Re: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt
Hi Shraddha, Thank you for replies. I think the case of Flex-Algo is different from normal SPF. Flex-Algo is used to compute paths based on constraints. The topology constraints include whether a link is considered for flex-algo calculation. And it is already realized by Node Participation, Admin Group and SRLG, as specified in draft-ietf-lsr-flex-algo. Could you explain the reason for defining additional Max-Generic-Metric? Thanks, Mengxiao -Original Message- From: Shraddha Hegde Sent: Thursday, January 12, 2023 12:45 PM To: Mengxiao.Chen ; lsr@ietf.org Subject: RE: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt Hi Chenmengxiao, Thanks for review and comments. Pls see inline [SH] for replies Juniper Business Use Only -Original Message- From: Chenmengxiao Sent: Wednesday, January 11, 2023 8:26 AM To: Shraddha Hegde ; lsr@ietf.org Subject: RE: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt [External Email. Be cautious of content] Hi Shraddha, In the new version, Generic Metric sub-TLV added "A metric value of 0x is considered as maximum link metric and a link having this metric MUST NOT be considered in SPF computation." With that I have two questions/suggestions: #1 Generic Metric sub-TLV may be used for different kinds of metric-type, maximum value can have different meanings. Besides, Admin Group rules can be used to exclude a link in Flex-Algo. Why must define a global unreachable value? [SH] RFC 3784 defined MAX-LINK-METRIC so that links can be advertised but not used for normal SPF computation. Same case applies here where links are not considered for flex-algo calculations but can be used for other reasons inside a flex-algo plane. #2 According to draft-ietf-lsr-flex-algo, I think it's better to use "Flex-Algorithm calculations" instead of "SPF computation". [SH]. Agree. Will update . Thanks, Mengxiao -Original Message- From: Lsr On Behalf Of Shraddha Hegde Sent: Tuesday, January 10, 2023 12:43 PM To: lsr@ietf.org Subject: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt WG, New version of the draft has been posted. Changes listed below. 1. Suggested codepoints in IANA section removed 2. Section 2.1 and 2.2 updated. Metric 0 is allowed. Added below sentence " Maximum link metric MUST NOT be used in SPF" 3. editorial changes. Pls review the draft. Rgds Shraddha Juniper Business Use Only -Original Message- From: Lsr On Behalf Of internet-dra...@ietf.org Sent: Tuesday, January 10, 2023 10:10 AM To: i-d-annou...@ietf.org Cc: lsr@ietf.org Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt [External Email. Be cautious of content] A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Flexible Algorithms: Bandwidth, Delay, Metrics and Constraints Authors : Shraddha Hegde William Britto A J Rajesh Shetty Bruno Decraene Peter Psenak Tony Li Filename: draft-ietf-lsr-flex-algo-bw-con-04.txt Pages : 29 Date: 2023-01-09 Abstract: Many networks configure the link metric relative to the link capacity. High bandwidth traffic gets routed as per the link capacity. Flexible algorithms provides mechanisms to create constraint based paths in IGP. This draft documents a generic metric type and set of bandwidth related constraints to be used in Flexible Algorithms. The IETF datatracker status page for this draft is: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo-bw-con/__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UPWiFZZw$ There is also an htmlized version available at: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8Use7KjRU$ A diff from the previous version is available at: https://urldefense.com/v3/__https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UFI_AgUI$ Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts ___ Lsr mailing list Lsr@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UhNjFf88$ ___ Lsr mailing list Lsr@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!B3EvgEhULdgY7X_tTtFDz1kUMPiFcuvaU0zktR
Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt
Shraddha - Regarding the new Generic Metric sub-TLV, there is a significant omission in the draft: Given that (as you discuss in Sections 2.1 and 2.2) some metric types cannot be advertised in the new Generic Metric sub-TLV because they are specified to be advertised in a different encoding, it seems necessary to enhance the existing IGP Metric Types registry (https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-metric-type) to specify for each defined metric type whether it can/cannot be advertised in the Generic Metric sub-TLV. But you do not discuss extending the registry in this way at all in the draft. As I have stated in the past, I am not a big fan of the Generic Metric sub-TLV. I think it would be possible to do what you want to do without a generic container - but I am also amenable to what is in the draft. However, you MUST ensure that the IGP Metric Types registry is explicit as regards how each defined metric type (now and in the future) is advertised (inside the Generic Metric sub-TLV or not) I also think that the clarity of the presentation in Sections 2.1/2.2 could be enhanced by separating the text into multiple paragraphs. For example: The Generic Metric sub-TLV MAY be advertised multiple times. For a particular metric type, the Generic Metric sub-TLV MUST be advertised only once for a link when advertised in TLV 22,222,23,223 and 141. When Generic metric sub-TLV is advertised in ASLA, each metric type MUST be advertised only once per-application for a link. If there are multiple Generic Metric sub-TLVs advertised for a link for same metric type (and same application in case of ASLA) in one or more received LSPDUs, advertisement in the lowest numbered fragment MUST be used and the subsequent ones MUST be ignored. If the metric type indicates a standard metric type for which there are other advertisement mechanisms (e.g., the IGP metric, the Min Unidirectional Link Delay, or the Traffic Engineering Default Metric, as of this writing), the Generic Metric advertisement MUST be ignored. A metric value of 0xFF is considered as maximum link metric and a link having this metric value MUST NOT be considered in SPF computation. Thanx. Les > -Original Message- > From: Lsr On Behalf Of Shraddha Hegde > Sent: Wednesday, January 11, 2023 9:01 PM > To: Acee Lindem ; lsr-...@ietf.org > Cc: lsr-cha...@ietf.org; draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org; lsr > > Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt > > Acee, > > This draft defines a new metric-type called "bandwidth metric" and available > for use in flex-algo. > The specifics are described in section 4 of the draft. > Instead of defining a stand alone "bandwidth metric type", the draft defines > "generic metric" > Where there is a provision for metric-type/metric value pair. Defines > standard metric types and to make it > Flexible there is user defined metric-types > "Bandwidth metric" is one of the standard metric-types of the generic metric > that this draft > has defined and used. > > Rgds > Shraddha > > > Juniper Business Use Only > > -Original Message- > From: Acee Lindem > Sent: Wednesday, January 11, 2023 11:44 PM > To: Shraddha Hegde ; lsr-...@ietf.org > Cc: lsr-cha...@ietf.org; draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org; lsr > > Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt > > [External Email. Be cautious of content] > > > +LSR List…. > > > Hi Shraddha, > > I’ll request the ADs approve early allocation. However, I recall unanswered > questions as to whether the generic metric was required and how it would > be used. It isn’t required for the bandwidth constraints defined in the > draft. > Can you comment on this point? > > Thanks, > Acee > > > On Jan 9, 2023, at 11:43 PM, Shraddha Hegde > wrote: > > > > Chairs, > > > > Authors would like to request IANA early code-point allocation for the > draft. > > > > Rgds > > Shraddha > > > > > > Juniper Business Use Only > > > > -Original Message- > > From: Lsr On Behalf Of internet-dra...@ietf.org > > Sent: Tuesday, January 10, 2023 10:10 AM > > To: i-d-annou...@ietf.org > > Cc: lsr@ietf.org > > Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt > > > > [External Email. Be cautious of content] > > > > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > > This draft is a work item of the Link State Routing WG of the IETF. > > > >Title : Flexible Algorithms: Bandwidth, Delay, Metrics and > Constraints > >Authors : Shraddha Hegde > > William Britto A J > > Rajesh Shetty > > Bruno Decraene > > Peter Psenak > > Tony Li > > Filename: draft-ietf-lsr-flex-algo-bw-con-04.txt > > Pages : 29 > > Date
Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt
