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<title>RFC 9069: Support for Local RIB in the BGP Monitoring Protocol (BMP)</title>
<meta content="Tim Evens" name="author">
<meta content="Serpil Bayraktar" name="author">
<meta content="Manish Bhardwaj" name="author">
<meta content="Paolo Lucente" name="author">
<meta content="
The BGP Monitoring Protocol (BMP) defines access to local Routing
Information Bases (RIBs). This document updates BMP (RFC 7854) by
adding access to the Local Routing Information Base (Loc-RIB), as
defined in RFC 4271. The Loc-RIB contains the routes that have been
selected by the local BGP speaker's Decision Process.
" name="description">
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<meta content="BGP" name="keyword">
<meta content="BMP" name="keyword">
<meta content="local-rib" name="keyword">
<meta content="loc-rib" name="keyword">
<meta content="9069" name="rfc.number">
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<link href="rfc-local.css" rel="stylesheet" type="text/css">
<link href="https://dx.doi.org/10.17487/rfc9069" rel="alternate">
<link href="urn:issn:2070-1721" rel="alternate">
<link href="https://datatracker.ietf.org/doc/draft-ietf-grow-bmp-local-rib-12" rel="prev">
</head>
<body>
<script src="https://www.rfc-editor.org/js/metadata.min.js"></script>
<table class="ears">
<thead><tr>
<td class="left">RFC 9069</td>
<td class="center">BMP Loc-RIB</td>
<td class="right">February 2022</td>
</tr></thead>
<tfoot><tr>
<td class="left">Evens, et al.</td>
<td class="center">Standards Track</td>
<td class="right">[Page]</td>
</tr></tfoot>
</table>
<div id="external-metadata" class="document-information"></div>
<div id="internal-metadata" class="document-information">
<dl id="identifiers">
<dt class="label-stream">Stream:</dt>
<dd class="stream">Internet Engineering Task Force (IETF)</dd>
<dt class="label-rfc">RFC:</dt>
<dd class="rfc"><a href="https://www.rfc-editor.org/rfc/rfc9069" class="eref">9069</a></dd>
<dt class="label-updates">Updates:</dt>
<dd class="updates">
<a href="https://www.rfc-editor.org/rfc/rfc7854" class="eref">7854</a> </dd>
<dt class="label-category">Category:</dt>
<dd class="category">Standards Track</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2022-02" class="published">February 2022</time>
</dd>
<dt class="label-issn">ISSN:</dt>
<dd class="issn">2070-1721</dd>
<dt class="label-authors">Authors:</dt>
<dd class="authors">
<div class="author">
<div class="author-name">T. Evens</div>
<div class="org">Cisco Systems</div>
</div>
<div class="author">
<div class="author-name">S. Bayraktar</div>
<div class="org">Menlo Security</div>
</div>
<div class="author">
<div class="author-name">M. Bhardwaj</div>
<div class="org">Cisco Systems</div>
</div>
<div class="author">
<div class="author-name">P. Lucente</div>
<div class="org">NTT Communications</div>
</div>
</dd>
</dl>
</div>
<h1 id="rfcnum">RFC 9069</h1>
<h1 id="title">Support for Local RIB in the BGP Monitoring Protocol (BMP)</h1>
<section id="section-abstract">
<h2 id="abstract"><a href="#abstract" class="selfRef">Abstract</a></h2>
<p id="section-abstract-1">
The BGP Monitoring Protocol (BMP) defines access to local Routing
Information Bases (RIBs). This document updates BMP (RFC 7854) by
adding access to the Local Routing Information Base (Loc-RIB), as
defined in RFC 4271. The Loc-RIB contains the routes that have been
selected by the local BGP speaker's Decision Process.<a href="#section-abstract-1" class="pilcrow">¶</a></p>
</section>
<div id="status-of-memo">
<section id="section-boilerplate.1">
<h2 id="name-status-of-this-memo">
<a href="#name-status-of-this-memo" class="section-name selfRef">Status of This Memo</a>
</h2>
<p id="section-boilerplate.1-1">
This is an Internet Standards Track document.<a href="#section-boilerplate.1-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-2">
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by
the Internet Engineering Steering Group (IESG). Further
information on Internet Standards is available in Section 2 of
RFC 7841.<a href="#section-boilerplate.1-2" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-3">
Information about the current status of this document, any
errata, and how to provide feedback on it may be obtained at
<span><a href="https://www.rfc-editor.org/info/rfc9069">https://www.rfc-editor.org/info/rfc9069</a></span>.<a href="#section-boilerplate.1-3" class="pilcrow">¶</a></p>
</section>
</div>
<div id="copyright">
<section id="section-boilerplate.2">
<h2 id="name-copyright-notice">
<a href="#name-copyright-notice" class="section-name selfRef">Copyright Notice</a>
</h2>
<p id="section-boilerplate.2-1">
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.<a href="#section-boilerplate.2-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.2-2">
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(<span><a href="https://trustee.ietf.org/license-info">https://trustee.ietf.org/license-info</a></span>) 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 Revised BSD License text as described in
Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Revised BSD License.<a href="#section-boilerplate.2-2" class="pilcrow">¶</a></p>
</section>
</div>
<div id="toc">
<section id="section-toc.1">
<a href="#" onclick="scroll(0,0)" class="toplink">▲</a><h2 id="name-table-of-contents">
<a href="#name-table-of-contents" class="section-name selfRef">Table of Contents</a>
</h2>
<nav class="toc"><ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.1">
<p id="section-toc.1-1.1.1" class="keepWithNext"><a href="#section-1" class="xref">1</a>. <a href="#name-introduction" class="xref">Introduction</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.1.2.1">
<p id="section-toc.1-1.1.2.1.1" class="keepWithNext"><a href="#section-1.1" class="xref">1.1</a>. <a href="#name-alternative-method-to-monit" class="xref">Alternative Method to Monitor Loc-RIB</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.2">
<p id="section-toc.1-1.2.1" class="keepWithNext"><a href="#section-2" class="xref">2</a>. <a href="#name-terminology" class="xref">Terminology</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.3">
<p id="section-toc.1-1.3.1"><a href="#section-3" class="xref">3</a>. <a href="#name-definitions" class="xref">Definitions</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.4">
<p id="section-toc.1-1.4.1"><a href="#section-4" class="xref">4</a>. <a href="#name-per-peer-header" class="xref">Per-Peer Header</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.4.2.1">
<p id="section-toc.1-1.4.2.1.1"><a href="#section-4.1" class="xref">4.1</a>. <a href="#name-peer-type" class="xref">Peer Type</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.4.2.2">
<p id="section-toc.1-1.4.2.2.1"><a href="#section-4.2" class="xref">4.2</a>. <a href="#name-peer-flags" class="xref">Peer Flags</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5">
<p id="section-toc.1-1.5.1"><a href="#section-5" class="xref">5</a>. <a href="#name-loc-rib-monitoring" class="xref">Loc-RIB Monitoring</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.1">
<p id="section-toc.1-1.5.2.1.1"><a href="#section-5.1" class="xref">5.1</a>. <a href="#name-per-peer-header-2" class="xref">Per-Peer Header</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.2">
<p id="section-toc.1-1.5.2.2.1"><a href="#section-5.2" class="xref">5.2</a>. <a href="#name-peer-up-notification" class="xref">Peer Up Notification</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.2.2.1">
