I think the added functionality probably outweighs the possible issues. I am in favor.
From: MICE Discuss <[log in to unmask]> On Behalf Of Richard Laager
Sent: Thursday, December 21, 2023 8:57 PM
To: [log in to unmask]
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__as from tb_rsclient {
import filter f_import_as;
table t__as;
export filter f_export_as;
+router->router_id == "206.108.255.1" ): ?>
+ add paths tx;
+
};
router->skip_md5 ): ?>
password "";
--
Richard
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