Update required to RFC 5515 (L2TP Access Line Information AVP Extensions))
John Gibbons <[email protected]> Thu, 11 Feb 2016 22:26:49 +0000
| Newsgroups | gmane.ietf.l2tpext |
|---|---|
| Message-ID | <BLUPR0501MB2084691891752F29AE648EDFC2A80@BLUPR0501MB2084.namprd05.prod.outlook.com> |
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Hello -
There is a discrepancy between RFC 5515 and RFC 6320 with respect to an inc=
onsistency in the values for DSL-Type TLV (RFC 6320 section 6.5.2) and ANCP=
Access Line Type AVP (RFC 5515 section 5.18). The original intent has alw=
ays been that these values are consistent, and they were up to the point 55=
15 became an RFC. RFC 6320, however, was still in draft form, and the enum=
erated values for the DSL-Type TLV subsequently changed in a later version =
of the draft but were never reflected back into RFC 5515. So far it's not =
been a problem as the values 1-6 match, but should new access-line types be=
introduced, then a translation will always have to be performed when conve=
ying the ANCP-sourced value to this L2TP AVP.
This is what we currently have:
RFC 6320 DSL-Type AVP
RFC 5515 ANCP Access-Line Type AVP
OTHER =3D 0
ADSL1 =3D 1
0x01 ADSL1
ADSL2 =3D 2
0x02 ADSL2
ADSL2+ =3D 3
0x03 ADSL2+
VDSL1 =3D 4
0x04 VDSL1
VDSL2 =3D 5
0x05 VDSL2
SDSL =3D 6
0x06 SDSL
"Future" =3D 7+
0x07 UNKNOWN
0x08+ "Future"
>From a historical timeline, RFC 5515 reached RFC status in May 2009, well b=
efore RFC 6320 and was at the time accurately tracking the draft versions (=
draft-ietf-ancp-protocol). At the point of becoming an RFC, RFC 5515 was t=
racking to draft-ietf-ancp-protocol-05, which describes dsl-type as follows=
:
Following sub-TLVs are currently defined :
+ Type (DSL-Type =3D 0x91) : Defines the type of transmission
system in use. This is a mandatory TLV.
Length : (4 bytes)
Value : (Transmission system : ADSL1 =3D 0x01, ADSL2 =3D
0x02, ADSL2+ =3D 0x03, VDSL1 =3D 0x04, VDSL2 =3D 0x05, SDSL=
=3D
0x06, UNKNOWN =3D 0x07).
It turns out that, for draft-ietf-ancp-protocol-13 (dated January 2011), "U=
NKNOWN =3D 0x07" was renamed to "OTHER =3D 0", and it was not realized unti=
l recently that we've had such a discrepancy between RFCs.
This discrepancy is somewhat compounded by the fact that vendors have had t=
o inter-operate with different versions of ANCP:
- draft-wadhwa-gsmp-l2control-configuration. The DSL Type field val=
ues are consistent with those defined in draft-ietf-ancp-protocol-00 throug=
h -12.
- draft-ietf-ancp-protocol-00 through 17. Unfortunately all version=
s of this draft report the ANCP version 0x31, which implies there is no dir=
ect way to tell the change in DSL Type values that occurs at version -13 an=
d after.
- RFC 6320 - version 0x32
That said, to allow interoperability with earlier versions of ANCP and RFC =
6320, anticipate future allocation of access line types, and avoid a transl=
ation by the LAC, I'd like to initiate an erratum or some form of an update=
to RFC 5515 (section 5.18. ANCP Line Type AVP) as follows:
- Add OTHER 0 for consistency with draft-ietf-ancp-protocol-13 and l=
ater versions and RFC 6320
- Maintain UNKNOWN 0x07 for backward compatibility with draft-ietf-=
ancp-protocol-13 and earlier versions and draft-wadhwa-gsmp-l2control-confi=
guration-02 and earlier versions.
* This implies that RFC 6320 will need to be updated such that the D=
SL-Type value 7 (UNKNOWN) will need to be reserved (restored from the earli=
er drafts) for backward compatibility, requiring assignment of all new "dsl=
-types" to start at 8, allowing for re-alignment between RFCs. I've propos=
ed this to one of the RFC 6320 authors to coordinate, and he's on-board wit=
h the approach (I believe he has other follow-on updates he wishes to make =
to 6320, so here is our chance to fix this gap).
With the changes to the two RFCs, we would have the following (changes in g=
reen reflect modifications):
RFC 6320 DSL-Type AVP
RFC 5515 ANCP Access-Line Type AVP
OTHER =3D 0
0x00 OTHER
ADSL1 =3D 1
0x01 ADSL1
ADSL2 =3D 2
0x02 ADSL2
ADSL2+ =3D 3
0x03 ADSL2+
VDSL1 =3D 4
0x04 VDSL1
VDSL2 =3D 5
0x05 VDSL2
SDSL =3D 6
0x06 SDSL
UNKNOWN =3D 7
0x07 UNKNOWN
0x08+ "Future"
0x08+ "Future"
With this background, could you offer guidance as to whether this can be co=
vered as an erratum or will an alternate approach be required?
