Re: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt
Shraddha Hegde <shraddha@juniper.net> Thu, 11 May 2017 06:50 UTC
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From: Shraddha Hegde <shraddha@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "internet-drafts@ietf.org" <internet-drafts@ietf.org>, "i-d-announce@ietf.org" <i-d-announce@ietf.org>
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Thread-Topic: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt
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Date: Thu, 11 May 2017 06:49:57 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ospf/P7AsquxFu1TXJK8CySrFHNfr2lE>
Subject: Re: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt
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Peter, It is clearly specified that ABR originating prefixes from other areas should have NP Bit set. "The NP-Flag (No-PHP) MUST be set for Prefix-SIDs allocated to inter- area prefixes that are originated by the ABR based on intra-area or inter-area reachability between areas. When the inter-area prefix is generated based on a prefix which is directly attached to the ABR, the NP-Flag SHOULD NOT be set." The same behavior should apply to mapping server advertised advertisements as well. " 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]." While the text above captures the case of directly attached prefixes it does not cover the Case of re-distributed prefixes for mapping server advertisements. Suggest to add below text. "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 re-set for this prefix as described in section 2.1 of [RFC7684] then PHP MUST not be done" Rgds Shraddha -----Original Message----- From: Peter Psenak [mailto:ppsenak@cisco.com] Sent: Wednesday, May 10, 2017 12:33 PM To: Shraddha Hegde <shraddha@juniper.net>; internet-drafts@ietf.org; i-d-announce@ietf.org Cc: ospf@ietf.org Subject: Re: [OSPF] I-D Action: draft-ietf-ospf-segment-routing-extensions-13.txt 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-exten > sions/ > > 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-exte > nsions-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