<p id="section-toc.1-1.5.2.2.2.1.1"><a href="#section-5.2.1" class="xref">5.2.1</a>. <a href="#name-peer-up-information" class="xref">Peer Up Information</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.3">
<p id="section-toc.1-1.5.2.3.1"><a href="#section-5.3" class="xref">5.3</a>. <a href="#name-peer-down-notification" class="xref">Peer Down Notification</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.4">
<p id="section-toc.1-1.5.2.4.1"><a href="#section-5.4" class="xref">5.4</a>. <a href="#name-route-monitoring" class="xref">Route Monitoring</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.4.2.1">
<p id="section-toc.1-1.5.2.4.2.1.1"><a href="#section-5.4.1" class="xref">5.4.1</a>. <a href="#name-asn-encoding" class="xref">ASN Encoding</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.4.2.2">
<p id="section-toc.1-1.5.2.4.2.2.1"><a href="#section-5.4.2" class="xref">5.4.2</a>. <a href="#name-granularity" class="xref">Granularity</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.5">
<p id="section-toc.1-1.5.2.5.1"><a href="#section-5.5" class="xref">5.5</a>. <a href="#name-route-mirroring" class="xref">Route Mirroring</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.6">
<p id="section-toc.1-1.5.2.6.1"><a href="#section-5.6" class="xref">5.6</a>. <a href="#name-statistics-report" class="xref">Statistics Report</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6">
<p id="section-toc.1-1.6.1"><a href="#section-6" class="xref">6</a>. <a href="#name-other-considerations" class="xref">Other Considerations</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.1">
<p id="section-toc.1-1.6.2.1.1"><a href="#section-6.1" class="xref">6.1</a>. <a href="#name-loc-rib-implementation" class="xref">Loc-RIB Implementation</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.1.2.1">
<p id="section-toc.1-1.6.2.1.2.1.1"><a href="#section-6.1.1" class="xref">6.1.1</a>. <a href="#name-multiple-loc-rib-peers" class="xref">Multiple Loc-RIB Peers</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.1.2.2">
<p id="section-toc.1-1.6.2.1.2.2.1"><a href="#section-6.1.2" class="xref">6.1.2</a>. <a href="#name-filtering-loc-rib-to-bmp-re" class="xref">Filtering Loc-RIB to BMP Receivers</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.1.2.3">
<p id="section-toc.1-1.6.2.1.2.3.1"><a href="#section-6.1.3" class="xref">6.1.3</a>. <a href="#name-changes-to-existing-bmp-ses" class="xref">Changes to Existing BMP Sessions</a></p>
</li>
</ul>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.7">
<p id="section-toc.1-1.7.1"><a href="#section-7" class="xref">7</a>. <a href="#name-security-considerations" class="xref">Security Considerations</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8">
<p id="section-toc.1-1.8.1"><a href="#section-8" class="xref">8</a>. <a href="#name-iana-considerations" class="xref">IANA Considerations</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8.2.1">
<p id="section-toc.1-1.8.2.1.1"><a href="#section-8.1" class="xref">8.1</a>. <a href="#name-bmp-peer-type" class="xref">BMP Peer Type</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8.2.2">
<p id="section-toc.1-1.8.2.2.1"><a href="#section-8.2" class="xref">8.2</a>. <a href="#name-bmp-loc-rib-instance-peer-f" class="xref">BMP Loc-RIB Instance Peer Flags</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8.2.3">
<p id="section-toc.1-1.8.2.3.1"><a href="#section-8.3" class="xref">8.3</a>. <a href="#name-peer-up-information-tlv" class="xref">Peer Up Information TLV</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8.2.4">
<p id="section-toc.1-1.8.2.4.1"><a href="#section-8.4" class="xref">8.4</a>. <a href="#name-peer-down-reason-code" class="xref">Peer Down Reason Code</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.8.2.5">
<p id="section-toc.1-1.8.2.5.1"><a href="#section-8.5" class="xref">8.5</a>. <a href="#name-deprecated-entries" class="xref">Deprecated Entries</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.9">
<p id="section-toc.1-1.9.1"><a href="#section-9" class="xref">9</a>. <a href="#name-references" class="xref">References</a></p>
<ul class="compact toc ulBare ulEmpty">
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.9.2.1">
<p id="section-toc.1-1.9.2.1.1"><a href="#section-9.1" class="xref">9.1</a>. <a href="#name-normative-references" class="xref">Normative References</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.9.2.2">
<p id="section-toc.1-1.9.2.2.1"><a href="#section-9.2" class="xref">9.2</a>. <a href="#name-informative-references" class="xref">Informative References</a></p>
</li>
</ul>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.10">
<p id="section-toc.1-1.10.1"><a href="#appendix-A" class="xref"></a><a href="#name-acknowledgements" class="xref">Acknowledgements</a></p>
</li>
<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.11">
<p id="section-toc.1-1.11.1"><a href="#appendix-B" class="xref"></a><a href="#name-authors-addresses" class="xref">Authors' Addresses</a></p>
</li>
</ul>
</nav>
</section>
</div>
<div id="Introduction">
<section id="section-1">
<h2 id="name-introduction">
<a href="#section-1" class="section-number selfRef">1. </a><a href="#name-introduction" class="section-name selfRef">Introduction</a>
</h2>
<p id="section-1-1">
This document defines a mechanism to monitor the BGP Loc-RIB state
of remote BGP instances without the need to establish BGP peering
sessions.
BMP <span>[<a href="#RFC7854" class="xref">RFC7854</a>]</span> does not define a method to send
the BGP instance Loc-RIB.
It does define locally originated routes in <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-8.2" class="relref">Section 8.2</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span>,
but these routes are defined as the routes that originated into BGP (e.g.,
<span><a href="https://www.rfc-editor.org/rfc/rfc4271#section-9.4" class="relref">Section 9.4</a> of [<a href="#RFC4271" class="xref">RFC4271</a>]</span>). Loc-RIB
includes all selected received routes from BGP peers in addition to locally
originated routes.<a href="#section-1-1" class="pilcrow">¶</a></p>
<p id="section-1-2">
<a href="#FigAdjRibInLocRib" class="xref">Figure 1</a> shows the flow of received routes from one or more BGP peers
into the Loc-RIB.<a href="#section-1-2" class="pilcrow">¶</a></p>
<span id="name-bgp-peering-adj-ribs-in-int"></span><div id="FigAdjRibInLocRib">
<figure id="figure-1">
<div class="alignCenter art-text artwork" id="section-1-3.1">
<pre>
+------------------+ +------------------+
| Peer-A | | Peer-B |
/-- | | ---- | | --\
| | Adj-RIB-In (Pre) | | Adj-RIB-In (Pre) | |
| +------------------+ +------------------+ |
| | | |
| Filters/Policy -| Filters/Policy -| |
| V V |
| +------------------+ +------------------+ |
| | Adj-RIB-In (Post)| | Adj-RIB-In (Post)| |
| +------------------+ +------------------+ |
| | | |
| Selected -| Selected -| |
| V V |
| +-----------------------------------------+ |
| | Loc-RIB | |
| +-----------------------------------------+ |
| |
| ROUTER/BGP Instance |
\----------------------------------------------------/
</pre>
</div>
<figcaption><a href="#figure-1" class="selfRef">Figure 1</a>:
<a href="#name-bgp-peering-adj-ribs-in-int" class="selfRef">BGP Peering Adj-RIBs-In into Loc-RIB</a>
</figcaption></figure>
</div>
<p id="section-1-4">
The following are some use cases for Loc-RIB access:<a href="#section-1-4" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-1-5.1">
<p id="section-1-5.1.1">
The Adj-RIB-In for a given peer post-policy may contain hundreds of
thousands of routes, with only a handful of routes selected and installed
in the Loc-RIB after best-path selection.
