Hi Bruno,
Thank you very much for your valuable comments.
My responses/explanations are inline below with [HC].
Best Regards,
Huaimo
on behalf of co-authors
________________________________
From: bruno.decra...@orange.com <bruno.decra...@orange.com>
Sent: Tuesday, February 8, 2022 6:01 AM
To: draft-hu-spring-segment-routing-proxy-forward...@ietf.org
<draft-hu-spring-segment-routing-proxy-forward...@ietf.org>
Cc: SPRING WG <spring@ietf.org>
Subject: RE: WG adoption call - draft-hu-spring-segment-routing-proxy-forwarding
[speaking as WG contributor]
Hi authors, all
I have some comments specific to the binding SID aspect.
§2
“ For a binding segment of a possible failed node, the node advertises
the information about the binding segment, including the binding SID
and the list of SIDs associated with the binding SID, to its direct
neighbors only. Note that the information is not advertised in the
network domain. »
§3.2.2
“For supporting binding SID proxy forwarding, a new IS-IS TLV, called
Binding Segment TLV, is defined. It contains a binding SID and a
list of segments (SIDs). This TLV may be advertised in IS-IS Hello
(IIH) PDUs, LSPs, or in Circuit Scoped Link State PDUs (CS-LSP)
[RFC7356<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc7356&data=04%7C01%7Chuaimo.chen%40futurewei.com%7C3bdfa9878fe446f8400c08d9eaf25fb3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637799148995699216%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bQ9%2FdRR2rDhNWV4KYFkKhJ%2BO8xzw6d7JU9ZNc%2Btg3zU%3D&reserved=0>].
»
>From an IS-IS standpoint, it seems to me that:
- Advertising it in the LSP PDU would flood the information in the whole
area/level, hence does not match the goal stated in §2
- Advertising it in the Hello PDU is not a reliable way to sync information
(except if duplicated in all hello which implies others issues such as lack of
space) and adding the reliability seem like a major change to IS-IS
In all cases, as already raised by Stéphane, this is a subject for the LSR WG.
[HC]: We will remove IS-IS Hello (IIH) PDUs and LSPs, and update the
related text accordingly.
More importantly, the binding SIDs are probably coming from “somewhere” such as
configuration, PCE, BGP, BGP-LS… Why not using the exact same signaling to
duplicate it on the neighbors? (this may probably require some extensions for
some protocols but a priori light ones and would not impact the IGP with
information which may not belong to the IGP.)
[HC]: Using the same signaling (configuration, PCE, or BGP, ...) to
duplicate it on the neighbors works well if there are sessions between
the neighbors and PCE, or BGP, ...
Thanks,
Regards,
--Bruno
Orange Restricted
From: spring <spring-boun...@ietf.org> On Behalf Of bruno.decra...@orange.com
Sent: Thursday, January 13, 2022 11:19 AM
To: SPRING WG <spring@ietf.org>
Subject: [spring] WG adoption call -
draft-hu-spring-segment-routing-proxy-forwarding
Dear WG,
This message starts a 2 week WG adoption call, ending 27/01/2022, for
draft-hu-spring-segment-routing-proxy-forwarding
https://datatracker.ietf.org/doc/draft-hu-spring-segment-routing-proxy-forwarding/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-hu-spring-segment-routing-proxy-forwarding%2F&data=04%7C01%7Chuaimo.chen%40futurewei.com%7C3bdfa9878fe446f8400c08d9eaf25fb3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637799148995699216%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=pkRnDva6Nk0r10gE7Z3Nj1e7w6Rz187cj6gsrJ5aBrk%3D&reserved=0>
After review of the document please indicate support (or not) for WG adoption
of the document to the mailing list.
Please also provide comments/reasons for your support (or lack thereof) as this
is a stronger way to indicate your (non) support as this is not a vote.
If you are willing to work on or review the document, please state this
explicitly. This gives the chairs an indication of the energy level of people
in the working group willing to work on the document.
Thanks!
Bruno, Jim, Joel
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