Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard
Job Snijders <job@instituut.net> Thu, 20 April 2017 21:09 UTC
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References: <D4E812E8-AA7B-4EA2-A0AC-034AA8922306@juniper.net> <abe393d3-d1e4-7841-4620-38dab751765b@cisco.com> <68B29403-9AD9-4F06-9FE4-3F077E793D9F@puck.nether.net> <275cf744-1f64-bcbc-dabe-a47479921230@cisco.com> <20170420154142.lacvtplusepy3qcf@hanna.meerval.net> <b57162ec-f806-6e86-7713-58608f72c468@cisco.com> <32C0B4EE-6241-49F9-97F2-7107AC68678D@juniper.net> <e513849d-f895-0499-7bf4-5ecb24cadab7@cisco.com> <CA+b+ER=ee6Q59mbctO06P8x2QsTz_me9mL9YcB25O2Ey4+kpdA@mail.gmail.com>
In-Reply-To: <CA+b+ER=ee6Q59mbctO06P8x2QsTz_me9mL9YcB25O2Ey4+kpdA@mail.gmail.com>
From: Job Snijders <job@instituut.net>
Date: Thu, 20 Apr 2017 21:08:55 +0000
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To: Enke Chen <enkechen@cisco.com>, Robert Raszuk <robert@raszuk.net>
Cc: Hares Susan <shares@ndzh.com>, idr wg <idr@ietf.org>
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Subject: Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard
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So a change like bgp-reject will take many years to be deployed within a single network, how can that be reconciled with the perceived "surprise"? Kind regards, Job On Thu, 20 Apr 2017 at 23:05, Robert Raszuk <robert@raszuk.net> wrote: > + > > c) deployment of new code release in large network takes months if not > years > > On Thu, Apr 20, 2017 at 11:03 PM, Enke Chen <enkechen@cisco.com> wrote: > >> Hi, John: >> >> It's not like the issues with software update are new :-) >> >> As we all know, there is a complete lack of uniformity (on a global >> scale) with >> the procedures for software update. As a result, a proposal that assumes >> certain >> procedures is bound to be incomplete, and will not work for some. >> >> As Eric summarized, >> >> --- >> Phasing in a change of behavior over several releases is not a practical >> solution, because: >> >> a) Customers will still be surprised when the default behavior finally >> changes, and >> b) Many customers won't deploy all the releases anyway. >> --- >> >> Thanks. -- Enke >> >> On 4/20/17 11:40 AM, John G. Scudder wrote: >> > Enke, >> > >> > On Apr 20, 2017, at 11:57 AM, Enke Chen <enkechen@cisco.com> wrote: >> > >> >> It depends on the customer base and also how long the software has >> been deployed. >> >> Just think about the scenario that a large number of customers would >> lose network >> >> connectivity unexpectedly due to a default behavior change in the >> code. Such outages >> >> could keep happening to different customers for years to come. >> >> >> >> Perhaps, changing "impossible" to "impractical" :-) >> > >> > Various people have provided worked examples of how they think this >> change could be effected without causing the disruptions you warn of. I've >> pasted one example (from Jared) below. I haven't seen any response or >> acknowledgement from you, to those suggestions, just the repetition of your >> initial concern. I for one don't understand why you think a scheme such as >> Jared describes would be either "impossible" or "impractical". >> > >> > If you are unconvinced about the practicality of such a scheme, it >> would be great if you could describe why. >> > >> > Thanks, >> > >> > --John >> > >> > Jared's message: >> >> On Apr 20, 2017, at 9:40 AM, Jared Mauch <jared@puck.nether.net> >> wrote: >> >> >> >> >> >>> On Apr 19, 2017, at 6:26 PM, Robert Raszuk <robert@raszuk.net> wrote: >> >>> >> >>> Keyur, >> >>> >> >>> You can not set "insecure mode" before you reload the OS as current >> OS does not have such knob. Unless you delay the deployment across N >> releases and enforce sequenced upgrade. >> >> >> >> Infact, this is the recommendation that I’ve provided to vendors that >> have expressed concerns. There are many defaults that have not always been >> displayed, but things like IOS have “show run all” so you can see these. >> >> >> >> Something like the ‘bgp unsafe-ebgp-policy’ could be generated on >> their respective implementations. I didn’t think that GROW/IDR needed to >> tell implementors this level of how to manage their release, so this does >> seem somewhat out of scope, but a concern I can see needs to be thought >> about. >> >> >> >>> The only way to prevent massive reachability failure upon reload due >> to complete silent bgp prefix drop is to configure inbound policy for all >> EBGP sessions before the reload and run with new image. >> >> >> >> Since we’re talking about how to operate a network: >> >> - People who are taking advantage of an undefined behavior will always >> be surprised >> >> - Vendors can take the N+1.x and N+2.x release strategy, where in N >> and N+1 they generate their equivalent of IOS-XR and the "bgp >> unsafe-ebgp-policy” policy to prevent their customers from breaking >> >> - In a release N+2(or more) that would become the “default”. >> >> >> >>> Of course this is all assuming that someone will read carefully the >> release notes :) >> >> >> >> Most people don’t, and I’ve always suggested to vendors they implement >> some sort of incremental approach to resolving this. >> >> >> >> What worries me is that there is a major incumbent provider who >> doesn’t see this as the serious (and well-documented) security issue that >> it is for those operating large networks. >> >> >> >>> If they do not the troubleshooting of this will be really painful ! >> CE will see EBGP session as UP, will get all the routes and will send his >> routes. CE will have no clue if PE dropped or accepted his routes. Likewise >> on the other end .. Only imagine a network which has 10s of thousands of >> VPN CEs as Bruno mentioned and their provider not following all releases >> CEs are running. >> >> >> >> >> >> If they don’t know how to troubleshoot BGP, that isn’t the vendors >> fault. >> >> >> >>> At least doing it as part of OPEN msg will be immediately indicated >> to both ends. >> >> >> >> This is you promoting a different draft, I recommend another thread >> for that draft. >> >> >> >> - Jared >> > ... >> > >> >> _______________________________________________ >> Idr mailing list >> Idr@ietf.org >> https://www.ietf.org/mailman/listinfo/idr >> > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr >
- [Idr] IETF LC for IDR-ish document <draft-ietf-gr… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Acee Lindem (acee)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Keyur Patel
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Acee Lindem (acee)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Acee Lindem (acee)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Keyur Patel
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeff Tantsura
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… i3D.net - Martijn Schmidt
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Dickinson, Ian
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Tony Przygienda
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Alvaro Retana (aretana)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Tony Przygienda
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Eric C Rosen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Eric C Rosen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Eric C Rosen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Eric C Rosen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Nick Hilliard
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jay Borkenhagen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… t.petch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Christopher Morrow
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Christopher Morrow
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Christopher Morrow
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Nick Hilliard
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… bruno.decraene
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… t.petch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeffrey Haas
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Greg Hankins
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeffrey Haas
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeffrey Haas
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Christopher Morrow
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Gert Doering
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeffrey Haas
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jeffrey Haas
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Warren Kumari
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Alexander Azimov
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Joe Provo
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Warren Kumari
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Joe Provo
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Christopher Morrow
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Randy Bush
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Randy Bush
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Randy Bush
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Randy Bush
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Job Snijders
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jared Mauch
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Warren Kumari
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Enke Chen
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Brian Dickson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jakob Heitz (jheitz)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Jakob Heitz (jheitz)
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Robert Raszuk
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Mikael Abrahamsson
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… Alexander Azimov
- Re: [Idr] IETF LC for IDR-ish document <draft-iet… John G. Scudder