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draft-ietf-netmod-sub-intf-vlan-model-11.xml
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draft-ietf-netmod-sub-intf-vlan-model-11.xml
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<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE rfc [
<!ENTITY nbsp " ">
<!ENTITY zwsp "​">
<!ENTITY nbhy "‑">
<!ENTITY wj "⁠">
]>
<!-- This template is for creating an Internet Draft using xml2rfc,
which is available here: http://xml.resource.org. -->
<?xml-stylesheet type='text/xsl' href='rfc2629.xslt' ?>
<!-- used by XSLT processors -->
<!-- For a complete list and description of processing instructions (PIs),
please see http://xml.resource.org/authoring/README.html. -->
<!-- Below are generally applicable Processing Instructions (PIs) that most I-Ds might want to use.
(Here they are set differently than their defaults in xml2rfc v1.32) -->
<?rfc strict="yes" ?>
<!-- give errors regarding ID-nits and DTD validation -->
<!-- control the table of contents (ToC) -->
<?rfc toc="yes"?>
<!-- generate a ToC -->
<?rfc tocdepth="4"?>
<!-- the number of levels of subsections in ToC. default: 3 -->
<!-- control references -->
<?rfc symrefs="yes"?>
<!-- use symbolic references tags, i.e, [RFC2119] instead of [1] -->
<?rfc sortrefs="yes" ?>
<!-- sort the reference entries alphabetically -->
<!-- control vertical white space
(using these PIs as follows is recommended by the RFC Editor) -->
<?rfc compact="yes" ?>
<!-- do not start each main section on a new page -->
<?rfc subcompact="no" ?>
<!-- keep one blank line between list items -->
<!-- end of list of popular I-D processing instructions -->
<rfc xmlns:xi="http://www.w3.org/2001/XInclude" category="std" consensus="true" docName="draft-ietf-netmod-sub-intf-vlan-model-11" ipr="trust200902" obsoletes="" updates="" submissionType="IETF" xml:lang="en" tocInclude="true" tocDepth="4" symRefs="true" sortRefs="true" version="3">
<!-- xml2rfc v2v3 conversion 3.15.0 -->
<!-- category values: std, bcp, info, exp, and historic
ipr values: full3667, noModification3667, noDerivatives3667
you can add the attributes updates="NNNN" and obsoletes="NNNN"
they will automatically be output with "(if approved)" -->
<!-- ***** FRONT MATTER ***** -->
<front>
<!-- The abbreviated title is used in the page header - it is only necessary if the
full title is longer than 39 characters -->
<title abbrev="Sub-interface VLAN YANG">Sub-interface VLAN YANG Data Models</title>
<seriesInfo name="Internet-Draft" value="draft-ietf-netmod-sub-intf-vlan-model-11"/>
<!-- add 'role="editor"' below for the editors if appropriate -->
<!-- Another author who claims to be an editor -->
<author fullname="Robert Wilton" initials="R.G." role="editor" surname="Wilton">
<organization>Cisco Systems</organization>
<address>
<email>[email protected]</email>
</address>
</author>
<author fullname="Scott Mansfield" initials="S" role="editor" surname="Mansfield">
<organization>Ericsson</organization>
<address>
<email>[email protected]</email>
</address>
</author>
<!-- uri and facsimile elements may also be added -->
<date year="2024"/>
<!-- If the month and year are both specified and are the current ones, xml2rfc will fill
in the current day for you. If only the current year is specified, xml2rfc will fill
in the current day and month for you. If the year is not the current one, it is
necessary to specify at least a month (xml2rfc assumes day="1" if not specified for the
purpose of calculating the expiry date). With drafts it is normally sufficient to
specify just the year. -->
<!-- Meta-data Declarations -->
<area>General</area>
<workgroup>Internet Engineering Task Force</workgroup>
<!-- WG name at the upperleft corner of the doc,
IETF is fine for individual submissions.
