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
