Hi Zhang, Tony, 

> On Mar 2, 2026, at 2:10 AM, Tony Li <[email protected]> wrote:
> 
> 
> Hi Zhang Li,
> 
> Perhaps I’m not understanding the problem that you’re trying to solve. It 
> seems to me that what you’re suggesting is that we create a special encoding 
> to handle the case where someone has multiple VLANs over one link between two 
> routers.  Is that correct?  Why would anyone want to do that?  I

This is a common way to include an interface in multiple areas in OSPFv2. I 
expect it is used in OSPFv3 as well since people don't know how to configure 
different Instance IDs.


> dislike adding hair to the protocol over a situation that should not exist.

I haven't read the draft but I don't see why it makes any difference to the 
IGPs and agree. 

Thanks,
Acee


> 
> Regards,
> Tony
> 
> 
>> On Mar 1, 2026, at 6:56 PM, zhangli (CE) - zhangli344=40huawei.com at 
>> dmarc.ietf.org <[email protected]> wrote:
>> 
>> Dear all,
>> 
>> A new document draft-zl-lsr-igp-sub-interface-relationship-00 has been 
>> submitted. This draft introduces extensions to IGP, allowing a network 
>> device to advertise the relationship between a physical interface and its 
>> sub-interfaces. These extensions enable the links based on sub-interfaces to 
>> participate in the alternative paths for load balancing. 
>> 
>> Links for the draft is as below.
>> 
>> https://datatracker.ietf.org/doc/draft-zl-lsr-igp-sub-interface-relationship/
>> 
>> Looking forward to your review and comments.
>> 
>> Best regards
>> Li
>> -----邮件原件-----
>> 发件人: [email protected] <[email protected]> 
>> 发送时间: 2026年2月28日 17:12
>> 收件人: lichenxi (A) <[email protected]>; Dongjie (Jimmy) 
>> <[email protected]>; zhangli (CE) <[email protected]>
>> 主题: New Version Notification for 
>> draft-zl-lsr-igp-sub-interface-relationship-00.txt
>> 
>> A new version of Internet-Draft
>> draft-zl-lsr-igp-sub-interface-relationship-00.txt has been successfully 
>> submitted by Li Zhang and posted to the IETF repository.
>> 
>> Name:     draft-zl-lsr-igp-sub-interface-relationship
>> Revision: 00
>> Title:    IGP Extensions for Sub-interface Relationship Information
>> Date:     2026-02-28
>> Group:    Individual Submission
>> Pages:    8
>> URL:      
>> https://www.ietf.org/archive/id/draft-zl-lsr-igp-sub-interface-relationship-00.txt
>> Status:   
>> https://datatracker.ietf.org/doc/draft-zl-lsr-igp-sub-interface-relationship/
>> HTML:     
>> https://www.ietf.org/archive/id/draft-zl-lsr-igp-sub-interface-relationship-00.html
>> HTMLized: 
>> https://datatracker.ietf.org/doc/html/draft-zl-lsr-igp-sub-interface-relationship
>> 
>> 
>> Abstract:
>> 
>>  This document extends ISIS and OSPF, allowing a network device to
>>  advertise the relationship between a physical interface and its sub-
>>  interfaces.  This extension enables the links based on sub-interfaces
>>  to participate in the alternative paths for load balancing in SRv6 BE
>>  bandwidth polling.
>> 
>> 
>> 
>> The IETF Secretariat
>> 
>> 
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