+Advanced tags
+-------------
+
+The following list contains some tags that are less often used. They are still valid, but unless you know what you are
+doing, there is a good chance that you don't really want to use them.
+
+
+-------------------------------------------------------------------------------
+
+.. _pf_tag_bypassRoute:
+
+<bypassRoute>
+^^^^^^^^^^^^^
+
+This tag can be used to completely bypass the classical :ref:`routing algorithm <pf_route_usage>` for a pair of hosts. The
+provided list of links will be used directly, with no further routing computation. This is an advanced tag that is rarely
+used in practice.
+
+**Parent tags:** :ref:`pf_tag_zone` |br|
+**Children tags:** :ref:`pf_tag_link_ctn` |br|
+**Attributes:**
+
+:``src``: Host from which this route starts. Must be the name of an existing host.
+:``dst``: Host to which this route leads. Must be the name of an existing host.
+:``symmetrical``: Whether this route is symmetrical, ie, whether we are defining the route ``dst -> src`` at the same time.
+ Valid values: ``yes``, ``no``, ``YES``, ``NO`` (default: YES).
+
+-------------------------------------------------------------------------------
+
+.. _pf_tag_bypassZoneRoute:
+
+<bypassZoneRoute>
+^^^^^^^^^^^^^^^^^
+
+This tag can be used to completely bypass the classical :ref:`routing algorithm <pf_route_usage>` between two zones. When
+provided, it breaks the recursive search and the provided links will be used instead. This tag should probably be reserved
+to experts.
+
+**Parent tags:** :ref:`pf_tag_zone` |br|
+**Children tags:** :ref:`pf_tag_link_ctn` |br|
+**Attributes:**
+
+:``src``: Zone from which this route starts. Must be an existing zone.
+:``dst``: Zone to which this route leads. Must be an existing zone.
+:``gw_src``: Netpoint (within src zone) from which this route starts. Must be an existing host/router.
+:``gw_dst``: Netpoint (within dst zone) to which this route leads. Must be an existing host/router.
+:``symmetrical``: Whether this route is symmetrical, ie, whether we are defining the route ``dst -> src`` at the same
+ time. Valid values: ``yes``, ``no``, ``YES``, ``NO``.
+
+-------------------------------------------------------------------------------
+
+.. _pf_tag_backbone:
+
+<backbone>
+^^^^^^^^^^
+
+Within a manually-built cluster, specify the backbone to use. See the documentation of :ref:`pf_tag_cabinet` for all
+details, even if you should probably stop using this tag and switch to the C++ interface.
+
+**Parent tags:** :ref:`pf_tag_zone` with ``routing="Cluster"`` attribute |br|
+**Children tags:** none |br|
+**Attributes:**
+
+:``id``: No other link in the platform shall have the same identifier.
+:``bw``: Bandwidth, see the :ref:`pf_tag_link` for syntax/details.
+:``lat``: Latency, see the :ref:`pf_tag_link` for syntax/details.
+
+-------------------------------------------------------------------------------