Some monitoring applications, such as those that need only to
correlate flow records to Loc-RIB entries, only need to collect
and monitor the routes that are actually selected and used.<a href="#section-1-5.1.1" class="pilcrow">¶</a></p>
<p id="section-1-5.1.2">
Requiring the applications to collect all Adj-RIB-In post-policy
data forces the applications to receive a potentially
large unwanted data set and to perform the BGP decision process
selection, which includes having access to the interior gateway
protocol (IGP) next-hop metrics. While it is possible to obtain
the IGP topology information using BGP - Link State (BGP-LS),
it requires the application to implement Shortest Path First (SPF)
and possibly Constrained Shortest Path First (CSPF) based on
additional policies. This is overly complex for such a
simple application that only needs to have access to the Loc-RIB.<a href="#section-1-5.1.2" class="pilcrow">¶</a></p>
</li>
<li class="normal" id="section-1-5.2">
It is common to see frequent changes over many BGP peers, but
those changes do not always result in the router's Loc-RIB
changing. The change in the Loc-RIB can have a direct impact
on the forwarding state. It can greatly reduce the time to
troubleshoot and resolve issues if operators have the history of
Loc-RIB changes. For example, a performance issue might have
been seen for only a duration of 5 minutes. Post-facto
troubleshooting this issue without Loc-RIB history hides any
decision-based routing changes that might have happened during
those 5 minutes.<a href="#section-1-5.2" class="pilcrow">¶</a>
</li>
<li class="normal" id="section-1-5.3">
Operators may wish to validate the impact of policies applied
to the Adj-RIB-In by analyzing the final decision made by the
router when installing into the Loc-RIB. For example, in order
to validate if multipath prefixes are installed as expected
for all advertising peers, the Adj-RIB-In post-policy and Loc-RIB
need to be compared. This is only possible if the Loc-RIB
is available. Monitoring the Adj-RIB-In for this router from
another router to derive the Loc-RIB is likely to not show the same
installed prefixes. For example, the received Adj-RIB-In will
be different if ADD-PATH <span>[<a href="#RFC7911" class="xref">RFC7911</a>]</span>
is not enabled or if the maximum supported number of equal paths is different
between Loc-RIB and advertised routes.<a href="#section-1-5.3" class="pilcrow">¶</a>
</li>
</ul>
<p id="section-1-6">
This document adds Loc-RIB to the BGP Monitoring Protocol and
replaces <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-8.2" class="relref">Section 8.2</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> ("Locally Originated Routes").<a href="#section-1-6" class="pilcrow">¶</a></p>
<section id="section-1.1">
<h3 id="name-alternative-method-to-monit">
<a href="#section-1.1" class="section-number selfRef">1.1. </a><a href="#name-alternative-method-to-monit" class="section-name selfRef">Alternative Method to Monitor Loc-RIB</a>
</h3>
<p id="section-1.1-1">
Loc-RIB is used to build Adj-RIB-Out when advertising routes to a
peer. It is therefore possible to derive the Loc-RIB of a router by
monitoring the Adj-RIB-In pre-policy from another router.
This becomes overly complex and error prone when considering the number
of peers being monitored per router.<a href="#section-1.1-1" class="pilcrow">¶</a></p>
<p id="section-1.1-2"></p>
<span id="name-alternative-method-to-monito"></span><div id="FigCurLocRibMon">
<figure id="figure-2">
<div class="alignCenter art-text artwork" id="section-1.1-3.1">
<pre>
/------------------------------------------------------\
| ROUTER1 BGP Instance |
| |
| +--------------------------------------------+ |
| | Loc-RIB | |
| +--------------------------------------------+ |
| | | |
| +------------------+ +------------------+ |
| | Peer-ROUTER2 | | Peer-ROUTER3 | |
| | Adj-RIB-Out (Pre)| | Adj-RIB-Out (Pre)| |
| +------------------+ +------------------+ |
| Filters/Policy -| Filters/Policy -| |
| V V |
| +-------------------+ +-------------------+ |
| | Adj-RIB-Out (Post)| | Adj-RIB-Out (Post)| |
| +-------------------+ +-------------------+ |
| | | |
\------------- | ------------------------ | -----------/
BGP | BGP |
Peer | Peer |
+------------------+ +------------------+
| Peer-ROUTER1 | | Peer-ROUTER1 |
/--| |--\ /--| | --\
| | Adj-RIB-In (Pre) | | | | Adj-RIB-In (Pre) | |
| +------------------+ | | +------------------+ |
| | | |
| ROUTER2/BGP Instance | | ROUTER3/BGP Instance |
\------------------------/ \-------------------------/
| |
v v
ROUTER2 BMP Feed ROUTER3 BMP Feed
</pre>
</div>
<figcaption><a href="#figure-2" class="selfRef">Figure 2</a>:
<a href="#name-alternative-method-to-monito" class="selfRef">Alternative Method to Monitor Loc-RIB</a>
</figcaption></figure>
</div>
<p id="section-1.1-4">
The setup needed to monitor the Loc-RIB of a router requires another
router with a peering session to the target router that is to be
monitored. As shown in <a href="#FigCurLocRibMon" class="xref">Figure 2</a>, the
target router Loc-RIB is advertised via the Adj-RIB-Out
to the BMP router over a standard BGP peering session. The BMP
router then forwards the Adj-RIB-In pre-policy to the BMP receiver.<a href="#section-1.1-4" class="pilcrow">¶</a></p>
<p id="section-1.1-5">
A BMP lacking access to Loc-RIB introduces the need for additional
resources:<a href="#section-1.1-5" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-1.1-6.1">
Requires at least two routers when only one router was to be
monitored.<a href="#section-1.1-6.1" class="pilcrow">¶</a>
</li>
<li class="normal" id="section-1.1-6.2">
Requires additional BGP peering to collect the received updates
when peering may not have even been required in the first
place. For example, virtual routing and forwarding (VRF) tables
with no peers, redistributed BGP-LS with no peers, and
segment routing egress peer engineering where no
peers have link-state address family enabled are all
situations with no preexisting BGP peers.<a href="#section-1.1-6.2" class="pilcrow">¶</a>
</li>
</ul>
<p id="section-1.1-7">
Many complexities are introduced when using a received Adj-RIB-In
to infer a router Loc-RIB:<a href="#section-1.1-7" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-1.1-8.1">
Adj-RIB-Out received as Adj-RIB-In from another router may have
a policy applied that generates aggregates, suppresses
more specific prefixes, manipulates attributes, or filters routes. Not
only does this invalidate the Loc-RIB view, it adds complexity
when multiple BMP routers may have peering sessions to the same
router. The BMP receiver user is left with the error-prone task of
identifying which peering session is the best representative of
the Loc-RIB.<a href="#section-1.1-8.1" class="pilcrow">¶</a>
</li>
<li class="normal" id="section-1.1-8.2">
BGP peering is designed to work between administrative domains
and therefore does not need to include internal system-level
information of each peering router (e.g., the system name or
version information). In order to derive the Loc-RIB of a router,
the router name or other system information is needed. The BMP
receiver and user are forced to do some type of correlation using
whatever information is available in the peering session (e.g., peering
addresses, autonomous system numbers, and BGP identifiers).
