BGP Encapsulation SAFI and BGP Tunnel Encapsulation Attribute

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BGP Encapsulation SAFI and BGP Tunnel
Encapsulation Attribute

• draft-pmohapat-idr-info-safi-02.txt

Pradosh Mohapatra and Eric Rosen Cisco
Systems IETF-69, July 26, 2007
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The story so far

• Prior versions of this draft describe a BGP-based
  approach to signal encapsulation information
  between edge routers
• NLRI ltendpoint IP address distinguishergt
• Defined a tunnel encapsulation attribute that has
  a TLV format (and sub-TLVs) to encode the
  encapsulation parameters.
• Defined tunnel encapsulation format for L2TPv3
  and GRE.

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Changes from -00 version(based on comments)

• Renamed to encap-SAFI to better indicate
  intended usage.
• Use of encap-SAFI restricted to cases where AFI
  is either IPv4 or IPv6.
• NLRI simplified by removal of distinguisher
  field. Clarified that the NLRI is defined by a
  combination of ltAFI, SAFIgt (consistent with
  draft-ietf-idr-v4nlri-v6nh).
• Reworked the abstract and introduction sections
  to give clear explanation of when encap-SAFI is
  and is not useful.

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Changes from -00 version (based on comments)

• Justification for use of encap-SAFI (rather than
  new attribute) given
• Justification for use of single SAFI covering
  multiple encapsulations, rather than one SAFI per
  encapsulation given.
• Clarification of processing by a BGP speaker that
  does not understand some sub-TLV.
• New opaque extended community defined can be
  used in cases where encap-SAFI is not really
  needed (i.e. no encapsulation parameters to
  signal).

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Next steps

• WG document?
• Referenced by softwires mesh framework, like
  draft-ietf-idr-v4nlri-v6nh.