If this element is not present, the default is "Network Working Group",
which is used by the RFC Editor as a nod to the history of the IETF. -->
<keyword>template</keyword>
<!-- Keywords will be incorporated into HTML output
files in a meta tag but they have no effect on text or nroff
output. If you submit your draft to the RFC Editor, the
keywords will be used for the search engine. -->
<abstract>
<t>This document defines YANG modules to add support for classifying
traffic received on interfaces as Ethernet/VLAN framed packets to
sub-interfaces based on the fields available in the Ethernet/VLAN frame
headers. These modules allow configuration of Layer 3 and Layer 2
sub-interfaces (e.g. L2VPN attachment circuits) that can interoperate
with IETF based forwarding protocols; such as IP and L3VPN services; or
L2VPN services like VPWS, VPLS, and EVPN. The sub-interfaces also
interoperate with VLAN tagged traffic orignating from an IEEE 802.1Q
compliant bridge.</t>
<t>The model differs from an IEEE 802.1Q bridge model in that the
configuration is interface/sub-interface based as opposed to being based
on membership of an 802.1Q VLAN bridge.</t>
<t>The YANG data models in this document conforms to the Network
Management Datastore Architecture (NMDA) defined in RFC 8342.</t>
</abstract>
</front>
<middle>
<section numbered="true" toc="default">
<name>Introduction</name>
<t>This document defines two YANG <xref target="RFC7950" format="default"/> modules that
augment the encapsulation choice YANG element defined in <xref target="I-D.ietf-netmod-intf-ext-yang" format="default">Interface Extensions YANG</xref>
and the generic interfaces data model defined in <xref target="RFC8343" format="default"/>. The two modules provide configuration nodes to
support classification of Ethernet/VLAN traffic to sub-interfaces, that
can have interface based feature and service configuration applied to
them.</t>
<t>The purpose of these models is to allow IETF defined forwarding
protocols, for example, IPv6 <xref target="RFC8200" format="default"/>, Ethernet Pseudo Wires
<xref target="RFC4448" format="default"/> and VPLS <xref target="RFC4761" format="default"/> <xref target="RFC4762" format="default"/>, when configured via appropriate YANG data models <xref target="RFC8344" format="default"/>, to
interoperate with VLAN tagged traffic received from an IEEE 802.1Q
compliant bridge.</t>
<t>In the case of layer 2 Ethernet services, the flexible
encapsulation module also supports flexible rewriting of the
VLAN tags contained in the frame header.</t>
<t>For reference, a comparison between the sub-interface based YANG
model documented in this draft and an IEEE 802.1Q bridge model is
described in <xref target="comparison" format="default"/>.</t>
<t>In summary, the YANG modules defined in this internet draft are:
</t>
<ul empty="true" spacing="normal">
<li>ietf-if-vlan-encapsulation.yang - Defines the model for
basic classification of VLAN tagged traffic, normally to
L3 packet forwarding services</li>
<li>ietf-if-flexible-encapsulation.yang - Defines the model
for flexible classification of Ethernet/VLAN traffic,
normally to L2 frame forwarding services</li>
</ul>
<!-- <section title="Requirements Language">
</section>-->
<section numbered="true" toc="default">
<name>Terminology</name>
<t>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
<xref target="RFC2119" format="default"/> <xref target="RFC8174" format="default"/>
when, and only when, they appear in all capitals, as shown here.</t>
<t>The term 'sub-interface' is defined in section 2.6 of <xref target="I-D.ietf-netmod-intf-ext-yang" format="default">Interface Extensions
YANG</xref>.</t>
</section>
<section numbered="true" toc="default">
<name>Tree Diagrams</name>
<t>Tree diagrams used in this document follow the notation defined in
<xref target="RFC8340" format="default"/>.</t>
</section>
<section anchor="prefixes-in-data-node-names">
<name>Prefixes in Data Node Names</name>
<t>In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules, as shown in <xref target="tab-prefix"/>.</t>
<table anchor="tab-prefix">
<name>Prefixes for imported YANG modules</name>
<thead>
<tr>
<th align="left">Prefix</th>
<th align="left">YANG Module</th>
<th align="left">Reference</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">if-vlan</td>
<td align="left">ietf-if-vlan-encapsulation</td>
<td align="left">This document</td>
</tr>
<tr>
<td align="left">if-flex</td>
<td align="left">ietf-if-flexible-encapsulation</td>
<td align="left">This document</td>
</tr>
<tr>
<td align="left">if-ext</td>
<td align="left">ietf-if-extensions</td>
<td align="left"><xref target="I-D.ietf-netmod-intf-ext-yang"/></td>
</tr>
<tr>
<td align="left">if</td>
<td align="left">ietf-interfaces</td>
<td align="left"><xref target="RFC8343"/></td>
</tr>
<tr>
<td align="left">ianaift</td>
<td align="left">iana-if-type</td>
<td align="left"><xref target="RFC7224"/></td>
</tr>
<tr>
<td align="left">dot1q-types</td>
<td align="left">ieee802-dot1q-types</td>
<td align="left"><xref target="IEEE_802.1Q_2022"/></td>
</tr>
</tbody>
</table>
</section>
</section>
<section numbered="true" toc="default">
<name>Objectives</name>
<t>The primary aim of the YANG modules contained in this draft is to
provide the core model that is required to implement VLAN transport
services on router based devices that is fully compatible with IEEE
802.1Q compliant bridges.</t>
<t>A secondary aim is for the modules to be structured in such a way that
they can be cleanly extended in future.</t>
<section numbered="true" toc="default">
<name>Interoperability with IEEE 802.1Q compliant bridges</name>
<t>The modules defined in this document are designed to fully
interoperate with IEEE 802.1Q compliant bridges. In particular, the
models are restricted to only matching, adding, or rewriting the 802.1Q
VLAN tags in frames in ways that are compatible with IEEE 802.1Q
compliant bridges.</t>
</section>
</section>
<section numbered="true" toc="default">
<name>Interface VLAN Encapsulation Model</name>
<t>The Interface VLAN encapsulation model provides appropriate leaves for
termination of an 802.1Q VLAN tagged segment to a sub-interface (or
interface) based L3 service, such as IP. It allows for termination of
traffic with one or two 802.1Q VLAN tags.</t>
<t>The L3 service must be configured via a separate YANG data model,
e.g., <xref target="RFC8344" format="default"/>. A short example of configuring
802.1Q VLAN sub-interfaces with IP using YANG is provided in <xref target="example1" format="default"/>.</t>
<t keepWithNext="true">The "ietf-if-vlan-encapsulation" YANG module has the following structure:</t>
<artwork name="" type="" align="left" alt=""><![CDATA[
module: ietf-if-vlan-encapsulation
augment /if:interfaces/if:interface/if-ext:encapsulation
/if-ext:encaps-type:
+--:(dot1q-vlan)
+--rw dot1q-vlan
+--rw outer-tag
| +--rw tag-type dot1q-tag-type
| +--rw vlan-id vlanid
+--rw second-tag!