This leads to error-prone correlations.<a href="#section-1.1-8.2" class="pilcrow">¶</a>
</li>
<li class="normal" id="section-1.1-8.3">
Correlating BGP identifiers (BGP-ID) and session addresses to a
router requires additional data, such as router inventory. This
additional data provides the BMP receiver the ability to map and
correlate the BGP-IDs and/or session addresses but requires the
BMP receiver to somehow obtain this data outside of the BMP. How this
data is obtained and the accuracy of the data directly affect the
integrity of the correlation.<a href="#section-1.1-8.3" class="pilcrow">¶</a>
</li>
</ul>
</section>
</section>
</div>
<section id="section-2">
<h2 id="name-terminology">
<a href="#section-2" class="section-number selfRef">2. </a><a href="#name-terminology" class="section-name selfRef">Terminology</a>
</h2>
<p id="section-2-1">
The key words "<span class="bcp14">MUST</span>", "<span class="bcp14">MUST NOT</span>", "<span class="bcp14">REQUIRED</span>", "<span class="bcp14">SHALL</span>", "<span class="bcp14">SHALL NOT</span>", "<span class="bcp14">SHOULD</span>", "<span class="bcp14">SHOULD NOT</span>", "<span class="bcp14">RECOMMENDED</span>", "<span class="bcp14">NOT RECOMMENDED</span>",
"<span class="bcp14">MAY</span>", and "<span class="bcp14">OPTIONAL</span>" in this document are to be interpreted as
described in BCP 14 <span><a href="#RFC2119" class="xref">RFC 2119</a> [<a href="#RFC2119" class="xref">RFC2119</a>]</span>
<span><a href="#RFC8174" class="xref">RFC 8174</a> [<a href="#RFC8174" class="xref">RFC8174</a>]</span> when, and only when, they
appear in all capitals, as shown here.<a href="#section-2-1" class="pilcrow">¶</a></p>
</section>
<section id="section-3">
<h2 id="name-definitions">
<a href="#section-3" class="section-number selfRef">3. </a><a href="#name-definitions" class="section-name selfRef">Definitions</a>
</h2>
<span class="break"></span><dl class="dlParallel" id="section-3-1">
<dt id="section-3-1.1">BGP Instance:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.2">Refers to an instance of BGP-4 <span>[<a href="#RFC4271" class="xref">RFC4271</a>]</span>,
and considerations in <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-8.1" class="relref">Section 8.1</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> apply to it.<a href="#section-3-1.2" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-3-1.3">Adj-RIB-In:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.4">As defined in <span>[<a href="#RFC4271" class="xref">RFC4271</a>]</span>, "The Adj-RIBs-In contains
unprocessed routing information that has been advertised to the
local BGP speaker by its peers." This is also referred to as the
"pre-policy Adj-RIB-In" in this document.<a href="#section-3-1.4" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-3-1.5">
Adj-RIB-Out:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.6">As defined in <span>[<a href="#RFC4271" class="xref">RFC4271</a>]</span>, "The Adj-RIBs-Out contains
the routes for advertisement to specific peers by means of the
local speaker's UPDATE messages."<a href="#section-3-1.6" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-3-1.7">
Loc-RIB:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.8">As defined in <span><a href="https://www.rfc-editor.org/rfc/rfc4271#section-1.1" class="relref">Section 1.1</a> of [<a href="#RFC4271" class="xref">RFC4271</a>]</span>, "The Loc-RIB
contains the routes that have been selected by the local BGP speaker's Decision
Process." Note that the Loc-RIB state as monitored through BMP might
also contain routes imported from other routing protocols such as an IGP
or local static routes.<a href="#section-3-1.8" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-3-1.9">
Pre-Policy Adj-RIB-Out:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.10">The result before applying the outbound
policy to an Adj-RIB-Out. This normally represents a similar view of the
Loc-RIB but may contain additional routes based on BGP peering configuration.<a href="#section-3-1.10" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-3-1.11">
Post-Policy Adj-RIB-Out:</dt>
<dd style="margin-left: 1.5em" id="section-3-1.12"> The result of applying the outbound policy to
an Adj-RIB-Out. This <span class="bcp14">MUST</span> be what is actually sent to the peer.<a href="#section-3-1.12" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
</dl>
</section>
<section id="section-4">
<h2 id="name-per-peer-header">
<a href="#section-4" class="section-number selfRef">4. </a><a href="#name-per-peer-header" class="section-name selfRef">Per-Peer Header</a>
</h2>
<div id="PeerType">
<section id="section-4.1">
<h3 id="name-peer-type">
<a href="#section-4.1" class="section-number selfRef">4.1. </a><a href="#name-peer-type" class="section-name selfRef">Peer Type</a>
</h3>
<p id="section-4.1-1">
A new peer type is defined for Loc-RIB to indicate that it
represents the router Loc-RIB, which may have a route distinguisher (RD).
<span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.2" class="relref">Section 4.2</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> defines a Local Instance
Peer type, which is for the case of non-RD peers that have an instance
identifier.<a href="#section-4.1-1" class="pilcrow">¶</a></p>
<p id="section-4.1-2">
This document defines the following new peer type:<a href="#section-4.1-2" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-4.1-3.1">Peer Type = 3: Loc-RIB Instance Peer<a href="#section-4.1-3.1" class="pilcrow">¶</a>
</li>
</ul>
</section>
</div>
<div id="PeerFlags">
<section id="section-4.2">
<h3 id="name-peer-flags">
<a href="#section-4.2" class="section-number selfRef">4.2. </a><a href="#name-peer-flags" class="section-name selfRef">Peer Flags</a>
</h3>
<p id="section-4.2-1">
If locally sourced routes are communicated
using BMP, they <span class="bcp14">MUST</span> be conveyed using the Loc-RIB Instance Peer Type.<a href="#section-4.2-1" class="pilcrow">¶</a></p>
<p id="section-4.2-2">
The per-peer header flags for the Loc-RIB Instance Peer Type are defined
as follows:<a href="#section-4.2-2" class="pilcrow">¶</a></p>
<div class="alignCenter art-text artwork" id="section-4.2-3">
<pre>
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|F| | | | | | | |
+-+-+-+-+-+-+-+-+
</pre><a href="#section-4.2-3" class="pilcrow">¶</a>
</div>
<ul class="normal">
<li class="normal" id="section-4.2-4.1">
<p id="section-4.2-4.1.1">
The F flag indicates that the Loc-RIB is filtered. This <span class="bcp14">MUST</span> be
set when a filter is applied to Loc-RIB routes sent to the BMP
collector.<a href="#section-4.2-4.1.1" class="pilcrow">¶</a></p>
<p id="section-4.2-4.1.2">
The unused bits are reserved for future use. They <span class="bcp14">MUST</span> be
transmitted as 0, and their values <span class="bcp14">MUST</span> be ignored on receipt.<a href="#section-4.2-4.1.2" class="pilcrow">¶</a></p>
</li>
</ul>
</section>
</div>
</section>
<section id="section-5">
<h2 id="name-loc-rib-monitoring">
<a href="#section-5" class="section-number selfRef">5. </a><a href="#name-loc-rib-monitoring" class="section-name selfRef">Loc-RIB Monitoring</a>
</h2>
<p id="section-5-1">
The Loc-RIB contains all routes selected by the BGP Decision Process as
described in <span><a href="https://www.rfc-editor.org/rfc/rfc4271#section-9.1" class="relref">Section 9.1</a> of [<a href="#RFC4271" class="xref">RFC4271</a>]</span>. These
routes include those learned from BGP peers via its Adj-RIBs-In post-policy, as
well as routes learned by other means as per <span><a href="https://www.rfc-editor.org/rfc/rfc4271#section-9.4" class="relref">Section 9.4</a> of [<a href="#RFC4271" class="xref">RFC4271</a>]</span>.
