Re: [Lsr] I-D Action: draft-ietf-lsr-igp-flex-algo-reverse-affinity-02.txt

Hi,

> When Flex-Algorithm calculation processes the link A to B, it may look at
> the 'colors' of the link in the reverse direction, e.g., link B to A.
This would
> allow the operator to exclude such link from the Flex-Algorithm topology.

Why do we need the notion of "reverse direction" to be any different then
the notion of forward direction from node B to A on a link ?

Can't we just use the reverse metrics locally by computing node without
flooding
anything new ?

> An operator may measure the rate of such input errors and set certain
'color' on a link
> locally on node B when the input error rate crosses a certain threshold.

IMO the draft should go into more detail or at least provide a pointer to
another document with description how to protect from continued churn in
propagating those colors when oscillate and go below and above a set
threshold many times per second.

Then aside from reducing the propagation frequency local protection from
continued SPF runs should also be mentioned. I guess you assume that this
is in place anyway.

> The IS-IS Flexible Algorithm Exclude Reverse Admin Group (FAERAG)

I think "FAERAG" is very hard to say. How about just "ERAG" as an acronym ?

Thx,
R.

On Mon, Mar 18, 2024 at 9:12 AM <internet-drafts@ietf.org> wrote:

> Internet-Draft draft-ietf-lsr-igp-flex-algo-reverse-affinity-02.txt is now
> available. It is a work item of the Link State Routing (LSR) WG of the
> IETF.
>
>    Title:   IGP Flexible Algorithms Reverse Affinity Constraint
>    Authors: Peter Psenak
>             Jakub Horn
>             Amit Dhamija
>    Name:    draft-ietf-lsr-igp-flex-algo-reverse-affinity-02.txt
>    Pages:   9
>    Dates:   2024-03-18
>
> Abstract:
>
>    An IGP Flexible Algorithm (Flex-Algorithm) allows IGPs to compute
>    constraint-based paths.
>
>    This document extends IGP Flex-Algorithm with additional constraints.
>
> The IETF datatracker status page for this Internet-Draft is:
>
> https://datatracker.ietf.org/doc/draft-ietf-lsr-igp-flex-algo-reverse-affinity/
>
> There is also an HTMLized version available at:
>
> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-igp-flex-algo-reverse-affinity-02
>
> A diff from the previous version is available at:
>
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-igp-flex-algo-reverse-affinity-02
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>
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