Re: [Isis-wg] [Bier] BAR field length in draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions
Eric C Rosen <erosen@juniper.net> Tue, 20 February 2018 19:43 UTC
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From: Eric C Rosen <erosen@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/isis-wg/COgmW4ZQudLW03aO5yTdSWQfiKk>
Subject: Re: [Isis-wg] [Bier] BAR field length in draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions
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On 2/20/2018 12:56 PM, arkadiy.gulko@thomsonreuters.com wrote: > > I personally like Eric proposed option -two independed 1Byte filed one > for IGP Algo and another one for BUAM : the "BIER Underlay Algorithm > Modifier" registry. The way the underlay paths are computed for a > given BIER sub-domain is determined by the pair of codepoints: <IGP > Algorithms codepoint, BIER Underlay Algorithm Modifier codepoint>. > > Not sure why it is not in a list of proposed options since I saw a lot > of support for it on the WG. > > It sort of Option-B but allow more independence between BAR(BUAM) from > IGP Algo > I'm also wondering what's wrong with this proposal as a way of moving forward. The only real change I'd make to it is that the first one-octet field would either be a codepoint from the IGP Algorithms registry or a Flex-Algo codepoint. Since the former are in the range 1-127 and the latter in the range 128-254, no ambiguity is possible. With regard to the question of why it makes sense to use an IGP Algorithms codepoint, I think the argument is the following. Per the architecture, BIER relies on a routing underlay to tell it the next hop for a given BFER. Per the architecture, the routing underlay may use the exact same decision procedure applied to the exact same topology as can be applied for unicast routing. One way of identifying a unicast routing decision procedure is with codepoints from the IGP Algorithms registry and/or Flex-Algo codepoints. Thus it makes sense for the IGP signaling to use these codepoints as a way of providing the BIER layer information about the routing underlay. With regard to the question of why it makes sense to have a second one-octet BIER-specific field, I think the argument is the following. The architecture does not require BIER to use a routing underlay that applies a decision procedure that is useful for or even applicable to unicast packets. In such a case, there might not be a way to identify the decision procedure with a codepoint from the IGP Algorithms registry or even with a Flex-Algo codepoint. So it's useful to have a codepoint that does not have to hold values from the IGP Algorithms registry and does not need to have Flex-Algo codepoints. There is also some worry that there may in the future be a lot of arguments about populating IGP Algorithms registry, and it would be good to have a way to extend BIER by allocating codepoints that help identify the routing underlay, but that might not be useful for unicast applications. To some extent, this is all a tempest in a teapot, because the extensible TLV structure can be used, as Alia points out, to work around any codepoint problems. Of course, continually adding TLVs to modify the interpretation of other TLVs can becomes a problem in itself. I think the most compelling argument for adding the second codepoint field is that it provide more options for exploring the issues that might arise as production deployments begin. I don't believe that any field containing a codepoint should ever be created without an association to a registry. That makes squatting and future codepoint clash inevitable. Thus I think the current documents, which have a one-octet field that is not associated with a registry at all, are not really acceptable. So I don't see any way to move forward now other than with a compromise like the one I suggested. This is not exactly Alia's option B, because the second codepoint is not properly thought of as a sub-type of the other.
- [Isis-wg] BAR field length in draft-ietf-bier-isi… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Toerless Eckert
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeffrey (Zhaohui) Zhang
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeff Tantsura
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Senthil Dhanaraj
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Senthil Dhanaraj
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Peter Psenak
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… arkadiy.gulko
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Acee Lindem (acee)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Eric C Rosen
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Peter Psenak
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeffrey (Zhaohui) Zhang
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Xiejingrong
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands (iwijnand)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeffrey (Zhaohui) Zhang
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands (iwijnand)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands (iwijnand)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeffrey (Zhaohui) Zhang
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… IJsbrand Wijnands (iwijnand)
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Alia Atlas
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Jeffrey (Zhaohui) Zhang
- Re: [Isis-wg] [Bier] BAR field length in draft-ie… Tony Przygienda