ietf-te-topology.yang 53.9 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
   module ietf-te-topology {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
     // replace with IANA namespace when assigned

     prefix "tet";

     import ietf-inet-types {
       prefix "inet";
     }

     import ietf-schedule {
       prefix "sch";
     }

     import ietf-te-types {
       prefix "te-types";
     }

     import ietf-network {
       prefix "nw";
     }

     import ietf-network-topology {
       prefix "nt";
     }

     organization
       "Traffic Engineering Architecture and Signaling (TEAS)
        Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/teas/>
        WG List:  <mailto:teas@ietf.org>

        WG Chair: Lou Berger
                  <mailto:lberger@labn.net>

        WG Chair: Vishnu Pavan Beeram
                  <mailto:vbeeram@juniper.net>

        Editor:   Xufeng Liu
                  <mailto:xliu@kuatrotech.com>

        Editor:   Igor Bryskin
                  <mailto:Igor.Bryskin@huawei.com>

        Editor:   Vishnu Pavan Beeram
                  <mailto:vbeeram@juniper.net>

        Editor:   Tarek Saad
                  <mailto:tsaad@cisco.com>

        Editor:   Himanshu Shah
                  <mailto:hshah@ciena.com>

        Editor:   Oscar Gonzalez De Dios
                  <mailto:oscar.gonzalezdedios@telefonica.com>";

     description "TE topology model";

     revision "2016-03-17" {
       description "Initial revision";
       reference "TBD";
     }

     /*
      * Features
      */

     /*feature configuration-schedule {
       description
         "This feature indicates that the system supports
          configuration scheduling.";
     }

     feature te-topology-hierarchy {
       description
         "This feature indicates that the system allows underlay
          and/or overlay TE topology hierarchy.";
     }

     feature te-performance-metric {
       description
         "This feature indicates that the system supports
          TE performance metric defined in
          RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
     }

     feature template {
       description
         "This feature indicates that the system supports
          template configuration.";
     }*/

     /*
      * Typedefs
      */
     typedef performance-metric-normality {
       type enumeration {
         enum "unknown" {
           value 0;
           description
             "Unknown.";
         }
         enum "normal" {
           value 1;
           description
             "Normal.";
         }
         enum "abnormal" {
           value 2;
           description
             "Abnormal. The anomalous bit is set.";
         }
       }
       description
         "Indicates whether a performance metric is normal, abnormal, or
          unknown.";
       reference
         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
     }

     typedef te-admin-status {
       type enumeration {
         enum up {
           description
             "Enabled.";
         }
         enum down {
           description
             "Disabled.";
         }
         enum testing {
           description
             "In some test mode.";
         }
         enum preparing-maintenance {
           description
             "Resource is disabled in the control plane to prepare for
              graceful shutdown for maintenance purposes.";
           reference
             "RFC5817: Graceful Shutdown in MPLS and Generalized MPLS
              Traffic Engineering Networks";
         }
         enum maintenance {
           description
             "Resource is disabled in the data plane for maintenance
              purposes.";
         }
       }
       description
         "Defines a type representing the administrative status of
          a TE resource.";
     }
     typedef te-global-id {
       type uint32;
       description
         "An identifier to uniquely identify an operator, which can be
          either a provider or a client.
          The definition of this type is taken from RFC6370 and RFC5003.
          This attribute type is used solely to provide a globally
          unique context for TE topologies.";
     }

     typedef te-link-access-type {
       type enumeration {
         enum point-to-point {
           description
             "The link is point-to-point.";
         }
         enum multi-access {
           description
             "The link is multi-access, including broacast and NBMA.";
         }
       }
       description
         "Defines a type representing the access type of a TE link.";
       reference
         "RFC3630: Traffic Engineering (TE) Extensions to OSPF
          Version 2.";
     }

     typedef te-node-id {
       type inet:ip-address;
       description
         "An identifier for a node in a topology.
          The identifier is represented as an IPv4 or IPv6 address.
          This attribute is mapped to Router ID in
          RFC3630, RFC5329, RFC5305, and RFC 6119.";
     }

     typedef te-oper-status {
       type enumeration {
         enum up {
           description
           "Operational up.";
         }
         enum down {
           description
           "Operational down.";
         }
         enum testing {
           description
           "In some test mode.";
         }
         enum unknown {
           description
           "Status cannot be determined for some reason.";
         }
         enum preparing-maintenance {
           description
             "Resource is disabled in the control plane to prepare for
              graceful shutdown for maintenance purposes.";
           reference
             "RFC5817: Graceful Shutdown in MPLS and Generalized MPLS
              Traffic Engineering Networks";
         }
         enum maintenance {
           description
             "Resource is disabled in the data plane for maintenance
              purposes.";
         }
       }
       description
         "Defines a type representing the operational status of
          a TE resource.";
     }

