Re: [Idr] SRGB TLV
Eric C Rosen <erosen@juniper.net> Mon, 25 June 2018 18:39 UTC
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To: Robert Raszuk <robert@raszuk.net>, "Acee Lindem (acee)" <acee@cisco.com>
Cc: "idr@ietf. org" <idr@ietf.org>, Susan Hares <shares@ndzh.com>
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From: Eric C Rosen <erosen@juniper.net>
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Date: Mon, 25 Jun 2018 14:39:06 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/TDEGADkrIo1qlm39nr5G5if-qZ0>
Subject: Re: [Idr] SRGB TLV
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On 6/22/2018 2:02 PM, Robert Raszuk wrote: > So this TLV is to reside in the new attribute which can be placed into > BGP_UPDATE message of SAFI 4. This means that just for signalling > three statically configured values each router now has to enable new > SAFI (SAFI 4 is not that commonly used in any MPLS domain) then send > it to RRs then RRs will blast those UPDATES to everybody in the domain > for zero reason. > > And the only interested consumer of this info is the controller which > can get such data from NMS, YANG, XML etc .... in the first place. I don't think that's the intended use case. The intended use case is a scenario where: - SAFI-4 is being used anyway, and - multiple ingress nodes need to be able construct to construct traffic-engineered MPLS/SR label stacks that will get a packet, destined to a particular prefix, to the proper egress node, and - when the packet arrives at the egress node, that egress node's label for the prefix should appear at the top of the stack. Assuming that the ingress nodes know the SID for the prefix (via the prefix-SID attribute), they also need to know the SRGB of the egress node in order to determine the egress node's label for the prefix. While this may or may not be a useful use case (so to speak), no one has ever suggested to enable SAFI-4 as a way of having a node signal its SRGB to a controller.
- Re: [Idr] SRGB TLV Eric C Rosen
- [Idr] SRGB TLV Robert Raszuk