Network Working Group M. Boucadair Internet-Draft C. Jacquenet Intended status: Standards Track France Telecom Expires: February 19, 2016 August 18, 2015 YANG Data Model for the DS-Lite Address Family Transition Router (AFTR) draft-boucadair-softwire-dslite-yang-00 Abstract This document defines a YANG data model for the DS-Lite Address Family Transition Router (AFTR). Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on February 19, 2016. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Boucadair & Jacquenet Expires February 19, 2016 [Page 1] Internet-Draft DS-Lite AFTR YANG August 2015 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 2 2. DS-Lite AFTR YANG Data Model . . . . . . . . . . . . . . . . 3 3. AFTR YANG Module . . . . . . . . . . . . . . . . . . . . . . 7 4. Security Considerations . . . . . . . . . . . . . . . . . . . 23 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 24 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 24 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.1. Normative references . . . . . . . . . . . . . . . . . . 24 7.2. Informative references . . . . . . . . . . . . . . . . . 25 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 26 1. Introduction This document defines a data model for DS-Lite [RFC6333] architectures, using the YANG data modeling language [RFC6020]. Only the Address Family Transition Router (AFTR) element is covered by this specification. As a reminder, [RFC6334] can be used to configure the name of the AFTR to a B4 element. This document assumes [RFC4787][RFC5382][RFC5508] are enabled by default. This document follows the guidelines of [RFC6087]. This document uses the common YANG types defined in [RFC6991]. 1.1. Terminology This document makes use of the terms defined in [RFC6333]. The terminology for describing YANG data models is defined in [RFC6020]. 1.2. Tree Diagrams The meaning of the symbols in these diagrams is as follows: o Brackets "[" and "]" enclose list keys. o Curly braces "{" and "}" contain names of optional features that make the corresponding node conditional. o Abbreviations before data node names: "rw" means configuration (read-write), "ro" state data (read-only). Boucadair & Jacquenet Expires February 19, 2016 [Page 2] Internet-Draft DS-Lite AFTR YANG August 2015 o Symbols after data node names: "?" means an optional node, "!" a container with presence, and "*" denotes a "list" or "leaf-list". o Parentheses enclose choice and case nodes, and case nodes are also marked with a colon (":"). o Ellipsis ("...") stands for contents of subtrees that are not shown. 2. DS-Lite AFTR YANG Data Model Figure 1 depicts the YANG data model for the AFTR element: module: ietf-dslite-aftr +--rw dslite-aftr-config | +--rw enable? boolean | +--rw dslite-aftr-instances | +--rw dslite-aftr-instance* [id] | +--rw id uint32 | +--rw name? string | +--rw dslite-aftr-ip-address* [address-id] | | +--rw address-id uint32 | | +--rw ip-address? inet:ipv6-address | +--rw ipv4-address? inet:ipv4-address | +--rw tunnel-mtu? uint16 | +--rw external-ip-address-pool* [address-id] | | +--rw address-id uint32 | | +--rw external-ip-pool? inet:ipv4-prefix | +--rw subscriber-mask? uint8 | +--rw port-quota uint16 | +--rw exclude-ports* [id] | | +--rw id uint16 | | +--rw (port-type)? | | +--:(single-port-number) | | | +--rw single-port-number? inet:port-number | | +--:(port-range) | | +--rw start-port-number? inet:port-number | | +--rw end-port-number? inet:port-number | +--rw port-set | | +--rw port-set-enable? boolean | | +--rw port-set-size? uint16 | | +--rw port-set-timeout? uint32 | +--rw enable-app? boolean | +--rw max-softwire-per-subscriber? uint8 | +--rw transport-protocol* [transport-protocol-id] | | +--rw transport-protocol-id uint8 | +--rw new-mappings-rate-limit? uint32 | +--rw mss-clamping-enable? boolean Boucadair & Jacquenet Expires