Changes for supporting install-then-advertise behavior

Functional specification:
sonic-net/SONiC#424
The routes will be pushed by BGP to Zebra to fpm to be installed
in hardware. If fpm returns error, the routes will not be sent by BGP to
its peers. Only successful routes are sent by BGP to its peers. The
feature can be enabled/disabled in BGP by a CLI. By default, the feature
is disabled. Functional specification:
sonic-net/SONiC#424
Signed-off by: Preetham Singh [email protected]
Signed-off by: Sudhanshu Kumar [email protected]

config/main.py

@@ -1055,6 +1055,37 @@ def bgp():
 def shutdown():
     """Shut down BGP session(s)"""
     pass
+@bgp.group('error-handling')
+def error_handling():
+    """Handle BGP route install errors"""
+    pass
+@error_handling.group(invoke_without_command=True)
+@click.pass_context
+def disable(ctx):
+    """Administratively Disable BGP error-handling"""
+    config_db = ConfigDBConnector(host="127.0.0.1")
+    config_db.connect()
+    curr_mode = config_db.get_entry('BGP_ERROR_CFG_TABLE', "config").get('enable')
+    if (curr_mode == "true"):
+        cmd = 'sudo vtysh -c "configure terminal" -c "no bgp error-handling enable"'
+        run_command(cmd)
+        config_db.set_entry("BGP_ERROR_CFG_TABLE", "config", {"enable":  "false"})
+    pass
+    pass
+@error_handling.group(invoke_without_command=True)
+@click.pass_context
+def enable(ctx):
+    """Administratively Enable BGP error handling"""
+    if ctx.invoked_subcommand is None:
+        config_db = ConfigDBConnector(host="127.0.0.1")
+        config_db.connect()
+        curr_mode = config_db.get_entry('BGP_ERROR_CFG_TABLE', "config").get('enable')
+        if (curr_mode != "true"):
+            cmd = 'sudo vtysh -c "configure terminal" -c "bgp error-handling enable"'
+            run_command(cmd)
+            config_db.set_entry("BGP_ERROR_CFG_TABLE", "config", {"enable":  "true"})
+        pass
+    pass
 
 # 'all' subcommand
 @shutdown.command()