Re: [Lsr] I-D Action: draft-ietf-ospf-mpls-elc-15.txt

Hi Peter,

I do not understand how RFC8667 relates to ELC signaling.
RFC 8667 "have been defined to signal labels", but "This draft defines a mechanism to signal the ELC using IS-IS."

On the other hand, RFC 8667 is the extension for segment routing. 
Is this draft only for segment routing, or be generic?

Another thing I am not clear is the difference between "multi-area" and "multi-domain" here after:
   "Even though ELC is a property of the node, in some cases it is
   advantageous to associate and advertise the ELC with a prefix.  In a
   multi-area network, routers may not know the identity of the prefix
   originator in a remote area, or may not know the capabilities of such
   originator.  Similarly, in a multi-domain network, the identity of
   the prefix originator and its capabilities may not be known to the
   ingress LSR."

Tianran

-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com] 
Sent: Monday, June 1, 2020 6:56 PM
To: Tianran Zhou <zhoutianran@huawei.com>; lsr@ietf.org
Subject: Re: [Lsr] I-D Action: draft-ietf-ospf-mpls-elc-15.txt

Tianran,

On 01/06/2020 12:49, Tianran Zhou wrote:
> Hi Authors,
> 
> I see the following words in the introduction.
> "   Recently, mechanisms have been defined to signal labels via link-
>     state Interior Gateway Protocols (IGP) such as IS-IS [RFC8667].  "
> 
> It's not clear to me what the " mechanisms " are. Could you please add some reference or text on this?

the reference is there - RFC8667.

thanks,
Peter

> 
> Thanks,
> Tianran
> 
> -----Original Message-----
> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.org
> Sent: Monday, June 1, 2020 4:42 PM
> To: i-d-announce@ietf.org
> Cc: lsr@ietf.org
> Subject: [Lsr] I-D Action: draft-ietf-ospf-mpls-elc-15.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Link State Routing WG of the IETF.
> 
>          Title           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using OSPF
>          Authors         : Xiaohu Xu
>                            Sriganesh Kini
>                            Peter Psenak
>                            Clarence Filsfils
>                            Stephane Litkowski
>                            Matthew Bocci
> 	Filename        : draft-ietf-ospf-mpls-elc-15.txt
> 	Pages           : 9
> 	Date            : 2020-06-01
> 
> Abstract:
>     Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
>     balance traffic flows using Entropy Labels (EL).  An ingress Label
>     Switching Router (LSR) cannot insert ELs for packets going into a
>     given Label Switched Path (LSP) unless an egress LSR has indicated
>     via signaling that it has the capability to process ELs, referred to
>     as the Entropy Label Capability (ELC), on that LSP.  In addition, it
>     would be useful for ingress LSRs to know each LSR's capability for
>     reading the maximum label stack depth and performing EL-based load-
>     balancing, referred to as Entropy Readable Label Depth (ERLD).  This
>     document defines a mechanism to signal these two capabilities using
>     OSPFv2 and OSPFv3 and BGP-LS.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-ospf-mpls-elc-15
> https://datatracker.ietf.org/doc/html/draft-ietf-ospf-mpls-elc-15
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-mpls-elc-15
> 
> 
> Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> 
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