Re: [Lsr] LSR: Using DSCP for path/topology selection Q

Toerless,

On 15/11/18 03:29 , Toerless Eckert wrote:
> Whats the current best guidance on using DSCP for selection of path,
> specifically for selection of topology with MTR (RFCs 4915, 5120, 7722) ?
>
> My understanding from history is that this looked like a good idea
> to customers first, but when implementations became available,
> customers really did not want to implement it because of the overloading
> of DSCP between QoS and routing and the resulting management complexity.
>
> Has the idea of using DSCP for path selection been re-introduced in any
> later work like flex-Algos ?

no, but if someone wanted to do so it can.
draft-ietf-lsr-flex-algo does not say anything about DHCP.

thanks,
Peter

>
> If there could be rough consensus that this is in general a bad idea, i wonder
> if it would be appropriate to have a short normative document from LSR
> defining that the use of DSCP for topology selection is historic and
> not recommended anymore and make this an update to above three RFCs,
> maybe also pointing out that there are other methods to select a
> topology and those remain viable:
>
> I specifically would not like to see the actual MTR RFCs to be changed
> in status, because MTR actually does work quite well and is supported
> in products and deployed with IP multicast, even with multiple
> topologies for IP multicast in live-live scenarios.
>
> Thanks!
>      Toerless
>
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