答复: Methods to label the passiv e interfaces within ISIS
"Aijun Wang" <[email protected]> Mon, 13 Jan 2020 16:39:05 +0800
| Newsgroups | gmane.ietf.isis |
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| Message-ID | <00eb01d5c9ec$ea8112d0$bf833870$__32689.5697087579$1578904842$gmane$org@org.cn> |
This is a multi-part message in MIME format. --===============2614779348086524074== Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EC_01D5CA2F.F8A452D0" Content-Language: zh-cn This is a multi-part message in MIME format. ------=_NextPart_000_00EC_01D5CA2F.F8A452D0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi, Tony: =20 Is it reasonable to put the link attribute information into the = =E2=80=9CIP Reachability TLV=E2=80=9D? IMHO, such stub link is not the normal links within IGP domain. Label = the related prefix is coming from the passive/stub link seems also = acceptable? =20 Best Regards. =20 Aijun Wang China Telecom =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: [email protected] = [mailto:[email protected]] =E4=BB=A3=E8=A1=A8 [email protected] =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=8810=E6=97=A5 = 15:27 =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang =E6=8A=84=E9=80=81: Les Ginsberg; Robert Raszuk; [email protected] =E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces = within ISIS =20 =20 Hi Aijun, =20 =20 For the link attributes that defined in RFC5029, as that stated in = <https://tools.ietf.org/html/rfc5029#section-2> = https://tools.ietf.org/html/rfc5029#section-2, this sub-TLV is included = in the TLV 22(Extended IS Reachability).=20 As I read the IANA code point = <https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints= ..xhtml#isis-tlv-codepoints-22-23-25-141-222-223> = https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.= xhtml#isis-tlv-codepoints-22-23-25-141-222-223, it notes this sub-TLV = can be included in all of these TLVs (22,23,25,141,222,223).=20 =20 But, when the interface is configured as passive/stub, it seems that the = above TLVs will not be advertised, because there is no IS neighbor on = this passive link. =20 =20 =20 Fair point. Given that there is an IP address and prefix on that link, = it would be very reasonable to advertise the Extended IP Reachability = TLV (135). We would then need to make the link attributes sub-TLV = applicable to this TLV (and it=E2=80=99s MT brother). =20 TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be one = appropriate TLV to include this sub-TLV, but it requires the IS-IS TE = deployment, and is not suitable for describing the passive/stub link on = edge router. =20 In summary, it seems put this attribute into the =E2=80=9CPrefix = Attribute Flags=E2=80=9D sub-TLV which can be included in TLV = 135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. = Reach, and MT IPv6 IP. Reach TLVs) is more applicable? =20 =20 It would seem to me that what you=E2=80=99re describing is an attribute = of a link, not of a prefix, thus I would favor it remaining a link = attribute. =20 But that=E2=80=99s just me. :-) =20 Tony =20 ------=_NextPart_000_00EC_01D5CA2F.F8A452D0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" = xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta = http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta = name=3DGenerator content=3D"Microsoft Word 12 (filtered = medium)"><style><!-- /* Font Definitions */ @font-face {font-family:Helvetica; panose-1:2 11 6 4 2 2 2 2 2 4;} @font-face {font-family:=E5=AE=8B=E4=BD=93; panose-1:2 1 6 0 3 1 1 1 1 1;} @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face {font-family:"\@=E5=AE=8B=E4=BD=93"; panose-1:2 1 6 0 3 1 1 1 1 1;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; margin-bottom:.0001pt; font-size:12.0pt; font-family:=E5=AE=8B=E4=BD=93;} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.apple-converted-space {mso-style-name:apple-converted-space;} span.EmailStyle18 {mso-style-type:personal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;} ..MsoChpDefault {mso-style-type:export-only; font-size:10.0pt;} @page WordSection1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt;} div.WordSection1 {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]--></head><body lang=3DZH-CN link=3Dblue = vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Hi, Tony:<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Is it reasonable to put the link attribute information into the = =E2=80=9CIP Reachability TLV=E2=80=9D?<o:p></o:p></span></p><p = class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>IMHO, such stub link is not the normal links within IGP domain.=C2=A0 = Label the related prefix is coming from the passive/stub link seems also = acceptable?