+--rw tag-type dot1q-tag-type
+--rw vlan-id vlanid
]]></artwork>
</section>
<section numbered="true" toc="default">
<name>Interface Flexible Encapsulation Model</name>
<t>The Interface Flexible Encapsulation model is designed to allow for
the flexible provisioning of layer 2 services. It provides the
capability to classify and demultiplex Ethernet/VLAN frames received on
an Ethernet trunk interface to sub-interfaces based on the fields
available in the layer 2 headers. Once classified to sub-interfaces, it
provides the capability to selectively modify fields within the layer 2
frame header before the frame is handed off to the appropriate
forwarding code for further handling. The forwarding instance, e.g.,
L2VPN, VPLS, etc., is configured using a separate YANG configuration
model defined elsewhere.</t>
<t>The model supports a common core set of layer 2 header matches based
on the 802.1Q tag type and VLAN Ids contained within the header up to a
tag stack depth of two tags.</t>
<t>The model supports flexible rewrites of the layer 2 frame header for
data frames as they are processed on the interface. It defines a set of
standard tag manipulations that allow for the insertion, removal, or
rewrite of one or two 802.1Q VLAN tags. The expectation is that
manipulations are generally implemented in a symmetrical fashion,
i.e. if a manipulation is performed on ingress traffic on an interface
then the reverse manipulation is always performed on egress traffic out
of the same interface. However, the model also allows for asymmetrical
rewrites, which may be required to implement some forwarding models
(such as E-Tree).</t>
<t>The model also allows a flexible encapsulation and rewrite to be
configured directly on an Ethernet or LAG interface without configuring
separate child sub-interfaces. Ingress frames that do not match the
encapsulation are dropped. Egress frames MUST conform to the
encapsulation. </t>
<t>The final aim for the model design is for it to be cleanly extensible
to add in additional match and rewrite criteria of the layer 2 header,
such as matching on the source or destination MAC address, PCP or DEI
fields in the 802.1Q tags, or the EtherType of the frame payload.
Rewrites can also be extended to allow for modification of other fields
within the layer 2 frame header.</t>
<t>A short example of configuring 802.1Q VLAN sub-interfaces with L2VPN
using YANG is provided in <xref target="example2" format="default"/>.</t>
<t keepWithNext="true">The "ietf-if-flexible-encapsulation" YANG module has the following
structure:</t>
<artwork name="" type="" align="left" alt=""><![CDATA[
module: ietf-if-flexible-encapsulation
augment /if:interfaces/if:interface/if-ext:encapsulation
/if-ext:encaps-type:
+--:(flexible)
+--rw flexible
+--rw match
| +--rw (match-type)
| +--:(default)
| | +--rw default? empty
| +--:(untagged)
| | +--rw untagged? empty
| +--:(dot1q-priority-tagged)
| | +--rw dot1q-priority-tagged
| | +--rw tag-type dot1q-types:dot1q-tag-type
| +--:(dot1q-vlan-tagged)
| +--rw dot1q-vlan-tagged
| +--rw outer-tag
| | +--rw tag-type dot1q-tag-type
| | +--rw vlan-id union
| +--rw second-tag!
| | +--rw tag-type dot1q-tag-type
| | +--rw vlan-id union
| +--rw match-exact-tags? empty
+--rw rewrite {flexible-rewrites}?
| +--rw (direction)?
| +--:(symmetrical)
| | +--rw symmetrical
| | +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
| | +--rw pop-tags? uint8
| | +--rw push-tags!
| | +--rw outer-tag
| | | +--rw tag-type dot1q-tag-type
| | | +--rw vlan-id vlanid
| | +--rw second-tag!
| | +--rw tag-type dot1q-tag-type
| | +--rw vlan-id vlanid
| +--:(asymmetrical) {asymmetric-rewrites}?
| +--rw ingress
| | +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
| | +--rw pop-tags? uint8
| | +--rw push-tags!
| | +--rw outer-tag
| | | +--rw tag-type dot1q-tag-type
| | | +--rw vlan-id vlanid
| | +--rw second-tag!
| | +--rw tag-type dot1q-tag-type
| | +--rw vlan-id vlanid
| +--rw egress
| +--rw dot1q-tag-rewrite {dot1q-tag-rewrites}?
| +--rw pop-tags? uint8
| +--rw push-tags!
| +--rw outer-tag
| | +--rw tag-type dot1q-tag-type
| | +--rw vlan-id vlanid
| +--rw second-tag!
| +--rw tag-type dot1q-tag-type
| +--rw vlan-id vlanid
+--rw local-traffic-default-encaps!
