rfc9792.original.xml   rfc9792.xml 
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<?rfc subcompact="no" ?> docName="draft-ietf-lsr-ospf-prefix-extended-flags-07" number="9792" updates=""
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<rfc category="std" ipr="trust200902" docName="draft-ietf-lsr-ospf-prefix-extend
ed-flags-07"
consensus="true" submissionType="IETF" version="3">
<front> <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="Prefix Flag Extension for OSPF">Prefix Flag Extension for OSPF v2 and OSPFv3</title> <title abbrev="Prefix Flag Extension for OSPF">Prefix Flag Extension for OSPF v2 and OSPFv3</title>
<seriesInfo name="Internet-Draft" value="draft-ietf-lsr-ospf-prefix-extended <seriesInfo name="RFC" value="9792"/>
-flags-07"/> <author initials='R.' surname="Chen" fullname='Ran Chen'>
<!-- add 'role="editor"' below for the editors if appropriate --> <organization>ZTE Corporation</organization>
<!-- Another author who claims to be an editor -->
<author initials='R.' surname="Chen" fullname='Ran Chen'>
<organization>ZTE Corporation</organization>
<address> <address>
<postal> <postal>
<street/> <city>Nanjing</city>
<!-- Reorder these if your country does things differently -->
<city>Nanjing</city>
<region/>
<code/>
<country>China</country> <country>China</country>
</postal> </postal>
<email>chen.ran@zte.com.cn</email> <email>chen.ran@zte.com.cn</email>
<!-- uri and facsimile elements may also be added -->
</address> </address>
</author> </author>
<author initials='D.' surname="Zhao" fullname='Detao Zhao'> <author initials='D.' surname="Zhao" fullname='Detao Zhao'>
<organization>ZTE Corporation</organization> <organization>ZTE Corporation</organization>
<address> <address>
<postal> <postal>
<street/> <city>Nanjing</city>
<!-- Reorder these if your country does things differently -->
<city>Nanjing</city>
<region/>
<code/>
<country>China</country> <country>China</country>
</postal> </postal>
<email>zhao.detao@zte.com.cn</email> <email>zhao.detao@zte.com.cn</email>
<!-- uri and facsimile elements may also be added -->
</address> </address>
</author> </author>
<author initials='P.' surname="Psenak" fullname='Peter Psenak'> <author initials='P.' surname="Psenak" fullname='Peter Psenak'>
<organization>Cisco Systems</organization> <organization>Cisco Systems</organization>
<address> <address>
<postal> <postal>
<street>Apollo Business Center</street> <street>Apollo Business Center</street>
<street>Mlynske nivy 43</street> <street>Mlynske nivy 43</street>
<city>Bratislava 821 09</city> <city>Bratislava</city>
<country>Slovakia</country> <code>821 09</code>
<code></code> <country>Slovakia</country>
</postal> </postal>
<email>ppsenak@cisco.com</email> <email>ppsenak@cisco.com</email>
</address> </address>
</author> </author>
<author initials='K.' surname="Talaulikar" fullname='Ketan Talaulikar'> <author initials='K.' surname="Talaulikar" fullname='Ketan Talaulikar'>
<organization>Cisco Systems</organization> <organization>Cisco Systems</organization>
<address> <address>
<postal> <postal>
<street/>
<!-- Reorder these if your country does things differently -->
<city/>
<region/>
<code/>
<country>India</country> <country>India</country>
</postal> </postal>
<email>ketant.ietf@gmail.com</email> <email>ketant.ietf@gmail.com</email>
<!-- uri and facsimile elements may also be added -->
</address> </address>
</author> </author>
<author initials='L.' surname="Gong" fullname='Liyan Gong'> <author initials='L.' surname="Gong" fullname='Liyan Gong'>
<organization>China mobile</organization> <organization>China mobile</organization>
<address> <address>
<postal> <postal>
<street/>
<!-- Reorder these if your country does things differently -->
<city/>
<region/>
<code/>
<country>China</country> <country>China</country>
</postal> </postal>
<email>gongliyan@chinamobile.com</email> <email>gongliyan@chinamobile.com</email>
<!-- uri and facsimile elements may also be added -->
</address> </address>
</author> </author>
<date year="2025"/> <date year="2025" month="June"/>
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<area>Routing</area>
<workgroup>LSR</workgroup>
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<keyword>Internet Draft</keyword> <area>RTG</area>
