[Lsr] Re: About Premature aging of LSA and Purge LSA

Thu, 11 Jul 2024 19:45:56 -0700

No. It sounds non-practical.

The “Stale DB Exchange List” that you proposed exists only on the neighbors of the restarting router, right?

Then, will it introduce inconsistency LSDB and SPF calculations results among the routers that locates far beyond the neighbors of the restarting router and these direct connected routers?

And, your proposal needs the changes of the state machines of the current OSPF implementation, it is unconvinced that you call them “simpler”.

Aijun Wang
China Telecom

On Jul 11, 2024, at 23:28, Acee Lindem <[email protected]> wrote:

As WG member: 

On Jul 11, 2024, at 05:29, Aijun Wang <[email protected]> wrote:

And, there is also another draft aims to solve the similar problem https://datatracker.ietf.org/doc/html/draft-cheng-lsr-ospf-adjacency-suppress-02, which it declares similar with the solution in IS-IS.   Why not take this approach?

Because this one doesn’t require any signaling and can accomplished via local behavior without requiring support from any other OSPF router. Additionally, it is simpler.. Well, at least for someone who has a deep understanding of the protocol. 

Thanks, 
Acee



 
 
Best Regards
 
Aijun Wang
China Telecom
 
发件人: [email protected] [mailto:[email protected]] 代表 Aijun Wang
发送时间: 2024年7月11日 17:20
收件人: 'Acee Lindem' <[email protected]>
抄送: 'Peter Psenak' <[email protected]>; 'Yingzhen Qu' <[email protected]>; 'lsr' <[email protected]>; 'lsr-chairs' <[email protected]>; 'tony Przygienda' <[email protected]>; 'shraddha' <[email protected]>
主题: [Lsr] 答复: Re: About Premature aging of LSA and Purge LSA
 
For the neighbors of the restarting router, why can’t they delete directly the LSAs that originated by the restarting router instead of putting them into one “Stale DB Exchange list” when they detect their neighbor is down?
 
发件人: [email protected] [mailto:[email protected]] 代表 Acee Lindem
发送时间: 2024年7月10日 22:14
收件人: Aijun Wang <[email protected]>
抄送: Peter Psenak <[email protected]>; Yingzhen Qu <[email protected]>; lsr <[email protected]>; lsr-chairs <[email protected]>; tony Przygienda <[email protected]>; shraddha <[email protected]>
主题: [Lsr] Re: About Premature aging of LSA and Purge LSA
 
Yes - but the whole discussion of adjacency suppression and database synchronization is based on preventing TEMPORARY usage of stale LSAs leading to false bidirectional adjacencies during unplanned restart. RFC 2328 OSPF will converge without any modifications - there can just be transient traffic drops and/or loops. 
 
Thanks,
Acee
On Jul 9, 2024, at 20:42, Aijun Wang <[email protected]> wrote:
 
For the unplanned restart, shouldn’t the responsibility of the directed connect neighbors to send out such LSAs for the purge of obsolete LSA?
 
 
Best Regards
 
Aijun Wang
China Telecom
 
发件人: [email protected] [mailto:[email protected]] 代表 Acee Lindem
发送时间: 2024年7月9日 20:14
收件人: Peter Psenak <[email protected]>
抄送: Aijun Wang <[email protected]>; Yingzhen Qu <[email protected]>; lsr <[email protected]>; lsr-chairs <[email protected]>; tony Przygienda <[email protected]>; shraddha <[email protected]>
主题: [Lsr] Re: About Premature aging of LSA and Purge LSA
 
Additionally, you certainly don’t need a standards track solution to this problem. An implementation could honor MinLSInterval by simply locally keeping its own list of self-originated MaxAge LSAs and delaying reorigination.
 
Thanks,
Acee 



On Jul 9, 2024, at 04:13, Peter Psenak <[email protected]> wrote:
 
Aijun,
 
On 09/07/2024 09:46, Aijun Wang wrote:
Hi, Acee:
 
Can the proposal in https://datatracker.ietf.org/doc/html/draft-dong-ospf-purge-lsa-00, together with https://datatracker.ietf.org/doc/html/rfc2328#section-14.1(Premature aging of LSAs) solve your mentioned problem?
If so, is it simpler than your proposal? 
That is, before the router restart, it needs only send out the Purge LSA(when LSA sequence number is not to wrap) or premature aging of its LSA.(when sequence number is to wrap)

does not work for unplanned restart.

thanks,
Peter

 
Best Regards
 
Aijun Wang
China Telecom
 
发件人: [email protected] [mailto:[email protected]] 代表 Acee Lindem
发送时间: 2024年7月9日 3:58
收件人: Yingzhen Qu <[email protected]>
抄送: lsr <[email protected]>; lsr-chairs <[email protected]>; tony Przygienda <[email protected]>; shraddha <[email protected]>
主题: [Lsr] Re: IETF 120 LSR Slot Requests
 
Speaking as WG member:
 
I would like a 10 minute slot to present an update to https://datatracker.ietf.org/doc/draft-hegde-lsr-ospf-better-idbx/
 
Thanks,
Acee




On Jun 25, 2024, at 14:19, Yingzhen Qu <[email protected]> wrote:
 
Hi,

The draft agenda for IETF 120 has been posted:
 
The LSR session is scheduled on Friday Session I1 9:30 - 11:30, July 26, 2024.
 
Please send slot requests to [email protected] before the end of the day Wednesday July 10th.  Please include draft name and link, presenter, desired slot length including Q&A. 
 
Please note that having a discussion on the LSR mailing list is a prerequisite for a draft presentation in the WG session. If you need any help please reach out to the chairs.
 
Thanks,
Yingzhen

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