+--rw outer-tag
| +--rw tag-type dot1q-tag-type
| +--rw vlan-id vlanid
+--rw second-tag!
+--rw tag-type dot1q-tag-type
+--rw vlan-id vlanid
]]></artwork>
</section>
<section numbered="true" toc="default">
<name>VLAN Encapsulation YANG Module</name>
<t>This YANG module augments the 'encapsulation' container
defined in <xref target="I-D.ietf-netmod-intf-ext-yang" format="default">ietf-if-extensions.yang</xref>.
It also contains references to <xref target="RFC8343" format="default"/>,
<xref target="RFC7224" format="default"/>, and <xref target="IEEE_802.1Q_2022" format="default"/>.</t>
<sourcecode name="[email protected]" type="" markers="true"><![CDATA[
module ietf-if-vlan-encapsulation {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-if-vlan-encapsulation";
prefix if-vlan;
import ietf-interfaces {
prefix if;
reference
"RFC 8343: A YANG Data Model For Interface Management";
}
import iana-if-type {
prefix ianaift;
reference
"RFC 7224: IANA Interface Type YANG Module";
}
import ieee802-dot1q-types {
prefix dot1q-types;
revision-date 2022-01-19;
reference
"IEEE Std 802.1Q-2022: IEEE Standard for Local and
metropolitan area networks -- Bridges and Bridged Networks";
}
import ietf-if-extensions {
prefix if-ext;
reference
"RFC XXXX: Common Interface Extension YANG Data Models";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netmod/>
WG List: <mailto:[email protected]>
Editor: Robert Wilton
<mailto:[email protected]>";
description
"This YANG module models configuration to classify IEEE 802.1Q
VLAN tagged Ethernet traffic by exactly matching the tag type
and VLAN identifier of one or two 802.1Q VLAN tags in the frame.
Copyright (c) 2024 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 Revised 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
(https://www.rfc-editor.org/info/rfcXXXX); 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.";
revision 2023-01-26 {
description
"Latest draft revision";
reference
"RFC XXXX: Sub-interface VLAN YANG Data Models";
}
augment "/if:interfaces/if:interface/if-ext:encapsulation/"
+ "if-ext:encaps-type" {
when "derived-from-or-self(../if:type,
'ianaift:ethernetCsmacd') or
derived-from-or-self(../if:type,
'ianaift:ieee8023adLag') or
derived-from-or-self(../if:type, 'ianaift:l2vlan') or
derived-from-or-self(../if:type,
'if-ext:ethSubInterface')" {
description
"Applies only to Ethernet-like interfaces and
sub-interfaces.";
}
description
"Augment the generic interface encapsulation with basic 802.1Q
VLAN tag classifications";
case dot1q-vlan {
container dot1q-vlan {
description
"Classifies 802.1Q VLAN tagged Ethernet frames to a
sub-interface (or interface) by exactly matching the
number of tags, tag type(s) and VLAN identifier(s).
Only frames matching the classification configured on a
sub-interface/interface are processed on that
sub-interface/interface.
Frames that do not match any sub-interface are processed
directly on the parent interface, if it is associated with
a forwarding instance, otherwise they are dropped.";
container outer-tag {
must 'tag-type = "dot1q-types:s-vlan" or '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"Only C-VLAN and S-VLAN tags can be matched.";
description
"For IEEE 802.1Q interoperability, only C-VLAN and
S-VLAN tags are matched.";
}
description
"Specifies the VLAN tag values to match against the
outermost (first) 802.1Q VLAN tag in the frame.";
uses dot1q-types:dot1q-tag-classifier-grouping;
}
container second-tag {
must '../outer-tag/tag-type = "dot1q-types:s-vlan" and '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"When matching two 802.1Q VLAN tags, the outermost
(first) tag in the frame MUST be specified and be of
S-VLAN type and the second tag in the frame must be of
C-VLAN tag type.";
description
"For IEEE 802.1Q interoperability, when matching two
802.1Q VLAN tags, it is REQUIRED that the outermost
tag exists and is an S-VLAN, and the second tag is a
C-VLAN.";
}
presence "Classify frames that have two 802.1Q VLAN tags.";
description
"Specifies the VLAN tag values to match against the
second outermost 802.1Q VLAN tag in the frame.";
uses dot1q-types:dot1q-tag-classifier-grouping;
}
}
}
}
}
]]></sourcecode>
</section>
<section numbered="true" toc="default">
<name>Flexible Encapsulation YANG Module</name>
<t>This YANG module augments the 'encapsulation' container
defined in <xref target="I-D.ietf-netmod-intf-ext-yang" format="default">ietf-if-extensions.yang</xref>.