February 19, 2016 [Page 3] Internet-Draft DS-Lite AFTR YANG August 2015 | +--rw port-randomization-enable? boolean | +--rw port-preservation-enable? boolean | +--rw port-parity-preservation-enable? boolean | +--rw udp-lifetime? uint32 | +--rw tcp-idle-timeout? uint32 | +--rw tcp-trans-open-timeout? uint32 | +--rw tcp-trans-close-timeout? uint32 | +--rw tcp-in-syn-timeout? uint32 | +--rw fragment-min-timeout? uint32 | +--rw icmp-timeout? uint32 | +--rw hold-down-timeout? uint32 | +--rw v6-v4-dscp-preservation boolean | +--rw logging-enable? boolean | +--rw mapping-table | +--rw mapping-entry* [index] | +--rw index uint32 | +--rw status? enumeration | +--rw type? enumeration | +--rw b4-ip-address inet:ipv6-address | +--rw internal-ip-address inet:ipv4-prefix | +--rw internal-port | | +--rw (port-type)? | | +--:(single-port-number) | | | +--rw single-port-number? inet:port-number | | +--:(port-range) | | +--rw start-port-number? inet:port-number | | +--rw end-port-number? inet:port-number | +--rw external-ip-address inet:ipv4-address | +--rw external-port | | +--rw (port-type)? | | +--:(single-port-number) | | | +--rw single-port-number? inet:port-number | | +--:(port-range) | | +--rw start-port-number? inet:port-number | | +--rw end-port-number? inet:port-number | +--rw transport-protocol uint8 | +--rw lifetime uint32 | +--rw v6-dscp? uint8 | +--rw internal-v4-dscp? uint8 | +--rw external-v4-dscp? uint8 | +--rw description? string +--ro dslite-aftr-state +--ro dslite-aftr-instances +--ro dslite-aftr-instance* [id] +--ro id int32 +--ro name? string +--ro aftr-capabilities | +--ro pcp-support? boolean Boucadair & Jacquenet Expires February 19, 2016 [Page 4] Internet-Draft DS-Lite AFTR YANG August 2015 | +--ro subscriber-mask-support? boolean | +--ro port-set-support? boolean | +--ro self-state-migration? boolean | +--ro mss-clamping-support? boolean | +--ro port-randomization-support? boolean | +--ro port-preservation-suport? boolean | +--ro port-parity-preservation-support? boolean | +--ro transport-proto-capabilities* [transport-protocol-id] | | +--ro transport-protocol-id uint8 | +--ro v6-v4-dscp-preservation-support? boolean | +--ro logging-support? boolean +--ro aftr-current-config | +--ro dslite-aftr-ip-address* [address-id] | | +--ro address-id uint32 | | +--ro ip-address? inet:ipv6-address | +--ro ipv4-address? inet:ipv4-address | +--ro tunnel-mtu? uint16 | +--ro external-ip-address-pool* [address-id] | | +--ro address-id uint32 | | +--ro external-ip-pool? inet:ipv4-prefix | +--ro subscriber-mask? uint8 | +--ro port-quota uint16 | +--ro exclude-ports* [id] | | +--ro id uint16 | | +--ro (port-type)? | | +--:(single-port-number) | | | +--ro single-port-number? inet:port-number | | +--:(port-range) | | +--ro start-port-number? inet:port-number | | +--ro end-port-number? inet:port-number | +--ro port-set | | +--ro port-set-enable? boolean | | +--ro port-set-size? uint16 | | +--ro port-set-timeout? uint32 | +--ro enable-app? boolean | +--ro max-softwire-per-subscriber? uint8 | +--ro transport-protocol* [transport-protocol-id] | | +--ro transport-protocol-id uint8 | +--ro new-mappings-rate-limit? uint32 | +--ro mss-clamping-enable? boolean | +--ro port-randomization-enable? boolean | +--ro port-preservation-enable? boolean | +--ro port-parity-preservation-enable? boolean | +--ro udp-lifetime? uint32 | +--ro tcp-idle-timeout? uint32 | +--ro tcp-trans-open-timeout? uint32 | +--ro tcp-trans-close-timeout? uint32 | +--ro tcp-in-syn-timeout? uint32 Boucadair & Jacquenet Expires February 19, 2016 [Page 5] Internet-Draft DS-Lite AFTR YANG August 2015 | +--ro fragment-min-timeout? uint32 | +--ro icmp-timeout? uint32 | +--ro hold-down-timeout? uint32 | +--ro v6-v4-dscp-preservation boolean | +--ro logging-enable? boolean +--ro mapping-table | +--ro mapping-entry* [index] | +--ro index uint32 | +--ro status? enumeration | +--ro type? enumeration | +--ro b4-ip-address inet:ipv6-address | +--ro internal-ip-address inet:ipv4-prefix | +--ro internal-port | | +--ro (port-type)? | | +--:(single-port-number) | | | +--ro single-port-number? inet:port-number | | +--:(port-range) | | +--ro start-port-number? inet:port-number | | +--ro end-port-number? inet:port-number | +--ro external-ip-address inet:ipv4-address | +--ro external-port | | +--ro (port-type)? | | +--:(single-port-number) | | | +--ro single-port-number? inet:port-number | | +--:(port-range) | | +--ro start-port-number? inet:port-number | | +--ro end-port-number? inet:port-number | +--ro transport-protocol uint8 | +--ro lifetime uint32 | +--ro v6-dscp? uint8 | +--ro internal-v4-dscp? uint8 | +--ro external-v4-dscp? uint8 | +--ro description? string +--ro statistics | +--ro traffic-statistics | | +--ro sent-packet? yang:zero-based-counter64 | | +--ro sent-byte? yang:zero-based-counter64 | | +--ro rcvd-packet? yang:zero-based-counter64 | | +--ro rcvd-byte? yang:zero-based-counter64 | | +--ro dropped-packet? yang:zero-based-counter64 | | +--ro dropped-byte? yang:zero-based-counter64 | +--ro mapping-table-stats | +--ro current-mt-size? yang:zero-based-counter64 | +--ro max-mt-size? uint32 +--ro available-capacity-client? percent +--ro available-capacity-ext? percent +--ro address-pool-in-use? percent +--ro port-in-use? percent Boucadair & Jacquenet Expires February 19, 2016 [Page 6] Internet-Draft DS-Lite AFTR YANG August 2015 Figure 1: YANG Data Model for DS-Lite AFTR 3. AFTR YANG Module file "ietf-dslite-aftr@2015-08-17.yang" module ietf-dslite-aftr { namespace "urn:ietf:params:xml:ns:yang:ietf-dslite-aftr"; prefix dslite-aftr; import ietf-inet-types { prefix inet; } import ietf-yang-types { prefix yang; } organization "xxxx Working Group"; contact "Mohamed Boucadair Christian Jacquenet "; description "This module is a YANG module for DS-Lite AFTR implementations. Copyright (c) 2015 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 (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2015-08-17 { description "Changes xxxx."; reference "xxxx"; } // Typedef typedef percent { type uint8 { range "0 .. 100"; } description "Percentage"; } Boucadair & Jacquenet Expires February 19, 2016 [Page 7] Internet-Draft DS-Lite AFTR YANG August 2015 /* * Grouping */ // port numbers: single or port range grouping port-number { description "Individual port or a range of ports."; choice port-type { default single-port-number; description "Port type: single or port-range."; case single-port-number { leaf single-port-number { type inet:port-number; description "Used for single port numbers."; } } case port-range { leaf start-port-number { type inet:port-number; description "Begining of the port range."; } leaf end-port-number { type inet:port-number; description "End of the port range."; } } } } // Timeout variables grouping lifetime { description "Configure values of various timeouts."; leaf udp-lifetime { type uint32; default 120; Boucadair & Jacquenet Expires February 19, 2016 [Page 8] Internet-Draft DS-Lite AFTR YANG August 2015 description "UDP inactivity timeout."; } leaf tcp-idle-timeout { type uint32; default 86400; description "TCP Idle timeout."; } leaf tcp-trans-open-timeout { type uint32; default 240; description "The value of the transitory open connection idle-timeout."; } leaf tcp-trans-close-timeout { type uint32; default 240; description "The value of the transitory close connection idle-timeout."; } leaf tcp-in-syn-timeout { type uint32; default 6; description "6 seconds, as defined in [RFC5382]."; } leaf fragment-min-timeout { type uint32; default 2; description "As long as the AFTR has available resources, the AFTR allows the fragments to arrive over fragment-min-timeout interval. The default value is inspired from RFC6146."; } leaf icmp-timeout { type