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<abstract> <abstract>
<t>Each OSPF prefix can be advertised with an 8-bit field to indicate spec <t>Each OSPF prefix can be advertised with an 8-bit field to indicate spec
ific properties of that prefix. However, all the OSPFv3 Prefix Options bits have ific properties of that prefix. However, all the OSPFv3 Prefix Options bits have
already been assigned and only a few bits remain unassigned in the flags field already been assigned, and only a few bits remain unassigned in the Flags field
of the OSPFv2 Extended Prefix TLV.</t> of the OSPFv2 Extended Prefix TLV.</t>
<t>This document solves this problem by defining variable-length Prefix At <t>This document solves this problem by defining a variable-length Prefix
tribute Flags sub-TLV for OSPF. This sub-TLV is applicable to OSPFv2 and OSPFv3. Extended Flags sub-TLV for OSPF. This sub-TLV is applicable to OSPFv2 and OSPFv3
</t> .</t>
</abstract> </abstract>
</front> </front>
<middle> <middle>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>Introduction</name> <name>Introduction</name>
<t>Each OSPF prefix can be advertised with an 8-bit field to indicate spec <t>Each OSPF prefix can be advertised with an 8-bit field to indicate spec
ific properties of that prefix. This is done using the OSPFv3 Prefix Options (Ap ific properties of that prefix. This is done using the OSPFv3 Prefix Options (<x
pendix A.4.1.1 of <xref target="RFC5340" format="default"></xref>) and the flags ref section="A.4.1.1" target="RFC5340" format="default"></xref>) and the Flags f
field in the OSPFv2 Extended Prefix TLV (Section 2.1 of <xref target="RFC7684" ield in the OSPFv2 Extended Prefix TLV (<xref target="RFC7684" sectionFormat="of
format="default"></xref>). The rest of this document refers to these 8-bit field " section="2.1"/>). The rest of this document refers to these 8-bit fields in bo
s in both OSPFv2 and OSPFv3 as the "existing fixed-size prefix attribute flags". th OSPFv2 and OSPFv3 as the "existing fixed-size prefix flags".</t>
</t> <t>However, all the OSPFv3 Prefix Options bits have already been assigned
<t>However, all the OSPFv3 Prefix Options bits have already been assigned (see the "OSPFv3 Prefix Options (8 bits)" IANA registry <xref target="IANA-OSPFv
(see "OSPFv3 Prefix Options (8 bits)" IANA registry <xref target="IANA-OSPFv3-P 3-PO"/>). Also, at the time of publication of this document, only 5 bits remain
O"/>). Also, only 5 bits remain unassigned (at the time of publication of this d unassigned in the Flags field of the OSPFv2 Extended Prefix TLV (see the "OSPFv2
ocument) in the Flags field of the OSPFv2 Extended Prefix TLV (see "OSPFv2 Exten Extended Prefix TLV Flags" IANA registry <xref target="IANA-OSPFv2-EPF"/>).</t>
ded Prefix TLV Flags" IANA registry <xref target="IANA-OSPFv2-EPF"/>).</t> <t>This document solves the problem of insufficient flag bits for the sign
<t>This document solves the problem of insufficient flag bits for the sign aling of prefix properties in OSPF by defining a variable-length Prefix Extended
aling of prefix properties in OSPF by defining variable-length Prefix Attribute Flags sub-TLV for OSPFv2 and OSPFv3.</t>
Flags sub-TLVs for OSPFv2 and OSPFv3.</t>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>Requirements Language</name> <name>Requirements Language</name>
<t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", " <t>
SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" i The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>", "<bcp14>REQU
n this document are to be interpreted as described in BCP 14 <xref target="RFC21 IRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL
19" format="default"></xref> <xref target="RFC8174" format="default"></xref> whe NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>", "<bcp14>
n, and only when, they appear in all capitals, as shown here.</t> RECOMMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>",
"<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are to
be interpreted as
described in BCP&nbsp;14 <xref target="RFC2119"/> <xref target="RFC8174"/>
when, and only when, they appear in all capitals, as shown here.