This YANG module also augments the 'interface' list entry
defined in <xref target="RFC8343" format="default"/>. It also contains
references to <xref target="RFC7224" format="default"/>, and <xref target="IEEE_802.1Q_2022" format="default"/>.</t>
<sourcecode name="[email protected]" type="" markers="true"><![CDATA[
module ietf-if-flexible-encapsulation {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-if-flexible-encapsulation";
prefix if-flex;
import ietf-interfaces {
prefix if;
reference
"RFC 8343: A YANG Data Model For Interface Management";
}
import iana-if-type {
prefix ianaift;
reference
"RFC 7224: IANA Interface Type YANG Module";
}
import ieee802-dot1q-types {
prefix dot1q-types;
revision-date 2022-01-19;
reference
"IEEE Std 802.1Q-2022: IEEE Standard for Local and
metropolitan area networks -- Bridges and Bridged Networks";
}
import ietf-if-extensions {
prefix if-ext;
reference
"RFC XXXX: Common Interface Extension YANG Data Models";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netmod/>
WG List: <mailto:[email protected]>
Editor: Robert Wilton
<mailto:[email protected]>";
description
"This YANG module describes interface configuration for flexible
classification and rewrites of IEEE 802.1Q VLAN tagged Ethernet
traffic.
Copyright (c) 2022 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 Revised 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
(https://www.rfc-editor.org/info/rfcXXXX); 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.";
revision 2023-01-26 {
description
"Latest draft revision";
reference
"RFC XXXX: Sub-interface VLAN YANG Data Models";
}
feature flexible-rewrites {
description
"This feature indicates that the network element supports
specifying flexible rewrite operations.";
}
feature asymmetric-rewrites {
description
"This feature indicates that the network element supports
specifying different rewrite operations for the ingress
rewrite operation and egress rewrite operation.";
}
feature dot1q-tag-rewrites {
description
"This feature indicates that the network element supports the
flexible rewrite functionality specifying 802.1Q tag
rewrites.";
}
grouping flexible-match {
description
"Represents a flexible frame classification:
The rules for a flexible match are:
1. Match-type: default, untagged, priority tag, or tag
stack.
2. Each tag in the stack of tags matches:
a. tag type (802.1Q or 802.1ad) +
b. tag value:
i. single tag
ii. set of tag ranges/values.
