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[Idr] What do you think about this description of Path Selection added to draft-dunbar-idr-5g-edge-compute-app-meta-data?

Linda Dunbar <linda.dunbar@futurewei.com> Thu, 11 February 2021 03:33 UTC

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From: Linda Dunbar <linda.dunbar@futurewei.com>
To: "idr@ietf.org" <idr@ietf.org>, Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem (acee)" <acee@cisco.com>, Stephane Litkowski <slitkows.ietf@gmail.com>
CC: "draft-dunbar-idr-5g-edge-compute-app-meta-data@ietf.org" <draft-dunbar-idr-5g-edge-compute-app-meta-data@ietf.org>
Thread-Topic: What do you think about this description of Path Selection added to draft-dunbar-idr-5g-edge-compute-app-meta-data?
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Date: Thu, 11 Feb 2021 03:32:55 +0000
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Subject: [Idr] What do you think about this description of Path Selection added to draft-dunbar-idr-5g-edge-compute-app-meta-data?
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Stephane, Acee and IDR WG:

During the IETF109 session on draft-dunbar-idr-5g-edge-compute-app-meta-data, both of you pointed out that there should be a section describing the forwarding plane behavior, such as how does the route selection decision is made or changed with the additional information carried in  the AppMetaData.  AiJun also pointed out needing this description in the IDR mailing list.

We plan to add  this subsection. Is it good enough?

3.5   BGP Path Selection upon receiving AppMetaData
UEs anchored to PSA1 (5G UPF) and PSA2 (5G UPF) all need to communicate with S1:aa08::4450, which is the ANYCAST address with the servers attached to R1, R2, R3 and R5.
Packets from the UEs anchored to PSA1 will ingress to R-PSA1 (Ingress router); Packets from the UEs anchored to PSA2 will ingress R-PSA2.
Assume that both R-PSA1 and R-PSA2 have BGP Multipath enabled. As a result, the routing table in either of them would look like: Dst Address: S1:aa08::4450   ---- resolved via NH: R1, R2, R3, R5
Based on BGP AppMetaData TLV, let’s say local BGP Compute Application Plugin for AppMetaData finds R1 is the best for the flow S1:aa08::4450. Then this Compute Application Plugin can insert higher weight for the path R1 so that BGP Best Path is locally influenced by the weight parameter based on the local decision.

Just to refresh what we discussed in IETF109:

[cid:image002.png@01D6FFF4.4A9FFB70]

Thank you very much.

Linda Dunbar

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