[Idr] Your question regarding https://datatracker.ietf.org/doc/draft-wang-idr-next-next-hop-nodes/

Kevin Wang <kfwang@juniper.net> Thu, 13 June 2024 01:37 UTC

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From: Kevin Wang <kfwang@juniper.net>
To: "keyur@arrcus.com" <keyur@arrcus.com>, Jeff Haas <jhaas@juniper.net>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: Your question regarding https://datatracker.ietf.org/doc/draft-wang-idr-next-next-hop-nodes/
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Date: Thu, 13 Jun 2024 01:37:15 +0000
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Subject: [Idr] Your question regarding https://datatracker.ietf.org/doc/draft-wang-idr-next-next-hop-nodes/
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Hi Keyur,

Thanks for your question for my off-cycle presentation of https://datatracker.ietf.org/doc/draft-wang-idr-next-next-hop-nodes/. Sorry for getting back to you very late. Here is your original question during the presentation:


“have you looked at BGP SPF in LSVR working group? where BGP can build a underlay graph to get what you want with link bandwidth”


I have read through your draft: https://datatracker.ietf.org/doc/draft-ietf-lsvr-bgp-spf/. Yes, BGP SPF could indeed provide next-next-hop nodes information (just like IGP). The intent of our draft is to do a small extension to the legacy BGP so that existing BGP deployments in CLOS can make use of it for certain features, such as Global Load Balancing. It will be useful for the foreseeable future. In case BPF SPF or optimized IGP are adopted in the CLOS network routing in the longer term, they could get the next-next-hop information from BGP SPF or IGP themselves without using this next-next-hop-nodes (NNHN) TLV.



Thanks,
Kevin


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