uint32; default 60; description Boucadair & Jacquenet Expires February 19, 2016 [Page 9] Internet-Draft DS-Lite AFTR YANG August 2015 "60 seconds, as defined in [RFC5508]."; } leaf hold-down-timeout { type uint32; default 120; description "Hold down timer. Ports in the hold down pool are not reassigned till this timer expires."; } } // AFTR Parameters grouping aftr-parameters { description "A set of AFTR parameters"; list dslite-aftr-ipv6-address { key address-id; description "set one or multiple IP addresses for the dslite-aftr"; leaf address-id { type uint32; description "The identifier of the address"; } leaf ipv6-address { type inet:ipv6-address; description "IPv6 address of the dslite-aftr"; } } leaf ipv4-address { type inet:ipv4-address; description "IPv4 address of the DS-Lite AFTR. 192.0.0.1 is reserved for the AFTR element [RFC6333]. This address can be used to report ICMP problems and will appear in traceroute outputs."; Boucadair & Jacquenet Expires February 19, 2016 [Page 10] Internet-Draft DS-Lite AFTR YANG August 2015 } leaf tunnel-mtu { type uint16; description "Configures a tunnel MTU."; } list external-ip-address-pool { key address-id; description "Pool of external IP addresses used to service internal hosts. Both contiguous and non-contiguous pools can be configured to an AFTR."; leaf address-id { type uint32; description "An identifier of the address."; } leaf external-ip-pool { type inet:ipv4-prefix; description "An IPv4 prefix used by the AFTR for NAT purposes."; } } leaf subscriber-mask { type uint8 { range "0 .. 128"; } default "56"; description "The subscriber-mask is an integer that indicates the length of significant bits to be applied on the source IPv6 address (internal side) to unambiguously identify a CPE. Subscriber-mask is a system-wide configuration parameter that is used to enforce generic per-subscriberpolicies (e.g., port-quota). The enforcement of these generic policies does not Boucadair & Jacquenet Expires February 19, 2016 [Page 11] Internet-Draft DS-Lite AFTR YANG August 2015 require the configuration of every subscriber's prefix. Example: suppose the 2001:db8:100:100::/56 prefix is assigned to a DS-Lite enabled CPE. Suppose also that the 2001:db8:100:100::1 is the IPv6 address used by the B4 that resides in that CPE. When the AFTR receives a packet from this client, it applies the subscriber-mask (e.g., 56) on the source IPv6 address to compute the associated prefix for this client (that is 2001:db8:100:100::/56). Then, the AFTR enforces policies based on that prefix (2001:db8:100:100::/56), not on the exact source IPv6 address."; } leaf port-quota { type uint16; mandatory true; description "Configures a port quota to be assigned per subscriber."; } list exclude-ports { key "id"; description "The set of ports not to be assigned by the AFTR."; leaf id { type uint16; description "An identifier"; } uses port-number; } container port-set { description "Manages port-set assignments."; leaf port-set-enable { type boolean; description "Enable/Disable port set assignment."; } Boucadair & Jacquenet Expires February 19, 2016 [Page 12] Internet-Draft DS-Lite AFTR YANG August 2015 leaf port-set-size { type uint16; description "Indicates the size of assigned port sets."; } leaf port-set-timeout { type uint32; description "Inactivty timeout for port sets."; } } leaf enable-app { type boolean; default true; description "Enable/disable Address Pooling of Paired (APP) feature."; } leaf max-softwire-per-subscriber { type uint8; default 1; description "Configures the maximum softwire per subscriber feature."; } list transport-protocol { key "transport-protocol-id"; description "Set of (transport) protocols supported by the AFTR. Default must be set to TCP and UDP."; leaf transport-protocol-id { type uint8; description "Identifier of the transport protocol."; } } leaf new-mappings-rate-limit { type uint32; description "Rate-limit sessions per subscriber."; } Boucadair & Jacquenet Expires February 19, 2016 [Page 13] Internet-Draft DS-Lite AFTR YANG August 2015 leaf mss-clamping-enable { type boolean; description "Enable/disable MSS clamping feature."; } leaf port-randomization-enable { type boolean; description "Enable/disable port randomization feature."; } leaf port-preservation-enable { type boolean; description "Indicates whether the AFTR should preserve the internal port number."; } leaf port-parity-preservation-enable { type boolean; description "Indicates whether the AFTR should preserve the port parity of the internal port number."; } uses lifetime; leaf v6-v4-dscp-preservation { type boolean; mandatory true; description "Copies the DSCP value from the IPv6 header and vice versa."; } leaf logging-enable { type boolean; description "Enable logging features."; } } // Mapping Entry (Extended NAT44 mapping Entry) grouping mapping-entry { description Boucadair & Jacquenet Expires February 19, 2016 [Page 14] Internet-Draft DS-Lite AFTR YANG August 2015 "A DS-Lite AFTR mapping entry."; leaf index { type uint32; description "A unique identifier of a mapping entry."; } leaf status { type enumeration { enum "disabled" { description "The mapping entry is not in use (Disabled)."; } enum "assigned" { description "This mapping has been granted by the server."; } enum "stale" { description "This is a stale mapping (case of reboot)."; } } description "Indicates the status of a mapping entry."; } leaf type { type enumeration { enum "static" { description "The mapping entry is manually configured."; } enum "implicit" { description "This mapping is created by an outgoing packet."; } enum "explicit" { description "This is a dynamic explicit mapping created as a result of a PCP operation."; } Boucadair & Jacquenet Expires February 19, 2016 [Page 15] Internet-Draft DS-Lite AFTR YANG August 2015 } description "Indicates the type of a mapping entry. E.g., a mapping can be: static, dynamic implicit or dynamic explicit."; } leaf b4-ip-address { type inet:ipv6-address; mandatory true; description "Corresponds to the xxxx IP Address defined in xxx."; } leaf internal-ip-address { type inet:ipv4-prefix; mandatory true; description "Corresponds to the source IPv4 address of the IPv4 packet conveyed over the softwire."; } container internal-port { description "Corresponds to the source port of the IPv4 packet conveyed over the softwire."; uses port-number; } leaf external-ip-address { type inet:ipv4-address; mandatory true; description "External IPv4 address assigned by the AFTR."; } container external-port { description "External port number assigned by the AFTR."; uses port-number; } leaf transport-protocol { type uint8; mandatory true; description "Upper-layer protocol associated with this mapping. Boucadair & Jacquenet Expires February 19, 2016 [Page 16] Internet-Draft DS-Lite AFTR YANG August 2015 Values are taken from the IANA protocol registry. For example, this field contains 6 (TCP) for a TCP mapping or 17 (UDP) for a UDP mapping."; } leaf lifetime { type uint32; mandatory true; description "Lifetime of the mapping."; } leaf v6-dscp { type uint8; description "DSCP value used at the softwire level (i.e., IPv6 header)."; } leaf internal-v4-dscp { type uint8; description "DSCP value of the enacapsulated IPv4 packet."; } leaf external-v4-dscp { type uint8; description "DSCP value of the translated IPv4 packet as marked by the AFTR."; } leaf description { type string; description "A description string associated with the mapping."; } } /* * DS-Lite AFTR Configuration */ container dslite-aftr-config { description "dslite-aftr"; leaf enable { Boucadair & Jacquenet Expires February 19, 2016 [Page 17] Internet-Draft DS-Lite AFTR YANG August 2015 type boolean; description "Enable/Disable dslite-aftr