     typedef te-recovery-status {
       type enumeration {
         enum normal {
           description
             "Both the recovery and working spans are fully
              allocated and active, data traffic is being
              transported over (or selected from) the working
              span, and no trigger events are reported.";
         }
         enum recovery-started {
           description
             "The recovery action has been started, but not completed.";
         }
         enum recovery-succeeded {
           description
             "The recovery action has succeeded. The working span has
              reported a failure/degrade condition and the user traffic
              is being transported (or selected) on the recovery span.";
         }
         enum recovery-failed {
           description
             "The recovery action has failed.";
         }
         enum reversion-started {
           description
             "The reversion has started.";
         }
         enum reversion-failed {
           description
             "The reversion has failed.";
         }
         enum recovery-unavailable {
           description
             "The recovery is unavailable -- either as a result of an
              operator Lockout command or a failure condition detected
              on the recovery span.";
         }
         enum recovery-admin {
           description
             "The operator has issued a command switching the user
              traffic to the recovery span.";
         }
         enum wait-to-restore {
           description
             "The recovery domain is recovering from a failuer/degrade
              condition on the working span that is being controlled by
              the Wait-to-Restore (WTR) timer.";
         }
       }
       description
         "Defines the status of a recovery action.";
       reference
         "RFC4427: Recovery (Protection and Restoration) Terminology
          for Generalized Multi-Protocol Label Switching (GMPLS).
          RFC6378: MPLS Transport Profile (MPLS-TP) Linear Protection";
     }

     typedef te-template-name {
       type string {
         pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
       }
       description
         "A type for the name of a TE node template or TE link
          template.";
     }

     typedef te-topology-event-type {
       type enumeration {
         enum "add" {
           value 0;
           description
             "A TE node or te-link has been added.";
         }
         enum "remove" {
           value 1;
           description
             "A TE node or te-link has been removed.";
         }
         enum "update" {
           value 2;
           description
             "A TE node or te-link has been updated.";
         }
       }
       description "TE  Event type for notifications";
     } // te-topology-event-type
     typedef te-topology-id {
       type string {
         pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
       }
       description
         "An identifier for a topology.";
     }

     typedef te-tp-id {
       type union {
         type uint32;          // Unnumbered
         type inet:ip-address; // IPv4 or IPv6 address
       }
       description
         "An identifier for a TE link endpoint on a node.
          This attribute is mapped to local or remote link identifier in
          RFC3630 and RFC5305.";
     }

     /*
      * Identities
      */

     /*
      * Groupings
      */
     grouping information-source-attributes {
       description
         "The attributes identifying source that has provided the
          related information, and the source credibility.";
       leaf information-source {
         type enumeration {
           enum "unknown" {
             description "The source is unknown.";
           }
           enum "locally-configured" {
             description "Configured entity.";
           }
           enum "ospfv2" {
             description "OSPFv2.";
           }
           enum "ospfv3" {
             description "OSPFv3.";
           }
           enum "isis" {
             description "ISIS.";
           }
           enum "system-processed" {
             description "System processed entity.";
           }
           enum "other" {
             description "Other source.";
           }
         }
         description
           "Indicates the source of the information.";
       }
       container information-source-state {
         description
           "The container contains state attributes related to
            the information source.";
         leaf credibility-preference {
           type uint16;
           description
             "The preference value to calculate the traffic
              engineering database credibility value used for
              tie-break selection between different
              information-source values.
              Higher value is more preferable.";
         }
         container topology {
           description
             "When the information is processed by the system,
              the attributes in this container indicate which topology
              is used to process to generate the result information.";
           uses te-topology-ref;
         } // topology
         leaf routing-instance {
           type string;
           description
             "When applicable, this is the name of a routing instance
              from which the information is learned.";
         } // routing-information
       }
     } // information-source-attributes

