Hi, Tony: Aijun Wang China Telecom
> On May 21, 2021, at 23:29, Tony Li <[email protected]> wrote: > > > > Hi Aijun, > >> I support the adoption of the “FAD constraint sub-TLV” part(Section 3), but >> not support the introduce of “Bandwidth Metric Advertisement” part (Section >> 4) and other related parts. > > > As I understand it, we don’t get a line item veto, so I don’t know how the > chairs will take this. [WAJ] The reasonable solution is to take out of the controversial part from the adopted document. > > >> With the introduce of additional constraint information, the problem >> described in “Introduction” part(Section 1) can be solved. > > > Please say more. Claims without rationale are not reasoning. [WAJ] The introduction part talks mainly how to divert the elephant traffic away from the low bandwidth link. This can be achieved via the introduction of additional constraints information for Flex-ALGO. > > >> The usage of bandwidth metric in large network is not feasible. > [WAJ] The main reason is that bandwidth metric is not cumulative. > > Ditto. > > >> And, would you like to explain more for the following statements(in Section >> 4.1.1.2) >> “In the interface group mode, every node MUST identify the set of >> parallel links between a pair of nodes based on IGP link >> advertisements and MUST consider cumulative bandwidth of the parallel >> links while arriving at the metric of each link.” >> based on example described in Figure 7? > > > The paragraph immediately above explains exactly that. B->C has two parallel > 10Gbps links, so it should be considered to be 20Gbps. > > >> How the cumulative bandwidth will be used to achieve the result that traffic >> from B to D will prefer B-C-F-D, not B-E-D? > > > B-C-F-D is 20Gbps. B-E-D is 10Gbps. [WAJ] OK, let’s add two nodes between node B and C, say they are node M and N. They have also two parallel links to B and C respectively. The two possible path from B to D will be: Path 1: B-M-N-C-F-D Path 2: B-E-D If the “reference bandwidth” is 100G, then metric for each link in B-M-N-C-F-D will be 5, the cumulative metric from B-D for Path 1 “B—N-C-F-D” will be 25, right? The metric for each link in B-E-D will be 10, the cumulative metric from B-D for Path 2 will be 20, right? How can you prefer to the high bandwidth path? > > Tony > > _______________________________________________ > Lsr mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/lsr
_______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