Many thanks for your guidance.
Regards,
John Gibbons
Juniper Networks
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ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Hello -<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">There is a discrepancy between RFC 5515 a=
nd RFC 6320 with respect to an inconsistency in the values for DSL-Type TLV=
(RFC 6320 section 6.5.2) and ANCP Access Line
Type AVP (RFC 5515 section 5.18). The original intent has always bee=
n that these values are consistent, and they were up to the point 5515 beca=
me an RFC. RFC 6320, however, was still in draft form, and the enumer=
ated values for the DSL-Type TLV subsequently
changed in a later version of the draft but were never reflected back into=
RFC 5515. So far it’s not been a problem as the values 1-6 mat=
ch, but should new access-line types be introduced, then a translation will=
always have to be performed when conveying
the ANCP-sourced value to this L2TP AVP. </span><span style=3D"color=
:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">This is what we currently have:</span><sp=
an style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" style=3D"border-collapse:collapse">
<tbody>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">RFC 6320 DSL-Type AVP</span><o:p></o:p></=
p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border:solid window=
text 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">RFC 5515 ANCP Access-Line Type AVP</span>=
<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre><b><span style=3D"color:#C00000">OTHER =3D 0</span></b><o:p></o:p></pr=
e>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL1 =3D 1<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co=
urier New"">0x01 ADSL1</span><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL2 =3D 2<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x02 ADSL2<o:p></o:p></pre>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL2+ =3D 3<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x03 ADSL2+<o:p></o:p></pre>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>VDSL1 =3D 4<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x04 VDSL1<o:p></o:p></pre>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>VDSL2 =3D 5<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x05 VDSL2<o:p></o:p></pre>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>SDSL =3D 6<o:p></o:p></pre>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x06 SDSL<o:p></o:p></pre>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co=
urier New"">“Future” =3D 7+</span><o:p></o:p></p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre><b><span style=3D"color:#C00000">0x07 UNKNOWN</span></b><o:p></o:p></p=
re>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x08+ “Future”<o:p></o:p></pre>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<pre><span style=3D"font-family:"Arial",sans-serif;color:#1F497D"=
> </span><span style=3D"color:black"><o:p></o:p></span></pre>
<pre><span style=3D"font-family:"Arial",sans-serif;color:black">F=
rom a historical timeline, RFC 5515 reached RFC status in May 2009, well be=
fore RFC 6320 and was at the time accurately tracking the draft versions (d=
raft-ietf-ancp-protocol). At the point of becoming an RFC, RFC 5515 w=
as tracking to draft-ietf-ancp-protocol-05, which describes dsl-type as fol=
lows:</span><span style=3D"color:black"><o:p></o:p></span></pre>
<pre><span style=3D"font-family:"Arial",sans-serif;color:black">&=
nbsp;</span><span style=3D"color:black"><o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
Following sub-TLVs are currently defined :<o:p></o:p></span></=
pre>
<pre><span style=3D"color:black"> <o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
+ Type (DSL-Type =3D 0x91) : Defines the type of tra=
nsmission<o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
system in use. This is a mandatory TLV=
.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"> <o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
Length : (4 bytes)<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black"> <o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
Value : (Transmission syst=
em : ADSL1 =3D 0x01, ADSL2 =3D<o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
0x02, ADSL2+ =3D 0x03,=
VDSL1 =3D 0x04, VDSL2 =3D 0x05, SDSL =3D<o:p></o:p></span></pre>
<pre><span style=3D"color:black"> =
0x06, <span style=3D"backg=
round:yellow;mso-highlight:yellow">UNKNOWN =3D 0x07</span>).<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black"> <o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">It turns out that, for draft-ietf-ancp-pr=
otocol-13 (dated January 2011), “UNKNOWN =3D 0x07” was renamed =
to “OTHER =3D 0”, and it was not realized until recently that
we’ve had such a discrepancy between RFCs. </span><span style=
=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:#1F497D"> </span><span style=3D"color:black=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">This discrepancy is somewhat compounded b=
y the fact that vendors have had to inter-operate with different versions o=
f ANCP:</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l6 level=
1 lfo6"><![if !supportLists]><span style=3D"font-size:10.0pt;font-family:&q=
uot;Arial",sans-serif;color:black"><span style=3D"mso-list:Ignore">-<s=
pan style=3D"font:7.0pt "Times New Roman""> &nbs=
p;
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">draft-wadhwa-gsmp-l2control-confi=
guration. The DSL Type field values are consistent with those defined=
in draft-ietf-ancp-protocol-00 through -12.