Acee, This draft defines a new metric-type called "bandwidth metric" and available for use in flex-algo. The specifics are described in section 4 of the draft. Instead of defining a stand alone "bandwidth metric type", the draft defines "generic metric" Where there is a provision for metric-type/metric value pair. Defines standard metric types and to make it Flexible there is user defined metric-types "Bandwidth metric" is one of the standard metric-types of the generic metric that this draft has defined and used. Rgds Shraddha Juniper Business Use Only -Original Message- From: Acee Lindem Sent: Wednesday, January 11, 2023 11:44 PM To: Shraddha Hegde ; lsr-...@ietf.org Cc: lsr-cha...@ietf.org; draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org; lsr Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt [External Email. Be cautious of content] +LSR List…. Hi Shraddha, I’ll request the ADs approve early allocation. However, I recall unanswered questions as to whether the generic metric was required and how it would be used. It isn’t required for the bandwidth constraints defined in the draft. Can you comment on this point? Thanks, Acee > On Jan 9, 2023, at 11:43 PM, Shraddha Hegde wrote: > > Chairs, > > Authors would like to request IANA early code-point allocation for the draft. > > Rgds > Shraddha > > > Juniper Business Use Only > > -Original Message- > From: Lsr On Behalf Of internet-dra...@ietf.org > Sent: Tuesday, January 10, 2023 10:10 AM > To: i-d-annou...@ietf.org > Cc: lsr@ietf.org > Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt > > [External Email. Be cautious of content] > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Link State Routing WG of the IETF. > >Title : Flexible Algorithms: Bandwidth, Delay, Metrics and > Constraints >Authors : Shraddha Hegde > William Britto A J > Rajesh Shetty > Bruno Decraene > Peter Psenak > Tony Li > Filename: draft-ietf-lsr-flex-algo-bw-con-04.txt > Pages : 29 > Date: 2023-01-09 > > Abstract: > Many networks configure the link metric relative to the link > capacity. High bandwidth traffic gets routed as per the link > capacity. Flexible algorithms provides mechanisms to create > constraint based paths in IGP. This draft documents a generic metric > type and set of bandwidth related constraints to be used in Flexible > Algorithms. > > > > The IETF datatracker status page for this draft is: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo-bw-con/__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UPWiFZZw$ > > There is also an htmlized version available at: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8Use7KjRU$ > > A diff from the previous version is available at: > https://urldefense.com/v3/__https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UFI_AgUI$ > > > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts > > > ___ > Lsr mailing list > Lsr@ietf.org > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UhNjFf88$ ___ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr
Re: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt
Hi Chenmengxiao, Thanks for review and comments. Pls see inline [SH] for replies Juniper Business Use Only -Original Message- From: Chenmengxiao Sent: Wednesday, January 11, 2023 8:26 AM To: Shraddha Hegde ; lsr@ietf.org Subject: RE: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt [External Email. Be cautious of content] Hi Shraddha, In the new version, Generic Metric sub-TLV added "A metric value of 0x is considered as maximum link metric and a link having this metric MUST NOT be considered in SPF computation." With that I have two questions/suggestions: #1 Generic Metric sub-TLV may be used for different kinds of metric-type, maximum value can have different meanings. Besides, Admin Group rules can be used to exclude a link in Flex-Algo. Why must define a global unreachable value? [SH] RFC 3784 defined MAX-LINK-METRIC so that links can be advertised but not used for normal SPF computation. Same case applies here where links are not considered for flex-algo calculations but can be used for other reasons inside a flex-algo plane. #2 According to draft-ietf-lsr-flex-algo, I think it's better to use "Flex-Algorithm calculations" instead of "SPF computation". [SH]. Agree. Will update . Thanks, Mengxiao -Original Message- From: Lsr On Behalf Of Shraddha Hegde Sent: Tuesday, January 10, 2023 12:43 PM To: lsr@ietf.org Subject: [Lsr] FW: I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt WG, New version of the draft has been posted. Changes listed below. 