A YANG Model for MPLS MSD

YANG is a data definition language used to define the contents of a conceptual data store that allows networked devices to be managed using NETCONF or RESTCONF . This document defines a YANG data model augmenting the IETF MPLS YANG model , which itself augments , to provide operational state for various MSDs. The augmentation defined in this document requires support for the MPLS base model which defines basic MPLS configuration and state. The YANG module in this document conforms to the Network Management Datastore Architecture (NMDA) .

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

This document defines a YANG module for MSD extensions to MPLS base model as defined in .

module: ietf-mpls-msd augment /rt:routing/mpls:mpls: +--ro node-msd +--ro node-msds* [] +--ro msd-type? identityref +--ro msd-value? uint8 augment /rt:routing/mpls:mpls/mpls:interfaces/mpls:interface: +--ro link-msd +--ro link-msds* [] +--ro msd-type? identityref +--ro msd-value? uint8

file "ietf-mpls-msd@2021-08-02.yang" module ietf-mpls-msd { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-msd"; prefix mpls-msd; import ietf-routing { prefix rt; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA Version)"; } import ietf-mpls { prefix mpls; reference "RFC 8960: A YANG Data Model for MPLS Base"; } organization "IETF MPLS - MPLS Working Group"; contact "WG Web: WG List: Author: Yingzhen Qu Author: Acee Lindem Author: Stephane Litkowski Author: Jeff Tantsura "; description "The YANG module augments the base MPLS model, and it is to manage different types of Maximum SID Depth (MSD). This YANG model conforms to the Network Management Datastore Architecture (NMDA) as described in RFC 8342. Copyright (c) 2021 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices. The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document are to be interpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; reference "RFC XXXX: YANG Data Model for Segment Routing."; revision 2021-08-02 { description "Initial Version"; reference "RFC XXXX: YANG Data Model for Segment Routing."; } identity msd-base-type { description "Base identity for Maximum SID Depth (MSD) Type"; } identity msd-mpls { base msd-base-type; description "Base MPLS Imposition MSD."; reference "RFC 8491: Singling Maximum SID Depth (MSD) using IS-IS."; } identity msd-erld { base msd-base-type; description "msd-erld is defined to advertise the Entropy Readable Label Depth (ERLD)."; reference "RFC 8662: Entropy Label for Source Packet Routing in Networking (SPRING) Tunnels"; } augment "/rt:routing/mpls:mpls" { description "This module augments MPLS data model (RFC 8960) with node MSD."; container node-msd { config false; description "Maximum SID Depth (MSD) operational state."; list node-msds { leaf msd-type { type identityref { base msd-base-type; } description "MSD types"; } leaf msd-value { type uint8; description "MSD value, in the range of 0-255."; } description "Node MSD is the smallest link MSD supported by the node."; } } } augment "/rt:routing/mpls:mpls/mpls:interfaces/mpls:interface" { description "This module augments MPLS data model (RFC 8960) with link MSD."; container link-msd { config false; description "Maximum SID Depth (MSD) interface operational state."; list link-msds { leaf msd-type { type identityref { base msd-base-type; } description "MSD type"; } leaf msd-value { type uint8; description "MSD value, in the range of 0-255."; } description "List of link MSDs"; } } } }

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    The YANG modules specified in this document define a schema for 
       data that is designed to be accessed via network
       management protocols such as NETCONF  or
       RESTCONF . The lowest NETCONF layer is the secure transport
       layer, and the mandatory-to-implement secure transport is Secure Shell (SSH)
       . The lowest RESTCONF layer is HTTPS, and the
       mandatory-to-implement secure transport is TLS .

   The NETCONF Access Control Model (NACM)  provides the 
      means to restrict access for particular NETCONF or RESTCONF users to a
      pre-configured subset of all available NETCONF or RESTCONF protocol 
      operations and content.

   There are a number of data nodes defined in the modules
      that are writable/creatable/deletable (i.e., config true, which is the default). 
      These data nodes may be considered sensitive or vulnerable in some network 
      environments. Write operations (e.g., edit-config) to these data nodes without 
      proper protection can have a negative effect on network operations.   

   Some of the readable data nodes in the modules
      may be considered sensitive or vulnerable in some network environments. It is thus 
      important to control read access (e.g., via get, get-config, or notification)
      to these data nodes. These are the
      subtrees and data nodes and their sensitivity/vulnerability:
      
        /rt:routing/mpls:mpls/msd/node-msds
        /rt:routing/mpls:mpls/msd/link-msds
        Exposure of the node's maximum SID depth may be useful in mounting a
          Denial-of-Service (DoS) attach by sending packets to the node that 
          the router can't process.
      

   

This document registers URIs in the IETF XML registry 
   .  Following the format in , 
   the following registrations is requested to be made:
   
     
   URI: urn:ietf:params:xml:ns:yang:ietf-mpls-msd
   Registrant Contact: The IESG.
   XML: N/A, the requested URI is an XML namespace.
    
   

   This document registers the YANG modules in the YANG Module Names
   registry .
   
     
   name: ietf-mpls-msd
   namespace: urn:ietf:params:xml:ns:yang:ietf-mpls-msd
   prefix: mpls-msd
   reference: RFC XXXX
    
   
   

    
      This document was produced using Marshall Rose's xml2rfc tool.
      The YANG model was developed using the suite of YANG tools written 
         and maintained by numerous authors.