Re: [Lsr] OSPF Routing with Cross-Address Family Traffic Engineering Tunnels - draft-ietf-ospf-xaf-te-04.txt
Anton Smirnov <asmirnov@cisco.com> Thu, 25 October 2018 16:57 UTC
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To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
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From: Anton Smirnov <asmirnov@cisco.com>
Organization: Cisco Systems
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Date: Thu, 25 Oct 2018 18:57:11 +0200
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Subject: Re: [Lsr] OSPF Routing with Cross-Address Family Traffic Engineering Tunnels - draft-ietf-ospf-xaf-te-04.txt
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Hi Ketan, 1. I am not sure I understood the question. Your example says "using the TE topology from OSPFv2 to compute a tunnel". In that case TE router ID is an IPv4 address. So no, advertising IPv6 address won't help to identify the tunnel. 2. my opinion (not discussed with other authors): RFC 3906 is Informational RFC, so it is not mandatory for implementation to follow. I think we can insert mention to that RFC somewhere in the Introduction but wording should be sufficiently weak (like "one possible example of route computation algorithm..."). --- Anton On 10/24/18 12:06, Ketan Talaulikar (ketant) wrote: > > Hello All, > > I support this simple but important extension. > > A couple of minor comments on the draft: > > 1)Sec 3 says > > A node that implements X-AF routing SHOULD advertise, in the > corresponding Node Local Address sub-TLV, all X-AF IPv4 and IPv6 > addresses local to the router that can be used by Constrained SPF > (CSPF) to calculate MPLS TE LSPs. In general, OSPF SHOULD advertise > the IP address listed in the Router Address TLV [RFC3630 > <https://tools.ietf.org/html/rfc3630>] [RFC5329 > <https://tools.ietf.org/html/rfc5329>] > of the X-AF instance maintaining the MPLS TE database, plus any > additional local addresses advertised by the X-AF OSPF instance in > its Node Local Address sub-TLVs. An implementation MAY advertise > other local X-AF addresses. > > Generally speaking, should the IP address (TE router ID in common > terms) which is candidate for inclusion in the Router Address TLV not > be a MUST candidate for X-AF advertisement? > > I also have a question about the first statement with the SHOULD in > it. Consider we are using the TE topology from OSPFv2 to compute a > tunnel for use with OSPFv3. Any IPv6 addresses associated with the > OSPFv3 instance on a router would be advertised as a Node attribute > and would not help identify a specific link. So practically, if any > IPv6 addresses (if at all) were to be used for CSPF then it would just > identify the node – in this case, isn’t advertising the IPv6 address > (TE router ID used in Router Address TLV) sufficient? > > For practical deployment, it think it would help if this was clarified > that we really need only the TE Router ID Address to go X-AF in > most/general cases and not the others? > > 2)Isn’t the mapping algorithm in Sec 3 actually going to be used for > IGP short-cut use-case with its reference to the IGP cost of the > tunnel? If so, would a reference to rfc3906 be helpful in this document. > > Thanks, > > Ketan > > *From:*Lsr <lsr-bounces@ietf.org> *On Behalf Of *Acee Lindem (acee) > *Sent:* 23 October 2018 03:55 > *To:* lsr@ietf.org > *Subject:* [Lsr] OSPF Routing with Cross-Address Family Traffic > Engineering Tunnels - draft-ietf-ospf-xaf-te-04.txt > > This begins an LSR WG last call for the subject draft. Please send > your comments to this list prior to 12:00 AM GMT, November 13^th , > 2018. While its only an 8 page document, I added an extra week due to > the IETF. Please let me know if anyone needs any more time. > > https://datatracker.ietf.org/doc/draft-ietf-ospf-xaf-te/ > > Thanks, > Acee > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr
- [Lsr] OSPF Routing with Cross-Address Family Traf… Acee Lindem (acee)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Acee Lindem (acee)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Mankamana Mishra (mankamis)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Jeff Tantsura
- Re: [Lsr] OSPF Routing with Cross-Address Family … Ayan Banerjee
- Re: [Lsr] OSPF Routing with Cross-Address Family … Peter Psenak
- Re: [Lsr] OSPF Routing with Cross-Address Family … Les Ginsberg (ginsberg)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Ketan Talaulikar (ketant)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Van De Velde, Gunter (Nokia - BE/Antwerp)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Anton Smirnov
- Re: [Lsr] OSPF Routing with Cross-Address Family … Anton Smirnov
- Re: [Lsr] OSPF Routing with Cross-Address Family … Alexander Okonnikov
- Re: [Lsr] OSPF Routing with Cross-Address Family … Anton Smirnov
- Re: [Lsr] OSPF Routing with Cross-Address Family … Rakesh Gandhi (rgandhi)
- Re: [Lsr] OSPF Routing with Cross-Address Family … Ketan Talaulikar (ketant)