Re: [Lsr] Working Group Last Call for draft-ietf-lsr-ip-flexalgo-04 - "IGP Flexible Algorithms (Flex-Algorithm) In IP Networks"

[Gyan Mishra <[e-mail]>]

I support WG adoption of IP Flex Algo as an extension to the base IGP Flex
Algo.

This is a highly valuable extension for operators that can now apply to any
IP based networks.

One of the major benefits to migrating SR is being  able to use Flex Algo
for network slicing capabilities.

Now with IP Flex Algo you don’t need SR and this has great applicability
for DC NVO constraint based steering capabilities as well as maybe other IP
environments where steering capabilities is desired but you don’t want the
MPLS or SR complexity.

 One follow on question for authors is if IP Flex Algo is used on the same
link with IGP Flex Algo  are there any compatibility issues?

The IP Flex Algo draft I believe should mirror all the sections in the IGP
Flex Algo draft with new Sub TLV defined for IP Flex Algo.  I see the Admin
group coloring sections omitted.  I don’t see why you cannot have admin
group for include and exclude links which I think should apply to IP Flex
Algo as well.

Peter

>From the discussion point #3 with Ketan, Ketan is Ok with the two options
of updates below.

As IP Flex Algo would be an extension to the base IGP Flex Algo please use
update Option #2.

Option #1 This is if each application is standalone per data plane  and is
not an extension and so IGP Flex Algo would not be a base specification.


NEW

>     An IGP Flexible Algorithm (Flex-Algorithm) allows the IGP to compute
>     constraint-based paths. The  IGP Flex-Algorithm specification
>     currently only supports Segment Routing with (SR) data planes - SR
MPLS and
>     SRv6.
>
>     This document specifies IGP Flex-Algorithm, so that it can be used
 in any IP network
>     for native  IPv4 and IPv6 forwarding in the absence of SR.



Option #2 Verbiage if IGP Flex Algo is a base and this draft is an
extension and updates the base.  We don’t have to say IGP Flex Algo
currently only supports dropping the word currently as we are now extending
with IP Flex Algo.

> NEW
>
>     An IGP Flexible Algorithm (Flex-Algorithm) allows the IGP to compute
>     constraint-based paths. The base IGP Flex-Algorithm specification
only supports the  Segment Routing with (SR) data planes - SR MPLS and SRv6.
>
>     This document extends IGP Flex-Algorithm, so that it can be used
>     natively with IPv4 and IPv6 forwarding.


Kind Regards

Gyan

On Thu, Apr 7, 2022 at 3:07 PM Acee Lindem (acee) <acee=
[e-mail]> wrote:

> This begins a WG last call for draft-ietf-lsr-ip-flexalgo-04.  The draft
> had a lot of support and discussion initially and has been stable for some
> time. Please review and send your comments, support, or objection to this
> list before 12 AM UTC on April 22nd, 2022.
>
>
>
> Thanks,
> Acee
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*Gyan Mishra*

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