<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hello All, <div class=""><br class=""></div><div class="">IETF language is for RFCs and other activities of IETF, </div><div class="">we do use language for policy and contracts texts, so we tend to use more legal like meanings.</div><div class=""><br class=""></div><div class=""><div class="">
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<div><br class=""><blockquote type="cite" class=""><div class="">On 26 May 2020, at 19:33, Aikman-Scalese, Anne <<a href="mailto:AAikman@lrrc.com" class="">AAikman@lrrc.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><a name="_GoBack" class=""></a>Jeff, Cheryl, et al – below I paste the IETF definitions that were linked – note, for example, that “should” says “can be ignored” under certain circumstances – not sure anyone in the WG ever had that understanding of “should”.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class="">Anne<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Network Working Group S. Bradner<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Request for Comments: 2119 Harvard University<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">BCP: 14 March 1997<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Category: Best Current Practice<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> <b class=""><o:p class=""></o:p></b></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Key words for use in RFCs to Indicate Requirement Levels</span></b><b class=""><span style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Status of this Memo<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This document specifies an Internet Best Current Practices for the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> Internet Community, and requests discussion and suggestions for<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> improvements. Distribution of this memo is unlimited.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Abstract<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> In many standards track documents several words are used to signify<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> the requirements in the specification. These words are often<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> capitalized. This document defines these words as they should be<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> interpreted in IETF documents. Authors who follow these guidelines<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> should incorporate this phrase near the beginning of their document:<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> "OPTIONAL" in this document are to be interpreted as described in<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> <span class="Apple-converted-space"> </span><a href="https://tools.ietf.org/html/rfc2119" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span style="color: blue;" class="">RFC 2119</span></a>.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> Note that the force of these words is modified by the requirement<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> level of the document in which they are used.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><a name="section-1" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-1" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">1</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. MUST <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This word, or the terms "REQUIRED" or "SHALL", mean that the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> definition is an absolute requirement of the specification.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><a name="section-2" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-2" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">2</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. MUST NOT <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This phrase, or the phrase "SHALL NOT", mean that the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> definition is an absolute prohibition of the specification.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><a name="section-3" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-3" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">3</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. SHOULD <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This word, or the adjective "RECOMMENDED", mean that there<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> may exist valid reasons in particular circumstances to ignore a<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> particular item, but the full implications must be understood and<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> carefully weighed before choosing a different course.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><a name="section-4" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-4" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">4</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. SHOULD NOT <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This phrase, or the phrase "NOT RECOMMENDED" mean that<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> there may exist valid reasons in particular circumstances when the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> particular behavior is acceptable or even useful, but the full<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> implications should be understood and the case carefully weighed<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> before implementing any behavior described with this label.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">Bradner Best Current Practice [Page 1]<o:p class=""></o:p></span></div><div class="MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);"><span lang="EN" style="font-family: "Times New Roman", serif; color: windowtext;" class=""><hr size="2" width="768" align="left" style="width: 8in;" class=""></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><a name="page-2" class=""></a><a href="https://tools.ietf.org/html/rfc2119#page-2" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><span lang="EN" style="font-family: "Courier New"; color: white;" class=""></span></span><span class=""></span></a><span class=""></span><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><a href="https://tools.ietf.org/html/rfc2119" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span style="color: blue;" class="">RFC 2119</span></a> RFC Key Words March 1997<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><a name="section-5" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-5" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">5</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. MAY <span class="Apple-converted-space"> </span><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> This word, or the adjective "OPTIONAL", mean that an item is<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> truly optional. One vendor may choose to include the item because a<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> particular marketplace requires it or because the vendor feels that<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> it enhances the product while another vendor may omit the same item.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> An implementation which does not include a particular option MUST be<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> prepared to interoperate with another implementation which does<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> include the option, though perhaps with reduced functionality. In the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> same vein an implementation which does include a particular option<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> MUST be prepared to interoperate with another implementation which<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> does not include the option (except, of course, for the feature the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> option provides.)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><a name="section-6" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-6" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">6</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. Guidance in the use of these Imperatives<o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> Imperatives of the type defined in this memo must be used with care<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> and sparingly. In particular, they MUST only be used where it is<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> actually required for interoperation or to limit behavior which has<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> potential for causing harm (e.g., limiting retransmisssions) For<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> example, they must not be used to try to impose a particular method<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> on implementors where the method is not required for<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> interoperability.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><a name="section-7" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-7" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">7</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. Security Considerations<o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> These terms are frequently used to specify behavior with security<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> implications. The effects on security of not implementing a MUST or<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> SHOULD, or doing something the specification says MUST NOT or SHOULD<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> NOT be done may be very subtle. Document authors should take the time<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> to elaborate the security implications of not following<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> recommendations or requirements as most implementors will not have<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> had the benefit of the experience and discussion that produced the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> specification.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><a name="section-8" class=""></a><a href="https://tools.ietf.org/html/rfc2119#section-8" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span class=""><b class=""><span lang="EN" style="font-family: "Courier New";" class="">8</span></b></span><span class=""></span></a><span class=""></span><b class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class="">. Acknowledgments<o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> The definitions of these terms are an amalgam of definitions taken<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> from a number of RFCs. In addition, suggestions have been<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> incorporated from a number of people including Robert Ullmann, Thomas<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""> Narten, Neal McBurnett, and Robert Elz.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); break-before: page;" class=""><span lang="EN" style="font-family: "Courier New"; color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80);" class=""><o:p class=""> </o:p></div><table class="TableGridLight1" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse; border: none;"><tbody class=""><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><b class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(175, 39, 47);" class="">Anne E. Aikman-Scalese</span></b><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">Of Counsel</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; 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color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif;" class=""><a href="mailto:AAikman@lrrc.com" target="_new" title="Email User" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span style="color: rgb(175, 39, 47);" class="">AAikman@lrrc.com</span></a></span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">_____________________________</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif;" class=""><img border="0" id="Picture_x0020_1" style="" class="" apple-inline="yes" src="cid:image002.png@01D63340.C252AD10"></span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">Lewis Roca Rothgerber Christie LLP</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">One South Church Avenue, Suite 2000</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">Tucson, Arizona 85701-1611</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif;" class=""><a href="http://lrrc.com/" target="_new" title="Lewis Roca Rothgerber Christie Webpage" style="color: rgb(0, 135, 15); text-decoration: underline;" class=""><span style="color: rgb(175, 39, 47);" class="">lrrc.com</span></a></span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><p class="MsoNormal" style="margin: 2pt 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;"><span style="font-size: 9pt; line-height: 12.600000381469727px; font-family: Arial, sans-serif;" class=""><img border="0" id="Picture_x0020_2" style="" class="" apple-inline="yes" src="cid:image003.jpg@01D63340.C252AD10"></span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></p></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><p class="MsoNormal" style="margin: 2pt 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;"><span style="font-size: 10pt; line-height: 14px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">Because what matters</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></p></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; color: rgb(23, 96, 80); line-height: 16.799999237060547px;" class=""><span style="font-size: 10pt; line-height: 14px; font-family: Arial, sans-serif; color: rgb(50, 50, 50);" class="">to you, matters to us.™</span><span style="font-size: 11pt; line-height: 15.399999618530273px; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td width="336" valign="top" style="width: 3.5in; padding: 0in 5.4pt;" class=""></td></tr></tbody></table><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Verdana, sans-serif; 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