[Lsr] IP layer metrics collected by Edge routers - draft-dunbar-lsr-5g-edge-compute-ospf-ext (was: LSR Presentation Slot request)

[Linda Dunbar <[e-mail]>]

Acee,

The draft-dunbar-lsr-5g-edge-compute-ospf-ext has two parts:

  *   Aggregated Cost Advertisement
  *   IP Layer App-Metrics Advertisements by OSPF

"Aggregated Cost" is only applicable to scenario where all the A-ER can have a consistent algorithm to compute the Aggregated cost.

When it is not possible for all the egress edge routers to have a consistent algorithm to compute the aggregated cost or some routers need all the detailed IP Layer metrics for the App Servers for other purposes, the raw IP layer metrics collected A-ER will be distributed. Only the nodes that are capable of utilizing the metrics will process the sub-TLV.

Since only a subset of routers within an IGP domain need to know those detailed metrics, the draft used your suggested  OSPFv2 Extended Prefix Opaque LSA for IPv4 and OSPFv3 Extended LSA with Intra-Area-Prefix TLV to carry the detailed sub-TLVs.  For routers that don't care about those metrics, they can ignore them very easily.

It worth noting that not all hosts (prefix) attached to an A-ER are ANYCAST servers that need network optimization. An A-ER only needs to advertise the App-Metrics for the ANYCAST addresses that match with the configured ACLs.

Any other concerns?

Thank you
Linda Dunbar

From: Acee Lindem (acee) <[e-mail]>
Sent: Monday, July 12, 2021 4:04 PM
To: Linda Dunbar <[e-mail]>; Yingzhen Qu <[e-mail]>; [e-mail]
Cc: [e-mail]
Subject: Re: [Lsr] LSR Presentation Slot Requests - IETF111

Speaking as WG member:

Hi Linda,
Even if you've added some IS-IS encodings, the draft still suffers from the fundamental problem of the previous draft. If you can't rely on the A-ERs to consistently calculate an aggregated metric, how can you rely on all the routers in the IGP routing domain to use complex set of metrics to reach the least-loaded app server? Do we really want to talk about this again?
Thanks,
Acee

From: Linda Dunbar <[e-mail]<mailto:[e-mail]>>
Date: Monday, July 12, 2021 at 4:27 PM
To: Yingzhen Qu <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Cc: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Subject: RE: [Lsr] LSR Presentation Slot Requests - IETF111
Resent-From: <[e-mail]<mailto:[e-mail]>>
Resent-To: Acee Lindem <[e-mail]<mailto:[e-mail]>>, Christian Hopps <[e-mail]<mailto:[e-mail]>>, Yingzhen Qu <[e-mail]<mailto:[e-mail]>>
Resent-Date: Monday, July 12, 2021 at 4:27 PM

Yingzhen and LSR Chairs,

We need a 10 minutes slot at IETF111 to present https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-dunbar-lsr-5g-edge-compute%2F&data=04%7C01%7Clinda.dunbar%40futurewei.com%7C66caea5e0b7243b0d4ce08d94578939b%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637617206455265464%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=VB%2BWjb2Zd%2Fe0iSE8K%2BMCpL%2FbiZYqhS5T2602e2z2cPc%3D&reserved=0>
Speaker: Linda Dunbar.

This draft adds the IS-IS extension to the draft-dunbar-lsr-5g-edge-compute-ospf-ext-04.

Thank you
Linda Dunbar


From: Lsr <[e-mail]<mailto:[e-mail]>> On Behalf Of Yingzhen Qu
Sent: Wednesday, June 30, 2021 4:00 PM
To: [e-mail]<mailto:[e-mail]>
Cc: [e-mail]<mailto:[e-mail]>
Subject: [Lsr] LSR Presentation Slot Requests - IETF111

Hi all,

The draft agenda for IETF111 has been posted: https://datatracker.ietf.org/meeting/111/agenda<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fmeeting%2F111%2Fagenda&data=04%7C01%7Clinda.dunbar%40futurewei.com%7C66caea5e0b7243b0d4ce08d94578939b%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637617206455275420%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=uhIFfvuGreFkey%2BMO6fmTK52Y%2FmAc7C7Qlrj8FhzvIw%3D&reserved=0>.

LSR will have one meeting session: Friday, July 30, 2021 16:00-18:00  Session III PDT

Please send slot requests to [e-mail]<mailto:[e-mail]>. Please include name of the presenter, pointer to the draft and time estimation including Q&A.

Thanks,
Yingzhen