Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 address in Segment List of SRH
"Stefano Previdi (sprevidi)" <sprevidi@cisco.com> Fri, 10 February 2017 09:30 UTC
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 address in Segment List of SRH
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Date: Fri, 10 Feb 2017 09:30:52 +0000
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Cc: "draft-ietf-ospf-ospfv3-segment-routing-extensions@tools.ietf.org" <draft-ietf-ospf-ospfv3-segment-routing-extensions@tools.ietf.org>, 6man WG <ipv6@ietf.org>, "draft-ietf-6man-segment-routing-header@ietf.org" <draft-ietf-6man-segment-routing-header@ietf.org>, Mark Smith <markzzzsmith@gmail.com>, "ospf@ietf.org" <ospf@ietf.org>, Brian E Carpenter <brian.e.carpenter@gmail.com>
Subject: Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 address in Segment List of SRH
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the use of ll addresses in ospfv3 draft is a bug and should be fixed. s. > On Feb 10, 2017, at 12:41 AM, Acee Lindem (acee) <acee@cisco.com> wrote: > > > > On 2/9/17, 5:48 PM, "OSPF on behalf of Brian E Carpenter" > <ospf-bounces@ietf.org on behalf of brian.e.carpenter@gmail.com> wrote: > >> Mark, >> On 10/02/2017 08:26, Mark Smith wrote: >>> On 10 Feb. 2017 03:02, "Veerendranatha Reddy Vallem" < >>> veerendranatharv@huawei.com> wrote: >> ... >>>> If Link local address is Link local, how we can use this address in >>>> SRH header, >>>> since IPv6 destination address should not be link local address as per >>>> IPv6 protocol. >>> >>> I'd be curious where you might have got that idea from. >>> LL addresses are perfectly fine as destination addresses, including for >>> application traffic. They're even preferred over global and ULA >>> addresses >>> by default when there is a choice from a set. >> >> Right, but if an SR header is travelling off-link, which I think must >> often >> be the case, it would be doubleplus ungood to include a LL address, which >> is >> meaningless off-link. So probably using a LL address in SRH needs to be >> strictly limited. > > Agreed - even though the the link-local address is associated with the > OSPFv3 router¹s adjacency, in the IPv6 SR header there is no indication of > outgoing interface so the IPv6 packet cannot be forwarded unambiguously. > Note that we have a similar restriction for OSPFv3 AS-External-LSA and > NSSA-LSA forwarding address. From RFC 5340: > > > Forwarding address > A fully qualified IPv6 address (128 bits). Included in the LSA if > and only if bit F has been set. If included, data traffic for the > advertised destination will be forwarded to this address. It MUST > NOT be set to the IPv6 Unspecified Address (0:0:0:0:0:0:0:0) or an > IPv6 Link-Local Address (Prefix FE80/10). While OSPFv3 routes are > normally installed with link-local addresses, an OSPFv3 > implementation advertising a forwarding address MUST advertise a > global IPv6 address. This global IPv6 address may be the next-hop > gateway for an external prefix or may be obtained through some > other method (e.g., configuration). > > > The OSPFv3 Segment Routing Extensions draft will be updated to correct > this. > > Thanks, > Acee > > >> >> Brian >> >>> Many of the advantages of LLs for end-user applications would also >>> apply to >>> network applications such as SR. >>> >>> "How to use IPv6 Link-Local Addresses in Applications" >>> https://tools.ietf.org/html/draft-smith-ipv6-link-locals-apps-00 >>> >>> Regards, >>> Mark. >>> >>> >>> >>> If Adj-Sid is global ipv6 address, means we need to consider ³global >>> ipv6 interface address² of the neighbor on the link? >>> >>> >>> >>> Regards, >>> >>> Veerendranath >>> >>> >>> >>> >>> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list >>> ipv6@ietf.org >>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >>> >>> >>> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list >>> ipv6@ietf.org >>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >>> >> >> _______________________________________________ >> OSPF mailing list >> OSPF@ietf.org >> https://www.ietf.org/mailman/listinfo/ospf >
- [OSPF] [IPv6 SR] Regarding 128 bits IPv6 address … Veerendranatha Reddy Vallem
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Mark Smith
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Brian E Carpenter
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Acee Lindem (acee)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Veerendranatha Reddy Vallem
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Veerendranatha Reddy Vallem
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Veerendranatha Reddy Vallem
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Brian E Carpenter
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Veerendranatha Reddy Vallem
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Stefano Previdi (sprevidi)
- Re: [OSPF] [IPv6 SR] Regarding 128 bits IPv6 addr… Brian E Carpenter