function."; } container dslite-aftr-instances { description "dslite-aftr instances"; list dslite-aftr-instance { key "id"; description "a dslite-aftr instance."; leaf id { type uint32; description "dslite-aftr instance identifier."; } leaf name { type string; description "A name associated with the dslite-aftr instance."; } uses aftr-parameters; container mapping-table { description "dslite-aftr mapping table maintained by the dslite-aftr server."; list mapping-entry { key "index"; description "dslite-aftr mapping entry."; uses mapping-entry; } } } } } /* * DS-Lite AFTR State */ Boucadair & Jacquenet Expires February 19, 2016 [Page 18] Internet-Draft DS-Lite AFTR YANG August 2015 container dslite-aftr-state { config false; description "dslite-aftr"; container dslite-aftr-instances { description "dslite-aftr instances"; list dslite-aftr-instance { key "id"; description "dslite-aftr instance"; leaf id { type int32; description "The identifier of the dslite-aftr instance."; } leaf name { type string; description "The name of the dslite-aftr instance."; } container aftr-capabilities { description "AFTR capabilities"; leaf pcp-support { type boolean; description "Indicates whether a PCP server is enabled."; } leaf subscriber-mask-support{ type boolean; description "Indicates whether the subscriber-mask feature is supported"; } leaf port-set-support { type boolean; Boucadair & Jacquenet Expires February 19, 2016 [Page 19] Internet-Draft DS-Lite AFTR YANG August 2015 description "Indicates whether port set assignment is supported."; } leaf self-state-migration { type boolean; description "Indicates whether mappings migration to the new IPv6 address used by the B4 is supported."; } leaf mss-clamping-support { type boolean; description "Indicates whether the MSS clamping feature is supported."; } leaf port-randomization-support { type boolean; description "Indicates whether port randomization is supported."; } leaf port-preservation-support { type boolean; description "Indicates whether port preservation is supported."; } leaf port-parity-preservation-support { type boolean; description "Indicates whether port parity preservation is supported."; } list transport-proto-capabilities { key "transport-protocol-id"; description "A set of supported transport protocols."; leaf transport-protocol-id { type uint8; Boucadair & Jacquenet Expires February 19, 2016 [Page 20] Internet-Draft DS-Lite AFTR YANG August 2015 description "ID of the transport protocol."; } } leaf v6-v4-dscp-preservation-support { type boolean; description "Copy the DSCP value from the IPv6 header and vice versa."; } leaf logging-support { type boolean; description "Indicates whether a logging feature is supported."; } } container aftr-current-config { description "current config"; uses aftr-parameters; } container mapping-table { description "Mapping table"; list mapping-entry { key "index"; description "mapping entry"; uses mapping-entry; } } container statistics { description "traffic statistics"; container traffic-statistics { description "Generic traffic statistics."; leaf sent-packet { type yang:zero-based-counter64; Boucadair & Jacquenet Expires February 19, 2016 [Page 21] Internet-Draft DS-Lite AFTR YANG August 2015 description "Number of packets sent."; } leaf sent-byte { type yang:zero-based-counter64; description "Counter for sent traffic in bytes."; } leaf rcvd-packet { type yang:zero-based-counter64; description "Number of received packets."; } leaf rcvd-byte { type yang:zero-based-counter64; description "Counter for received traffic in bytes."; } leaf dropped-packet { type yang:zero-based-counter64; description "Number of dropped packets."; } leaf dropped-byte { type yang:zero-based-counter64; description "Counter for dropped traffic in bytes."; } } container mapping-table-stats { description "Mapping table statistics."; leaf current-mt-size { type yang:zero-based-counter64; description "Size of the mapping table."; } leaf max-mt-size { Boucadair & Jacquenet Expires February 19, 2016 [Page 22] Internet-Draft DS-Lite AFTR YANG August 2015 type uint32; description "Maximum configured size of the mapping table."; } } } leaf available-capacity-client { type percent; description "Ratio of available capacity in the customer-facing interfaces."; } leaf available-capacity-ext { type percent; description "Ratio of available capacity in the Internet-facing interfaces."; } leaf address-pool-in-use { type percent; description "Ratio of the shared address pool."; } leaf port-in-use { type percent; description "Ratio of the port usage."; } } } } } 4. Security Considerations The YANG module defined in this memo is designed to be accessed via the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the secure transport layer and the support of SSH is mandatory to implement secure transport [RFC6242]. The NETCONF access control model [RFC6536] provides means to restrict access for particular Boucadair & Jacquenet Expires February 19, 2016 [Page 23] Internet-Draft DS-Lite AFTR YANG August 2015 NETCONF users to a pre-configured subset of all available NETCONF protocol operations and contents. All data nodes defined in the YANG module which can be created, modified and deleted (i.e., config true, which is the default). These data nodes are considered sensitive. Write operations (e.g., edit-config) applied to these data nodes without proper protection can negatively affect network operations. 5. IANA Considerations This document requests IANA to register the following URI in the "IETF XML Registry" [RFC3688]: URI: urn:ietf:params:xml:ns:yang:ietf-dslite-aftr Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. This document requests IANA to register the following YANG module in the "YANG Module Names" registry [RFC6020]. name: ietf-dslite-aftr namespace: urn:ietf:params:xml:ns:yang:ietf-dslite-aftr prefix: dslite-aftr reference: RFC XXXX 6. Acknowledgements TBC. 7. References 7.1. Normative references [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . Boucadair & Jacquenet Expires February 19, 2016 [Page 24] Internet-Draft DS-Lite AFTR YANG August 2015 [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC6333] Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual- Stack Lite Broadband Deployments Following IPv4 Exhaustion", RFC 6333, DOI 10.17487/RFC6333, August 2011, . [RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration Protocol (NETCONF) Access Control Model", RFC 6536, DOI 10.17487/RFC6536, March 2012, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . 7.2. Informative references [RFC4787] Audet, F., Ed. and C. Jennings, "Network Address Translation (NAT) Behavioral Requirements for Unicast UDP", BCP 127, RFC 4787, DOI 10.17487/RFC4787, January 2007, . [RFC5382] Guha, S., Ed., Biswas, K., Ford, B., Sivakumar, S., and P. Srisuresh, "NAT Behavioral Requirements for TCP", BCP 142, RFC 5382, DOI 10.17487/RFC5382, October 2008, . [RFC5508] Srisuresh, P., Ford, B., Sivakumar, S., and S. Guha, "NAT Behavioral Requirements for ICMP", BCP 148, RFC 5508, DOI 10.17487/RFC5508, April 2009, . [RFC6087] Bierman, A., "Guidelines for Authors and Reviewers of YANG Data Model Documents", RFC 6087, DOI 10.17487/RFC6087, January 2011, . [RFC6334] Hankins, D. and T. Mrugalski, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Option for Dual-Stack Lite", RFC 6334, DOI 10.17487/RFC6334, August 2011, . Boucadair & Jacquenet Expires February 19, 2016 [Page 25] Internet-Draft DS-Lite AFTR YANG August 2015 Authors' Addresses Mohamed Boucadair France Telecom Rennes 35000 France EMail: mohamed.boucadair@orange.com Christian Jacquenet France Telecom Rennes 35000 France EMail: christian.jacquenet@orange.com Boucadair & Jacquenet Expires February 19, 2016 [Page 26]