Re: [Lsr] https://tools.ietf.org/html/draft-wang-lsr-prefix-unreachable-annoucement-05

? Last time I looked @ it (and it's been a while) Open-R had nothing of
that sort, it was basically KV playing LSDB (innovative and clever in
itself). You think Kafka here? Which in turn needs underlying IGP however
and is nothing but BGP problems in new clothes having looked @ their
internal architecture and where it's goiing a while ago.

-- tony

On Wed, Mar 10, 2021 at 11:29 AM Robert Raszuk <robert@raszuk.net> wrote:

> Peter,
>
> > But suddenly the DOWN event distribution is considered
> > problematic. Not sure I follow.
>
> In routing and IP reachability we use p2mp distribution and flooding as it
> is required to provide any to any connectivity.
>
> Such spray model no longer fits services where not every endpoint
> participates in all services.
>
> So my point is that just because you have transport ready we should not
> continue to announce neither good nor bad news in spray fashion for
> services.
>
> Sure it works, but it is hardly a good design and sound architecture.
>
> It happened to BGP as the convenience of already having TCP sessions
> between nodes was so great that we loaded loads of stuff to go along basic
> routing reachability.
>
> And now it seems time came to do the same with IGPs :).
>
> I think unless we stop and define a real pub-sub messaging protocol (like
> FB does with open-R)  we will continue this.
>
> And to me it is like building a tower from the cards ... the higher you go
> the more likely your entire tower is to collapse.
>
> Cheers,
> R.
>
> PS.
>
> > with MPLS loopback address of all PEs is advertised everywhere.
>
> Is this a feature or a day one design bug later fixed by RFC5283 ?
>
>
>
>
> On Wed, Mar 10, 2021 at 9:10 AM Peter Psenak <ppsenak@cisco.com> wrote:
>
>> Robert,
>>
>>
>> On 09/03/2021 19:30, Robert Raszuk wrote:
>> > Hi Peter,
>> >
>> >      > Example 1:
>> >      >
>> >      > If session to PE1 goes down, withdraw all RDs received from such
>> PE.
>> >
>> >     still dependent on RDs and BGP specific.
>> >
>> >
>> > To me this does sound like a feature ... to you I think it was rather
>> > pejorative.
>>
>> not sure I understand your point with "pejorative"...
>>
>> There are other ways to provide services outside of BGP - think GRE,
>> IPsec, etc. The solution should cover them all.
>>
>> >
>> >     We want app independent way of
>> >     signaling the reachability loss. At the end that's what IGPs do
>> without
>> >     a presence of summarization.
>> >
>> >
>> > Here you go. I suppose you just drafted the first use case for OSPF
>> > Transport Instance.
>>
>> you said it, not me.
>>
>>
>> >
>> > I suppose you just run new ISIS or OSPF Instance and flood info about
>> PE
>> > down events to all other instance nodes (hopefully just PEs and no Ps
>> as
>> > such plane would be OTT one).  Still you will be flooding this to 100s
>> > of PEs which may never need this information at all which I think is
>> the
>> > main issue here. Such bad news IMHO should be distributed on a pub/sub
>> > basis only. First you subscribe then you get updates ... not get
>> > everything then keep junk till it get's removed or expires.
>>
>> with MPLS loopback address of all PEs is advertised everywhere. So you
>> keep the state when the remote PE loopback is up and you get a state
>> withdrawal when the remote PE loopback goes down.
>>
>> In Srv6, with summarization we can reduced the amount of UP state to
>> minimum. But suddenly the DOWN event distribution is considered
>> problematic. Not sure I follow.
>>
>> thanks,
>> Peter
>>
>> >
>> > Many thx,
>> > Robert
>> >
>>
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