This is related to my early comment. The draft needs point out transport related encapsulation and transport independent encapsulation. The considerations for two types of encapsulations have difference.
To be able to support individual transport independent encapsulations, underlay transport needs a mechanism to distinguish carried payload. IMO: this is beyond the scope of the draft. Lucy -----Original Message----- From: nvo3 [mailto:[email protected]] On Behalf Of Xuxiaohu Sent: Tuesday, April 07, 2015 9:15 PM To: 'Erik Nordmark'; [email protected] Subject: Re: [nvo3] Encapsulation considerations Hi Erik, As it has said in the draft : "... We later expanded the scope somewhat to consider how the encapsulations would play with MPLS "transport", which is important because SFC and BIER seem to target being dependent of the underlying "transport"...", it would be necessary to consider the first nibble issue for those encapsulations which may be transported over MPLS. More specifically, for those encapsulations which may be directly encapsulated further with an MPLS header, they must not start with the value 4 (IPv4) or the value 6 (IPv6) in the first nibble. Otherwise, they would be mistakenly interpreted as IP payloads by transit LSRs and therefore be subjected to ECMP and potential packet misordering. Best regards, Xiaohu > -----Original Message----- > From: Erik Nordmark [mailto:[email protected]] > Sent: 2015年3月26日 5:01 > To: [email protected] > Subject: [nvo3] Encapsulation considerations > > > I presented part of this at the most recent NVO3 interim meeting.The > full 12 > areas of considerations where presented at RTGWG earlier this week. > The draft is > http://datatracker.ietf.org/doc/draft-rtg-dt-encap/ > and the slides are at > http://www.ietf.org/proceedings/92/slides/slides-92-rtgwg-8.pdf > > There is probably additional things in there to consider for NVO3, and advice > that can be reused to make it easier to move NVO3 forward. > > Regards, > Erik > > > _______________________________________________ nvo3 mailing list [email protected] https://www.ietf.org/mailman/listinfo/nvo3 _______________________________________________ nvo3 mailing list [email protected] https://www.ietf.org/mailman/listinfo/nvo3 _______________________________________________ nvo3 mailing list [email protected] https://www.ietf.org/mailman/listinfo/nvo3
