ethernet: T6306: add support for EVPN MH uplink/core tracking

When all the underlay links go down the PE no longer has access to the VxLAN
+overlay.

To prevent blackholing of traffic the server/ES links are protodowned on the PE.
A link can be setup for uplink tracking via the following configuration:

set interfaces ethernet eth0 evpn uplink

(cherry picked from commit 5565f27d15c5e7378e94aae8db8a894a12e25d7b)

1 files changed, 10 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_interfaces_ethernet.py b/smoketest/scripts/cli/test_interfaces_ethernet.py
index 8f387b23d..4843a40da 100755
--- a/smoketest/scripts/cli/test_interfaces_ethernet.py
+++ b/smoketest/scripts/cli/test_interfaces_ethernet.py
@@ -354,5 +354,15 @@ class EthernetInterfaceTest(BasicInterfaceTest.TestCase):
                 out = loads(out)
                 self.assertFalse(out[0]['autonegotiate'])
 
+    def test_ethtool_evpn_uplink_tarcking(self):
+        for interface in self._interfaces:
+            self.cli_set(self._base_path + [interface, 'evpn', 'uplink'])
+
+        self.cli_commit()
+
+        for interface in self._interfaces:
+            frrconfig = self.getFRRconfig(f'interface {interface}', daemon='zebra')
+            self.assertIn(f' evpn mh uplink', frrconfig)
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)