Thanks for the clarification Peter!

Paul

On Thu, Sep 25, 2025 at 5:58 AM Peter Psenak <[email protected]> wrote:

> Hi Paul,
>
> please se inline:
>
> On 25/09/2025 04:38, Paul Wouters via Datatracker wrote:
> > Paul Wouters has entered the following ballot position for
> > draft-ietf-lsr-igp-ureach-prefix-announce-10: No Objection
> >
> > When responding, please keep the subject line intact and reply to all
> > email addresses included in the To and CC lines. (Feel free to cut this
> > introductory paragraph, however.)
> >
> >
> > Please refer to
> https://www.ietf.org/about/groups/iesg/statements/handling-ballot-positions/
> > for more information about how to handle DISCUSS and COMMENT positions.
> >
> >
> > The document, along with other ballot positions, can be found here:
> >
> https://datatracker.ietf.org/doc/draft-ietf-lsr-igp-ureach-prefix-announce/
> >
> >
> >
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> >
> > Are there any operational considerations worth mentioning in the
> document?
> I believe we mentioned the ones that exists in the appropriate sections
> - 3.3, 4.3, 5, 6,
> > Would setting the UP flag cause other properly implemented systems not
> > supporting the flag to change behaviour?
>
> absolutely not. All routers understand the "unreachable" metric that we
> use for UPA because such metric is part of the base protocol specification.
> As a result, all routers, regardless whether they understand the new
> flags or not, will ignore UPA advertisement during the route calculation.
>
> Routers that understand the new flags and are configured to use them
> will do so on top.
>
> thanks,
> Peter
>
> > I assume this would not be the case
> > and that is why no operational considerations were added?
>
> >
> >
> >
> >
>
>
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