Examples of these include redistribution of routes from other protocols into BGP
or those otherwise locally originated (i.e., aggregate routes).<a href="#section-5-1" class="pilcrow">¶</a></p>
<p id="section-5-2">
As described in <a href="#FilterLocRib" class="xref">Section 6.1.2</a>, a subset of Loc-RIB routes
<span class="bcp14">MAY</span> be sent to a BMP collector by setting the F flag.<a href="#section-5-2" class="pilcrow">¶</a></p>
<section id="section-5.1">
<h3 id="name-per-peer-header-2">
<a href="#section-5.1" class="section-number selfRef">5.1. </a><a href="#name-per-peer-header-2" class="section-name selfRef">Per-Peer Header</a>
</h3>
<p id="section-5.1-1">
All peer messages that include a per-peer header as defined in
<span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.2" class="relref">Section 4.2</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span>
<span class="bcp14">MUST</span> use the following values:<a href="#section-5.1-1" class="pilcrow">¶</a></p>
<span class="break"></span><dl class="dlParallel" id="section-5.1-2">
<dt id="section-5.1-2.1">
Peer Type:</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.2">Set to 3 to indicate Loc-RIB Instance Peer.<a href="#section-5.1-2.2" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.1-2.3">
Peer Distinguisher:</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.4">Zero-filled if the Loc-RIB represents the
global instance. Otherwise, set to the route distinguisher or
unique locally defined value of the particular instance to which the Loc-RIB belongs.<a href="#section-5.1-2.4" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.1-2.5">
Peer Address:</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.6"> Zero-filled. The remote peer address is not applicable.
The V flag is not applicable with the Loc-RIB Instance Peer Type
considering addresses are zero-filled.<a href="#section-5.1-2.6" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.1-2.7">
Peer Autonomous System (AS):</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.8">Set to the primary router BGP autonomous system number (ASN).<a href="#section-5.1-2.8" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.1-2.9">
Peer BGP ID:</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.10"> Set the ID to the router-id of the VRF instance if VRF is used; otherwise, set to the global instance router-id.<a href="#section-5.1-2.10" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.1-2.11">
Timestamp:</dt>
<dd style="margin-left: 1.5em" id="section-5.1-2.12">The time when the encapsulated routes were installed in
the Loc-RIB, expressed in seconds and microseconds since midnight
(zero hour), January 1, 1970 (UTC). If zero, the time is unavailable.
Precision of the timestamp is implementation dependent.<a href="#section-5.1-2.12" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
</dl>
</section>
<div id="PeerUpNotify">
<section id="section-5.2">
<h3 id="name-peer-up-notification">
<a href="#section-5.2" class="section-number selfRef">5.2. </a><a href="#name-peer-up-notification" class="section-name selfRef">Peer Up Notification</a>
</h3>
<p id="section-5.2-1">
Peer Up notifications follow <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.10" class="relref">Section 4.10</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> with the
following clarifications:<a href="#section-5.2-1" class="pilcrow">¶</a></p>
<span class="break"></span><dl class="dlParallel" id="section-5.2-2">
<dt id="section-5.2-2.1">
Local Address:</dt>
<dd style="margin-left: 1.5em" id="section-5.2-2.2"> Zero-filled; the local address is not applicable.<a href="#section-5.2-2.2" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.2-2.3">
Local Port:</dt>
<dd style="margin-left: 1.5em" id="section-5.2-2.4"> Set to 0; the local port is not applicable.<a href="#section-5.2-2.4" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.2-2.5">
Remote Port:</dt>
<dd style="margin-left: 1.5em" id="section-5.2-2.6"> Set to 0; the remote port is not applicable.<a href="#section-5.2-2.6" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.2-2.7">
Sent OPEN Message:</dt>
<dd style="margin-left: 1.5em" id="section-5.2-2.8"> This is a fabricated BGP OPEN message.
Capabilities <span class="bcp14">MUST</span> include the 4-octet ASN and all necessary
capabilities to represent the Loc-RIB Route Monitoring messages.
Only include capabilities if they will be used for Loc-RIB
monitoring messages. For example, if ADD-PATH is enabled for
IPv6 and Loc-RIB contains additional paths, the ADD-PATH
capability should be included for IPv6. In the case of ADD-PATH,
the capability intent of advertise, receive, or both can be ignored
since the presence of the capability indicates enough that additional paths will be used for IPv6.<a href="#section-5.2-2.8" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
<dt id="section-5.2-2.9">
Received OPEN Message:</dt>
<dd style="margin-left: 1.5em" id="section-5.2-2.10"> Repeat of the same sent OPEN message. The
duplication allows the BMP receiver to parse the expected
received OPEN message as defined in <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.10" class="relref">Section 4.10</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span>.<a href="#section-5.2-2.10" class="pilcrow">¶</a>
</dd>
<dd class="break"></dd>
</dl>
<div id="PeerUpInfoTlv">
<section id="section-5.2.1">
<h4 id="name-peer-up-information">
<a href="#section-5.2.1" class="section-number selfRef">5.2.1. </a><a href="#name-peer-up-information" class="section-name selfRef">Peer Up Information</a>
</h4>
<p id="section-5.2.1-1">
The following Peer Up Information TLV type is added:<a href="#section-5.2.1-1" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-5.2.1-2.1">
<p id="section-5.2.1-2.1.1">Type = 3: VRF/Table Name. The Information field contains a
UTF-8 string whose value <span class="bcp14">MUST</span> be equal to the value of the VRF or
table name (e.g., RD instance name) being conveyed. The string size
<span class="bcp14">MUST</span> be within the range of 1 to 255 bytes.<a href="#section-5.2.1-2.1.1" class="pilcrow">¶</a></p>
<p id="section-5.2.1-2.1.2">
The VRF/Table Name TLV is optionally included to support implementations
that may not have defined a name. If a name is configured, it <span class="bcp14">MUST</span>
be included. The
default value of "global" <span class="bcp14">MUST</span> be used for the default Loc-RIB
instance with a zero-filled distinguisher.
If the TLV is included, then it <span class="bcp14">MUST</span> also be included in the Peer
Down notification.<a href="#section-5.2.1-2.1.2" class="pilcrow">¶</a></p>
</li>
</ul>
<p id="section-5.2.1-3">The Information field contains a
UTF-8 string whose value <span class="bcp14">MUST</span> be equal to the value of the VRF or
table name (e.g., RD instance name) being conveyed. The string size
<span class="bcp14">MUST</span> be within the range of 1 to 255 bytes.<a href="#section-5.2.1-3" class="pilcrow">¶</a></p>
<p id="section-5.2.1-4">
The VRF/Table Name TLV is optionally included to support implementations
that may not have defined a name. If a name is configured, it <span class="bcp14">MUST</span>
be included. The
default value of "global" <span class="bcp14">MUST</span> be used for the default Loc-RIB
instance with a zero-filled distinguisher.
