>>>>>> Subject: [bess] WG Last Call on draft-ietf-bess-evpn-etree
>>>>>>
>>>>>> Hello Working Group,
>>>>>>
>>>>>> This email starts a Working Group Last Call on
>>>>>> draft-ietf-bess-evpn-etree [1] which is considered mature and ready
>>>> for
>>>>>> a final working group review.
>>>>>>
>>>>>> Please read the document if you haven't read the most recent version
>>>> yet
>>>>>> (-03), and send your comments to the list, no later than *February
>>>> the
>>>>>> 2nd* (2016-02-02).
>>>>>>
>>>>>> This is not only a call for comments on the document, but also a
>>>>>>call
>>>> of
>>>>>> support for its publication.
>>>>>>
>>>>>> *Coincidentally*, we are also polling for knowledge of any IPR that
>>>>>> applies to draft-ietf-bess-evpn-etree, to ensure that IPR has been
>>>>>> disclosed in compliance with IETF IPR rules (see RFCs 3979, 4879,
>>>> 3669
>>>>>> and 5378 for more details).
>>>>>>
>>>>>> *If* you are listed as a document author or contributor of
>>>>>> draft-ietf-bess-evpn-etree please respond to this email and indicate
>>>>>> whether or not you are aware of any relevant IPR.
>>>>>>
>>>>>> Thank you,
>>>>>>
>>>>>> Thomas/Martin
>>>>>>
>>>>>> [1] https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-etree
>>>>>>
>>>>>> _______________________________________________
>>>>>> BESS mailing list
>>>>>> BESS@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/bess
>>>>>
>>>>> _______________________________________________
>>>>> BESS mailing list
>>>>> BESS@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/bess
>>>
>>
>
>
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