[Idr] Regd covering BGP-LS extensions for IGP ELC drafts

"Ketan Talaulikar (ketant)" <ketant@cisco.com> Thu, 25 July 2019 22:43 UTC

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "idr@ietf.org" <idr@ietf.org>, "draft-ietf-idr-bgp-ls-segment-routing-rld@ietf.org" <draft-ietf-idr-bgp-ls-segment-routing-rld@ietf.org>
Thread-Topic: Regd covering BGP-LS extensions for IGP ELC drafts
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Date: Thu, 25 Jul 2019 22:43:10 +0000
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Subject: [Idr] Regd covering BGP-LS extensions for IGP ELC drafts
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Hi Acee/All,

During the LSR WG meeting on Monday, we talked about covering the BGP-LS aspects of the following two IGP drafts in those drafts instead of requiring a separate document:

https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/

Originally, these IGP drafts introduced a new node capability that required a new BGP-LS TLV and this was captured in the IDR WG document https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

However after the discussion in the LSR WG over the last few months, the approach has changed such that the IGP signalling is being done by introduction of new flags and MSD-type. This makes the corresponding BGP-LS updates quite trivial and as discussed in the LSR WG, I would recommend to add some text (proposed below) to the two IGP documents.

OSPF:

The OSPF extensions defined in this document can be advertised via BGP-LS [RFC7752] using existing BGP-LS TLVs. The flags field of the OSPFv2 Extended Prefix TLV and the OSPFv3 PrefixOptions where the ELC Flag introduced in this document is advertised using the Prefix Attribute Flags TLV (TLV 1170) of the BGP-LS IPv4/IPv6 Prefix NLRI Attribute [https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-16#section-2.3.2]. The new ERLD MSD-type introduced for OSPF by this document is advertised using the Node MSD TLV (TLV 266) of BGP-LS Node NLRI Attribute [https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-msd-05#section-3].

ISIS:

The IS-IS extensions defined in this document can be advertised via BGP-LS [RFC7752] using existing BGP-LS TLVs. The Prefix Attribute Flags sub-TLV where the ELC Flag is introduced in this document is advertised using the Prefix Attribute Flags TLV (TLV 1170) of the BGP-LS IPv4/IPv6 Prefix NLRI Attribute [https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-16#section-2.3.2]. The new ERLD MSD-type introduced for IS-IS by this document is advertised using the Node MSD TLV (TLV 266) of BGP-LS Node NLRI Attribute [https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-msd-05#section-3].



I am copying the IDR WG and authors of the BGP-LS ERLD draft as well for their inputs/feedback.

Thanks,
Ketan

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Acee Lindem (acee)
Sent: 25 July 2019 16:28
To: lsr@ietf.org
Subject: [Lsr] IETF 105 LSR Working Group Meeting Minutes

I think we had some very good discussions in our sessions this week. I’ve uploaded the minutes for the both LSR sessions on Monday. Thanks much to Yingzhen Qu for taking them.

https://datatracker.ietf.org/meeting/105/materials/minutes-105-lsr-00

Thanks,
Acee