If the TLV is included, then it <span class="bcp14">MUST</span> also be included in the Peer Down notification.<a href="#section-5.2.1-4" class="pilcrow">¶</a></p>
<p id="section-5.2.1-5">
Multiple TLVs of the same type can be repeated as part of the same message,
for example, to convey a filtered view of a VRF. A BMP receiver should append
multiple TLVs of the same type to a set in order to support alternate or
additional names for the same peer. If multiple strings are included, their
ordering <span class="bcp14">MUST</span> be preserved when they are reported.<a href="#section-5.2.1-5" class="pilcrow">¶</a></p>
</section>
</div>
</section>
</div>
<div id="PeerDownReasonCode">
<section id="section-5.3">
<h3 id="name-peer-down-notification">
<a href="#section-5.3" class="section-number selfRef">5.3. </a><a href="#name-peer-down-notification" class="section-name selfRef">Peer Down Notification</a>
</h3>
<p id="section-5.3-1">
The Peer Down notification <span class="bcp14">MUST</span> use reason code 6. Following the reason is data
in TLV format. The following Peer Down Information TLV type is defined:<a href="#section-5.3-1" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-5.3-2.1">
Type = 3: VRF/Table Name. The Information field contains a
UTF-8 string whose value <span class="bcp14">MUST</span> be equal to the value of the VRF or
table name (e.g., RD instance name) being conveyed. The string size
<span class="bcp14">MUST</span> be within the range of 1 to 255 bytes. The VRF/Table Name
informational TLV <span class="bcp14">MUST</span> be included if it was in the Peer Up.<a href="#section-5.3-2.1" class="pilcrow">¶</a>
</li>
</ul>
</section>
</div>
<section id="section-5.4">
<h3 id="name-route-monitoring">
<a href="#section-5.4" class="section-number selfRef">5.4. </a><a href="#name-route-monitoring" class="section-name selfRef">Route Monitoring</a>
</h3>
<p id="section-5.4-1">
Route Monitoring messages are used for initial synchronization of
the Loc-RIB. They are also used to convey incremental Loc-RIB
changes.<a href="#section-5.4-1" class="pilcrow">¶</a></p>
<p id="section-5.4-2">
As described in <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.6" class="relref">Section 4.6</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span>, "Following the
common BMP header and per-peer header is a BGP Update PDU."<a href="#section-5.4-2" class="pilcrow">¶</a></p>
<section id="section-5.4.1">
<h4 id="name-asn-encoding">
<a href="#section-5.4.1" class="section-number selfRef">5.4.1. </a><a href="#name-asn-encoding" class="section-name selfRef">ASN Encoding</a>
</h4>
<p id="section-5.4.1-1">
Loc-RIB Route Monitoring messages <span class="bcp14">MUST</span> use a 4-byte ASN encoding as indicated
in the <span><a href="#PeerUpNotify" class="xref">Peer Up sent OPEN message</a> (<a href="#PeerUpNotify" class="xref">Section 5.2</a>)</span> capability.<a href="#section-5.4.1-1" class="pilcrow">¶</a></p>
</section>
<section id="section-5.4.2">
<h4 id="name-granularity">
<a href="#section-5.4.2" class="section-number selfRef">5.4.2. </a><a href="#name-granularity" class="section-name selfRef">Granularity</a>
</h4>
<p id="section-5.4.2-1">
State compression and throttling <span class="bcp14">SHOULD</span> be used by a BMP sender
to reduce the amount of Route Monitoring messages that are
transmitted to BMP receivers. With state compression, only the
final resultant updates are sent.<a href="#section-5.4.2-1" class="pilcrow">¶</a></p>
<p id="section-5.4.2-2">
For example, prefix 192.0.2.0/24 is updated in the Loc-RIB 5 times
within 1 second. State compression of BMP Route Monitoring messages
results in only the final change being transmitted. The other 4
changes are suppressed because they fall within the compression
interval. If no compression was being used, all 5 updates would
have been transmitted.<a href="#section-5.4.2-2" class="pilcrow">¶</a></p>
<p id="section-5.4.2-3">
A BMP receiver should expect that the granularity of Loc-RIB Route Monitoring can
vary depending on the BMP sender implementation.<a href="#section-5.4.2-3" class="pilcrow">¶</a></p>
</section>
</section>
<section id="section-5.5">
<h3 id="name-route-mirroring">
<a href="#section-5.5" class="section-number selfRef">5.5. </a><a href="#name-route-mirroring" class="section-name selfRef">Route Mirroring</a>
</h3>
<p id="section-5.5-1">
<span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.7" class="relref">Section 4.7</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span>
defines Route Mirroring for verbatim duplication of messages received. This
is not applicable to Loc-RIB as PDUs are originated by the router.
Any received Route Mirroring messages <span class="bcp14">SHOULD</span> be ignored.<a href="#section-5.5-1" class="pilcrow">¶</a></p>
</section>
<section id="section-5.6">
<h3 id="name-statistics-report">
<a href="#section-5.6" class="section-number selfRef">5.6. </a><a href="#name-statistics-report" class="section-name selfRef">Statistics Report</a>
</h3>
<p id="section-5.6-1">
Not all Stat Types are relevant to Loc-RIB. The Stat Types that
are relevant are listed below:<a href="#section-5.6-1" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-5.6-2.1">
Stat Type = 8: (64-bit Gauge) Number of routes in Loc-RIB.<a href="#section-5.6-2.1" class="pilcrow">¶</a>
</li>
<li class="normal" id="section-5.6-2.2">
Stat Type = 10: Number of routes in per-AFI/SAFI Loc-RIB. The
value is structured as: 2-byte AFI, 1-byte SAFI, followed by a 64-bit Gauge.<a href="#section-5.6-2.2" class="pilcrow">¶</a>
</li>
</ul>
</section>
</section>
<section id="section-6">
<h2 id="name-other-considerations">
<a href="#section-6" class="section-number selfRef">6. </a><a href="#name-other-considerations" class="section-name selfRef">Other Considerations</a>
</h2>
<section id="section-6.1">
<h3 id="name-loc-rib-implementation">
<a href="#section-6.1" class="section-number selfRef">6.1. </a><a href="#name-loc-rib-implementation" class="section-name selfRef">Loc-RIB Implementation</a>
</h3>
<p id="section-6.1-1">
There are several methods for a BGP speaker to implement Loc-RIB efficiently.
In all methods, the implementation emulates a peer with Peer Up and Down
messages to convey capabilities as well as Route Monitor messages to
convey Loc-RIB. In this sense, the peer that conveys the Loc-RIB is
a locally emulated peer.<a href="#section-6.1-1" class="pilcrow">¶</a></p>
<section id="section-6.1.1">
<h4 id="name-multiple-loc-rib-peers">
<a href="#section-6.1.1" class="section-number selfRef">6.1.1. </a><a href="#name-multiple-loc-rib-peers" class="section-name selfRef">Multiple Loc-RIB Peers</a>
</h4>
<p id="section-6.1.1-1">
There <span class="bcp14">MUST</span> be at least one emulated peer for each Loc-RIB instance,
such as with VRFs. The BMP receiver identifies the Loc-RIB by the peer
header distinguisher and BGP ID. The BMP receiver uses the VRF/Table
Name from the Peer Up information to associate a name with the Loc-RIB.<a href="#section-6.1.1-1" class="pilcrow">¶</a></p>
<p id="section-6.1.1-2">
In some implementations, it might be required to have more than one
emulated peer for Loc-RIB to convey different address families for
the same Loc-RIB. In this case, the peer distinguisher and BGP ID
should be the same since they represent the same Loc-RIB instance.
