Hi Acee,
On 28/08/2025 19:58, Acee Lindem wrote:
On Aug 28, 2025, at 1:26 PM, Peter Psenak <[email protected]> wrote:
Hi Acee,
On 22/08/2025 23:33, Acee Lindem wrote:
Speaking as WG member:
I think the requirements for this draft are "soft" given that the only example
provided is the multicast distribution which has been satisfied for decades using a
separate multicast topology.
MT does not give you the option to calculate paths based on various metrics
(e.g., delay, TE, bandwidth), use constraints, etc. That's what flex-algo
provides.
In short, the draft suffers from "ED" which in this case is "Exemplar
Deficiency". I'm certainly not going to support adoption until I see a more compelling use
case.
Flex-algo is strictly bound to a specific data-plane today - e.g., SR-MPLS.
SRv6, IP-Algo. The reason for that is that an algo specific forwarding is
needed and these data-planes are giving you that.
The use case in this draft is to make flex-algo available for applications that
require algo specific paths without the need for any of these data-planes. Such
Flex-algo paths are not used for forwarding directly, but rather by
applications that create their own data-plane with the help of the flex-algo
paths. You can think of it as a distributed path calculation service that
provides you the loop free constraint based paths on top of IGP topology for
any app that needs it.
What I’m saying is the forwarding plane doesn’t have to exist today for the
multicast topology be used for multicast RPF. Please capture the reasoning as
to why a separate data plane is required. Point out that while flex-algorithm
can be topology specific, the SR-MPLS and IP flex algorithms are NOT topology
specific. You guys understand this - just put it in the draft.
sure. The new data plane is required, because in flex-algo routers must
advertise their participation in flex-algo and that participation is
data-plane specific.
thanks,
Peter
Thanks,
Acee
thanks,
Peter
Thanks,
Acee
On Aug 22, 2025, at 5:22 PM, Acee Lindem <[email protected]> wrote:
LSR WG,
The begins the LSR WG adoption call for "IGP Flex Soft Dataplane" -
draft-ginsberg-lsr-flex-soft-dataplane-01. Please express your support or objection on
this list prior to Saturday September 6, 2025.
Thanks,
Acee
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