</t>
</section> </section>
</section> </section>
<section numbered="true" toc="default"> <section numbered="true" toc="default" anchor="vlpafsf">
<name>Variable-Length Prefix Attribute Flags Sub-TLV</name> <name>Variable-Length Prefix Extended Flags Sub-TLV</name>
<t>This document defines variable-Length Prefix Attribute Flags sub-TLV for O <t>This document defines a variable-length Prefix Extended Flags sub-TLV for
SPFv2 and OSPFv3. Such sub-TLV specifies the variable-flag fields to advertise a OSPFv2 and OSPFv3. The sub-TLV specifies the variable-length Prefix Extended Fla
dditional attributes associated with OSPF prefixes. The advertisement and proces gs field to advertise additional attributes associated with OSPF prefixes. The a
sing of the existing fixed-size prefix attribute flags remain unchanged.</t> dvertisement and processing of the existing fixed-size prefix flags remain uncha
<t>The format of OSPFv2/OSPFv3 Prefix Attribute Flags sub-TLVs is shown in Fi nged.</t>
gure 1.</t> <t>The format of the OSPFv2/OSPFv3 Prefix Extended Flags sub-TLV is shown in
<figure title="Format of OSPFv2/OSPFv3 Prefix Attribute Flags Sub-TLV"> Figure 1.</t>
<artwork> <figure>
<![CDATA[ <name>Format of OSPFv2/OSPFv3 Prefix Extended Flags Sub-TLV</name>
<artwork><![CDATA[
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | | |
// Prefix Attribute Flags (Variable) // // Prefix Extended Flags (Variable) //
| | | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+]]></artwork>
]]></artwork>
</figure> </figure>
<t>where:</t> <t>where:</t>
<t>Type (2 octets): 11 for OSPFv2 and 37 for OSPFv3.</t> <dl spacing="normal" newline="false">
<t>Length (2 octets): Variable, dependent on the included Prefix Attribute <dt>Type (2 octets):</dt>
Flags. This indicates the length of the prefix attributes flags in octets. The <dd>11 for OSPFv2 and 37 for OSPFv3</dd>
length MUST be a multiple of 4 octets. If the length is not a multiple of 4 octe <dt>Length (2 octets):</dt>
ts, the Link State Advertisement (LSA) is malformed and MUST be ignored.</t> <dd>Variable, dependent on the included Prefix Extended Flags field. This
<t>Prefix Attribute Flags (Variable): The extended flag field. This field indicates the length of the Prefix Extended Flags field in octets. The
contains a variable number of flags, grouped in 4-octet blocks. The bits are num length <bcp14>MUST</bcp14> be a multiple of 4 octets. If the length is
bered starting from bit 0 as the most significant bit of the first 32-bit block. not a multiple of 4 octets, the Link State Advertisement (LSA) is
If a Prefix Attribute Flags field's length exceeds 4 octets, numbering for the malformed and <bcp14>MUST</bcp14> be ignored.</dd>
additional bits picks up where the previous 4-octet block left off. For example, <dt>Prefix Extended Flags (Variable):</dt>
the most significant bit in the fifth octet of an 8-octet Prefix Attribute Flag <dd>The extended flag field. This field contains a variable number of
s is referred to as bit 32. Currently, no bits are defined in this document.</t> flags, grouped in 4-octet blocks. The bits are numbered starting from
<t>Unassigned bits MUST be set to zero on transmission and MUST be ignored bit 0 as the most significant bit of the first 32-bit block. If the lengt
on receipt.</t> h of the
<t>An implementation MUST limit the length of the sub-TLV so as to signal Prefix Extended Flags field exceeds 4 octets, numbering for
the bits that are set to 1. Defined prefix flags that are not transmitted due to the additional bits picks up where the previous 4-octet block left
being beyond the transmitted length MUST be treated as being set to 0.</t> off. For example, the most significant bit in the fifth octet of an
<t>OSPFv2 Prefix Attribute Flags sub-TLV is advertised as a sub-TLV of the 8-octet Prefix Extended Flags field is referred to as bit 32. Currently,
OSPFv2 Extended Prefix TLV defined in <xref target="RFC7684"/>. Additional OSPF no
v2 prefix flags SHOULD be allocated from the unused bits in the Flags field of t bits are defined in this document.</dd>
he OSPFv2 Extended Prefix TLV prior to allocating flags in the OSPFv2 Prefix Att </dl>
ribute Flags sub-TLV.</t> <t>Unassigned bits <bcp14>MUST</bcp14> be set to zero on transmission and
<t>OSPFv3 Prefix Attribute Flags sub-TLV is advertised as a sub-TLV of the <bcp14>MUST</bcp14> be ignored on receipt.</t>