iii. 'any' keyword";
choice match-type {
mandatory true;
description
"Provides a choice of how the frames may be
matched";
case default {
description
"Default match";
leaf default {
type empty;
description
"Default match. Matches all traffic not matched to any
other peer sub-interface by a more specific
encapsulation.";
}
}
case untagged {
description
"Match untagged Ethernet frames only";
leaf untagged {
type empty;
description
"Untagged match. Matches all untagged traffic.";
}
}
case dot1q-priority-tagged {
description
"Match 802.1Q priority tagged Ethernet frames only";
container dot1q-priority-tagged {
description
"802.1Q priority tag match";
leaf tag-type {
type dot1q-types:dot1q-tag-type;
mandatory true;
description
"The 802.1Q tag type of matched priority
tagged packets";
}
}
}
case dot1q-vlan-tagged {
container dot1q-vlan-tagged {
description
"Matches VLAN tagged frames";
container outer-tag {
must 'tag-type = "dot1q-types:s-vlan" or '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"Only C-VLAN and S-VLAN tags can be matched.";
description
"For IEEE 802.1Q interoperability, only C-VLAN and
S-VLAN tags can be matched.";
}
description
"Classifies traffic using the outermost (first) VLAN
tag on the frame.";
uses "dot1q-types:"
+ "dot1q-tag-ranges-or-any-classifier-grouping";
}
container second-tag {
must
'../outer-tag/tag-type = "dot1q-types:s-vlan" and '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"When matching two tags, the outermost (first) tag
must be specified and of S-VLAN type and the second
outermost tag must be of C-VLAN tag type.";
description
"For IEEE 802.1Q interoperability, when matching two
tags, it is required that the outermost (first) tag
exists and is an S-VLAN, and the second outermost
tag is a C-VLAN.";
}
presence "Also classify on the second VLAN tag.";
description
"Classifies traffic using the second outermost VLAN tag
on the frame.";
uses "dot1q-types:"
+ "dot1q-tag-ranges-or-any-classifier-grouping";
}
leaf match-exact-tags {
type empty;
description
"If set, indicates that all 802.1Q VLAN tags in the
Ethernet frame header must be explicitly matched, i.e.
the EtherType following the matched tags must not be a
802.1Q tag EtherType. If unset then extra 802.1Q VLAN
tags are allowed.";
}
}
}
}
}
grouping dot1q-tag-rewrite {
description
"Flexible rewrite grouping. Can be either be expressed
symmetrically, or independently in the ingress and/or egress
directions.";
leaf pop-tags {
type uint8 {
range "1..2";
}
description
"The number of 802.1Q VLAN tags to pop, or translate if used
in conjunction with push-tags.
Popped tags are the outermost tags on the frame.";
}
container push-tags {
presence "802.1Q tags are pushed or translated";
description
"The 802.1Q tags to push on the front of the frame, or
translate if configured in conjunction with pop-tags.";
container outer-tag {
must 'tag-type = "dot1q-types:s-vlan" or '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message "Only C-VLAN and S-VLAN tags can be pushed.";
description
"For IEEE 802.1Q interoperability, only C-VLAN and S-VLAN
tags can be pushed.";
}
description
"The outermost (first) VLAN tag to push onto the frame.";
uses dot1q-types:dot1q-tag-classifier-grouping;
}
container second-tag {
must '../outer-tag/tag-type = "dot1q-types:s-vlan" and '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"When pushing/rewriting two tags, the outermost tag must
be specified and of S-VLAN type and the second outermost
tag must be of C-VLAN tag type.";
description
"For IEEE 802.1Q interoperability, when pushing two tags,
it is required that the outermost tag exists and is an
S-VLAN, and the second outermost tag is a C-VLAN.";
}
presence
"In addition to the first tag, also push/rewrite a second
VLAN tag.";
description
"The second outermost VLAN tag to push onto the frame.";
uses dot1q-types:dot1q-tag-classifier-grouping;
}
}
}
grouping flexible-rewrite {
description
"Grouping for flexible rewrites of fields in the L2 header.
Restricted to flexible 802.1Q VLAN tag rewrites, but could be
extended to cover rewrites of other fields in the L2 header in
future.";
container dot1q-tag-rewrite {
if-feature "dot1q-tag-rewrites";
description
"802.1Q VLAN tag rewrite.
Translate operations are expressed as a combination of tag
push and pop operations. E.g., translating the outer tag is
expressed as popping a single tag, and pushing a single tag.
