Hi Robert, On R2, the label 33 learnt from T-LDP should be the outgoing label, rather than the ingoing label for FEC 3.3.3.3/32, one of the incoming labels for FEC 3.3.3.3/32 should be 1033. Another incoming label for FEC 3.3.3.3/32 is a label (e.g., 44) allocated by the LDP module. In other word, when receiving a packet with top label of either 1033 or 44, that top label would be swapped to 33.
Best regards, Xiaohu > -----邮件原件----- > 发件人: spring [mailto:[email protected]] 代表 Robert Raszuk > 发送时间: 2014年5月21日 22:08 > 收件人: Xuxiaohu > 抄送: Yakov Rekhter; [email protected]; Hannes Gredler; John G. Scudder; Alvaro > Retana (aretana) > 主题: Re: [spring] 答复: 答复: 答复: draft-gredler-spring-mpls-05.txt as > SPRING WG document > > Hi Xu, > > Sure .. please see attached CONCRETE example. > > Best, > R. > > On Wed, May 21, 2014 at 10:38 AM, Xuxiaohu <[email protected]> > wrote: > > > > > >> -----邮件原件----- > >> 发件人: [email protected] [mailto:[email protected]] 代表 Robert > Raszuk > >> 发送时间: 2014年5月21日 16:12 > >> 收件人: Xuxiaohu > >> 抄送: Yakov Rekhter; Hannes Gredler; [email protected]; John G. Scudder; > >> Alvaro Retana (aretana) > >> 主题: Re: [spring] 答复: 答复: draft-gredler-spring-mpls-05.txt as SPRING > >> WG document > >> > >> Xu, > >> > >> You do not get the concept of global (domian wide) label. > > > > Maybe. > > > >> You can't attach to a packet SR header with labels (SIDs) learned by > >> ISIS and in the segment nodes use LDP learned labels for forwarding in your > data plane. > > > > Why can't? Please give a CONCRETE example and then assert who don’t > > get the concept of MPLS and SR:) > > > > Best regards, > > Xiaohu > > > >> That's the issue with consistency of label for a given FEC > >> distributed by more then one protocol within your domain. > >> > >> Best, > >> R. > >> > >> On Wed, May 21, 2014 at 10:01 AM, Xuxiaohu <[email protected]> > >> wrote: > >> > No, I don't think so. As long as a label for a given 32/ or 128/ > >> > FEC is attached to > >> a packet, no matter from whichever label distribution protocol this > >> label is learnt, the packet would definitely be forwarded to the node > >> identified by that FEC along the shortest path. > >> > > >> > Could you give a concrete example to illustrate why the forwarding > >> > result is > >> rather poor? > >> > > >> > Best regards, > >> > Xiaohu > >> > > >> >> -----邮件原件----- > >> >> 发件人: [email protected] [mailto:[email protected]] 代表 Robert > >> Raszuk > >> >> 发送时间: 2014年5月21日 15:41 > >> >> 收件人: Xuxiaohu > >> >> 抄送: Hannes Gredler; [email protected]; Alvaro Retana (aretana); John G. > >> >> Scudder; Yakov Rekhter > >> >> 主题: Re: [spring] 答复: draft-gredler-spring-mpls-05.txt as SPRING WG > >> >> document > >> >> > >> >> If your SR segments are to be engineered by set of SR headers for > >> >> a given FEC and anywhere in the network you will suddenly choose > >> >> LDP learned label for a given FEC the forwarding results will be > >> >> rather poor don't > >> you think ? > >> >> > >> >> r. > >> >> > >> >> On Wed, May 21, 2014 at 9:33 AM, Xuxiaohu <[email protected]> > >> wrote: > >> >> > Robert, > >> >> > > >> >> >> -----邮件原件----- > >> >> >> 发件人: [email protected] [mailto:[email protected]] 代表 > Robert > >> >> Raszuk > >> >> >> 发送时间: 2014年5月21日 15:25 > >> >> >> 收件人: Xuxiaohu > >> >> >> 抄送: Hannes Gredler; Yakov Rekhter; [email protected]; Alvaro > >> >> >> Retana (aretana); John G. Scudder > >> >> >> 主题: Re: [spring] draft-gredler-spring-mpls-05.txt as SPRING WG > >> >> >> document > >> >> >> > >> >> >> Xiaohu, > >> >> >> > >> >> >> > Since there are just label distribution protocols which don't > >> >> >> > affect the route selection at all, why do you care about that > >> >> >> > consistency among > >> >> >> routers? > >> >> >> > >> >> >> We are talking about label selection and not route selection. > >> >> >> > >> >> >> This is about the same FEC so same route hence route selection > >> >> >> does not come to the picture. > >> >> > > >> >> > Sure. Then what's the problem if there is inconsistency of label > >> >> > selection > >> >> among routers (e.g., some routers prefer label bindings learnt > >> >> from ISIS while others prefer label bindings learnt from LDP)? > >> >> > > >> >> > Best regards, > >> >> > Xiaohu > >> >> > > >> >> >> Thx, > >> >> >> R. > >> >> > _______________________________________________ > >> >> > spring mailing list > >> >> > [email protected] > >> >> > https://www.ietf.org/mailman/listinfo/spring > >> > _______________________________________________ > >> > spring mailing list > >> > [email protected] > >> > https://www.ietf.org/mailman/listinfo/spring > > _______________________________________________ > > spring mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/spring _______________________________________________ spring mailing list [email protected] https://www.ietf.org/mailman/listinfo/spring