following OSPFv3 TLVs:</t> <t>An implementation <bcp14>MUST</bcp14> limit the length of the sub-TLV s
o as to signal the bits that are set to 1. Defined prefix flags that are not tra
nsmitted due to being beyond the transmitted length <bcp14>MUST</bcp14> be treat
ed as being set to 0.</t>
<t>The OSPFv2 Prefix Extended Flags sub-TLV is advertised as a sub-TLV of
the OSPFv2 Extended Prefix TLV defined in <xref target="RFC7684"/>. Additional O
SPFv2 prefix flags <bcp14>SHOULD</bcp14> be allocated from the unused bits in th
e Flags field of the OSPFv2 Extended Prefix TLV prior to allocating flags in the
OSPFv2 Prefix Extended Flags sub-TLV.</t>
<t>The OSPFv3 Prefix Extended Flags sub-TLV is advertised as a sub-TLV of
the following OSPFv3 TLVs:</t>
<ul spacing="normal"> <ul spacing="normal">
<li>Inter-Area-Prefix TLV (Section 3.4 of <xref target="RFC8362"/>).</li <li>Inter-Area-Prefix TLV (<xref target="RFC8362" sectionFormat="of" sec
> tion="3.4"/>)</li>
<li>External-Prefix TLV (Section 3.6 of <xref target="RFC8362"/>).</li> <li>External-Prefix TLV (<xref target="RFC8362" sectionFormat="of" secti
<li>Intra-Area-Prefix TLV (Section 3.7 of <xref target="RFC8362"/>).</li on="3.6"/>)</li>
> <li>Intra-Area-Prefix TLV (<xref target="RFC8362" sectionFormat="of" sec
<li>SRv6 Locator TLV <xref target="RFC9513"/>.</li> tion="3.7"/>)</li>
<li>SRv6 Locator TLV <xref target="RFC9513"/></li>
</ul> </ul>
<t>When multiple instances of the OSPFv2/OSPFv3 Prefix Attribute Flags sub- TLVs are received within the same TLV, an implementation MUST use only the first occurrence of the sub-TLV and MUST ignore all subsequent instances of the sub-T LV. Errors SHOULD be logged subject to rate limiting.</t> <t>When multiple instances of the OSPFv2/OSPFv3 Prefix Extended Flags sub-T LVs are received within the same TLV, an implementation <bcp14>MUST</bcp14> use only the first occurrence of the sub-TLV and <bcp14>MUST</bcp14> ignore all subs equent instances of the sub-TLV. Errors <bcp14>SHOULD</bcp14> be logged subject to rate limiting.</t>
</section> </section>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>Backward Compatibility</name> <name>Backward Compatibility</name>
<t>The Prefix Attribute Flags sub-TLV does not introduce any backward co mpatibility issues. An implementation that does not recognize the OSPFv2/OSPFv3 Prefix Attribute Flags sub-TLV would ignore the sub-TLV as per normal TLV proces sing operations (refer Section 6.3 of <xref target="RFC3630"/> and Section 2.3.2 of <xref target="RFC8362"/>).</t> <t>The OSPFv2/OSPFv3 Prefix Extended Flags sub-TLV does not introduce an y backward compatibility issues. An implementation that does not recognize the O SPFv2/OSPFv3 Prefix Extended Flags sub-TLV would ignore the sub-TLV as per norma l TLV processing operations (refer to <xref target="RFC3630" sectionFormat="of" section="2.3.2"/> and <xref target="RFC8362" sectionFormat="of" section="6.3"/>) .</t>
</section> </section>
<section anchor="Acknowledgements" numbered="true" toc="default">
<name>Acknowledgements</name>
<t>The authors thank Shraddha Hegde, Changwang Lin, Tom Petch and many oth
ers for their suggestions and comments.</t>
<t>The authors would like to thank Acee Lindem for aligning the terminolog
y with existing OSPF documents and for editorial improvements.</t>
</section>
<!-- Possibly a 'Contributors' section ... -->
<section anchor="IANA" numbered="true" toc="default"> <section anchor="IANA" numbered="true" toc="default">
<name>IANA Considerations</name> <name>IANA Considerations</name>
<t>This document requests allocation for the following registries.</t>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv2</name> <name>OSPFv2</name>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv2 Prefix Attribute Flags Sub-TLV Registry</name> <name>OSPFv2 Prefix Extended Flags Sub-TLV</name>
<t>This document requests IANA to make permanent the early allocation of the <t>IANA has allocated the following codepoint in the "OSPFv2 Extended Prefix
following codepoint for the "OSPFv2 Prefix Attribute Flags" in the "OSPFv2 Exten TLV Sub-TLVs" registry:</t>
ded Prefix TLV Sub-TLVs" registry to be made permanent:</t>
<artwork align="center" name=" " type="" alt=""> <table>
<![CDATA[ <thead>
Value Description Reference <tr><th>Value</th><th>Description</th><th>Reference</th></tr>
11 OSPFv2 Prefix Attribute Flags RFC to be </thead>
