Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf
Santosh P K <santosh.pallagatti@gmail.com> Thu, 03 October 2019 14:45 UTC
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From: Santosh P K <santosh.pallagatti@gmail.com>
Date: Thu, 03 Oct 2019 20:15:29 +0530
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To: "Acee Lindem (acee)" <acee@cisco.com>
Cc: Pushpasis Sarkar <pushpasis.ietf@gmail.com>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" <lsvr@ietf.org>
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Subject: Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf
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All, If R-bit or H-bit functionality is being introduced then wanted to know should you not callout for use case here? Use-cases in applicability document does not cover this and would like to also understand how this can be used CLOS and non-CLOS/FAT-tree topology. Thanks Santosh P K On Wed, Oct 2, 2019 at 6:10 AM Acee Lindem (acee) <acee@cisco.com> wrote: > Hi Pushpasis, > > > > *From: *Pushpasis Sarkar <pushpasis.ietf@gmail.com> > *Date: *Tuesday, October 1, 2019 at 3:34 PM > *To: *Acee Lindem <acee@cisco.com> > *Cc: *"YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" < > lsvr@ietf.org> > *Subject: *Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Hi Acee, > > > > Just saw the latest version of the draft. I wanted to understand what is > the exact difference between the values 1 and 2. Just to clarify my doubt > let's consider a prefix P that is only originated by node N. Now what will > be the reachability of prefix P in the two scenarios (first with SPF Status > TLV value set to 1 vs with SPF Status TLV value set to 2). Will P be > unreachable in both cases? My understanding is it should still be reachable > when the value is set to 2. > > > > If my understanding is correct, then perhaps we need more clarifications > on the following text.. especially for the case there is no next link from > this node. > > > > "If the current Node NLRI attributes includes the SPF status > > TLV (Section 4.1.2) and the status indicates that the Node > > doesn't support transit, the next link for the current node is > > processed." > > > > If the P is unreachable in the later case too (value set to 2), then I > don't see what is the difference between using the values 1 and 2. > > > > In this case, the current node is not unreachable as we’ve already taken > it off the candidate list and processed the local prefixes. Optionally, the > interface addresses on the current node have also been installed. At this > point, we are simply not using any of the links in the SPF graph which will > have the effect of preventing transit traffic. > > > > Thanks, > > Acee > > > > Thanks > > -Pushpasis > > > > > > > > > > > > > > On Sun, Sep 29, 2019 at 12:15 PM Acee Lindem (acee) <acee@cisco.com> > wrote: > > After discussion with my co-authors and Pushpasis, we are planning on > defining an SPF Status TLV for the Node Attribute NLRI analogous to the one > defined for Links and Prefixes. However, for the Node Attribute TLV, the > status would have an additional value indicating the node should not be > used for transit traffic. > > > > 0 – Reserved > > 1 – Node unreachable with respect to BGP SPF > > 2 – Node does not support transit with respect > to BGP SPF > > 3-254 – Undefined > > 255 – Reserved > > > > Comments? > > > > Thanks, > > Acee > > > > > > *From: *Lsvr <lsvr-bounces@ietf.org> on behalf of Acee Lindem < > acee@cisco.com> > *Date: *Thursday, September 26, 2019 at 10:15 AM > *To: *Pushpasis Sarkar <pushpasis.ietf@gmail.com> > *Cc: *"YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" < > lsvr@ietf.org> > *Subject: *Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Hi Pushpasis, > > This OSPFv3 R Bit and IS-IS O bit are basically the same functionality. > The node is not used for transit but is used for local prefixes. > > Thanks, > > Acee > > > > *From: *Pushpasis Sarkar <pushpasis.ietf@gmail.com> > *Date: *Thursday, September 26, 2019 at 2:53 AM > *To: *Acee Lindem <acee@cisco.com> > *Cc: *"YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" < > lsvr@ietf.org> > *Subject: *Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Hi Chaitanya and Acee, > > > > How about the 'O' bit in Node-Flag-Bits TLV defined in RFC 7752 section > 3.3.1.1? I suppose the node can set the 'O' bit when it wants to take > itself out from all transit paths. I know the 'O' bit is more related to > the scenario when ISIS topology is being exported in BGP-LS. But I suppose > we can use that for BGP-LS-SPF as well. > > > > Thanks > > -Pushpasis > > > > On Tue, Sep 24, 2019 at 8:35 PM Acee Lindem (acee) <acee@cisco.com> wrote: > > Hi Chaitanya, > > I think this is a good idea and will discuss with my co-authors. > > Thanks, > Acee > > > > *From: *"YADLAPALLI, CHAITANYA" <cy098d@att.com> > *Date: *Tuesday, September 24, 2019 at 11:02 AM > *To: *Acee Lindem <acee@cisco.com>, "lsvr@ietf.org" <lsvr@ietf.org> > *Subject: *RE: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Correct like a R-Bit. > > > > I have read this draft and I support it. > > > > Thanks, > > Chaitanya > > > > > > This communication may contain information that is privileged, or > confidential. If you are not the intended recipient, please note that any > dissemination, distribution or copying of this communication is strictly > prohibited. Anyone who receives this message in error should notify the > sender immediately by telephone or by return e-mail and delete it from his > or her computer. > > > > > > > > *From:* Acee Lindem (acee) <acee@cisco.com> > *Sent:* Tuesday, September 24, 2019 10:42 AM > *To:* YADLAPALLI, CHAITANYA <cy098d@att.com>; lsvr@ietf.org > *Subject:* Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Hi Chaitanya, > > > > Exactly what do you mean by node cost out and what use case are you trying > to satisfy. If a node wants to remove itself from the topology, it can > simply withdraw its link NLRI. However, are you looking for a mechanism > similar to the OSPFv3 R-Bit as a Node NLRI SPF Attribute? > > > > R-bit > > This bit (the `Router' bit) indicates whether the originator is an > > active router. If the router bit is clear, then routes that > > transit the advertising node cannot be computed. Clearing the > > router bit would be appropriate for a multi-homed host that wants > > to participate in routing, but does not want to forward non- > > locally addressed packets. > > > > Thanks, > Acee > > > > > > > > > > *From: *Lsvr <lsvr-bounces@ietf.org> on behalf of "YADLAPALLI, CHAITANYA" > <cy098d@att.com> > *Date: *Tuesday, September 24, 2019 at 10:31 AM > *To: *"lsvr@ietf.org" <lsvr@ietf.org> > *Subject: *[Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf > > > > Hi Authors, > > The draft does not explicitly call out mechanisms for node cost out. It > would be good to call out mechanisms to cost out a node explicitly. > > > > Thanks, > > Chaitanya > > > > > > *Chaitanya Yadlapalli* > > Network Infrastructure And Services > > > > *AT&T Services, Inc.* > > 200 S Laurel Ave, Middletown, NJ 07722 > > o 732.420.7977 | cy098d@att.com > > > > This communication may contain information that is privileged, or > confidential. If you are not the intended recipient, please note that any > dissemination, distribution or copying of this communication is strictly > prohibited. Anyone who receives this message in error should notify the > sender immediately by telephone or by return e-mail and delete it from his > or her computer. > > > > > > _______________________________________________ > Lsvr mailing list > Lsvr@ietf.org > https://www.ietf.org/mailman/listinfo/lsvr > > _______________________________________________ > Lsvr mailing list > Lsvr@ietf.org > https://www.ietf.org/mailman/listinfo/lsvr >
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf YADLAPALLI, CHAITANYA
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf YADLAPALLI, CHAITANYA
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Jason Black
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Jeff Tantsura
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K