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+.. _topotests-markers:
+
+Markers
+--------
+
+To allow for automated selective testing on large scale continuous integration
+systems, all tests must be marked with at least one of the following markers:
+
+* babeld
+* bfdd
+* bgpd
+* eigrpd
+* isisd
+* ldpd
+* nhrpd
+* ospf6d
+* ospfd
+* pathd
+* pbrd
+* pimd
+* ripd
+* ripngd
+* sharpd
+* staticd
+* vrrpd
+
+The markers corespond to the daemon subdirectories in FRR's source code and have
+to be added to tests on a module level depending on which daemons are used
+during the test.
+
+The goal is to have continuous integration systems scan code submissions, detect
+changes to files in a daemons subdirectory and select only tests using that
+daemon to run to shorten developers waiting times for test results and save test
+infrastructure resources.
+
+Newly written modules and code changes on tests, which do not contain any or
+incorrect markers will be rejected by reviewers.
+
+
+Registering markers
+^^^^^^^^^^^^^^^^^^^
+The Registration of new markers takes place in the file
+``tests/topotests/pytest.ini``:
+
+.. code:: python3
+
+    # tests/topotests/pytest.ini
+    [pytest]
+    ...
+    markers =
+        babeld: Tests that run against BABELD
+        bfdd: Tests that run against BFDD
+        ...
+        vrrpd: Tests that run against VRRPD
+
+
+Adding markers to tests
+^^^^^^^^^^^^^^^^^^^^^^^
+Markers are added to a test by placing a global variable in the test module.
+
+Adding a single marker:
+
+.. code:: python3
+
+    import pytest
+    ...
+    
+    # add after imports, before defining classes or functions:
+    pytestmark = pytest.mark.bfdd
+    
+    ...
+    
+    def test_using_bfdd():
+
+
+Adding multiple markers:
+
+.. code:: python3
+
+    import pytest
+    ...
+    
+    # add after imports, before defining classes or functions:
+    pytestmark = [
+        pytest.mark.bgpd,
+        pytest.mark.ospfd,
+        pytest.mark.ospf6d
+    ]
+    
+    ...
+    
+    def test_using_bgpd_ospfd_ospf6d():
+
+
+Selecting marked modules for testing
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Selecting by a single marker:
+
+.. code:: bash
+
+    pytest -v -m isisd
+
+Selecting by multiple markers:
+
+.. code:: bash
+
+    pytest -v -m "isisd or ldpd or nhrpd"
+
+
+Further Information
+^^^^^^^^^^^^^^^^^^^
+The `online pytest documentation <https://docs.pytest.org/en/stable/example/markers.html>`_
+provides further information and usage examples for pytest markers.
+