Re: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt
Peter Psenak <ppsenak@cisco.com> Wed, 10 May 2017 07:02 UTC
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Date: Wed, 10 May 2017 09:02:38 +0200
From: Peter Psenak <ppsenak@cisco.com>
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To: Shraddha Hegde <shraddha@juniper.net>, "internet-drafts@ietf.org" <internet-drafts@ietf.org>, "i-d-announce@ietf.org" <i-d-announce@ietf.org>
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Subject: Re: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt
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Hi Shraddha, please see inline: On 10/05/17 07:34 , Shraddha Hegde wrote: > Authors, > > Apologies for being late with this comment in the process of standardization. > > The below section 5 describes the PHP for mapping server > > > " As the Mapping Server does not specify the originator of a prefix > advertisement, it is not possible to determine PHP behavior solely > based on the Mapping Server advertisement. However, PHP behavior > SHOULD be done in following cases: > > The Prefix is intra-area type and the downstream neighbor is the > originator of the prefix. > > The Prefix is inter-area type and downstream neighbor is an ABR, > which is advertising prefix reachability and is also generating > the Extended Prefix TLV with the A-flag set for this prefix as > described in section 2.1 of [RFC7684]." > > > The text says "PHP behavior" should be done in following cases. > In the second case here it's an ABR re-advertising a prefix and SID being advertised for this > Prefix from a mapping server. If we interpret "PHP behavior should be done" > As the penultimate router removing the label and forwarding the packet to ABR, > It does not work since the inner labels gets exposed at the ABR. above texts clearly specifies that PHP is done only for case where ABR is originating a prefix, not propagating it from other area. You can distinguish between the two based on the A-flag in the Extended Prefix TLV as specified in RFC7684, which the above text mentions. thanks, Peter > > Request authors to add clarification text around "PHP behavior". > > Rgds > Shraddha > > -----Original Message----- > From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of internet-drafts@ietf.org > Sent: Thursday, May 4, 2017 3:28 PM > To: i-d-announce@ietf.org > Cc: ospf@ietf.org > Subject: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt > > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Open Shortest Path First IGP of the IETF. > > Title : OSPF Extensions for Segment Routing > Authors : Peter Psenak > Stefano Previdi > Clarence Filsfils > Hannes Gredler > Rob Shakir > Wim Henderickx > Jeff Tantsura > Filename : draft-ietf-ospf-segment-routing-extensions-13.txt > Pages : 35 > Date : 2017-05-04 > > Abstract: > Segment Routing (SR) allows a flexible definition of end-to-end paths > within IGP topologies by encoding paths as sequences of topological > sub-paths, called "segments". These segments are advertised by the > link-state routing protocols (IS-IS and OSPF). > > This draft describes the OSPF extensions required for Segment > Routing. > > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-extensions/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions-13 > https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-extensions-13 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-extensions-13 > > > Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > OSPF mailing list > OSPF@ietf.org > https://www.ietf.org/mailman/listinfo/ospf > > _______________________________________________ > OSPF mailing list > OSPF@ietf.org > https://www.ietf.org/mailman/listinfo/ospf > . >
- [OSPF] I-D Action: draft-ietf-ospf-segment-routin… internet-drafts
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Shraddha Hegde
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Ketan Talaulikar Talaulikar (ketant)
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Peter Psenak
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Shraddha Hegde
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Erik Auerswald
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Peter Psenak
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Shraddha Hegde
- Re: [OSPF] I-D Action: draft-ietf-ospf-segment-ro… Peter Psenak