1. Suggested codepoints in IANA section removed 2. Section 2.1 and 2.2 updated. Metric 0 is allowed. Added below sentence " Maximum link metric MUST NOT be used in SPF" 3. editorial changes. Pls review the draft. Rgds Shraddha Juniper Business Use Only -Original Message- From: Lsr On Behalf Of internet-dra...@ietf.org Sent: Tuesday, January 10, 2023 10:10 AM To: i-d-annou...@ietf.org Cc: lsr@ietf.org Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt [External Email. Be cautious of content] A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Flexible Algorithms: Bandwidth, Delay, Metrics and Constraints Authors : Shraddha Hegde William Britto A J Rajesh Shetty Bruno Decraene Peter Psenak Tony Li Filename: draft-ietf-lsr-flex-algo-bw-con-04.txt Pages : 29 Date: 2023-01-09 Abstract: Many networks configure the link metric relative to the link capacity. High bandwidth traffic gets routed as per the link capacity. Flexible algorithms provides mechanisms to create constraint based paths in IGP. This draft documents a generic metric type and set of bandwidth related constraints to be used in Flexible Algorithms. The IETF datatracker status page for this draft is: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo-bw-con/__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UPWiFZZw$ There is also an htmlized version available at: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8Use7KjRU$ A diff from the previous version is available at: https://urldefense.com/v3/__https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UFI_AgUI$ Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts ___ Lsr mailing list Lsr@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UhNjFf88$ ___ Lsr mailing list Lsr@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!B3EvgEhULdgY7X_tTtFDz1kUMPiFcuvaU0zktRs-P5iMsY7ZrD6-0mgwGqWTppQ3ECBriApWSFv5qaYgKumZNy0$ - 本邮件及其附件含有新华三集团的保密信息，仅限于发送给上面地址中列出 的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、 或散发）本邮件中的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本 邮件！ This e-mail and its attachments contain confidential information from New H3C, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended re
Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt
+LSR List…. Hi Shraddha, I’ll request the ADs approve early allocation. However, I recall unanswered questions as to whether the generic metric was required and how it would be used. It isn’t required for the bandwidth constraints defined in the draft. Can you comment on this point? Thanks, Acee > On Jan 9, 2023, at 11:43 PM, Shraddha Hegde wrote: > > Chairs, > > Authors would like to request IANA early code-point allocation for the draft. > > Rgds > Shraddha > > > Juniper Business Use Only > > -Original Message- > From: Lsr On Behalf Of internet-dra...@ietf.org > Sent: Tuesday, January 10, 2023 10:10 AM > To: i-d-annou...@ietf.org > Cc: lsr@ietf.org > Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-04.txt > > [External Email. Be cautious of content] > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Link State Routing WG of the IETF. > >Title : Flexible Algorithms: Bandwidth, Delay, Metrics and > Constraints >Authors : Shraddha Hegde > William Britto A J > Rajesh Shetty > Bruno Decraene > Peter Psenak > Tony Li > Filename: draft-ietf-lsr-flex-algo-bw-con-04.txt > Pages : 29 > Date: 2023-01-09 > > Abstract: > Many networks configure the link metric relative to the link > capacity. High bandwidth traffic gets routed as per the link > capacity. Flexible algorithms provides mechanisms to create > constraint based paths in IGP. This draft documents a generic metric > type and set of bandwidth related constraints to be used in Flexible > Algorithms. > > > > The IETF datatracker status page for this draft is: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo-bw-con/__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UPWiFZZw$ > > There is also an htmlized version available at: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8Use7KjRU$ > > A diff from the previous version is available at: > https://urldefense.com/v3/__https://author-tools.ietf.org/iddiff?url2=draft-ietf-lsr-flex-algo-bw-con-04__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UFI_AgUI$ > > > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts > > > ___ > Lsr mailing list > Lsr@ietf.org > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!Db--a1RCey-Q7ZXMSpU93MYIPyuVk4YeN_KLhIVN0FsLiqDW8ARDpp485WSQ6jtGcNg-iL_V_VJkQ-71AZ8UhNjFf88$ ___ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr
