Support ASN dot notation.

inventory_provider/juniper.py

@@ -243,6 +243,36 @@ def list_interfaces(netconf_config):
                 yield u
 
 
+def asn_to_int(asn_string: str) -> int:
+    """
+    Convert a possibly dotted ASN to an integer.
+
+    Args:
+    asn_string (str): ASN to be converted, can be in dot notation or not.
+
+    Returns:
+    int: ASN in integer format.
+
+    Raises:
+    ValueError: If the ASN string is not in the expected format or exceeds valid range.
+    """
+
+    dotted_asn_pattern = re.compile(r'^(\d+)\.(\d+)$')
+    match = dotted_asn_pattern.match(asn_string)
+
+    if match:
+        high_order, low_order = map(int, match.groups())
+
+        if high_order > 0xffff or low_order > 0xffff:
+            raise ValueError(f'Invalid ASN format: {asn_string}. Both components must be <= 0xffff.')
+
+        return (high_order << 16) | low_order
+    elif asn_string.isdigit():
+        return int(asn_string)
+    else:
+        raise ValueError(f'Unable to parse ASN string: {asn_string}. Expected either a pure integer or a dot notation.')
+
+
 def _system_bgp_peers(system_node):
 
     def _peering_params(neighbor_node):
@@ -251,11 +281,11 @@ def _system_bgp_peers(system_node):
         peer_as = neighbor_node.find('peer-as')
         if peer_as is not None:
             # lxml usage warning: can't just test `if peer_as:`
-            info['remote-asn'] = int(peer_as.text)
+            info['remote-asn'] = asn_to_int(peer_as.text)
         local_as = neighbor_node.find('local-as')
         if local_as is not None:
             asn_value_node = local_as.find('as-number')
-            info['local-asn'] = int(asn_value_node.text)
+            info['local-asn'] = asn_to_int(asn_value_node.text)
         description = neighbor_node.find('description')
         if description is not None:
             # lxml usage warning: can't just test `if description:`