Re: [sidr] Benjamin Kaduk's No Objection on draft-ietf-sidr-slurm-07: (with COMMENT)

Di Ma <madi@rpstir.net> Fri, 30 March 2018 19:49 UTC

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From: Di Ma <madi@rpstir.net>
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Date: Sat, 31 Mar 2018 03:49:39 +0800
Cc: The IESG <iesg@ietf.org>, morrowc@ops-netman.net, draft-ietf-sidr-slurm@ietf.org, sidr@ietf.org, sidr-chairs@ietf.org
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To: Benjamin Kaduk <kaduk@mit.edu>
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Subject: Re: [sidr] Benjamin Kaduk's No Objection on draft-ietf-sidr-slurm-07: (with COMMENT)
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Benjamin,

Thanks very much for your comments.

I will exchange notes with co-authors on your editorial suggestions.

Yet as for your question about slurmTarget, here is the explanation.

First of all, the FQDN is used by the SLURM file distributor to determine which RP will use this slurm file, noting that RP is identified by FQDN. 

People might think this design is sort of redundancy, arguing that if the SLURM file distributor does not want a specific RP to effect SLURM, just not do that, why bother to throw this file to that RP, indicating ’this file is not for you’.

The reason why we do this is to provide the scalability for SLURM in operations.

Given a SLURM file distributor service several RPs and SLURM file need to change at times to reflect local policy. 

An easy to do so is that all the registered RPs simply synchronize with SLURM file distributor, telling from the slurmTarget to decide whether to effect ‘a specific version’ of slurm file 'this time'. 

All in all, to answer your question, if the same SLURM file is provided to multiple RPs, those RPs identified by FQDN, will first to see whether ‘this version’ of slurm file is for itself 'this time'. 

And then an RP uses this slurm file to form different views for different BGP speakers as specified by slrumtarget ASN.

BTW, as stated in the document, if the operator does not want to use slrumtarget ‘hostname’ to gain management granularity, just not put it into a slrumtarget element.

I hope my clarification is making sense here.

Di


> Does this mean that if the same SLURM file is
> provided to multiple RPs, those RPs both need to be "responsible
> for" all the ASNs and FQDNS contained therein?  Would this present a
> limit on the ability to reuse SLURM files for multiple recipients
> within a single administrative domain (that may span multiple ASNs
> and FQDNs)?



Di  Ma
RPSTIR
https://bgpsecurity.net

> 在 2018年3月31日,01:54,Benjamin Kaduk <kaduk@mit.edu> 写道:
> 
> Benjamin Kaduk has entered the following ballot position for
> draft-ietf-sidr-slurm-07: No Objection
> 
> When responding, please keep the subject line intact and reply to all
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> introductory paragraph, however.)
> 
> 
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-sidr-slurm/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> The directorate reviews have some good comments, especially about expanding
> acronyms/defining terms.
> 
> I think Section 3.3 would benefit from greater clarity about individual
> components of the JSON array that is the value of the "slurmTarget" element,
> versus that element itself.  (Also, slurmTarget appears to be mandatory, so
> talking about cases where it is present seems strange, and presumably a
> nonempty value being present is the desired criterion.)
> 
> I'm also not entirely sure I understand the intended semantics --
> when first introduced in Section 3.2, we say that "all targets MUST
> be acceptable to the RP".  (Presumably that includes both ASN and
> FQDN entries.) Does this mean that if the same SLURM file is
> provided to multiple RPs, those RPs both need to be "responsible
> for" all the ASNs and FQDNS contained therein?  Would this present a
> limit on the ability to reuse SLURM files for multiple recipients
> within a single administrative domain (that may span multiple ASNs
> and FQDNs)?
> 
> Some editorial suggestions follow.
> 
> Abstract:
> 
> OLD:
> 
>   [...] ISPs can also be able to use the RPKI to validate the
>   path of a BGP route.
> 
> NEW:
> 
>   [...] ISPs can also use the RPKI to validate the
>   path of a BGP route.
> 
> Section 3.2
> 
> OLD:
>   o  A SLURM Version indication that MUST be 1
> 
> NEW:
>   o  A SLURM Version indication.  This document specifies version 1.
> 
> Also, in
> 
>      *  Zero or more target elements.  In this version of SLURM, there
>         are two types of values for the target: ASN or Fully Qualified
>         Domain Name(FQDN).  If more than one target line is present,
>         all targets MUST be acceptable to the RP.
> 
> What's the difference between a target element and a target line?
> 
> Section 3.5 (both subsections):
> 
> "is locally configured with" does not mention SLURM at all as being
> involved in that configuration; perhaps it should.
> 
> Section 4.2
> 
>   [...] To do so, the RP MUST
>   check the entries of SLURM file with regard to overlaps of the INR
>   assertions and report errors to the sources that created these SLURM
>   files in question.
> 
> The "report errors to the sources" part seems ineligible for
> MUST-level requirement.
> 
> Also, in case of conflict, does the "MUST NOT use them" apply to all
> SLURM files, only the ones with directly conflicting inputs, or only
> enough files to remove the conflict?
> 
> Section 6
> 
> I'm always a little sad to see security-relevant functionality (such
> as the transport with authenticity and integrity protection of SLRUM
> files over the network) left as out of scope with no examples of
> reasonable usage given.
> 
> I also wonder if we would benefit from a little discussion of the
> potential routing issues that could arise from using a "broken" (or
> deliberately adversarial) SLURM file, though I expect that the
> target audience is probably pretty familiar with these already.
> 
> 
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