Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming
Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> Thu, 28 March 2019 11:43 UTC
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Thu, 28 Mar 2019 17:13:30 +0530
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To: "Satya Mohanty (satyamoh)" <satyamoh@cisco.com>
Cc: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "bess@ietf.org" <bess@ietf.org>
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Subject: Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming
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Hi Satya, Thanks for your response.. I see no harm in stating explicitly how the BDF is to be calculated for the default DF election algorithm. I however agree that it can't be generalized for all future DF election algorithms, so it is better described on a per algorithm basis.. Regards, Muthu On Thu, Mar 28, 2019 at 12:17 AM Satya Mohanty (satyamoh) < satyamoh@cisco.com> wrote: > Hi Muthu, > > > > As you mentioned it is straightforward to calculate the BDF in the default > DF Algorithm by taking the current DF out of reckoning. > > It is my personal view that since this is self-evident it need not be > explicitly stated. > > But I will let others decide. > > > > > > Thanks, > > --Satya > > > > *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> > *Date: *Monday, March 25, 2019 at 8:22 AM > *To: *"Satya Mohanty (satyamoh)" <satyamoh@cisco.com> > *Cc: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, > "bess@ietf.org" <bess@ietf.org> > *Subject: *Re: [bess] BDF Election in EVPN VPWS Single-Active Multihoming > > > > 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)? > > [Satya] IMHO opinion, much as it appears obvious, we cannot say for > certain that in every future DF algorithm (that may come into existence), > the BDF computation will always be as simple as taking the current DF (PE) > out of reckoning and doing the recomputation. > > > > Regards, > > Muthu > > > > Best, > > --Satya > > > > On Sat, Mar 23, 2019 at 2:46 AM Satya Mohanty (satyamoh) < > satyamoh@cisco.com> 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 <bess-bounces@ietf.org> on behalf of Muthu Arul Mozhi > Perumal <muthu.arul@gmail.com> > *Date: *Friday, March 22, 2019 at 11:41 AM > *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com > > > *Cc: *"bess@ietf.org" <bess@ietf.org> > *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) > <jorge.rabadan@nokia.com> 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 <muthu.arul@gmail.com> > *Sent:* Friday, March 22, 2019 10:41 > *To:* Rabadan, Jorge (Nokia - US/Mountain View) > *Cc:* bess@ietf.org > *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) < > jorge.rabadan@nokia.com> 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 <bess-bounces@ietf.org> on behalf of Muthu Arul Mozhi Perumal > <muthu.arul@gmail.com> > *Date: *Friday, March 22, 2019 at 4:23 AM > *To: *"bess@ietf.org" <bess@ietf.org> > *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 > >
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Muthu Arul Mozhi Perumal
- [bess] BDF Election in EVPN VPWS Single-Active Mu… Muthu Arul Mozhi Perumal
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Rabadan, Jorge (Nokia - US/Mountain View)
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Muthu Arul Mozhi Perumal
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Rabadan, Jorge (Nokia - US/Mountain View)
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Muthu Arul Mozhi Perumal
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Satya Mohanty (satyamoh)
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Muthu Arul Mozhi Perumal
- Re: [bess] BDF Election in EVPN VPWS Single-Activ… Satya Mohanty (satyamoh)