802.1Q tags that are translated SHOULD preserve the PCP and
DEI fields unless if a different QoS behavior has been
specified.";
uses dot1q-tag-rewrite;
}
}
augment "/if:interfaces/if:interface/if-ext:encapsulation/"
+ "if-ext:encaps-type" {
when "derived-from-or-self(../if:type,
'ianaift:ethernetCsmacd') or
derived-from-or-self(../if:type,
'ianaift:ieee8023adLag') or
derived-from-or-self(../if:type, 'ianaift:l2vlan') or
derived-from-or-self(../if:type,
'if-ext:ethSubInterface')" {
description
"Applies only to Ethernet-like interfaces and
sub-interfaces.";
}
description
"Augment the generic interface encapsulation with flexible
match and rewrite for VLAN sub-interfaces.";
case flexible {
description
"Flexible encapsulation and rewrite";
container flexible {
description
"Flexible encapsulation allows for the matching of ranges
and sets of 802.1Q VLAN Tags and performing rewrite
operations on the VLAN tags.
The structure is also designed to be extended to allow for
matching/rewriting other fields within the L2 frame header
if required.";
container match {
description
"Flexibly classifies Ethernet frames to a sub-interface
(or interface) based on the L2 header fields.
Only frames matching the classification configured on a
sub-interface/interface are processed on that
sub-interface/interface.
Frames that do not match any sub-interface are processed
directly on the parent interface, if it is associated
with a forwarding instance, otherwise they are dropped.
If a frame could be classified to multiple
sub-interfaces then they get classified to the
sub-interface with the most specific match. E.g.,
matching two VLAN tags in the frame is more specific
than matching the outermost VLAN tag, which is more
specific than the catch all 'default' match.";
uses flexible-match;
}
container rewrite {
if-feature "flexible-rewrites";
description
"L2 frame rewrite operations.
Rewrites allows for modifications to the L2 frame header
as it transits the interface/sub-interface. Examples
include adding a VLAN tag, removing a VLAN tag, or
rewriting the VLAN Id carried in a VLAN tag.";
choice direction {
description
"Whether the rewrite policy is symmetrical or
asymmetrical.";
case symmetrical {
container symmetrical {
uses flexible-rewrite;
description
"Symmetrical rewrite. Expressed in the ingress
direction, but the reverse operation is applied to
egress traffic.
E.g., if a tag is pushed on ingress traffic, then
the reverse operation is a 'pop 1', that is
performed on traffic egressing the interface, so
a peer device sees a consistent L2 encapsulation
for both ingress and egress traffic.";
}
}
case asymmetrical {
if-feature "asymmetric-rewrites";
description
"Asymmetrical rewrite.
Rewrite operations may be specified in only a single
direction, or different rewrite operations may be
specified in each direction.";
container ingress {
uses flexible-rewrite;
description
"A rewrite operation that only applies to ingress
traffic.
Ingress rewrite operations are performed before
the frame is subsequently processed by the
forwarding operation.";
}
container egress {
uses flexible-rewrite;
description
"A rewrite operation that only applies to egress
traffic.";
}
}
}
}
container local-traffic-default-encaps {
presence "A local traffic default encapsulation has been
specified.";
description
"Specifies the 802.1Q VLAN tags to use by default for
locally sourced traffic from the interface.
Used for encapsulations that match a range of VLANs (or
'any'), where the source VLAN Ids are otherwise
ambiguous.";
container outer-tag {
must 'tag-type = "dot1q-types:s-vlan" or '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"Only C-VLAN and S-VLAN tags can be matched.";
description
"For IEEE 802.1Q interoperability, only C-VLAN and
S-VLAN tags can be matched.";
}
description
"The outermost (first) VLAN tag for locally sourced
traffic.";
uses dot1q-types:dot1q-tag-classifier-grouping;
}
container second-tag {
must
'../outer-tag/tag-type = "dot1q-types:s-vlan" and '
+ 'tag-type = "dot1q-types:c-vlan"' {
error-message
"When specifying two tags, the outermost (first) tag
must be specified and of S-VLAN type and the second
outermost tag must be of C-VLAN tag type.";
description
"For IEEE 802.1Q interoperability, when specifying