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And what about multiple peering sessions with multipath routing?<br>
<br>
Cheers,<br>
Kees<br>
<br>
<div class="moz-cite-prefix">On 19-01-2021 15:17, Douglas Fischer
wrote:<br>
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<div class="gmail_default">As I mentioned initially, my focus
was on "large environments of IXPs".<br>
Considering that, L3 anycast does not apply very well to
that scenario.<br>
(I don't know any IXPs that use Route-Servers outside of the
MPLA-LAN of the IXP.)<br>
<br>
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<div class="gmail_default">Using VRRP is an excellent method
to provide fail-over on L2.<br>
(I used it a lot on several application scenarios).<br>
But it does not provide load-balancing, just fail-over.<br>
<br>
Considering "large environments of IXPs", and the fact that
even on Bird 2, the multi-thread limitation is not
completely solved.</div>
<div class="gmail_default">The solution for that is
Load-Balance. MultiBird does it VERY WELL.<br>
But until now we(at least me) have seen only "single-host"
based solutions, using nat/forwarding connections.<br>
<br>
With this suggestion, using L2 load-balancing based on
MAC-IP-Mapping manipulations, is possible to remove the
"single-host" point of failure.</div>
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<div dir="ltr" class="gmail_attr">Em ter., 19 de jan. de 2021 às
10:48, Alexander Zubkov <<a href="mailto:green@qrator.net"
moz-do-not-send="true">green@qrator.net</a>> escreveu:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
You can use VRRP or alike protocol on L2 or dynamic routing
with<br>
anycast on L3 for reliability. I do not see what you want in
Bird.<br>
Could you explain more?<br>
<br>
On Tue, Jan 19, 2021 at 1:26 PM Douglas Fischer<br>
<<a href="mailto:fischerdouglas@gmail.com" target="_blank"
moz-do-not-send="true">fischerdouglas@gmail.com</a>>
wrote:<br>
><br>
> I was studying the concepts of multi-bird for large
environments of IXPs.<br>
><br>
> And, beyond the extra complexity that it brings to the
environment, one of the weak points I saw was the fact that
all the Bird instances are at the same box(vm, container,
etc...).<br>
><br>
> A friend mentioned that some tests were made with a
LoadBalancer redirecting the post-nated connections to other
boxes.<br>
> But even in that scenario, that load balancer would be a
single-point-of-failure/bottleneck.<br>
><br>
> So I was remembering Cisco GLBP and Heart-Beat protocol.<br>
> Those protocols inform different Mac-Addresses to the
same IPv4/IPv6 Address, based on the source of the ARP/ND
query.<br>
> Making a load-balance/fail-over based on the glue between
layer2 and layer3.<br>
> P.S.: Several scenarios uses that concept. Corosync,
Windows Cluster, Orale RAC, etc...<br>
><br>
> Considering that concept, and joining it with multibird:<br>
> Would be possible to create groups of sources and
assigning different priorities to those groups on each
instance of Bird.<br>
> In this case, each Bird instance could run on a
different box, or even on a different site.<br>
><br>
> Further than that, on IXPs with a large number of
participants, would be possible to define some affinity
between that group of priority based for example on the
facility where those participants are connected.<br>
><br>
> I have a feeling that this would be especially useful for
remote peering scenarios.<br>
><br>
><br>
> Just a crazy idea to share with colleagues.<br>
> Maybe from here, some good thing could rise.<br>
><br>
><br>
> --<br>
> Douglas Fernando Fischer<br>
> Engº de Controle e Automação<br>
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-- <br>
<div dir="ltr" class="gmail_signature"><font size="2"><span
style="font-family:"courier new",monospace">Douglas
Fernando Fischer</span><br style="font-family:"courier
new",monospace">
<span style="font-family:"courier new",monospace">Engº
de Controle e Automação</span></font></div>
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