[Pals] FW: Re-negotiation of support of the PW Status TLV?
Alexander Vainshtein <[email protected]> Tue, 13 May 2025 09:33:41 +0000
| Newsgroups | gmane.ietf.pwe3 |
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--===============0363545318283475995== Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_PH0PR03MB6300DCE17C512F5B66FBA71BF696APH0PR03MB6300namp_" --_000_PH0PR03MB6300DCE17C512F5B66FBA71BF696APH0PR03MB6300namp_ Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Forwarding to the correct concluded WG... Regards, Sasha From: Alexander Vainshtein Sent: Tuesday, May 13, 2025 12:04 PM To: 'mpls' <[email protected]> Cc: Andrew G. Malis <[email protected]>; Stewart Bryant <stewart.bryant@gma= il.com>; [email protected] Subject: Re-negotiation of support of the PW Status TLV? Importance: High Hi all, I am sending this email to the MPLS WG which presumably will act as the car= etaker for any open issues pertaining to the scope of the concluded PWE3 WG= . Section 6.3.3 of RFC 8077<https://datatracker.ietf.org/doc/html/rfc8077#sec= tion-6.3.3> says (the relevant text is highlighted): When a PW is first set up, the PEs MUST attempt to negotiate the usage of the PW Status TLV. This is accomplished as follows: A PE that supports the PW Status TLV MUST include it in the initial Label Mapping message following the PW FEC and the Interface Parameter Sub- TLVs. The PW Status TLV will then be used for the lifetime of the pseudowire. This statement is copied verbatim from Section 5.4.3 of RFC 4447<https://d= atatracker.ietf.org/doc/html/rfc4447#section-5.4.3>,aAnd these negotiation = procedures are similar to the procedures of negotiation of the CW usage for= PW types for which the CW usage is not mandatory in Section 6.2 of RFC 444= 7. The negotiation procedures for the CW usage have been modified in RFC 6723 = and eventually subsumed by Section 7.3 of RFC 8077, so that now CW usage ca= n be re-negotiated "on the fly" by implementations, that support these modi= fications. I wonder whether a similar extension of the PW Status TLV negotiation proce= dures would be of any interest to the WG. Your feedback would be highly appreciated, Regards, and lots of thanks in advance, Sasha Disclaimer This e-mail together with any attachments may contain information of Ribbon= Communications Inc. and its Affiliates that is confidential and/or proprie= tary for the sole use of the intended recipient. Any review, disclosure, re= liance or distribution by others or forwarding without express permission i= s strictly prohibited. If you are not the intended recipient, please notify= the sender immediately and then delete all copies, including any attachmen= ts. --_000_PH0PR03MB6300DCE17C512F5B66FBA71BF696APH0PR03MB6300namp_ Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <html><head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style><!-- /* Font Definitions */ @font-face =09{font-family:"Cambria Math"; =09panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face =09{font-family:Calibri; =09panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face =09{font-family:Aptos;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal =09{margin:0cm; =09font-size:12.0pt; =09font-family:"Aptos",sans-serif; =09mso-ligatures:standardcontextual;} a:link, span.MsoHyperlink =09{mso-style-priority:99; =09color:#467886; =09text-decoration:underline;} span.EmailStyle19 =09{mso-style-type:personal-reply; =09font-family:"Aptos",sans-serif; =09color:windowtext;} .MsoChpDefault =09{mso-style-type:export-only; =09font-size:10.0pt; =09mso-ligatures:none;} @page WordSection1 =09{size:612.0pt 792.0pt; =09margin:72.0pt 90.0pt 72.0pt 90.0pt;} div.WordSection1 =09{page:WordSection1;} --></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]--> <style type=3D"text/css">.style1 {font-family: "Times New Roman";}</style><= /head><body lang=3D"EN-US" link=3D"#467886" vlink=3D"#96607D" style=3D"word= -wrap:break-word"> <div class=3D"WordSection1"> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Forwarding to the c= orrect concluded WG…<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <div> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;mso-ligatures:none">= Regards,<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;mso-ligatures:none">= Sasha<o:p></o:p></span></p> </div> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <div> <div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm = 0cm 0cm"> <p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:"= ;Calibri",sans-serif;mso-ligatures:none">From:</span></b><span style= =3D"font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatur= es:none"> Alexander Vainshtein <br> <b>Sent:</b> Tuesday, May 13, 2025 12:04 PM<br> <b>To:</b> 'mpls' <[email protected]><br> <b>Cc:</b> Andrew G. Malis <[email protected]>; Stewart Bryant <st= [email protected]>; [email protected]<br> <b>Subject:</b> Re-negotiation of support of the PW Status TLV?<br> <b>Importance:</b> High<o:p></o:p></span></p> </div> </div> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Hi all,<o:p></o:p><= /span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">I am sending this e= mail to the MPLS WG which presumably will act as the caretaker for any open= issues pertaining to the scope of the concluded PWE3 WG.<o:p></o:p></span>= </p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><a href=3D"https://= datatracker.ietf.org/doc/html/rfc8077#section-6.3.3">Section 6.3.3 of RFC 8= 077</a> says (the relevant text is <span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>):= <o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New""> When a PW is first set up, the PEs MUST attem= pt to negotiate the<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New""> usage of the PW Status TLV. This is acc= omplished as follows: A PE<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New""> that supports the PW Status TLV MUST include = it in the initial Label<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New""> Mapping message following the PW FEC and the = Interface Parameter Sub-<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New""> TLVs. <span style=3D"background:yellow;mso-highlight:yellow">The PW Status TLV wi= ll then be used for the lifetime of the<o:p></o:p></span></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co= urier New";background:yellow;mso-highlight:yellow"> pseudo= wire</span><span style=3D"font-size:11.0pt">.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">This statement is c= opied <i>verbatim</i> from <a href=3D"https://datatracker.ietf.org/doc/html/rfc4447#section-5.4.3">Sec= tion 5.4.3 of RFC 4447</a>,aAnd these negotiation procedures are similar to= the procedures of negotiation of the CW usage for PW types for which the C= W usage is not mandatory in Section 6.2 of RFC 4447.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">The negotiation pro= cedures for the CW usage have been modified in RFC 6723 and eventually subs= umed by Section 7.3 of RFC 8077, so that now CW usage can be re-negotiated = “on the fly” by implementations, that support these modifications.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">I wonder whether a = similar extension of the PW Status TLV negotiation procedures would be of a= ny interest to the WG.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Your feedback would= be highly appreciated,<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> </o:p></= span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;mso-ligatures:none">= Regards, and lots of thanks in advance,<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;mso-ligatures:none">= Sasha<o:p></o:p></span></p> <p class=3D"MsoNormal"><o:p> </o:p></p> </div> <br><br><p style=3D"font-family: Verdana; font-size:10pt; color:#666666;"><= b>Disclaimer</b></p><p style=3D"font-family: Verdana; font-size:8pt; color:= #666666;">This e-mail together with any attachments may contain information= of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, disc= losure, reliance or distribution by others or forwarding without express pe= rmission is strictly prohibited. If you are not the intended recipient, ple= ase notify the sender immediately and then delete all copies, including any= attachments. </p></body></html> --_000_PH0PR03MB6300DCE17C512F5B66FBA71BF696APH0PR03MB6300namp_-- --===============0363545318283475995== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KUGFscyBtYWls aW5nIGxpc3QgLS0gcGFsc0BpZXRmLm9yZwpUbyB1bnN1YnNjcmliZSBzZW5kIGFuIGVtYWlsIHRv IHBhbHMtbGVhdmVAaWV0Zi5vcmcK --===============0363545318283475995==--