Re: [Idr] WG adoption for draft-haas-flowspec-capability-bits - 3/30 to 4/13

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Fri, 09 April 2021 00:36 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>
CC: "idr@ietf. org" <idr@ietf.org>
Thread-Topic: [Idr] WG adoption for draft-haas-flowspec-capability-bits - 3/30 to 4/13
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Date: Fri, 9 Apr 2021 00:36:01 +0000
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Subject: Re: [Idr] WG adoption for draft-haas-flowspec-capability-bits - 3/30 to 4/13
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This makes sense.

You should probably modify or delete section 4.

A BGP speaker has basically 2 jobs. 1. to propagate a received route to other neighbors and 2. to act on the route (install the filter). A BGP capability advertised by a router is only known to the neighbor of that router, not necessarily to the originator of a route. Therefore, BGP capabilities are an insufficient means to discover the capabilities of all routers in a network. All that BGP capabilities can really do is to prevent a neighbor from tearing down a BGP session when you send it a route it does not recognize (by enabling you to not send the unrecognized route in the first place). To find out how many routers in your network will install a given flowspec requires more capable network management techniques.


Regards,
Jakob.

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Jeffrey Haas
Sent: Thursday, April 8, 2021 3:43 AM
To: Robert Raszuk <robert@raszuk.net>
Cc: idr@ietf. org <idr@ietf.org>rg>; Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] WG adoption for draft-haas-flowspec-capability-bits - 3/30 to 4/13

On Thu, Apr 08, 2021 at 09:36:01AM +0200, Robert Raszuk wrote:
> Hi Jeff,
> 
> Looks like we have converged.
> 
> Would it be possible to include your below sentence explicitly/verbatim in
> the draft:
> 
> "It is also an option for an implementation that understands a new component
> that doesn't want to implement it in forwarding to advertise support for
> that component and propagate it even if it doesn't locally use it. "
> 
> With that I am happy as that was my point. And of course anyone is free to
> do what they like (both implementation and operation wise). The draft/rfc
> will only provide options.

I'm happy to add some text to this effect.

-- Jeff

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