One document matched: draft-xu-isis-encapsulation-cap-06.xml
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<rfc category="std" docName="draft-xu-isis-encapsulation-cap-06"
ipr="trust200902">
<front>
<title abbrev="Tunnelling Capability">Advertising Tunnelling Capability in
IS-IS</title>
<author fullname="Xiaohu Xu" initials="X.X." role="editor" surname="Xu">
<organization>Huawei</organization>
<address>
<email>xuxiaohu@huawei.com</email>
</address>
</author>
<author fullname="Bruno Decraene" initials="B.D." role="editor"
surname="Decraene">
<organization>Orange</organization>
<address>
<email>bruno.decraene@orange.com</email>
</address>
</author>
<author fullname="Robert Raszuk" initials="R.R." surname="Raszuk">
<organization>Mirantis Inc.</organization>
<address>
<email>robert@raszuk.net</email>
</address>
</author>
<author fullname="Uma Chunduri" initials="U.C." surname="Chunduri">
<organization>Ericsson</organization>
<address>
<email>uma.chunduri@ericsson.com</email>
</address>
</author>
<author fullname="Luis M. Contreras" initials="L.M." surname="Contreras">
<organization>Telefonica I+D</organization>
<address>
<postal>
<street>Ronda de la Comunicacion, s/n</street>
<street>Sur-3 building, 3rd floor</street>
<city>Madrid,</city>
<code>28050</code>
<country>Spain</country>
</postal>
<email>luismiguel.contrerasmurillo@telefonica.com</email>
<uri>http://people.tid.es/LuisM.Contreras/</uri>
</address>
</author>
<author fullname="Luay Jalil" initials="L.J." surname="Jalil">
<organization>Verizon</organization>
<address>
<email>luay.jalil@one.verizon.com</email>
</address>
</author>
<date year="2015"/>
<abstract>
<t>Some networks use tunnels for a variety of reasons. A large variety
of tunnel types are defined and the ingress needs to select a type of
tunnel which is supported by the egress. This document defines how to
advertise egress tunnel capabilities in IS-IS Router Capability TLV.</t>
</abstract>
</front>
<middle>
<section title="Introduction">
<t>Some networks use tunnels for a variety of reasons, such as:<list
hangIndent="1" style="symbols">
<t>Partial deployment of MPLS-SPRING as described in <xref
target="I-D.xu-spring-islands-connection-over-ip"/>, where IP
tunnels are used between MPLS-SPRING-enabled routers so as to
traverse non-MPLS routers.</t>
<t>Partial deployment of MPLS-BIER as described in Section 6.9 of
<xref target="I-D.ietf-bier-architecture"/>, where IP tunnels are
used between MPLS-BIER-capable routers so as to traverse non
MPLS-BIER <xref target="I-D.ietf-bier-mpls-encapsulation"/>
routers.</t>
<t>Partial deployment of IPv6 (resp. IPv4) in IPv4 (resp. IPv6)
networks as described in <xref target="RFC5565"/>, where IPvx
tunnels are used between IPvx-enabled routers so as to traverse
non-IPvx routers.</t>
<t>Remote Loop Free Alternate repair tunnels as described in <xref
target="RFC7490"/>, where tunnels are used between the Point of
Local Repair and the selected PQ node.</t>
</list></t>
<t>The ingress needs to select a type of tunnel which is supported by
the egress. This document describes how to use IS-IS Router Capability
TLV to advertise the egress tunnelling capabilities of nodes.</t>
<section title="Requirements Language">
<t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in <xref
target="RFC2119">RFC 2119</xref>.</t>
</section>
</section>
<section anchor="Terminology" title="Terminology">
<t>This memo makes use of the terms defined in <xref
target="RFC4971"/>.</t>
</section>
<section anchor="Capability" title="Advertising Encapsulation Capability">
<t>Routers advertises their supported encapsulation type(s) by
advertising a new sub-TLV of the IS-IS Router CAPABILITY TLV <xref
target="RFC4971"/>, referred to as Encapsulation Capability sub-TLV.
