Re: [OSPF] FW: OSPF Link Overload - draft-hegde-ospf-link-overload-01
"Acee Lindem (acee)" <acee@cisco.com> Tue, 29 September 2015 03:01 UTC
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] FW: OSPF Link Overload - draft-hegde-ospf-link-overload-01
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Date: Tue, 29 Sep 2015 03:01:34 +0000
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Subject: Re: [OSPF] FW: OSPF Link Overload - draft-hegde-ospf-link-overload-01
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Hi Shraddha, This was two and there were, at least, two responses. Please refer to the archive: https://mailarchive.ietf.org/arch/search/?email_list=ospf Thanks, Acee On 9/28/15, 10:56 PM, "OSPF on behalf of Shraddha Hegde" <ospf-bounces@ietf.org on behalf of shraddha@juniper.net> wrote: >Resending to mailing list as I didn't see it delivered in last posting... > >Rgds >Shraddha > >-----Original Message----- >From: Shraddha Hegde >Sent: Monday, September 28, 2015 10:43 AM >To: 'Acee Lindem (acee)' <acee@cisco.com>; OSPF WG List <ospf@ietf.org> >Cc: Pushpasis Sarkar <psarkar@juniper.net>; Hannes Gredler ><hannes@gredler.at>; 'Mohan Nanduri' <mnanduri@microsoft.com>; 'Jalil, >Luay' <luay.jalil@verizon.com> >Subject: RE: OSPF Link Overload - draft-hegde-ospf-link-overload-01 > >Acee, > >Thanks for picking up the draft for adoption. > >I believe this draft is very useful in automating the link upgrade >process and software upgrade process in overlay deployments and hence >support WG adoption as co-author. > >I would like to take this opportunity to discuss few of the points >raised during Prague meeting. > >1. Whether to keep the "Link overload" advertisement at area level or at >link level. > >In controller based deployments, it's useful to advertise the impending >maintenance of the link to the controller so that controller can take >Special actions based on the information. The use case is described in >sec 5.2 in the draft. >The draft advocates increasing the metric to usable high metric on both >ends of the link. This is for backwards compatibility and to avoid need >of flag Day upgrade on all nodes. > > Controller cannot assign special meaning to the metric for ex: Metric >XXXX means the link going for maintenance and take different actions >based on metric. > >For a completely automated upgrade process, controller would need a fine >grained and specific information that the link is going for maintenance >so that the services that use the particular link find a different path >forcefully while keeping the entire process non-disruptive. > > >2. Use of high metric on either side of the link to divert the traffic. > >As I already mentioned before, draft advocates raising the reverse metric >to a high metric but that is for backwards compatibility and to avoid >Need for flag-day upgrade. There were suggestions at the Prague meeting >to use lower bandwidth advertisements as well as removal of Link >characteristics to force the services on different path. These mechanisms >would be disruptive and defeats the purpose of the draft. > >3. Backward compatibility > >"Link-overload" is a new information attached to a link and is very >similar to a new constraint being added to the link. >This information is non-invasive in the sense that services that do not >want to look at the new constraint (link overload) May depend only on the >metric to take specific actions. > >Whereas services that have specialized requirement of providing >non-disruptive upgrades can do so by processing the new constraint. > >Section 4 in the draft talks about backwards compatibility. >I'll add more clarifications in the coming days. > >Rgds >Shraddha > > >-----Original Message----- >From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem (acee) >Sent: Saturday, September 26, 2015 6:05 AM >To: OSPF WG List <ospf@ietf.org> >Subject: [OSPF] OSPF Link Overload - draft-hegde-ospf-link-overload-01 > >In Prague, there was consensus in the room that this use case was not >covered by existing mechanisms and that it was a problem the WG should >solve. There were differing opinions as to the exact solution but that >should not preclude OSPF WG adoption. > >Please indicate your support (or concerns) for adopting this as a WG >Document. > > >Thanks, >Acee > > >_______________________________________________ >OSPF mailing list >OSPF@ietf.org >https://www.ietf.org/mailman/listinfo/ospf > >_______________________________________________ >OSPF mailing list >OSPF@ietf.org >https://www.ietf.org/mailman/listinfo/ospf
- [OSPF] OSPF Link Overload - draft-hegde-ospf-link… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Les Ginsberg (ginsberg)
- [OSPF] FW: OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] FW: OSPF Link Overload - draft-hegde-o… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Ahmed Bashandy (bashandy)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Les Ginsberg (ginsberg)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Les Ginsberg (ginsberg)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Anil Kumar S N (VRP Network BL)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Uma Chunduri
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Pushpasis Sarkar
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Manav Bhatia
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Anil Kumar S N (VRP Network BL)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Shraddha Hegde
- Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-… Acee Lindem (acee)