lldp: T7165: add support to enable only rx or tx on specific interface

LLDP is a stateless protocol which does not necessitate sending to receive
advertisements. There are multiple scenarios such as provider peering links in
which it is advantageous to receive LLDP but not disclose internal information
to the provider.

Add new CLI command:
* set service lldp interface <name> mode [disable|rx-tx|rx|tx]

The default is unchanged and will be rx-tx.

Furthermore if an interface has an explicit LLDP disable configured under
"set service lldp interface <name> disable" this will be migrated to
"set service lldp interface <name> mode disable"

1 files changed, 48 insertions, 1 deletions

diff --git a/smoketest/scripts/cli/test_service_lldp.py b/smoketest/scripts/cli/test_service_lldp.py
index 9d72ef78f..c73707e0d 100755
--- a/smoketest/scripts/cli/test_service_lldp.py
+++ b/smoketest/scripts/cli/test_service_lldp.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2022-2024 VyOS maintainers and contributors
+# Copyright (C) 2022-2025 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -117,6 +117,8 @@ class TestServiceLLDP(VyOSUnitTestSHIM.TestCase):
         config = read_file(LLDPD_CONF)
 
         self.assertIn(f'configure ports {interface} med location elin "{elin}"', config)
+        # This is the CLI default mode
+        self.assertIn(f'configure ports {interface} lldp status rx-and-tx', config)
         self.assertIn(f'configure system interface pattern "{interface}"', config)
 
     def test_06_lldp_snmp(self):
@@ -134,5 +136,50 @@ class TestServiceLLDP(VyOSUnitTestSHIM.TestCase):
 
         self.cli_delete(['service', 'snmp'])
 
+    def test_07_lldp_interface_mode(self):
+        interfaces = Section.interfaces('ethernet', vlan=False)
+
+        # set interface mode to 'tx'
+        self.cli_set(base_path + ['interface', 'all'])
+        for interface in interfaces:
+            self.cli_set(base_path + ['interface', interface, 'mode', 'disable'])
+        # commit changes
+        self.cli_commit()
+
+        # verify configuration
+        config = read_file(LLDPD_CONF)
+        for interface in interfaces:
+            self.assertIn(f'configure ports {interface} lldp status disable', config)
+
+        # Change configuration to rx-only
+        for interface in interfaces:
+            self.cli_set(base_path + ['interface', interface, 'mode', 'rx'])
+        # commit changes
+        self.cli_commit()
+        # verify configuration
+        config = read_file(LLDPD_CONF)
+        for interface in interfaces:
+            self.assertIn(f'configure ports {interface} lldp status rx-only', config)
+
+        # Change configuration to tx-only
+        for interface in interfaces:
+            self.cli_set(base_path + ['interface', interface, 'mode', 'tx'])
+        # commit changes
+        self.cli_commit()
+        # verify configuration
+        config = read_file(LLDPD_CONF)
+        for interface in interfaces:
+            self.assertIn(f'configure ports {interface} lldp status tx-only', config)
+
+        # Change configuration to rx-only
+        for interface in interfaces:
+            self.cli_set(base_path + ['interface', interface, 'mode', 'rx-tx'])
+        # commit changes
+        self.cli_commit()
+        # verify configuration
+        config = read_file(LLDPD_CONF)
+        for interface in interfaces:
+            self.assertIn(f'configure ports {interface} lldp status rx-and-tx', config)
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)