     grouping performance-metric-attributes {
       description
         "Link performance information in real time.";
       reference
         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
       leaf unidirectional-delay {
         type uint32 {
           range 0..16777215;
         }
         description "Delay or latency in micro seconds.";
       }
       leaf unidirectional-min-delay {
         type uint32 {
           range 0..16777215;
         }
         description "Minimum delay or latency in micro seconds.";
       }
       leaf unidirectional-max-delay {
         type uint32 {
           range 0..16777215;
         }
         description "Maximum delay or latency in micro seconds.";
       }
       leaf unidirectional-delay-variation {
         type uint32 {
           range 0..16777215;
         }
         description "Delay variation in micro seconds.";
       }
       leaf unidirectional-packet-loss {
         type decimal64 {
           /*fraction-digits 6;
           range "0 .. 50.331642";*/
         }
         description
           "Packet loss as a percentage of the total traffic sent
            over a configurable interval. The finest precision is
            0.000003%.";
       }
       leaf unidirectional-residual-bandwidth {
         type decimal64 {
           /*fraction-digits 2;*/
         }
         description
           "Residual bandwidth that subtracts tunnel
            reservations from Maximum Bandwidth (or link capacity)
            [RFC3630] and provides an aggregated remainder across QoS
            classes.";
       }
       leaf unidirectional-available-bandwidth {
         type decimal64 {
           /*fraction-digits 2;*/
         }
         description
           "Available bandwidth that is defined to be residual
            bandwidth minus the measured bandwidth used for the
            actual forwarding of non-RSVP-TE LSP packets.  For a
            bundled link, available bandwidth is defined to be the
            sum of the component link available bandwidths.";
       }
       leaf unidirectional-utilized-bandwidth {
         type decimal64 {
           /*fraction-digits 2;*/
         }
         description
           "Bandwidth utilization that represents the actual
            utilization of the link (i.e. as measured in the router).
            For a bundled link, bandwidth utilization is defined to
            be the sum of the component link bandwidth
            utilizations.";
       }
     } // performance-metric-attributes
     grouping performance-metric-normality-attributes {
       description
         "Link performance metric normality attributes.";
       reference
         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
       leaf unidirectional-delay {
         type performance-metric-normality;
         description "Delay normality.";
       }
       leaf unidirectional-min-delay {
         type performance-metric-normality;
         description "Minimum delay or latency normality.";
       }
       leaf unidirectional-max-delay {
         type performance-metric-normality;
         description "Maximum delay or latency normality.";
       }
       leaf unidirectional-delay-variation {
         type performance-metric-normality;
         description "Delay variation normality.";
       }
       leaf unidirectional-packet-loss {
         type performance-metric-normality;
         description "Packet loss normality.";
       }
       leaf unidirectional-residual-bandwidth {
         type performance-metric-normality;
         description "Residual bandwidth normality.";
       }
       leaf unidirectional-available-bandwidth {
         type performance-metric-normality;
         description "Available bandwidth normality.";
       }
       leaf unidirectional-utilized-bandwidth {
         type performance-metric-normality;
         description "Bandwidth utilization normality.";
       }
     } // performance-metric-normality-attributes

     grouping performance-metric-throttle-container {
       description
         "A container controlling performance metric throttle.";
       container performance-metric-throttle {
         if-feature te-performance-metric;
         /*must "suppression-interval >= measure-interval" {
           error-message
             "suppression-interval cannot be less then
              measure-interval.";
           description
             "Constraint on suppression-interval and
              measure-interval.";
         }*/
         description
           "Link performance information in real time.";
         reference
           "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
         leaf unidirectional-delay-offset {
           type uint32 {
             range 0..16777215;
           }
           description
             "Offset value to be added to the measured delay value.";
         }
         leaf measure-interval {
           type uint32;
           default 30;
           description
             "Interval in seconds to measure the extended metric
              values.";
         }
         leaf advertisement-interval {
           type uint32;
           description
             "Interval in seconds to advertise the extended metric
              values.";
         }
         leaf suppression-interval {
           type uint32 {
             range "1..max";
           }
           default 120;
           description
             "Interval in seconds to suppress advertising the extended
              metric values.";
         }
         container threshold-out {
           uses performance-metric-attributes;
           description
             "If the measured parameter falls outside an upper bound
              for all but the min delay metric (or lower bound for
              min-delay metric only) and the advertised value is not
              already outside that bound, anomalous announcement will be
              triggered.";
         }
         container threshold-in {
           uses performance-metric-attributes;
           description
             "If the measured parameter falls inside an upper bound
              for all but the min delay metric (or lower bound for
              min-delay metric only) and the advertised value is not
              already inside that bound, normal (anomalous-flag cleared)
              announcement will be triggered.";
         }
         container threshold-accelerated-advertisement {
           description
             "When the difference between the last advertised value and
              current measured value exceed this threshold, anomalous
              announcement will be triggered.";
           uses performance-metric-attributes;
         }
       }
     } // performance-metric-throttle-container

     grouping te-link-augment {
       description
         "Augmentation for TE link.";

       container te {
         presence "TE support.";
         description
           "Indicates TE support.";

         container config {
           description
             "Configuration data.";
           uses te-link-config;
         } // config
         container state {
           config false;
           description
             "Operational state data.";
           uses te-link-config;
           uses te-link-state-derived;
         } // state
       } // te
     } // te-link-augment

     grouping te-link-config {
       description
         "TE link configuration grouping.";
       choice bundle-stack-level {
         description
           "The TE link can be partitioned into bundled
            links, or component links.";
         case bundle {
           container bundled-links {
             description
               "A set of bundled links.";
             reference
               "RFC4201: Link Bundling in MPLS Traffic Engineering
               (TE).";
             list bundled-link {
               key "sequence";
               description
                 "Specify a bundled interface that is
                  further partitioned.";
               leaf sequence {
                 type uint32;
                 description
                   "Identify the sequence in the bundle.";
               }
               leaf src-tp-ref {
                 type nt:tp-id;
                 description
                   "Reference to another TE termination point on the
                    same souruce node.";
               }
               leaf des-tp-ref {
                 type nt:tp-id;
                 description
                   "Reference to another TE termination point on the
                    same destination node.";
               }
             } // list bundled-link
           }
         }
         case component {
           container component-links {
             description
               "A set of component links";
             list component-link {
               key "sequence";
               description
                 "Specify a component interface that is
                  sufficient to unambiguously identify the
                  appropriate resources";

