1 files changed, 51 insertions, 0 deletions
diff --git a/src/migration-scripts/bgp/2-to-3 b/src/migration-scripts/bgp/2-to-3
new file mode 100755
index 000000000..7ced0a3b0
--- /dev/null
+++ b/src/migration-scripts/bgp/2-to-3
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 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
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# T4257: Discussion on changing BGP autonomous system number syntax
+
+from sys import argv
+from sys import exit
+
+from vyos.configtree import ConfigTree
+
+if (len(argv) < 1):
+    print("Must specify file name!")
+    exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+config = ConfigTree(config_file)
+
+# Check if BGP is even configured. Then check if local-as exists, then add the system-as, then remove the local-as. This is for global configuration.
+if config.exists(['protocols', 'bgp']):
+    if config.exists(['protocols', 'bgp', 'local-as']):
+        config.rename(['protocols', 'bgp', 'local-as'], 'system-as')
+
+# Check if vrf names are configured. Then check if local-as exists inside of a name, then add the system-as, then remove the local-as. This is for vrf configuration.
+if config.exists(['vrf', 'name']):
+    for vrf in config.list_nodes(['vrf', 'name']):
+        if config.exists(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as']):
+            config.rename(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as'], 'system-as')
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print(f'Failed to save the modified config: {e}')
+    exit(1)