docs: def config_mode(self, config_command="config term", pattern=""):
          """
          Enter into configuration mode on remote device.
  
          Cisco IOS devices abbreviate the prompt at 20 chars in config mode
          """
          if not pattern:
              pattern = re.escape(self.base_prompt[:16])
          return super(CiscoBaseConnection, self).config_mode(
              config_command=config_command, pattern=pattern
          )