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Re: [bess] Section 8.5 of draft-ietf-bess-rfc7432bis

"Jorge Rabadan (Nokia)" <jorge.rabadan@nokia.com> Fri, 10 February 2023 19:01 UTC

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From: "Jorge Rabadan (Nokia)" <jorge.rabadan@nokia.com>
To: Menachem Dodge <mdodge@drivenets.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Section 8.5 of draft-ietf-bess-rfc7432bis
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/Pe411s2RZneJMg8wasZOViBw--o>
Subject: Re: [bess] Section 8.5 of draft-ietf-bess-rfc7432bis
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Hi Menachem,

The way I see it, draft-ietf-bess-rfc7432bis will obsolete RFC7432, but it does not update or change RFC8584, so I don’t think draft-ietf-bess-rfc7432bis needs to repeat the aspects of RFC8584.

In particular, the AC-DF, as the other capabilities defined in other documents, is a capability that can be turned on or off. While it is very useful in many cases, it actually needs to be disabled in some others, e.g., draft-ietf-bess-evpn-mh-pa-07<https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-mh-pa-07>

So the answer to your second question could be that the AC-DF capability should be configurable in the implementation, and used on all cases where issues with individual Attachment Circuits may create blackholes. However, it has to be disabled in case of port-active multi-homing.

My 2 cents..

Thanks.
Jorge


From: BESS <bess-bounces@ietf.org> on behalf of Menachem Dodge <mdodge@drivenets.com>
Date: Friday, February 10, 2023 at 8:10 AM
To: bess@ietf.org <bess@ietf.org>
Subject: [bess] Section 8.5 of draft-ietf-bess-rfc7432bis
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Hello All,

In section 8.5 of draft-ietf-bess-rfc7432bis there is a reference to the Finite State Machine in section 2.1 of RFC 8584.

However, in section 4 of RFC 8584 the AC Influenced DF Election Capability is described and it states that this updates Step 3 of the procedure for service carving of RFC 7432.

Shouldn’t this AC-DF update be mentioned in the procedures of section 8.5 of draft-ietf-bess-rfc7432bis?

Is AC Influenced DF Election the preferred DF election method ?


According to RFC 8584 “ The procedure discussed in this section is applicable to the DF

   election in EVPN services [RFC7432<https://datatracker.ietf.org/doc/html/rfc7432>] and EVPN VPWS [RFC8214<https://datatracker.ietf.org/doc/html/rfc8214>]. “



Thank you kindly.

Best Regards,

Menachem Dodge​​​​
System Architect
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