]]></artwork> <tbody>
</section> <tr><td>11</td><td>OSPFv2 Prefix Extended Flags</td><td>RFC 9792</td></tr
>
</tbody>
</table>
</section>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv2 Prefix Extended Flags Field Registry</name> <name>OSPFv2 Prefix Extended Flags Registry</name>
<t>This document requests the creation of "OSPFv2 Prefix Extended Flag Fie <t>IANA has created the "OSPFv2 Prefix Extended Flags" registry within the
ld" Registry under "Open Shortest Path First v2 (OSPFv2) Parameters" registry gr "Open Shortest Path First v2 (OSPFv2) Parameters" registry group. The registry
oup. The registry defines the bits in the Prefix Attribute Flags field in the OS defines the bits in the Prefix Extended Flags field in the OSPFv2 Prefix Extende
PFv2 Prefix Attribute Flags sub-TLV as specified in Section 2. The bits are to b d Flags sub-TLV as specified in <xref target="vlpafsf"/>. The bits are to be all
e allocated via IETF Review <xref target="RFC8126"/>. Each bit definition will i ocated via IETF Review <xref target="RFC8126"/>. Each bit definition will includ
nclude:</t> e:</t>
<artwork align="center" name=" " type="" alt=""> <ul spacing="normal">
<![CDATA[ <li>Bit number (counting from bit 0 as the most significant bit of the fi
* Bit number (counting from bit 0 as the most significant rst block)</li>
bit of the first block) <li>Description</li>
* Description <li>Reference</li>
* Reference </ul>
]]></artwork>
<t>No bits are currently defined. Bits 0-31 are to be initially marked as <t>No bits are currently defined. Bits 0-31 are to be initially marked as
"Unassigned". The flags defined in this document may use either a single bit or "Unassigned". The flags defined in this document may use either a single bit or
multiple bits to represent a state, as determined by the specific requirements multiple bits to represent a state, as determined by the specific requirements
of the document defining them. IANA is requested to add subsequent blocks of 32 of the document defining them. IANA will add subsequent blocks of 32 bits upon e
bits upon exhaustion of the preceding 32-bit block.</t> xhaustion of the preceding 32-bit block.</t>
</section> </section>
</section> </section>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv3</name> <name>OSPFv3</name>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv3 Prefix Attribute Flags Sub-TLV Registry</name> <name>OSPFv3 Prefix Extended Flags Sub-TLV</name>
<t>This document requests IANA to make permanent the early allocation of <t>IANA has allocated the following codepoint in the "OSPFv3 Extended-LS
the following codepoint for the "OSPFv3 Prefix Attribute Flags" in the "OSPFv3 A Sub-TLVs" registry:</t>
Extended-LSA sub-TLVs" registry:</t>
<artwork align="center" name=" " type="" alt=""> <table>
<![CDATA[ <thead><tr><th>Value</th>
Value Description Reference <th>Description</th>
37 OSPFv3 Prefix Attribute Flags RFC to be <th>L2BM</th>
]]></artwork> <th>Reference</th></tr></thead>
</section> <tbody><tr>
<td>37</td>
<td>OSPFv3 Prefix Extended Flags</td>
<td align="center">X</td>
<td>RFC 9792</td></tr></tbody>
</table>
</section>
<section numbered="true" toc="default"> <section numbered="true" toc="default">
<name>OSPFv3 Prefix Extended Flags Field Registry</name> <name>OSPFv3 Prefix Extended Flags Registry</name>
<t>This document requests the creation of "OSPFv3 Prefix Extended Flag Fie <t>IANA has created the "OSPFv3 Prefix Extended Flags" registry within the
ld" registry under "Open Shortest Path First v3 (OSPFv3)" registry group. The re "Open Shortest Path First v3 (OSPFv3) Parameters" registry group. The registry
gistry defines the bits in the Prefix Attribute Flags field in the OSPFv2 Prefix defines the bits in the Prefix Extended Flags field in the OSPFv2 Prefix Extende
Attribute Flags sub-TLV as specified in Section 2. The bits are to be allocated d Flags sub-TLV as specified in <xref target="vlpafsf"/>. The bits are to be all
via IETF Review <xref target="RFC8126"/>. Each bit definition will include:</t> ocated via IETF Review <xref target="RFC8126"/>. Each bit definition will includ
<artwork align="center" name=" " type="" alt=""> e:</t>
<![CDATA[ <ul spacing="normal">
* Bit number (counting from bit 0 as the most significant <li>Bit number (counting from bit 0 as the most significant bit of the fi
bit of the first block ) rst block)</li>
