Re: [bess] Suresh Krishnan's No Objection on draft-ietf-bess-evpn-vpls-seamless-integ-05: (with COMMENT)

"Ali Sajassi (sajassi)" <sajassi@cisco.com> Tue, 22 January 2019 09:20 UTC

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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: Suresh Krishnan <suresh@kaloom.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-evpn-vpls-seamless-integ@ietf.org" <draft-ietf-bess-evpn-vpls-seamless-integ@ietf.org>, Matthew Bocci <matthew.bocci@nokia.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Suresh Krishnan's No Objection on draft-ietf-bess-evpn-vpls-seamless-integ-05: (with COMMENT)
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Date: Tue, 22 Jan 2019 09:20:43 +0000
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Subject: Re: [bess] Suresh Krishnan's No Objection on draft-ietf-bess-evpn-vpls-seamless-integ-05: (with COMMENT)
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Suresh,
Thanks for your review and your comments. Please refer to my replies below marked with "AS>".

On 1/9/19, 8:03 PM, "Suresh Krishnan" <suresh@kaloom.com> wrote:

    Suresh Krishnan has entered the following ballot position for
    draft-ietf-bess-evpn-vpls-seamless-integ-05: No Objection
    
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    ----------------------------------------------------------------------
    COMMENT:
    ----------------------------------------------------------------------
    
    * Section 3.3 MAC Mobility
    
    The handling of MAC mobility between the EVPN and VPLS PEs seems a bit, for a
    lack of a better term, "not seamless" to me. While only using EVPN a MAC that
    has moved will get propagated out without *initiating* any sort of BUM traffic
    itself as described Section 15 of RFC7432. If I understand this document
    correctly, if a MAC moves onto a segment with a VPLS PE, traffic towards it
    will be blackholed until it initiates BUM traffic which is not the case when
    the MAC moves between EVPN PEs. Did I get this right? If so, I think this
    limitation needs to be highlighted a bit more prominently.
    
  AS>  Section 3.3 describes two MAC move scenarios: move from EVPN PE to VPLS PE (1st para) and move from VPLS PE to EVPN PE (2nd para). In the first scenario, it says that if the moved MAC address doesn't initiate any BUM traffic (it only initiates known unicast traffic), then there can be black-holing for both EVPN and VPLS PEs. However, for the 2nd scenario, the black-holing can happen only for VPLS PEs. To clarify this point further, I added a sentence to each of the paragraph. 
1st para: Such black-holing happens for traffic destined to the moved C-MAC from both EVPN and VPLS PEs.
2nd para: Such black-holing happens for traffic destined to the moved C-MAC for only VPLS PEs but not for EVPN PEs.

Cheers,
Ali