               leaf sequence {
                 type uint32;
                 description
                   "Identify the sequence in the bundle.";
               }
               leaf src-interface-ref {
                 type string;
                 description
                   "Reference to component link interface on the
                    source node.";
               }
               leaf des-interface-ref {
                 type string;
                 description
                   "Reference to component link interface on the
                    destinatioin node.";
               }
             }
           }
         }
       } // bundle-stack-level

       leaf-list te-link-template {
         if-feature template;
         type te-template-name;
         description
           "The reference to a TE link template.";
       }
       uses te-link-config-attributes;
     } // te-link-config

     grouping te-link-config-attributes {
       description
         "Link configuration attributes in a TE topology.";
       container te-link-attributes {
         description "Link attributes in a TE topology.";
         uses sch:schedules;
         leaf access-type {
           type te-link-access-type;
           description
             "Link access type, which can be point-to-point or
              multi-access.";
         }
         leaf is-abstract {
           type empty;
           description "Present if the link is abstract.";
         }
         leaf name {
           type string;
           description "Link Name.";
         }
         container underlay {
           if-feature te-topology-hierarchy;
           presence
             "Indicates the underlay exists for this link.";
           description "Attributes of the te-link underlay.";
           reference
             "RFC4206: Label Switched Paths (LSP) Hierarchy with
              Generalized Multi-Protocol Label Switching (GMPLS)
              Traffic Engineering (TE)";

           uses te-link-underlay-attributes;
         } // underlay
         leaf admin-status {
           type te-admin-status;
           description
             "The administrative state of the link.";
         }

         uses performance-metric-throttle-container;
         uses te-link-info-attributes;
       } // te-link-attributes
     } // te-link-config-attributes

     grouping te-link-info-attributes {
       description
         "Advertised TE information attributes.";
       leaf link-index {
         type uint64;
         description
           "The link identifier.  If OSPF is used, this represents an
            ospfLsdbID.  If IS-IS is used, this represents an isisLSPID.
            If a locally configured link is used, this object represents
            a unique value, which is locally defined in a router.";
       }
       leaf administrative-group {
         type te-types:admin-groups;
         description
           "Administrative group or color of the link.
            This attribute covers both administrative group (defined in
            RFC3630, RFC5329, and RFC5305), and extended administrative
            group (defined in RFC7308).";
       }
       leaf max-link-bandwidth {
         type decimal64 {
           /*fraction-digits 2;*/
         }
         description
           "Maximum bandwidth that can be seen on this link in this
            direction. Units in bytes per second.";
         reference
           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
            Version 2.
            RFC5305: IS-IS Extensions for Traffic Engineering.";
       }
       leaf max-resv-link-bandwidth {
         type decimal64 {
           /*fraction-digits 2;*/
         }
         description
           "Maximum amount of bandwidth that can be reserved in this
            direction in this link. Units in bytes per second.";
         reference
           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
            Version 2.
            RFC5305: IS-IS Extensions for Traffic Engineering.";
       }
       list unreserved-bandwidth {
         key "priority";
         max-elements "8";
         description
           "Unreserved bandwidth for 0-7 priority levels. Units in
            bytes per second.";
         reference
           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
            Version 2.
            RFC5305: IS-IS Extensions for Traffic Engineering.";
         leaf priority {
           type uint8 {
             range "0..7";
           }
           description "Priority.";
         }
         leaf bandwidth {
           type decimal64 {
             /*fraction-digits 2;*/
           }
           description
             "Unreserved bandwidth for this level.";
         }
       }
       leaf te-default-metric {
         type uint32;
         description
           "Traffic Engineering Metric.";
       }
       container performance-metric {
         if-feature te-performance-metric;
         description
           "Link performance information in real time.";
         reference
           "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
         container measurement {
           description
             "Measured performance metric values. Static configuration
              and manual overrides of these measurements are also
              allowed.";
           uses performance-metric-attributes;
         }
         container normality
         {
           description
             "Performance metric normality values.";
           uses performance-metric-normality-attributes;
         }
       }
       leaf link-protection-type {
         type enumeration {
           enum "unprotected" {
             description "Unprotected.";
           }
           enum "extra-traffic" {
             description "Extra traffic.";
           }
           enum "shared" {
             description "Shared.";
           }
           enum "1-for-1" {
             description "One for one protection.";
           }
           enum "1-plus-1" {
             description "One plus one protection.";
           }
           enum "enhanced" {
             description "Enhanced protection.";
           }
         }
         description
           "Link Protection Type desired for this link.";
         reference
           "RFC4202: Routing Extensions in Support of
            Generalized Multi-Protocol Label Switching (GMPLS).";
       }
       list interface-switching-capability {
         key "switching-capability";
         description
           "List of Interface Switching Capabilities Descriptors (ISCD)
            for this link.";
         reference
           "RFC3471: Generalized Multi-Protocol Label Switching (GMPLS)
            Signaling Functional Description.
            RFC4203: OSPF Extensions in Support of Generalized
            Multi-Protocol Label Switching (GMPLS).";
         leaf switching-capability {
           type string;
           description
             "Switching Capability for this interface.";
         }
         leaf encoding {
           type string;
           description
             "Encoding supported by this interface.";
         }
         list max-lsp-bandwidth {
           key "priority";
           max-elements "8";
           description
             "Maximum LSP Bandwidth at priorities 0-7.";
           leaf priority {
             type uint8 {
               range "0..7";
             }
             description "Priority.";
           }
           leaf bandwidth {
             type decimal64 {
               /*fraction-digits 2;*/
             }
             description
               "Max LSP Bandwidth for this level";
           }
         }
         container time-division-multiplex-capable {
           when "../switching-capability = 'TDM'" {
             description "Valid only for TDM";
           }
           description
             "Interface has time-division multiplex capabilities.";

