Re: [Idr] draft-ietf-idr-tunnel-encaps

<> Tue, 26 November 2019 16:30 UTC

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From: <>
To: John Scudder <>
CC: "" <>, idr wg <>, Alvaro Retana <>
Thread-Topic: draft-ietf-idr-tunnel-encaps
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Date: Tue, 26 Nov 2019 16:30:16 +0000
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Subject: Re: [Idr] draft-ietf-idr-tunnel-encaps
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I was trying to suggest a smaller change, more specifically the following change:

OLD : each TLV is either a "Label-
   Index" TLV, an "IPv6 SID (Segment Identifier)" TLV, or an "Originator
   SRGB (Source Routing Global Block)" TLV.

NEW: each TLV is either a "Label-
   Index" TLV, or an "Originator
   SRGB (Source Routing Global Block)" TLV.

I could not find other reference to SRv6 SID or dependency on SRv6 so that simple change looks a priori safe.

However I have not re-read the whole draft, so I’m just raising the issue for the authors to fix.


From: John Scudder []
Sent: Tuesday, November 26, 2019 5:14 PM
Cc:; idr wg; Alvaro Retana
Subject: Re: draft-ietf-idr-tunnel-encaps

So we would remove Section 3.7 plus the few references to it elsewhere in the document? That seems fine, thanks for catching this. We also get to eliminate a normative reference dependency. :-)

IDR WG, if anyone has an objection, please raise it — but it seems like an open-and-shut case.



On Nov 26, 2019, at 10:38 AM,<> wrote:

Hi authors,
Cc’ing John and Alvaro as the document has left IDR WG.

TL;DR: I think that you should remove “an "IPv6 SID (Segment Identifier)" TLV,”<*section-3.7__;Iw!8WoA6RjC81c!VsJ456XB1LS-76ORABaTDwi2kEMtkvSglVu1GBspWDKTjkG7UKKk9Dn1oAQ_sg$> says:

   [I-D.ietf-idr-bgp-prefix-sid] defines a BGP Path attribute known as
   the "Prefix-SID Attribute".  This attribute is defined to contain a
   sequence of one or more TLVs, where each TLV is either a "Label-
   Index" TLV, an "IPv6 SID (Segment Identifier)" TLV, or an "Originator
   SRGB (Source Routing Global Block)" TLV.

Actually latest version of [I-D.ietf-idr-bgp-prefix-sid] has removed the support for "IPv6 SID (Segment Identifier)" TLV

The value 2 previously corresponded to the IPv6 SID TLV which was

   specified in previous versions of this document.  It was removed and

   usage of the BGP Prefix-SID for Segment Routing over the IPv6

   dataplane [I-D.ietf-spring-segment-routing<*ref-I-D.ietf-spring-segment-routing__;Iw!8WoA6RjC81c!VsJ456XB1LS-76ORABaTDwi2kEMtkvSglVu1GBspWDKTjkG7UKKk9DkVu8hmCg$>] has been deferred to

   future specifications.<*section-7__;Iw!8WoA6RjC81c!VsJ456XB1LS-76ORABaTDwi2kEMtkvSglVu1GBspWDKTjkG7UKKk9DlPf85KuQ$>

Best regards,


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