We are looking at this on QCIX as well. I'll bring this up on the NA-IX forum and see what the other IXes are doing and have done and what issues have been solved or created. jay On Fri, Dec 22, 2023 at 8:00 AM Michael Hare <000000097dab80c5-dmarc-request@lists.iphouse.net> wrote:
Ack'ing this is a negotiated feature, buyer beware for those who turn it on and are using prefix-limits on their BGP sessions. I've used add-path on JunOS and on that platform you optionally add a 'path-count' function on the TX side for intra ASN stuff. In the bird implementation the behavior is "all" routes. Is there a graph or can you provide a one time count of the current RIB sizes on the RS?
I am in favor adding the feature, but I’m not sure if 1 week spacing is enough to prove stability. But I’m known to be nervous.
Bird docs mentioning the feature here: https://bird.network.cz/?get_doc&v=20&f=bird-6.html
-Michael
From: MICE Discuss <MICE-DISCUSS@LISTS.IPHOUSE.NET> On Behalf Of Jeremy Lumby Sent: Thursday, December 21, 2023 9:07 PM To: MICE-DISCUSS@LISTS.IPHOUSE.NET Subject: Re: [MICE-DISCUSS] BGP ADD-PATH capability
I think the added functionality probably outweighs the possible issues. I am in favor.
From: MICE Discuss <MICE-DISCUSS@LISTS.IPHOUSE.NET> On Behalf Of Richard Laager Sent: Thursday, December 21, 2023 8:57 PM To: MICE-DISCUSS@LISTS.IPHOUSE.NET Subject: [MICE-DISCUSS] BGP ADD-PATH capability
I propose that MICE enable BGP ADD-PATH capability (RFC 7911) on the route servers (in TX mode only). This is negotiated BGP capability, so we do not need any per-participant setting for it.
ADD-PATH is useful if the best path route is being filtered but another route would not be. We discussed adding this at a UG meeting years ago.
There are other IXPs that have this enabled. For example, this one: https://www.bcix.de/ixp/content/0/route-servers
In terms of timeline, I propose something like this:
January 9: Enable it on Route Server 1. January 16: Enable it on Route Server 2.
The actual change looks like this for the RS1-only piece, and then the conditional would be removed when we want to deploy to RS2:
--- a/roles/ixpmanager/files/mice/api/v4/router/server/bird2/neighbors.foil.php +++ b/roles/ixpmanager/files/mice/api/v4/router/server/bird2/neighbors.foil.php @@ -315,6 +315,9 @@ protocol bgp pb_<?= $int['fvliid'] ?>_as<?= $int['autsys'] ?> from tb_rsclient { import filter f_import_as<?= $int['autsys'] ?>; table t_<?= $int['fvliid'] ?>_as<?= $int['autsys'] ?>; export filter f_export_as<?= $int['autsys'] ?>; +<?php if( $t->router->router_id == "206.108.255.1" ): ?> + add paths tx; +<?php endif; ?> }; <?php if( $int['bgpmd5secret'] && !$t->router->skip_md5 ): ?> password "<?= $int['bgpmd5secret'] ?>";
--
Richard
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