On 2/9/17, 5:48 PM, "OSPF on behalf of Brian E Carpenter" <[email protected] on behalf of [email protected]> wrote:
>Mark, >On 10/02/2017 08:26, Mark Smith wrote: >> On 10 Feb. 2017 03:02, "Veerendranatha Reddy Vallem" < >> [email protected]> 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 >> [email protected] >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> >> >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> [email protected] >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> > >_______________________________________________ >OSPF mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/ospf _______________________________________________ OSPF mailing list [email protected] https://www.ietf.org/mailman/listinfo/ospf
