docs: def get_network_instances(self, name=""):
          """get_network_instances implementation for EOS."""
  
          output = self._show_vrf()
          vrfs = {}
          all_vrf_interfaces = {}
          for vrf in output:
              if (
                  vrf.get("route_distinguisher", "") == "<not set>"
                  or vrf.get("route_distinguisher", "") == "None"
              ):
                  vrf["route_distinguisher"] = ""
              else:
                  vrf["route_distinguisher"] = py23_compat.text_type(
                      vrf["route_distinguisher"]
                  )
              interfaces = {}
              for interface_raw in vrf.get("interfaces", []):
                  interface = interface_raw.split(",")
                  for line in interface:
                      if line.strip() != "":
                          interfaces[py23_compat.text_type(line.strip())] = {}
                          all_vrf_interfaces[py23_compat.text_type(line.strip())] = {}
  
              vrfs[py23_compat.text_type(vrf["name"])] = {
                  "name": py23_compat.text_type(vrf["name"]),
                  "type": "L3VRF",
                  "state": {"route_distinguisher": vrf["route_distinguisher"]},
                  "interfaces": {"interface": interfaces},
              }
          all_interfaces = self.get_interfaces_ip().keys()
          vrfs["default"] = {
              "name": "default",
              "type": "DEFAULT_INSTANCE",
              "state": {"route_distinguisher": ""},
              "interfaces": {
                  "interface": {
                      k: {} for k in all_interfaces if k not in all_vrf_interfaces.keys()
                  }
              },
          }
  
          if name:
              if name in vrfs:
                  return {py23_compat.text_type(name): vrfs[name]}
              return {}
          else:
              return vrfs