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal = style=3D'text-align:justify;text-justify:inter-ideograph'><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal = style=3D'text-align:justify;text-justify:inter-ideograph'><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal = style=3D'text-align:justify;text-justify:inter-ideograph'><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal = style=3D'text-align:justify;text-justify:inter-ideograph'><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>China Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><div><div = style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm = 0cm 0cm'><p class=3DMsoNormal><b><span = style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span = lang=3DEN-US>:</span></span></b><span lang=3DEN-US = style=3D'font-size:10.0pt'> [email protected] = [mailto:[email protected]] </span><b><span = style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span = lang=3DEN-US = style=3D'font-size:10.0pt'>[email protected]<br></span><b><span = style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span = lang=3DEN-US>:</span></span></b><span lang=3DEN-US = style=3D'font-size:10.0pt'> 2020</span><span = style=3D'font-size:10.0pt'>=E5=B9=B4<span = lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>10</span>=E6=97=A5<span = lang=3DEN-US> 15:27<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span = lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun = Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span = lang=3DEN-US> Les Ginsberg; Robert Raszuk; = [email protected]<br></span><b>=E4=B8=BB=E9=A2=98<span = lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Methods to label = the passive interfaces within = ISIS<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><p = class=3DMsoNormal><span lang=3DEN-US>Hi = Aijun,<o:p></o:p></span></p><div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><div><blockquote = style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p = class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>For the link attributes that defined in RFC5029, as that stated = in<span class=3Dapple-converted-space> </span></span><span = lang=3DEN-US><a = href=3D"https://tools.ietf.org/html/rfc5029#section-2"><span = style=3D'color:purple'>https://tools.ietf.org/html/rfc5029#section-2</spa= n></a>,<span class=3Dapple-converted-space> </span></span><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>this sub-TLV is included in the TLV 22(Extended IS = Reachability).<span = class=3Dapple-converted-space> </span></span><span = lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>As I read the IANA code point<span = class=3Dapple-converted-space> </span></span><span lang=3DEN-US><a = href=3D"https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-cod= epoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223"><span = style=3D'color:purple'>https://www.iana.org/assignments/isis-tlv-codepoin= ts/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223</sp= an></a><span style=3D'color:#1F497D'>,<span = class=3Dapple-converted-space> </span></span></span><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>it notes this sub-TLV can be included in all of these TLVs = (22,23,25,141,222,223).<span = class=3Dapple-converted-space> </span></span><span = lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'> </span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p = class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>But, when the interface is configured as passive/stub, it seems that = the above TLVs will not be advertised, because there is no IS neighbor = on this passive link. <span = class=3Dapple-converted-space> </span></span><span = lang=3DEN-US><o:p></o:p></span></p></div></div></blockquote><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span lang=3DEN-US>Fair point. Given that there is an = IP address and prefix on that link, it would be very reasonable to = advertise the Extended IP Reachability TLV (135). We would then need to = make the link attributes sub-TLV applicable to this TLV (and = it=E2=80=99s MT brother).<o:p></o:p></span></p></div><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><p = class=3DMsoNormal><span = lang=3DEN-US><br><br><o:p></o:p></span></p><div><p = class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be = one appropriate TLV to include this sub-TLV, but it requires the IS-IS = TE deployment, and is not suitable for describing the passive/stub link = on edge router.</span><span = lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span = lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'> </span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p = class=3DMsoNormal><span lang=3DEN-US = style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497= D'>In summary, it seems put this attribute into the =E2=80=9CPrefix = Attribute Flags=E2=80=9D sub-TLV which can be included in TLV = 135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. = Reach, and MT IPv6 IP. Reach TLVs) is more applicable?</span><span = lang=3DEN-US><o:p></o:p></span></p></div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div></div><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span lang=3DEN-US>It would seem to me that what = you=E2=80=99re describing is an attribute of a link, not of a prefix, = thus I would favor it remaining a link = attribute.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span lang=3DEN-US>But that=E2=80=99s just me. = :-)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div><div><p = class=3DMsoNormal><span = lang=3DEN-US>Tony<o:p></o:p></span></p></div><div><p = class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p></div></div></body></html> ------=_NextPart_000_00EC_01D5CA2F.F8A452D0-- --===============2614779348086524074== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr --===============2614779348086524074==--