           leaf minimum-lsp-bandwidth {
             type decimal64 {
               /*fraction-digits 2;*/
             }
             description
               "Minimum LSP Bandwidth. Units in bytes per second.";
           }
           leaf indication {
             type enumeration {
               enum "standard" {
                 description
                   "Indicates support of standard SONET/SDH.";
               }
               enum "arbitrary" {
                 description
                   "Indicates support of arbitrary SONET/SDH.";
               }
             }
             description
               "Indication whether the interface supports Standard or
                Arbitrary SONET/SDH";
           }
         }
         list interface-adjustment-capability {
           key "upper-sc";
           description
             "List of Interface Adjustment Capability Descriptors (IACD)
              for this link.";
           reference
             "RFC6001: Generalized MPLS (GMPLS) Protocol Extensions
              for Multi-Layer and Multi-Region Networks (MLN/MRN).";
           leaf upper-sc {
             type string;
             description
               "Switching Capability for this interface.";
           }
           leaf upper-encoding {
             type string;
             description
               "Encoding supported by this interface.";
           }
           list max-lsp-bandwidth {
             key "priority";
             max-elements "8";
             description
               "Maximum LSP Bandwidth at priorities 0-7.";
             leaf priority {
               type uint8 {
                 range "0..7";
               }
               description "Priority.";
             }
             leaf bandwidth {
               type decimal64 {
                 /*fraction-digits 2;*/
               }
               description
                 "Max LSP Bandwidth for this level.";
             }
           }
         } // interface-adjustment-capability
       } // interface-switching-capability
       container te-srlgs {
         description
           "A list of SLRGs.";
         leaf-list values {
           type te-types:srlg;
           description "SRLG value.";
           reference
             "RFC4202: Routing Extensions in Support of
              Generalized Multi-Protocol Label Switching (GMPLS).";
         }
       }
     } // te-link-info-attributes

     grouping te-link-state-derived {
       description
         "Link state attributes in a TE topology.";
       leaf oper-status {
         type te-oper-status;
         description
           "The current operational state of the link.";
       }
       uses information-source-attributes;
       list alt-information-sources {
         key "information-source";
         description
           "A list of information sources learned but not used.";
         uses information-source-attributes;
         uses te-link-info-attributes;
       }
       container recovery {
         description
           "Status of the recovery process.";
         leaf restoration-status {
           type te-recovery-status;
           description
             "Restoration status.";
         }
         leaf protection-status {
           type te-recovery-status;
           description
             "Protection status.";
         }
       }
       container underlay {
         if-feature te-topology-hierarchy;
         description "State attributes for te-link underlay.";
         uses te-link-state-underlay-attributes;
       }
     } // te-link-state-derived
     grouping te-link-state-underlay-attributes {
       description "State attributes for te-link underlay.";
       leaf dynamic {
         type boolean;
         description
           "true if the underlay is dynamically created.";
       }
       leaf committed {
         type boolean;
         description
           "true if the underlay is committed.";
       }
     } // te-link-state-underlay-attributes

     grouping te-link-underlay-attributes {
       description "Attributes for  te-link underlay.";
       reference
         "RFC4206: Label Switched Paths (LSP) Hierarchy with
          Generalized Multi-Protocol Label Switching (GMPLS)
          Traffic Engineering (TE)";
       container underlay-primary-path {
         description
           "The service path on the underlay topology that
            supports this link.";
         uses te-topology-ref;
         list path-element {
           key "path-element-id";
           description
             "A list of path elements describing the service path.";
           leaf path-element-id {
             type uint32;
             description "To identify the element in a path.";
           }
           uses te-path-element;
         }
       } // underlay-primary-path
       list underlay-backup-path {
         key "index";
         description
           "A list of backup service paths on the underlay topology that
            protect the underlay primary path. If the primary path is
            not protected, the list contains zero elements. If the
            primary path is protected, the list contains one or more
            elements.";
         leaf index {
           type uint32;
           description
             "A sequence number to identify a backup path.";
         }
         uses te-topology-ref;
         list path-element {
           key "path-element-id";
           description
             "A list of path elements describing the backup service
              path";
           leaf path-element-id {
             type uint32;
             description "To identify the element in a path.";
           }
           uses te-path-element;
         }
       } // underlay-backup-path
       leaf underlay-protection-type {
         type uint16;
         description
           "Underlay protection type desired for this link";
       }
       container underlay-trail-src {
         uses nt:tp-ref;
         description
           "Source TE link of the underlay trail.";
       }
       container underlay-trail-des {
         uses nt:tp-ref;
         description
           "Destination TE link of the underlay trail.";
       }
     } // te-link-underlay-attributes

