Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming

[Muthu Arul Mozhi Perumal <[e-mail]>]

Hi Satya,

draft-ietf-bess-evpn-df-election-framework also does not describe how the
BDF is to be calculated for the default DF election algo. Am I missing
something?

I think my question still holds:
Though it is straightforward to calculate the BDF by eliminating the DF
from the candidate list, would an implementation calculating the BDF that
way for the default DF election algo interoperate without any problem?

Would it be better to update draft-ietf-bess-evpn-df-election-framework on
how the BDF is to be calculated in general for any DF election algo
(including the default DF election algo)?

Regards,
Muthu

On Sat, Mar 23, 2019 at 2:46 AM Satya Mohanty (satyamoh) <[e-mail]>
wrote:

> Hi Muthu,
>
>
>
> Yes, the BDF is as per what you have mentioned.
>
> https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09
> formally defines it.
>
>
>
> Thanks,
>
> --Satya
>
>
>
> *From: *BESS <[e-mail]> on behalf of Muthu Arul Mozhi
> Perumal <[e-mail]>
> *Date: *Friday, March 22, 2019 at 11:41 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <[e-mail]
> >
> *Cc: *"[e-mail]" <[e-mail]>
> *Subject: *Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming
>
>
>
> Thanks, Jorge. Need another clarification. RFC 7432 does not describe how
> to calculate the BDF for the default DF algo. Though it is
> straightforward to calculate the BDF by eliminating the DF from the
> candidate list, would an implementation calculating the BDF that way for
> the default DF algo interoperate without any problem?
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Fri, Mar 22, 2019 at 11:45 PM Rabadan, Jorge (Nokia - US/Mountain View)
> <[e-mail]> wrote:
>
> Hi,
>
>
>
> Well, everyone has to support the default DF Alg, based on RFC7432. So
> that one for sure. And in addition there are others that have been
> implemented. For instance, Pref DF election has been implemented by
> multiple vendors.
>
> Thanks,
>
> Jorge
>
>
> ------------------------------
>
> *From:* Muthu Arul Mozhi Perumal <[e-mail]>
> *Sent:* Friday, March 22, 2019 10:41
> *To:* Rabadan, Jorge (Nokia - US/Mountain View)
> *Cc:* [e-mail]
> *Subject:* Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming
>
>
>
> Hi Jorge,
>
>
>
> I didn't mean using different algorithms for electing the DF and BFD. I am
> just asking which algorithm is most widely implemented/used for electing
> the DF *and* BDF for EVPN VPWS single-active multihoming.
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Fri, Mar 22, 2019 at 7:47 PM Rabadan, Jorge (Nokia - US/Mountain View) <
> [e-mail]> wrote:
>
> The implementations I know use the same DF Alg for DF election _*and*_
> backup DF Election. And I don’t see why you would use something different?
>
> In other words, if you use e.g., Pref based DF Alg, use it for DF and BDF
> elections. Only that the BDF election excludes the DF from the candidate
> list.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From:*BESS <[e-mail]> on behalf of Muthu Arul Mozhi Perumal
> <[e-mail]>
> *Date: *Friday, March 22, 2019 at 4:23 AM
> *To: *"[e-mail]" <[e-mail]>
> *Subject: *[bess] BDF Election in EVPN VPWS Single-Active Multihoming
>
>
>
> While RFC 8214 doesn't recommend any DF election algorithm capable of
> electing the BDF in EVPN VPWS single-active multihoming for deciding the
> backup PE, any feedback on what is(are) the widely implemented/supported DF
> election  algorithm(s) by vendors?
>
>
>
> Regards,
>
> Muthu
>
>