Re: [Idr] IDR heads up on BESS draft: BGP for SFC: draft-mackie-bess-nsh-bgp-control-plane-04.txt

Tony Przygienda <tonysietf@gmail.com> Fri, 17 February 2017 00:16 UTC

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From: =?UTF-8?B?VG9ueSBQcnp5Z2llbmRh?= <tonysietf@gmail.com>
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Discounted for same affiliation with the authors 😏 I do think personally it's a symmetrical, quite elegant and low risk/effort draft given how successful equivalent BGP "low level network service access point" synchronization proposals were over last years ...



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Thursday, February 16, 2017, 13:25 -0800 from Adrian Farrel  <adrian@olddog.co.uk>uk>:
>Hi IDR,
>
>We have an I-D in BESS (also discussed in SFC) that proposes to use BGP as a
>control plane for and SFC (overlay) network.
>
>You can best grasp the proposed extensions to BGP by looking at the I-D. We
>think the extensions are natural and relatively small, by YMMV :-)
>
>Completely understanding what we are planning may be hard without some
>background in service function chaining, but from 30,000 ft...
>
>An SFC network is an overlay network.
>Service Function Forwarders (SFFs) are connected by tunnels over one or more
>underlay networks.
>SFFs provide access to Service Function Instances (SFIs)
>SFIs are strung together in an ordered sequence called a Service Function Path
>(SFP) [an instance of a Service Function Chain (SFC)]
>It used to be that service functions were installed as physical bumps in the
>wire, but now they may be remote and virtualized.
>Packets that need to be acted on by a series of service functions (an SFC) are
>classified by a Classifier and assigned to an SFP.
>The packets are marked (with an additional encapsulation header) and passed from
>SFF to SFF for delivery to the SFIs.
>
>Our approach uses BGP so that:
>- SFFs can advertise which SFIs they provide access to so that a controller can
>build SFPs
>- a controller to advertise the various SFPs so that SFFs can work out how to
>deliver 
>   packets to the right SFIs, and how to route packets to the correct next SFF
>- a controller to instruct a Classifier on how to select the right SFP
>
>We also help the SFF know what tunnel to use to reach the next SFF, and what SFC
>encapsulation to use on each hop.
>
>For more details, read the draft :-)
>
>Discussions should probably be on the BESS list, but we will probably also spot
>them if they happen here.
>
>Thanks,
>Adrian
>
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