     grouping te-node-augment {
       description
         "Augmentation for TE node.";

       container te {
         presence "TE support.";
         description
           "Indicates TE support.";

         leaf te-node-id {
           type te-node-id;
           mandatory true;
           description
             "The identifier of a node in the TE topology.
              A node is specific to a topology to which it belongs.";
         }

         container config {
           description
             "Configuration data.";
           uses te-node-config;
         } // config
         container state {
           config false;
           description
             "Operational state data.";

           uses te-node-config;
           uses te-node-state-derived;
         } // state

         list tunnel-termination-point {
           key "tunnel-tp-id";
           description
             "A termination point can terminate a tunnel.";
           leaf tunnel-tp-id {
             type binary;
             description
               "Tunnel termination point identifier.";
           }
           container config {
             description
               "Configuration data.";
             uses te-node-tunnel-termination-capability;
           }

           container state {
             config false;
             description
               "Operational state data.";

             uses te-node-tunnel-termination-capability;
             leaf switching-capability {
               type string;
               mandatory true;
               description
                 "Switching Capability.";
             }
             leaf encoding {
               type string;
               mandatory true;
               description
                 "Encoding type.";
             }
           } // state

         } // tunnel-termination-point
       } // te
     } // te-node-augment

     grouping te-node-config {
       description "TE node configuration grouping.";

       leaf-list te-node-template {
         if-feature template;
         type te-template-name;
         description
           "The reference to a TE node template.";
       }
       uses te-node-config-attributes;
     } // te-node-config

     grouping te-node-config-attributes {
       description "Configuration node attributes in a TE topology.";
       container te-node-attributes {
         description "Containing node attributes in a TE topology.";
         uses sch:schedules;
         leaf admin-status {
           type te-admin-status;
           description
             "The administrative state of the link.";
         }
         uses te-node-connectivity-matrix;
         uses te-node-info-attributes;
       } // te-node-attributes
     } // te-node-config-attributes

     grouping te-node-config-attributes-notification {
       description
         "Configuration node attributes for template in a TE topology.";
       container te-node-attributes {
         description "Containing node attributes in a TE topology.";
         uses sch:schedules;
         leaf admin-status {
           type te-admin-status;
           description
             "The administrative state of the link.";
         }
         uses te-node-connectivity-matrix-abs;
         uses te-node-info-attributes;
       } // te-node-attributes
     } // te-node-config-attributes-notification

     grouping te-node-config-attributes-template {
       description
         "Configuration node attributes for template in a TE topology.";
       container te-node-attributes {
         description "Containing node attributes in a TE topology.";
         uses sch:schedules;
         leaf admin-status {
           type te-admin-status;
           description
             "The administrative state of the link.";
         }
         uses te-node-info-attributes;
       } // te-node-attributes
     } // te-node-config-attributes-template

     grouping te-node-connectivity-matrix {
       description "Connectivity matrix on a TE node.";
       list connectivity-matrix {
         key "id";
         description
           "Represents node's switching limitations, i.e. limitations
            in interconnecting network TE links across the node.";
         reference
           "RFC7579: General Network Element Constraint Encoding
            for GMPLS-Controlled Networks.";
         leaf id {
           type uint32;
           description "Identifies the connectivity-matrix entry.";
         }
         container from {
           leaf tp-ref {
             type nt:tp-id;
             description
               "Relative reference to source termination point.";
           }
           description
             "Reference to source NTP.";
         }
         container to {
           leaf tp-ref {
             type nt:tp-id;
             description
               "Relative reference to destination termination point.";
           }
           description
             "Reference to destination NTP.";
         }
         leaf is-allowed {
           type boolean;
           description
             "true  - switching is allowed,
              false - switching is disallowed.";
         }
       }
     } // te-node-connectivity-matrix

     grouping te-node-connectivity-matrix-abs {
       description
         "Connectivity matrix on a TE node, using absolute
          paths to reference termination points.";
       list connectivity-matrix {
         key "id";
         description
           "Represents node's switching limitations, i.e. limitations
            in interconnecting network TE links across the node.";
         reference
           "RFC7579: General Network Element Constraint Encoding
            for GMPLS-Controlled Networks.";
         leaf id {
           type uint32;
           description "Identifies the connectivity-matrix entry.";
         }
         container from {
           uses nt:tp-ref;
           description
             "Reference to source NTP.";
         }
         container to {
           uses nt:tp-ref;
           description
             "Reference to destination NTP.";
         }
         leaf is-allowed {
           type boolean;
           description
             "true  - switching is allowed,
              false - switching is disallowed.";
         }
       }
     } // te-node-connectivity-matrix-abs

