def find_rtr_namespace(self, rout_id):
if rout_id is None:<EOL><INDENT>return None<EOL><DEDENT>args = ['<STR_LIT>', '<STR_LIT>', '<STR_LIT:list>']<EOL>try:<EOL><INDENT>ns_list = utils.execute(args, root_helper=self.root_helper)<EOL><DEDENT>except Exception as exc:<EOL><INDENT>LOG.error("<STR_LIT>",<EOL>exc)<EOL>return None<EOL><DEDENT>for ns in ns_list.split():<EOL><INDENT>if '<STR_LIT>' in ns and rout_id in ns:<EOL><INDENT>return ns<EOL><DEDENT><DEDENT>
Find the namespace associated with the router.