* Description <li>Description</li>
* Reference <li>Reference</li>
]]></artwork> </ul>
<t>No bits are currently defined. Bits 0-31 are to be initially marked as <t>No bits are currently defined. Bits 0-31 are to be initially marked as
"Unassigned". The flags defined in this document may use either a single bit or "Unassigned". The flags defined in this document may use either a single bit or
multiple bits to represent a state, as determined by the specific requirements multiple bits to represent a state, as determined by the specific requirements
of the document defining them. IANA is requested to add subsequent blocks of 32 of the document defining them. IANA will add subsequent blocks of 32 bits upon e
bits upon exhaustion of the preceding 32-bit block. </t> xhaustion of the preceding 32-bit block. </t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="Security" numbered="true" toc="default"> <section anchor="Security" numbered="true" toc="default">
<name>Security Considerations</name> <name>Security Considerations</name>
<t>Procedures and protocol extensions defined in this document do not affec t the OSPFv2 or OSPFv3 security models. See the "Security Considerations" Sectio n of <xref target="RFC7684" format="default"></xref> for a discussion of OSPFv2 TLV-encoding considerations, and the "Security Considerations" Section of <xref target="RFC8362" format="default"></xref> for a discussion of OSPFv3 security.</ t> <t>Procedures and protocol extensions defined in this document do not affec t the OSPFv2 or OSPFv3 security models. See <xref target="RFC7684" sectionForma t="of" section="5"/> for a discussion of OSPFv2 TLV-encoding considerations and <xref target="RFC8362" sectionFormat="of" section="7"/> for a discussion of OSPF v3 security.</t>
</section> </section>
</middle> </middle>
<!-- *****BACK MATTER ***** -->
<back> <back>
<references> <references>
<name>References</name> <name>References</name>
<references> <references>
<name>Normative References</name> <name>Normative References</name>
&RFC2119; <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.211
&RFC3630; 9.xml"/>
&RFC5340; <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.363
&RFC7684; 0.xml"/>
&RFC8126; <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.534
&RFC8174; 0.xml"/>
&RFC8362; <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.768
&RFC9513; 4.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.812
6.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.817
4.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.836
2.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.951
3.xml"/>
</references> </references>
<references> <references>
<name>Informative References</name> <name>Informative References</name>
<reference anchor="IANA-OSPFv2-EPF" target="https://www.iana.org/assign ments/ospfv2-parameters/ospfv2-parameters.xhtml#extended-prefix-tlv-flags"> <reference anchor="IANA-OSPFv2-EPF" target="https://www.iana.org/assign ments/ospfv2-parameters">
<front> <front>
<title>OSPFv2 Extended Prefix TLV Flags</title> <title>OSPFv2 Extended Prefix TLV Flags</title>
<author> <author>
<organization></organization> <organization>IANA</organization>
</author> </author>
</front> </front>
</reference> </reference>
<reference anchor="IANA-OSPFv3-PO" target="https://www.iana.org/assignm
ents/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-4"> <reference anchor="IANA-OSPFv3-PO" target="https://www.iana.org/assignm
ents/ospfv3-parameters">
<front> <front>
<title>OSPFv3 Prefix Options (8 bits)</title> <title>OSPFv3 Prefix Options (8 bits)</title>
<author> <author>
<organization></organization> <organization>IANA</organization>
</author> </author>
</front> </front>
</reference> </reference>
</references> </references>
</references> </references>
<section anchor="Acknowledgements" numbered="false" toc="default">
<name>Acknowledgements</name>
<t>The authors would like to thank <contact fullname="Shraddha Hegde"/>, <
contact fullname="Changwang Lin"/>, <contact fullname="Tom Petch"/>, and many ot
hers for their suggestions and comments.</t>
<t>The authors would also like to thank <contact fullname="Acee Lindem"/>
for aligning the terminology with existing OSPF documents and for editorial impr
ovements.</t>
</section>
</back> </back>
</rfc> </rfc>
 End of changes. 43 change blocks. 
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