     grouping te-node-info-attributes {
       description
         "Advertised TE information attributes.";
       leaf domain-id {
         type uint32;
         description
           "Identifies the domain that this node belongs.
            This attribute is used to support inter-domain links.";
         reference
           "RFC5152: A Per-Domain Path Computation Method for
            Establishing Inter-Domain Traffic Engineering (TE)
            Label Switched Paths (LSPs).
            RFC5392: OSPF Extensions in Support of Inter-Autonomous
            System (AS) MPLS and GMPLS Traffic Engineering.
            RFC5316: ISIS Extensions in Support of Inter-Autonomous
            System (AS) MPLS and GMPLS Traffic Engineering.";
       }
       leaf is-abstract {
         type empty;
         description
           "Present if the node is abstract, not present if the node
            is actual.";
       }
       leaf name {
         type inet:domain-name;
         description "Node name.";
       }
       leaf-list signaling-address {
         type inet:ip-address;
         description "Node signaling address.";
       }
       container underlay-topology {
         if-feature te-topology-hierarchy;
         description
           "When an abstract node encapsulates a topology,
            the attributes in this container point to said topology.";
         uses te-topology-ref;
       }
     } // te-node-info-attributes

     grouping te-node-state-derived {
       description "Node state attributes in a TE topology.";
       leaf oper-status {
         type te-oper-status;
         description
           "The current operational state of the node.";
       }
       leaf is-multi-access-dr {
         type empty;
         description
           "The presence of this attribute indicates that this TE node
            is a pseudonode elected as a designated router.";
         reference
           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
            Version 2.
            RFC1195: Use of OSI IS-IS for Routing in TCP/IP and Dual
            Environments.";
       }
       uses information-source-attributes;
       list alt-information-sources {
         key "information-source";
         description
           "A list of information sources learned but not used.";
         uses information-source-attributes;
         uses te-node-connectivity-matrix;
         uses te-node-info-attributes;
       }
     } // te-node-state-derived

     grouping te-node-state-derived-notification {
       description "Node state attributes in a TE topology.";
       leaf oper-status {
         type te-oper-status;
         description
           "The current operational state of the node.";
       }
       leaf is-multi-access-dr {
         type empty;
         description
           "The presence of this attribute indicates that this TE node
            is a pseudonode elected as a designated router.";
         reference
           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
            Version 2.
            RFC1195: Use of OSI IS-IS for Routing in TCP/IP and Dual
            Environments.";
       }
       uses information-source-attributes;
       list alt-information-sources {
         key "information-source";
         description
           "A list of information sources learned but not used.";
         uses information-source-attributes;
         uses te-node-connectivity-matrix-abs;
         uses te-node-info-attributes;
       }
     } // te-node-state-derived-notification

     grouping te-node-tunnel-termination-capability {
       description
         "Termination capability of a tunnel termination point on a
          TE node.";

       list termination-capability {
         key "link-tp";
         description
           "The termination capabilities between
            tunnel-termination-point and link termination-point.
            The capability information can be used to compute
            the tunnel path.";
         leaf link-tp {
           type nt:tp-id;
           description
             "Link termination point.";
         }
       } // termination-capability
     } // te-node-tunnel-termination-capability

     grouping te-path-element {
       description
         "A group of attributes defining an element in a TE path
          such as TE node, TE link, TE atomic resource or label.";
       uses te-types:explicit-route-subobject;
     } // te-path-element

     grouping te-termination-point-augment {
       description
         "Augmentation for TE termination point.";

       container te {
         presence "TE support.";
         description
           "Indicates TE support.";

         leaf te-tp-id {
           type te-tp-id;
           mandatory true;
           description
             "An identifier to uniquely identify a TE termination
              point.";
         }

         container config {
           description
             "Configuration data.";
           uses te-termination-point-config;
         } // config
         container state {
           config false;
           description
             "Operational state data.";
           uses te-termination-point-config;
         } // state
       } // te
     } // te-termination-point-augment

     grouping te-termination-point-config {
       description
         "TE termination point configuration grouping.";
       uses sch:schedules;
     } // te-termination-point-config

     grouping te-topologies-augment {
       description
         "Augmentation for TE topologies.";

       container te {
         presence "TE support.";
         description
           "Indicates TE support.";

         container templates {
           description
             "Configuration parameters for templates used for TE
              topology.";

           list node-template {
             if-feature template;
             key "name";
             leaf name {
               type te-template-name;
               description
                 "The name to identify a TE node template.";
             }
             description
               "The list of TE node templates used to define sharable
                and reusable TE node attributes.";
             uses template-attributes;
             uses te-node-config-attributes-template;
           } // node-template

           list link-template {
             if-feature template;
             key "name";
             leaf name {
               type te-template-name;
               description
                 "The name to identify a TE link template.";
             }
             description
               "The list of TE link templates used to define sharable
                and reusable TE link attributes.";
             uses template-attributes;
             uses te-link-config-attributes;
           } // link-template
         } // templates
       } // te
     } // te-topologies-augment

