diff --git a/config/main.py b/config/main.py
index 90d0f1225749..a6ac57f0cd43 100755
--- a/config/main.py
+++ b/config/main.py
@@ -110,6 +110,23 @@ def set_interface_naming_mode(mode):
     user = os.getenv('SUDO_USER')
     bashrc_ifacemode_line = "export SONIC_CLI_IFACE_MODE={}".format(mode)
 
+    # Ensure all interfaces have an 'alias' key in PORT dict
+    config_db = ConfigDBConnector()
+    config_db.connect()
+    port_dict = config_db.get_table('PORT')
+
+    if not port_dict:
+        click.echo("port_dict is None!")
+        raise click.Abort()
+
+    for port_name in port_dict.keys():
+        try:
+            if port_dict[port_name]['alias']:
+                pass
+        except KeyError:
+            click.echo("Platform does not support alias mapping")
+            raise click.Abort()
+
     if not user:
         user = os.getenv('USER')
 
diff --git a/show/main.py b/show/main.py
index 802a67f04f95..f303e4ac2e05 100755
--- a/show/main.py
+++ b/show/main.py
@@ -60,10 +60,13 @@ def __init__(self):
             raise click.Abort()
 
         for port_name in self.port_dict.keys():
-            if self.alias_max_length < len(
-                    self.port_dict[port_name]['alias']):
-               self.alias_max_length = len(
-                    self.port_dict[port_name]['alias'])
+            try:
+                if self.alias_max_length < len(
+                        self.port_dict[port_name]['alias']):
+                   self.alias_max_length = len(
+                        self.port_dict[port_name]['alias'])
+            except KeyError:
+                break
 
     def name_to_alias(self, interface_name):
         """Return vendor interface alias if SONiC