Re: Destination Preference Attribute for BGP

[Tom Beecher <beecher () beecher cc>]

> What I am saying is that for those that have been fixed, unless someone
> can offer up any additional evidence in 2023, the size of the number of BGP
> communities attached to a path does not scream "danger" in 2023 hardware.
> And the T1600 is a looooong time ago.

Again, as it was stated, the size of or number of BGP communities wasn't
the problem anyway; it was hashing / memory storage. And you know what?
Hashing / memory storage HAS been a problem with multiple vendors in many
other contexts, not just BGP community stuff. Has nothing to do with "2023
hardware". You can bog down top of the line DDR5 memory pretty easily if
you make certain coding choices.

You can choose ( as you apparently have ) to just presume that a problem
that happened before won't ever happen again. Prob not a great idea though.



On Mon, Aug 21, 2023 at 11:48 PM Mark Tinka <mark@tinka.africa> wrote:

> On 8/21/23 17:44, Tom Beecher wrote:
>
> So, while this all sounds good, without any specifics on vendor, box,
> > code, code revision number, fix, year it happened, current status, e.t.c.,
> > I can't offer any meaningful engagement.
>
> If you clicked Matt's link to the Google search, you could tell from the
> results what vendor , model, and year it was pretty quickly.
>
>
> I did.
>
> Those are headlines.
>
> The solider that was on the battlefield won't speak to the exact details.
>
> I won't press, especially because nobody that needed a T1600 back then
> probably still runs one today.
>
>
> Assertion Made : "Networks can scrub communities for memory or convergence
> reasons."
> Others : "That doesn't seem like a concern. "
> Matt : "Here was a real situation that happened where it was a concern,
> and the specifics on the reason why."
>
> How is that not 'moving the needle? Because you didn't get full
> transcripts of his conversation with the vendor?.  I'm sure a lot of people
> didn't even know that hashing / memory hotspotting was even a thing. Now
> they do.
>
>
> There are a lot of things that vendors have fixed in BGP that we shall
> never know.
>
> What I am saying is that for those that have been fixed, unless someone
> can offer up any additional evidence in 2023, the size of the number of BGP
> communities attached to a path does not scream "danger" in 2023 hardware.
> And the T1600 is a looooong time ago.
>
> Mark.