Each emulated peer instance <span class="bcp14">MUST</span> send a Peer Up with the OPEN message
indicating the address family capabilities. A BMP receiver <span class="bcp14">MUST</span>
process these capabilities to know which peer belongs to which
address family.<a href="#section-6.1.1-2" class="pilcrow">¶</a></p>
</section>
<div id="FilterLocRib">
<section id="section-6.1.2">
<h4 id="name-filtering-loc-rib-to-bmp-re">
<a href="#section-6.1.2" class="section-number selfRef">6.1.2. </a><a href="#name-filtering-loc-rib-to-bmp-re" class="section-name selfRef">Filtering Loc-RIB to BMP Receivers</a>
</h4>
<p id="section-6.1.2-1">
There may be use cases where BMP receivers should only receive
specific routes from Loc-RIB. For example, IPv4 unicast routes may
include internal BGP (IBGP), external BGP (EBGP), and IGP, but only
routes from EBGP should be sent
to the BMP receiver. Alternatively, it may be that only IBGP and
EBGP should be sent and IGP redistributed routes excluded. In these cases where the Loc-RIB is filtered, the F flag
is set to 1 to indicate to the BMP receiver that the Loc-RIB is
filtered. If multiple filters are associated with the same Loc-RIB,
a table name <span class="bcp14">MUST</span> be used in order to allow a BMP receiver to make
the right associations.<a href="#section-6.1.2-1" class="pilcrow">¶</a></p>
</section>
</div>
<section id="section-6.1.3">
<h4 id="name-changes-to-existing-bmp-ses">
<a href="#section-6.1.3" class="section-number selfRef">6.1.3. </a><a href="#name-changes-to-existing-bmp-ses" class="section-name selfRef">Changes to Existing BMP Sessions</a>
</h4>
<p id="section-6.1.3-1">
In case of any change that results in the alteration of behavior of
an existing BMP session, i.e., changes to filtering and table names, the
session <span class="bcp14">MUST</span> be bounced with a Peer Down / Peer Up sequence.<a href="#section-6.1.3-1" class="pilcrow">¶</a></p>
</section>
</section>
</section>
<section id="section-7">
<h2 id="name-security-considerations">
<a href="#section-7" class="section-number selfRef">7. </a><a href="#name-security-considerations" class="section-name selfRef">Security Considerations</a>
</h2>
<p id="section-7-1">
The same considerations as in <span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-11" class="relref">Section 11</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> apply to this
document. Implementations of this protocol <span class="bcp14">SHOULD</span> require that sessions only be established with
authorized and trusted monitoring devices. It is also believed that this document does
not introduce any additional security considerations.<a href="#section-7-1" class="pilcrow">¶</a></p>
</section>
<section id="section-8">
<h2 id="name-iana-considerations">
<a href="#section-8" class="section-number selfRef">8. </a><a href="#name-iana-considerations" class="section-name selfRef">IANA Considerations</a>
</h2>
<p id="section-8-1">
IANA has assigned new parameters
to the <a href="https://www.iana.org/assignments/bmp-parameters/">
"BGP Monitoring Protocol (BMP) Parameters" registry</a>.<a href="#section-8-1" class="pilcrow">¶</a></p>
<section id="section-8.1">
<h3 id="name-bmp-peer-type">
<a href="#section-8.1" class="section-number selfRef">8.1. </a><a href="#name-bmp-peer-type" class="section-name selfRef">BMP Peer Type</a>
</h3>
<p id="section-8.1-1">IANA has registered the following new peer type (<a href="#PeerType" class="xref">Section 4.1</a>):<a href="#section-8.1-1" class="pilcrow">¶</a></p>
<span id="name-bmp-peer-type-2"></span><div id="t1">
<table class="center" id="table-1">
<caption>
<a href="#table-1" class="selfRef">Table 1</a>:
<a href="#name-bmp-peer-type-2" class="selfRef">BMP Peer Type</a>
</caption>
<thead>
<tr>
<th class="text-left" rowspan="1" colspan="1">Peer Type</th>
<th class="text-left" rowspan="1" colspan="1">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-left" rowspan="1" colspan="1">3</td>
<td class="text-left" rowspan="1" colspan="1">Loc-RIB Instance Peer</td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="section-8.2">
<h3 id="name-bmp-loc-rib-instance-peer-f">
<a href="#section-8.2" class="section-number selfRef">8.2. </a><a href="#name-bmp-loc-rib-instance-peer-f" class="section-name selfRef">BMP Loc-RIB Instance Peer Flags</a>
</h3>
<p id="section-8.2-1">
IANA has renamed "BMP Peer Flags" to
"BMP Peer Flags for Peer Types 0 through 2" and created a new registry
named "BMP Peer Flags for Loc-RIB Instance Peer Type 3".<a href="#section-8.2-1" class="pilcrow">¶</a></p>
<p id="section-8.2-2">This document defines peer flags that are specific to the
Loc-RIB Instance Peer Type. IANA has registered the following in
the "BMP Peer Flags for Loc-RIB Instance Peer Type 3" registry:<a href="#section-8.2-2" class="pilcrow">¶</a></p>
<span id="name-loc-rib-instance-peer-type"></span><div id="t2">
<table class="center" id="table-2">
<caption>
<a href="#table-2" class="selfRef">Table 2</a>:
<a href="#name-loc-rib-instance-peer-type" class="selfRef">Loc-RIB Instance Peer Type</a>
</caption>
<thead>
<tr>
<th class="text-left" rowspan="1" colspan="1">Flag</th>
<th class="text-left" rowspan="1" colspan="1">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-left" rowspan="1" colspan="1">0</td>
<td class="text-left" rowspan="1" colspan="1">F flag</td>
</tr>
</tbody>
</table>
</div>
<p id="section-8.2-4">As noted in <a href="#PeerFlags" class="xref">Section 4.2</a>, the F flag indicates that the Loc-RIB is filtered. This indicates that the Loc-RIB does not represent the complete routing table.<a href="#section-8.2-4" class="pilcrow">¶</a></p>
<p id="section-8.2-5">
Flags 1 through 7 are unassigned. The registration procedure for the
registry is Standards Action.<a href="#section-8.2-5" class="pilcrow">¶</a></p>
</section>
<section id="section-8.3">
<h3 id="name-peer-up-information-tlv">
<a href="#section-8.3" class="section-number selfRef">8.3. </a><a href="#name-peer-up-information-tlv" class="section-name selfRef">Peer Up Information TLV</a>
</h3>
<p id="section-8.3-1">
IANA has renamed the "BMP Initiation Message TLVs" registry to "BMP Initiation and Peer Up Information TLVs".
<span><a href="https://www.rfc-editor.org/rfc/rfc7854#section-4.4" class="relref">Section 4.4</a> of [<a href="#RFC7854" class="xref">RFC7854</a>]</span> indicates that
both Initiation and Peer Up share the same information TLVs.
This document defines the following new BMP Peer Up Information
TLV type (<a href="#PeerUpInfoTlv" class="xref">Section 5.2.1</a>):<a href="#section-8.3-1" class="pilcrow">¶</a></p>
<span id="name-bmp-peer-up-information-tlv"></span><div id="t3">
<table class="center" id="table-3">
<caption>
<a href="#table-3" class="selfRef">Table 3</a>:
<a href="#name-bmp-peer-up-information-tlv" class="selfRef">BMP Peer Up Information TLV Type</a>
</caption>
<thead>
<tr>
<th class="text-left" rowspan="1" colspan="1">Type</th>
<th class="text-left" rowspan="1" colspan="1">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-left" rowspan="1" colspan="1">3</td>
<td class="text-left" rowspan="1" colspan="1">VRF/Table Name</td>
</tr>
</tbody>
</table>
</div>
<p id="section-8.3-3">The Information field contains a UTF-8 string whose value
<span class="bcp14">MUST</span> be equal to the value of the VRF or table name
(e.g., RD instance name) being conveyed. The string size
<span class="bcp14">MUST</span> be within the range of 1 to 255 bytes.<a href="#section-8.3-3" class="pilcrow">¶</a></p>
</section>
<section id="section-8.4">
<h3 id="name-peer-down-reason-code">
<a href="#section-8.4" class="section-number selfRef">8.4. </a><a href="#name-peer-down-reason-code" class="section-name selfRef">Peer Down Reason Code</a>
</h3>
<p id="section-8.4-1">
IANA has registered the following new BMP Peer Down reason code