</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l6 level=
1 lfo6"><![if !supportLists]><span style=3D"font-size:10.0pt;font-family:&q=
uot;Arial",sans-serif;color:black"><span style=3D"mso-list:Ignore">-<s=
pan style=3D"font:7.0pt "Times New Roman""> &nbs=
p;
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">draft-ietf-ancp-protocol-00 throu=
gh 17. Unfortunately all versions of this draft report the ANCP versi=
on 0x31, which implies there is no direct way to
tell the change in DSL Type values that occurs at version -13 and after.</=
span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l6 level=
1 lfo6"><![if !supportLists]><span style=3D"font-size:10.0pt;font-family:&q=
uot;Arial",sans-serif;color:black"><span style=3D"mso-list:Ignore">-<s=
pan style=3D"font:7.0pt "Times New Roman""> &nbs=
p;
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">RFC 6320 – version 0x32</sp=
an><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:#1F497D"> </span><span style=3D"color:black=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">That said, to allow interoperability with=
earlier versions of ANCP and RFC 6320, anticipate future allocation of acc=
ess line types, and avoid a translation by the
LAC, I’d like to initiate an erratum or some form of an update to RF=
C 5515 (section 5.18. ANCP Line Type AVP) as follows:</span><span sty=
le=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.75in;text-indent:-.25in=
;mso-list:l4 level1 lfo7">
<![if !supportLists]><span style=3D"font-family:"Arial",sans-seri=
f;color:black"><span style=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &=
quot;Times New Roman"">
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">Add OTHER 0 for consistency with =
draft-ietf-ancp-protocol-13 and later versions and RFC 6320
</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:.75in;text-indent:-.25in=
;mso-list:l4 level1 lfo7">
<![if !supportLists]><span style=3D"font-family:"Arial",sans-seri=
f;color:black"><span style=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &=
quot;Times New Roman"">
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">Maintain UNKNOWN 0x07 for b=
ackward compatibility with draft-ietf-ancp-protocol-13 and earlier versions=
and draft-wadhwa-gsmp-l2control-configuration-02
and earlier versions. </span><span style=3D"color:black"><o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style=3D"font-family:Symbol;color:black"><span s=
tyle=3D"mso-list:Ignore">·<span style=3D"font:7.0pt "Times New =
Roman"">
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">This implies that RFC 6320 will n=
eed to be updated such that the DSL-Type value 7 (UNKNOWN) will need to be =
reserved (restored from the earlier drafts)
for backward compatibility, requiring assignment of all new “dsl-typ=
es” to start at 8, allowing for re-alignment between RFCs. I=
217;ve proposed this to one of the RFC 6320 authors to coordinate, and he&#=
8217;s on-board with the approach (I believe he has other follow-on
updates he wishes to make to 6320, so here is our chance to fix this gap).=
</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">With the changes to the two RFCs, we woul=
d have the following (changes in green reflect modifications):</span><span =
style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding=
=3D"0" style=3D"border-collapse:collapse">
<tbody>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">RFC 6320 DSL-Type AVP</span><o:p></o:p></=
p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border:solid window=
text 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">RFC 5515 ANCP Access-Line Type AVP</span>=
<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>OTHER =3D 0<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"=
;Courier New";color:#00B050">0x00 OTHER</span></b><o:p></o:p></p>
</td>
</tr>
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<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL1 =3D 1<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co=
urier New"">0x01 ADSL1</span><o:p></o:p></p>
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text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL2 =3D 2<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x02 ADSL2<o:p></o:p></pre>
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text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>ADSL2+ =3D 3<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x03 ADSL2+<o:p></o:p></pre>
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text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>VDSL1 =3D 4<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x04 VDSL1<o:p></o:p></pre>
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text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>VDSL2 =3D 5<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x05 VDSL2<o:p></o:p></pre>
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text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<pre>SDSL =3D 6<o:p></o:p></pre>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x06 SDSL<o:p></o:p></pre>
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<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"=
;Courier New";color:#00B050">UNKNOWN =3D 7</span></b><o:p></o:p></p>
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<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre>0x07 UNKNOWN<o:p></o:p></pre>
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<td width=3D"232" valign=3D"top" style=3D"width:139.2pt;border:solid window=
text 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class=3D"MsoNormal"><i><span style=3D"font-size:10.0pt;font-family:"=
;Courier New"">0x08+ “Future”</span></i><o:p></o:p></p=
>
</td>
<td width=3D"323" valign=3D"top" style=3D"width:193.5pt;border-top:none;bor=
der-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windo=
wtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<pre><i>0x08+ “Future” </i><o:p></o:p></pre>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"> </span><span style=3D"color:black">=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">With this background, could you offer gui=
dance as to whether this can be covered as an erratum or will an alternate =
approach be required? <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Many thanks for your guidance.</span><spa=
n style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">John Gibbons<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Juniper Networks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
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