Re: [Idr] BGP Auto-Discovery Protocol State Requirements
Robert Raszuk <robert@raszuk.net> Tue, 23 March 2021 13:23 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 23 Mar 2021 14:23:32 +0100
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To: Jeffrey Haas <jhaas@pfrc.org>
Cc: "Fomin, Sergey (Nokia - US/Mountain View)" <sergey.fomin@nokia.com>, "idr@ietf.org" <idr@ietf.org>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>
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Subject: Re: [Idr] BGP Auto-Discovery Protocol State Requirements
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Hi Jeff, > As noted in the thread, the important property a protocol must design for is > how you handle retries. As this point is being brought back again let's zoom on it a bit here. Clearly the above indicates changes of "handling retries" to current RFC4271. So I assume you possess some operational evidence which would lead to suggest that if peer IP address is learned via auto discovery we need to apply a different BGP OPEN retry procedure or at least timers then if the same peer's IP address is pushed by cfg from mgmt station. Can you share this data ? If not could you please describe how auto discovered peers would need to have different BGP FSM then say those configured with mistakes. To me this difference is not obvious. Now let's see if the same concerns or observations apply if you limit auto discovery to *only* same L2 domain. Last the draft says: "The auto-discovery mechanism will not replace or conflict with data exchanged by the BGP FSM, including its OPEN message." But if you are thinking about modifications of handling BGP session retries then I guess the above needs to have one exception added. Then we will see different OPEN behaviour depending if peer got auto discovered vs provisioned ... Many thx, R. On Tue, Mar 23, 2021 at 12:43 PM Jeffrey Haas <jhaas@pfrc.org> wrote: > Sergey, > > On Tue, Mar 23, 2021 at 04:28:17AM +0000, Fomin, Sergey (Nokia - > US/Mountain View) wrote: > > > The motivation for the broader analysis of auto configuration was to > make sure we don't have to completely reinvent this stuff a second round. > :-) > > > > Maybe we should revisit the scope definition then? > > > > I have to agree with Robert on this one. > > > > Either we are trying to solve a DC underlay discovery use case, or > something else. > > From the transport requirements for BGP sessions, what would you subtract > that you think isn't DC specific? > > > > Having it in the discovery protocol doesn't impact that if your > implementation doesn't want to use it. > > > > It may bring unnecessary complexity (depending on protocol design). > Especially given the “MUST” requirement. > > > > "The auto-discovery mechanism is designed to be simple.", says section > 2.2 of the draft.. > > The writeup for this thread shows a split: Transport requirements to even > get BGP to come up. Session parameters either in the discovery protocol, > or > discovered when you bring up your BGP FSM and you receive an OPEN. > > As noted in the thread, the important property a protocol must design for > is > how you handle retries. > > > > If your configuration template doesn't have security configured, but > it is required by the auto-discovery advertiser, your implementation would > try to open a bgp session and that would fail. > > > > And that might be just fine? Again, if we talk about a DC under a single > administrative entity; and expect that other ZTP/configuration provisioning > mechanisms are already in-place. > > This is a valid opinion. > > End of the day, the requirements are motivated by how do you make auto > configuration able to be done. If the working group decides that certain > types of misconfigurations (and thus less "auto") are acceptable, so be it. > But it won't be done blindly because the issue has not been considered. > You > simply get to justify it to your customers. > > -- Jeff >
- [Idr] BGP Auto-Discovery Protocol State Requireme… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Tony Przygienda
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Acee Lindem (acee)
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Tony Przygienda
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Tony Przygienda
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Fomin, Sergey (Nokia - US/Mountain View)
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Robert Raszuk
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… heasley
- Re: [Idr] BGP Auto-Discovery Protocol State Requi… Jeffrey Haas