(<a href="#PeerDownReasonCode" class="xref">Section 5.3</a>):<a href="#section-8.4-1" class="pilcrow">¶</a></p>
<span id="name-bmp-peer-down-reason-code"></span><div id="t4">
<table class="center" id="table-4">
<caption>
<a href="#table-4" class="selfRef">Table 4</a>:
<a href="#name-bmp-peer-down-reason-code" class="selfRef">BMP Peer Down Reason Code</a>
</caption>
<thead>
<tr>
<th class="text-left" rowspan="1" colspan="1">Type</th>
<th class="text-left" rowspan="1" colspan="1">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="text-left" rowspan="1" colspan="1">6</td>
<td class="text-left" rowspan="1" colspan="1">Local system closed, TLV data follows</td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="section-8.5">
<h3 id="name-deprecated-entries">
<a href="#section-8.5" class="section-number selfRef">8.5. </a><a href="#name-deprecated-entries" class="section-name selfRef">Deprecated Entries</a>
</h3>
<p id="section-8.5-1">Per this document, IANA has marked the F Flag entry in the "BMP
Peer Flags for Peer Types 0 through 2" registry as
"deprecated".<a href="#section-8.5-1" class="pilcrow">¶</a></p>
</section>
</section>
<section id="section-9">
<h2 id="name-references">
<a href="#section-9" class="section-number selfRef">9. </a><a href="#name-references" class="section-name selfRef">References</a>
</h2>
<section id="section-9.1">
<h3 id="name-normative-references">
<a href="#section-9.1" class="section-number selfRef">9.1. </a><a href="#name-normative-references" class="section-name selfRef">Normative References</a>
</h3>
<dl class="references">
<dt id="RFC2119">[RFC2119]</dt>
<dd>
<span class="refAuthor">Bradner, S.</span>, <span class="refTitle">"Key words for use in RFCs to Indicate Requirement Levels"</span>, <span class="seriesInfo">BCP 14</span>, <span class="seriesInfo">RFC 2119</span>, <span class="seriesInfo">DOI 10.17487/RFC2119</span>, <time datetime="1997-03" class="refDate">March 1997</time>, <span><<a href="https://www.rfc-editor.org/info/rfc2119">https://www.rfc-editor.org/info/rfc2119</a>></span>. </dd>
<dd class="break"></dd>
<dt id="RFC4271">[RFC4271]</dt>
<dd>
<span class="refAuthor">Rekhter, Y., Ed.</span>, <span class="refAuthor">Li, T., Ed.</span>, and <span class="refAuthor">S. Hares, Ed.</span>, <span class="refTitle">"A Border Gateway Protocol 4 (BGP-4)"</span>, <span class="seriesInfo">RFC 4271</span>, <span class="seriesInfo">DOI 10.17487/RFC4271</span>, <time datetime="2006-01" class="refDate">January 2006</time>, <span><<a href="https://www.rfc-editor.org/info/rfc4271">https://www.rfc-editor.org/info/rfc4271</a>></span>. </dd>
<dd class="break"></dd>
<dt id="RFC7854">[RFC7854]</dt>
<dd>
<span class="refAuthor">Scudder, J., Ed.</span>, <span class="refAuthor">Fernando, R.</span>, and <span class="refAuthor">S. Stuart</span>, <span class="refTitle">"BGP Monitoring Protocol (BMP)"</span>, <span class="seriesInfo">RFC 7854</span>, <span class="seriesInfo">DOI 10.17487/RFC7854</span>, <time datetime="2016-06" class="refDate">June 2016</time>, <span><<a href="https://www.rfc-editor.org/info/rfc7854">https://www.rfc-editor.org/info/rfc7854</a>></span>. </dd>
<dd class="break"></dd>
<dt id="RFC8174">[RFC8174]</dt>
<dd>
<span class="refAuthor">Leiba, B.</span>, <span class="refTitle">"Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words"</span>, <span class="seriesInfo">BCP 14</span>, <span class="seriesInfo">RFC 8174</span>, <span class="seriesInfo">DOI 10.17487/RFC8174</span>, <time datetime="2017-05" class="refDate">May 2017</time>, <span><<a href="https://www.rfc-editor.org/info/rfc8174">https://www.rfc-editor.org/info/rfc8174</a>></span>. </dd>
<dd class="break"></dd>
</dl>
</section>
<section id="section-9.2">
<h3 id="name-informative-references">
<a href="#section-9.2" class="section-number selfRef">9.2. </a><a href="#name-informative-references" class="section-name selfRef">Informative References</a>
</h3>
<dl class="references">
<dt id="RFC7911">[RFC7911]</dt>
<dd>
<span class="refAuthor">Walton, D.</span>, <span class="refAuthor">Retana, A.</span>, <span class="refAuthor">Chen, E.</span>, and <span class="refAuthor">J. Scudder</span>, <span class="refTitle">"Advertisement of Multiple Paths in BGP"</span>, <span class="seriesInfo">RFC 7911</span>, <span class="seriesInfo">DOI 10.17487/RFC7911</span>, <time datetime="2016-07" class="refDate">July 2016</time>, <span><<a href="https://www.rfc-editor.org/info/rfc7911">https://www.rfc-editor.org/info/rfc7911</a>></span>. </dd>
<dd class="break"></dd>
</dl>
</section>
</section>
<div id="Acknowledgements">
<section id="appendix-A">
<h2 id="name-acknowledgements">
<a href="#name-acknowledgements" class="section-name selfRef">Acknowledgements</a>
</h2>
<p id="appendix-A-1">
The authors would like to thank <span class="contact-name">John Scudder</span>, <span class="contact-name">Jeff Haas</span>, and <span class="contact-name">Mukul Srivastava</span>
for their valuable input.<a href="#appendix-A-1" class="pilcrow">¶</a></p>
</section>
</div>
<div id="authors-addresses">
<section id="appendix-B">
<h2 id="name-authors-addresses">
<a href="#name-authors-addresses" class="section-name selfRef">Authors' Addresses</a>
</h2>
<address class="vcard">
<div dir="auto" class="left"><span class="fn nameRole">Tim Evens</span></div>
<div dir="auto" class="left"><span class="org">Cisco Systems</span></div>
<div dir="auto" class="left"><span class="street-address">2901 Third Avenue, Suite 600</span></div>
<div dir="auto" class="left">
<span class="locality">Seattle</span>, <span class="region">WA</span> <span class="postal-code">98121</span>
</div>
<div dir="auto" class="left"><span class="country-name">United States of America</span></div>
<div class="email">
<span>Email:</span>
<a href="mailto:tievens@cisco.com" class="email">tievens@cisco.com</a>
</div>
</address>
<address class="vcard">
<div dir="auto" class="left"><span class="fn nameRole">Serpil Bayraktar</span></div>
<div dir="auto" class="left"><span class="org">Menlo Security</span></div>
<div dir="auto" class="left"><span class="street-address">800 W El Camino Real, Suite 250</span></div>
<div dir="auto" class="left">
<span class="locality">Mountain View</span>, <span class="region">CA</span> <span class="postal-code">94040</span>
</div>
<div dir="auto" class="left"><span class="country-name">United States of America</span></div>
<div class="email">
<span>Email:</span>
<a href="mailto:serpil.bayraktar@menlosecurity.com" class="email">serpil.bayraktar@menlosecurity.com</a>
</div>
</address>
<address class="vcard">
<div dir="auto" class="left"><span class="fn nameRole">Manish Bhardwaj</span></div>
<div dir="auto" class="left"><span class="org">Cisco Systems</span></div>
<div dir="auto" class="left"><span class="street-address">3700 Cisco Way</span></div>
<div dir="auto" class="left">
<span class="locality">San Jose</span>, <span class="region">CA</span> <span class="postal-code">95134</span>
</div>
<div dir="auto" class="left"><span class="country-name">United States of America</span></div>
<div class="email">
<span>Email:</span>
<a href="mailto:manbhard@cisco.com" class="email">manbhard@cisco.com</a>
</div>
</address>
<address class="vcard">
<div dir="auto" class="left"><span class="fn nameRole">Paolo Lucente</span></div>
<div dir="auto" class="left"><span class="org">NTT Communications</span></div>
<div dir="auto" class="left"><span class="street-address">Siriusdreef 70-72</span></div>
<div dir="auto" class="left">
<span class="postal-code">2132</span> <span class="locality">Hoofddorp</span>
</div>
<div dir="auto" class="left"><span class="country-name">Netherlands</span></div>
<div class="email">
<span>Email:</span>
<a href="mailto:paolo@ntt.net" class="email">paolo@ntt.net</a>
</div>
</address>
</section>
</div>
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