This sub-TLV SHOULD NOT appear more than once within a given IS-IS
Router CAPABILITY TLV. The scope of the advertisement depends on the
application but it is recommended that it SHOULD be domain-wide. The
Type code of the Encapsulation Capability sub-TLV is TBD1, the Length
value is variable, and the Value field contains one or more Tunnel
Encapsulation Type sub-TLVs. Each Encapsulation Type sub-TLVs indicates
a particular encapsulation format that the advertising router
supports.</t>
</section>
<section anchor="Encapsulation" title="Tunnel Encapsulation Type">
<t>The Tunnel Encapsulation Type sub-TLV is structured as follows:</t>
<t><figure align="left">
<preamble/>
<artwork align="left"><![CDATA[
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tunnel Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Value |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure></t>
<t>* Tunnel Type (1 octets): identifies the type of tunneling technology
being signaled. This document defines the following types:</t>
<t><list style="numbers">
<t>L2TPv3 over IP <xref target="RFC3931"/> : Type code=1;</t>
<t>GRE <xref target="RFC2784"/> : Type code=2;</t>
<t>Transmit tunnel endpoint <xref target="RFC5566"/> : Type
code=3;</t>
<t>IPsec in Tunnel-mode <xref target="RFC5566"/> : Type code=4;</t>
<t>IP in IP tunnel with IPsec Transport Mode <xref
target="RFC5566"/> : Type code=5;</t>
<t>MPLS-in-IP tunnel with IPsec Transport Mode <xref
target="RFC5566"/> : Type code=6;</t>
<t>IP in IP <xref target="RFC2003"/> <xref target="RFC4213"/>: Type
code=7;</t>
<t>VXLAN <xref target="RFC7348"/>: Type code=8;</t>
<t>NVGRE <xref target="RFC7637"/>: Type code=9;</t>
<t>MPLS <xref target="RFC3032"/>: Type code=10;</t>
<t>MPLS-in-GRE <xref target="RFC4023"/>: Type code=11;</t>
<t>VXLAN GPE <xref target="I-D.ietf-nvo3-vxlan-gpe"/>: Type
code=12;</t>
<t>MPLS-in-UDP <xref target="RFC7510"/>: Type code=13;</t>
<t>MPLS-in-UDP-with-DTLS <xref target="RFC7510"/>: Type code=14;</t>
<t>MPLS-in-L2TPv3 <xref target="RFC4817"/>: Type code=15;</t>
<t>GTP: Type code=16;</t>
</list></t>
<t/>
<t>Unknown types are to be ignored and skipped upon receipt.</t>
<t>* Length (1 octets): unsigned integer indicating the total number of
octets of the value field.</t>
<t>* Value (variable): zero or more Tunnel Encapsulation Attribute
sub-TLVs as defined in Section 5.</t>
</section>
<section anchor="Attribute" title="Tunnel Encapsulation Attribute">
<t>The Tunnel Encapsulation Attribute sub-TLV is structured as
follows:</t>
<t><figure align="left">
<preamble/>
<artwork align="left"><![CDATA[
+-----------------------------------+
| Sub-TLV Type (1 Octet) |
+-----------------------------------+
| Sub-TLV Length (1 Octet) |
+-----------------------------------+
| Sub-TLV Value (Variable) |
| |
+-----------------------------------+
]]></artwork>
</figure></t>
<t>* Sub-TLV Type (1 octet): each sub-TLV type defines a certain
property about the tunnel Encapsulation sub-TLV that contains this
sub-TLV. The following are the types defined in this document:</t>
<t><list style="numbers">
<t>Encapsulation Parameters: sub-TLV type = 1; (See Section 5.1)</t>
<t>Encapsulated Protocol: sub-TLV type = 2; (See Section 5.2)</t>
<t>End Point: sub-TLV type = 3; (See Section 5.3)</t>
<t>Color: sub-TLV type = 4; (See Section 5.4)</t>
</list></t>
<t>* Sub-TLV Length (1 octet): unsigned integer indicating the total
number of octets of the sub-TLV value field.</t>
<t>* Sub-TLV Value (variable): encodings of the value field depend on
the sub-TLV type as enumerated above. The following sub-sections define
the encoding in detail.</t>
<t>Any unknown sub-TLVs MUST be ignored and skipped. However, if the
Encapsulation Type sub-TLV is understood, the entire sub-TLV MUST NOT be
ignored just because it contains an unknown sub-TLV.</t>
<t>If a sub-TLV is erroneous, this specific Tunnel Encapsulation MUST be
ignored and skipped. However, others Tunnel Encapsulations MUST be
considered.</t>
<section anchor="TunnelParameters" title="Tunnel Parameters sub-TLV">
<t>This sub-TLV has its format defined in <xref target="RFC5512"/>
under the name Encapsulation sub-TLV.</t>
</section>
<section anchor="EncapsulatedProtocol"
title="Encapsulated Protocol sub-TLV">
<t>This sub-TLV has its format defined in <xref target="RFC5512"/>
under the name Protocol Type.</t>
</section>
