code: def _get_vrf_name(self, ri):
          
          router_id = ri.router_name()[:self.DEV_NAME_LEN]
          is_multi_region_enabled = cfg.CONF.multi_region.enable_multi_region
  
          if is_multi_region_enabled:
              region_id = cfg.CONF.multi_region.region_id
              vrf_name = "%s-%s" % (router_id, region_id)
          else:
              vrf_name = router_id
          return vrf_name
docs: overloaded method for generating a vrf_name that supports
          region_id