Tianran,
On 02/06/2020 10:25, Tianran Zhou wrote:
Peter,
-----Original Message-----
From: Peter Psenak [mailto:ppse...@cisco.com]
Sent: Tuesday, June 2, 2020 4:10 PM
To: Tianran Zhou <zhoutian...@huawei.com>; lsr@ietf.org
Subject: Re: [Lsr] I-D Action: draft-ietf-ospf-mpls-elc-15.txt
Tianran,
On 02/06/2020 08:14, Tianran Zhou wrote:
Hi Peter,
I do not understand how RFC8667 relates to ELC signaling.
RFC 8667 - IS-IS Extensions for Segment Routing
RFC 8667 "have been defined to signal labels", but "This draft defines a mechanism
to signal the ELC using IS-IS."
yes, and as labels are now signaled by IGPs, we provide a method to signal
ELC/ERLD by IGPs as well.
ZTR> RFC8667 signals different SID.
no, RFC8667 is ISIS extension for SR MPLS.
But draft-ietf-ospf-mpls-elc is about entropy label. Or do you mean entropy
label is also signaled by IGP?
no, entropy label is not signaled AFAIK.
On the other hand, RFC 8667 is the extension for segment routing.
Is this draft only for segment routing, or be generic?
the requirement document is RFC8662, which is SR specific.
ZTR> "This draft" I mean draft-ietf-ospf-mpls-elc. So is
draft-ietf-ospf-mpls-elc SR specific?
SR was a primary motivation.
regards,
Peter
Thanks,
Tianran
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."
multi area is single IGP with multiple areas. Mutli domain is multiple IGPs.
thanks,
Peter
Tianran
-----Original Message-----
From: Peter Psenak [mailto:ppse...@cisco.com]
Sent: Monday, June 1, 2020 6:56 PM
To: Tianran Zhou <zhoutian...@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-boun...@ietf.org] On Behalf Of
internet-dra...@ietf.org
Sent: Monday, June 1, 2020 4:42 PM
To: i-d-annou...@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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