Thank you Gyan
On Sun, Apr 5, 2020 at 12:09 PM Peter Psenak <ppse...@cisco.com> wrote: > Hi Gyan, > > On 01/04/2020 03:43, Gyan Mishra wrote: > > Thank you both for your feedback. That really helps a lot and clarifies. > > > > So flex-algo can be used with SR-TE as part of the policy specifying a > > delay metric and also be used as part of the IGP flex algo cSPF. > > yes. > > > > > Their might be some slight nuances but overall as far as features for > > both SR-MPLS & SRv6 the SR-TE policy would require binding SID and have > > similarities with lose or strict with prefix-sid or ad-sid specified > > correct and all same features and functionality. Correct? > > yes. > > > > > Also for inter-as or inter-domain SR - for both SR-MPLS or SRv6 the > > SR-TE w/ binding sid could be used as well in place of traditional > > BGP-LU for inter-as or csc. Correct? > > yes. > > > > > So operators have the option to stay with inter-as BGP-LU or go with > > SR-TE which is more attractive and powerful with simplicity. > > agree. > > thanks, > Peter > > > > Kind regards > > > > Gyan > > > > On Tue, Mar 31, 2020 at 5:15 AM Ketan Talaulikar (ketant) > > <ket...@cisco.com <mailto:ket...@cisco.com>> wrote: > > > > Hi Gyan, > > > > To add to what Peter has clarified, SR Policy architecture also > > supports SRv6 (as you've pointed out in the references) - loose and > > strict paths as well as steering for colored BGP routes. > > > > Thanks, > > Ketan > > > > -----Original Message----- > > From: spring <spring-boun...@ietf.org > > <mailto:spring-boun...@ietf.org>> On Behalf Of Peter Psenak > > Sent: 31 March 2020 13:42 > > To: Gyan Mishra <hayabusa...@gmail.com > > <mailto:hayabusa...@gmail.com>>; SPRING WG <spring@ietf.org > > <mailto:spring@ietf.org>> > > Subject: Re: [spring] SRV6 - SR-TE support & Flex Alg support ? and > > comparison and contrast of those two steering strategies > > > > Hi Gyan, > > > > let me comment on the flex-algo aspect. Please see inline: > > > > On 30/03/2020 23:50, Gyan Mishra wrote: > > > > > > Does SRv6 support SR-TE and flex Alg? > > > > yes, it does support both. > > > > > > > > > > > Since SRv6 supports native traffic steering with SRH with end > prefix > > > sid and end.x adjacency sid you can achieve the basic steering and > > > ECMP capability with prefix sid lose or strict hop by hop with > every > > > node specified in SRH SL. > > > > > > I want to confirm that SRv6 fully supports all of the SR-TE > > > capabilities available with SR-MPLS with static lose or strict > paths > > > and coloring of vpn flows. > > > > > > From the SR policy draft I did see that section 4 lists segment > > types > > > and does appear to support SRv6 sid. > > > > > > > > > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-0 > > > 6 > > > > > > > > > 4 > > > > > < > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-06#section-4 > >. > > > Segment Types > > > > > > > > > > > > A Segment-List is an ordered set of segments represented as > > <S1, S2, > > > ... Sn> where S1 is the first segment. > > > > > > Based on the desired dataplane, either the MPLS label stack > > or the > > > SRv6 SRH is built from the Segment-List. However, the > > Segment-List > > > itself can be specified using different segment-descriptor > > types and > > > the following are currently defined: > > > > > > > > > Flex Alg - SRv6 support? > > > > yes. > > > > > > > > Flex Alg is orthogonal to SR TE as it provides IGP extensions for > > > constrained SPF versus traditional RSVP or SR-TE providing the > > > extensions for cSPF - basically another method of steering which > as > > > well is very powerful tool for operators. > > > > > > It does appear SRv6 supports flex Alg draft below. > > > > yes. > > > > > > > > https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-06 > > > > > > Abstract > > > > > > IGP protocols traditionally compute best paths over the network > based > > > on the IGP metric assigned to the links. Many network > > deployments > > > use RSVP-TE based or Segment Routing based Traffic > Engineering to > > > enforce traffic over a path that is computed using different > > metrics > > > or constraints than the shortest IGP path. This document > > proposes a > > > solution that allows IGPs themselves to compute constraint > based > > > paths over the network. This document also specifies a way > > of using > > > Segment Routing (SR) Prefix-SIDs and SRv6 locators to steer > > packets > > > along the constraint-based paths. > > > > > > > > > > > > What are the benefits of using SR-TE over flex Alg and vice versa? > > > > you can think of them as different tools in your SR-TE tool set. You > > pick them as you need them. They can be used independently in > > parallel or can even be combined together to give you even more > > flexibility. > > > > The principal difference is that SR-TE provisions point-to-point > > path(s) between two end-points, while flex-algo provides any to any > > paths between set of participating nodes. > > > > > > > > Also can SR-TE use flex Alg steered paths as the dynamic cSPF > paths? > > > > yes > > > > > > > > Can SR-TE use and specify flex Alg to be used for traffic > steering? > > > > yes > > > > thanks, > > Peter > > > > > > > > > > > Kind regards > > > > > > > > > Gyan > > > Verizon > > > Cell 301 502-1347 > > > -- > > > > > > Gyan Mishra > > > > > > Network Engineering & Technology > > > > > > Verizon > > > > > > Silver Spring, MD 20904 > > > > > > Phone: 301 502-1347 > > > > > > Email: gyan.s.mis...@verizon.com > > <mailto:gyan.s.mis...@verizon.com> <mailto:gyan.s.mis...@verizon.com > > <mailto:gyan.s.mis...@verizon.com>> > > > > > > > > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org <mailto:spring@ietf.org> > > https://www.ietf.org/mailman/listinfo/spring > > > > > > > > -- > > > > Gyan Mishra > > > > Network Engineering & Technology > > > > Verizon > > > > Silver Spring, MD 20904 > > > > Phone: 301 502-1347 > > > > Email: gyan.s.mis...@verizon.com <mailto:gyan.s.mis...@verizon.com> > > > > > > > > -- Gyan Mishra Network Engineering & Technology Verizon Silver Spring, MD 20904 Phone: 301 502-1347 Email: gyan.s.mis...@verizon.com
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