     grouping te-topology-augment {
       description
         "Augmentation for TE topology.";

       container te {
         presence "TE support.";
         description
           "Indicates TE support.";

         leaf provider-id {
           type te-global-id;
           mandatory true;
           description
             "An identifier to uniquely identify a provider.";
         }
         leaf client-id {
           type te-global-id;
           mandatory true;
           description
             "An identifier to uniquely identify a client.";
         }
         leaf te-topology-id {
           type te-topology-id;
           mandatory true;
           description
             "It is presumed that a datastore will contain many
              topologies. To distinguish between topologies it is
              vital to have UNIQUE topology identifiers.";
         }

         container config {
           description
             "Configuration data.";
           uses te-topology-config;
         } // config
         container state {
           config false;
           description
             "Operational state data.";
           uses te-topology-config;
         } // state
       } // te
     } // te-topology-augment

     grouping te-topology-config {
       description
         "TE topology configuration grouping.";
       uses sch:schedules;
       leaf preference {
         type uint8 {
           range "1..255";
         }
         description
           "Specifies a preference for this topology. A lower number
            indicates a higher preference.";
       }
     } // te-topology-config

     grouping te-topology-ref {
       description
         "References a TE topology.";
       leaf provider-id-ref {
         type te-global-id;
         description
           "A reference to a provider-id.";
       }
       leaf client-id-ref {
         type te-global-id;
         description
           "A reference to a client-id.";
       }
       leaf te-topology-id-ref {
         type tet:te-topology-id;
         description
           "A reference to a te-topology-id.";
       }
       leaf network-id-ref {
         type nw:network-id;
         description
           "A reference to a network-id in base ietf-network module.";
       }
     } // te-topology-ref

     grouping te-topology-type {
       description
         "Identifies the TE topology type.";
       container te-topology {
         presence "Indicates TE topology.";
         description
           "Its presence identifies the TE topology type.";
       }
     } // te-topology-type

     grouping template-attributes {
       description
         "Common attributes for all templates.";

       leaf priority {
         type uint16;
         description
           "The preference value to resolve conflicts between different
            templates. When two or more templates specify values for
            one configuration attribute, the value from the template
            with the highest priority is used.";
       }
       leaf reference-change-policy {
         type enumeration {
           enum no-action {
             description
               "When an attribute changes in this template, the
                configuration node referring to this template does
                not take any action.";
           }
           enum not-allowed {
             description
               "When any configuration object has a reference to this
                template, changing this template is not allowed.";
           }
           enum cascade {
             description
               "When an attribute changes in this template, the
                configuration object referring to this template applies
                the new attribute value to the corresponding
                configuration.";
           }
         }
         description
           "This attribute specifies the action taken to a configuration
            node that has a reference to this template.";
       }
     } // template-attributes

     /*
      * Configuration data nodes
      */
     augment "/nw:networks/nw:network/nw:network-types" {
       description
         "Introduce new network type for TE topology.";
       uses te-topology-type;
     }

     augment "/nw:networks" {
       description
         "Augmentation parameters for TE topologies.";
       uses te-topologies-augment;
     }

     augment "/nw:networks/nw:network" {
       when "nw:network-types/te-topology" {
         description
           "Augmentation parameters apply only for networks with
            TE topology type.";
       }
       description
         "Configuration parameters for TE topology.";
       uses te-topology-augment;
     }

     augment "/nw:networks/nw:network/nw:node" {
       when "../nw:network-types/te-topology" {
         description
           "Augmentation parameters apply only for networks with
            TE topology type.";
       }
       description
         "Configuration parameters for TE at node level.";
       uses te-node-augment;
     }

     augment "/nw:networks/nw:network/nt:link" {
       when "../nw:network-types/te-topology" {
         description
           "Augmentation parameters apply only for networks with
            TE topology type.";
       }
       description
         "Configuration parameters for TE at link level";
       uses te-link-augment;
     }

     augment "/nw:networks/nw:network/nw:node/"
           + "nt:termination-point" {
       when "../../nw:network-types/te-topology" {
         description
           "Augmentation parameters apply only for networks with
            TE topology type.";
       }
       description
         "Configuration parameters for TE at termination point level";
       uses te-termination-point-augment;
     }

     /*
      * Operational state data nodes
      */

     /*
      * Notifications
      */
     notification te-node-event {
       description "Notification event for TE node.";
       leaf event-type {
         type te-topology-event-type;
         description "Event type.";
       }
       uses nw:node-ref;
       uses te-topology-type;
       uses tet:te-node-config-attributes-notification;
       uses tet:te-node-state-derived-notification;
     }

     notification te-link-event {
       description "Notification event for TE link.";
       leaf event-type {
         type te-topology-event-type;
         description "Event type";
       }
       uses nt:link-ref;
       uses te-topology-type;
       uses tet:te-link-config-attributes;
       uses tet:te-link-state-derived;
     }

     augment "/te-link-event/te-link-attributes/underlay" {
       description "Add state attributes to te-link underlay.";
       uses te-link-state-underlay-attributes;
     }
   }