<section anchor="EndPoint" title="End Point sub-TLV">
<t>The value field carries the Network Address to be used as tunnel
destination address.</t>
<t>If length is 4, the Address Family (AFI) is IPv4.</t>
<t>If length is 16, the Address Family (AFI) is IPv6.</t>
</section>
<section anchor="Color" title="Color sub-TLV">
<t>The valued field is a 4 octets opaque unsigned integer.</t>
<t>The color value is user defined and configured locally on the
routers. It may be used by the service providers to define
policies.</t>
</section>
</section>
<section anchor="IANA" title="IANA Considerations">
<section anchor="RI" title="IS-IS Router Capability">
<t>This document requests IANA to allocate a new code point from
registry IS-IS Router CAPABILITY TLV.</t>
<t><figure align="left">
<preamble/>
<artwork align="left"><![CDATA[
Value TLV Name Reference
----- ------------------------------------ -------------
TBD1 Tunnel Capabilities This document
]]></artwork>
</figure></t>
</section>
<section anchor="EncapsulationRegistry"
title="IGP Tunnel Encapsulation Types Registry">
<t>This document requests IANA to create a new registry "IGP Tunnel
Encapsulation Types" with the following registration procedure:</t>
<t><figure align="left">
<preamble/>
<artwork align="left"><![CDATA[
Registry Name: IGP Tunnel Encapsulation Type.
Value Name Reference
------- ------------------------------------------- -------------
0 Reserved This document
1 L2TPv3 over IP This document
2 GRE This document
3 Transmit tunnel endpoint This document
4 IPsec in Tunnel-mode This document
5 IP in IP tunnel with IPsec Transport Mode This document
6 MPLS-in-IP tunnel with IPsec Transport Mode This document
7 IP in IP This document
8 VXLAN This document
9 NVGRE This document
10 MPLS This document
11 MPLS-in-GRE This document
12 VXLAN-GPE This document
13 MPLS-in-UDP This document
14 MPLS-in-UDP-with-DTLS This document
15 MPLS-in-L2TPv3 This document
16 GTP This document
17-250 Unassigned
251-254 Experimental This document
255 Reserved This document
]]></artwork>
</figure></t>
<t>Assignments of Encapsulation Types are via Standards Action <xref
target="RFC5226"/>.</t>
</section>
<section anchor="AttributeRegistry"
title="IGP Tunnel Encapsulation Attribute Types Registry">
<t>This document requests IANA to create a new registry "IGP Tunnel
Encapsulation Attribute Types" with the following registration
procedure:</t>
<t><figure align="left">
<preamble/>
<artwork align="left"><![CDATA[
Registry Name: IGP Tunnel Encapsulation Attribute Types.
Value Name Reference
------- ------------------------------------ -------------
0 Reserved This document
1 Encapsulation parameters This document
2 Protocol This document
3 End Point This document
4 Color This document
5-250 Unassigned
251-254 Experimental This document
255 Reserved This document
]]></artwork>
</figure></t>
<t>Assignments of Encapsulation Types are via Standards Action <xref
target="RFC5226"/>.</t>
</section>
</section>
<section anchor="Security" title="Security Considerations">
<t>Security considerations applicable to softwires can be found in the
mesh framework <xref target="RFC5565"/>. In general, security issues of
the tunnel protocols signaled through this IGP capability extension are
inherited.</t>
<t>If a third party is able to modify any of the information that is
used to form encapsulation headers, to choose a tunnel type, or to
choose a particular tunnel for a particular payload type, user data
packets may end up getting misrouted, misdelivered, and/or dropped.</t>
<t>Security considerations for the base OSPF protocol are covered in
<xref target="RFC1195"/>.</t>
</section>
<section anchor="Acknowledgements" title="Acknowledgements">
<t>This document is partially inspired by <xref target="RFC5512"/>.</t>
<t>The authors would like to thank Carlos Pignataro and Karsten Thomann
for their valuable comments on this draft.</t>
</section>
</middle>
<back>
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<?rfc include="reference.RFC.4817"?>
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<?rfc include="reference.I-D.ietf-bier-architecture"?>
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<?rfc include="reference.I-D.ietf-nvo3-vxlan-gpe"?>
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</rfc>
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