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BIER support via ISIS
draft-ietf-bier-isis-extensions-10

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 8401.
Authors Les Ginsberg , Tony Przygienda , Sam Aldrin , Zhaohui (Jeffrey) Zhang
Last updated 2018-03-27 (Latest revision 2018-03-12)
Replaces draft-przygienda-bier-isis-ranges
RFC stream Internet Engineering Task Force (IETF)
Formats
Reviews
Additional resources Mailing list discussion
Stream WG state Submitted to IESG for Publication
Other - see Comment Log
Document shepherd Hooman Bidgoli
Shepherd write-up Show Last changed 2018-02-01
IESG IESG state Became RFC 8401 (Proposed Standard)
Consensus boilerplate Yes
Telechat date (None)
Needs a YES. Needs 9 more YES or NO OBJECTION positions to pass.
Responsible AD Alvaro Retana
Send notices to Hooman Bidgoli <hooman.bidgoli@nokia.com>, aretana.ietf@gmail.com
IANA IANA review state Version Changed - Review Needed
draft-ietf-bier-isis-extensions-10
Internet-Draft       draft-ietf-bier-isis-extensions          March 2018

   SHOULD treat the advertising router as incapable of supporting BIER
   (one way of handling incapable routers is documented in section 6.9
   of [RFC8279] and additional methods may be defined in the future).

6.2.  BIER MPLS Encapsulation sub-sub-TLV

   This sub-sub-TLV carries the information for the BIER MPLS
   encapsulation including the label range for a specific bitstring
   length for a certain <MT,SD>.  It is advertised within the BIER Info
   sub-TLV (Section 6.1) . This sub-sub-TLV MAY appear multiple times
   within a single BIER info sub-TLV.

   If the same Bitstring length is repeated in multiple sub-sub-TLVs
   inside the same BIER Info Sub-TLV, the BIER Info sub-TLV MUST be
   ignored.

   Label ranges within all BIER MPLS Encapsulation sub-sub-TLVs across
   all BIER Info sub-TLVs advertised by the same BFR MUST NOT overlap.
   If overlap is detected, the advertising router MUST be treated as if
   it did not advertise any BIER sub-TLVs.

   Label values MUST NOT match any of the reserved values defined in
   [RFC3032]

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |    Type       |   Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Max SI      |BS Len |                    Label              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type:  value of 1 indicating MPLS encapsulation.

   Length:  4

   Max SI  Maximum Set Identifier (section 1 of [RFC8279]) used in the
      encapsulation for this BIER sub-domain for this bitstring length,
      1 octet.  Each SI maps to a single label in the label range.  The
      first label is for SI=0, the second label is for SI=1, etc.  If
      the label associated with the Maximum Set Identifier exceeds the
      20 bit range the sub-sub-TLV MUST be ignored.

   Local BitString Length (BS Len):  Encoded bitstring length as per
      [RFC8296]. 4 bits.

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   Label:  First label of the range, 20 bits.  The labels are as defined
      in [RFC8296].

7.  Security Considerations

   Security concerns for IS-IS are addressed in [RFC5304] and [RFC5310].
   Advertisement of the additional information defined in this document
   introduces no new security concerns.

   BIER specific security considerations are discussed in [RFC8279].

8.  Acknowledgements

   The RFC is aligned with the
   [I-D.draft-ietf-bier-ospf-bier-extensions-15] draft as far as the
   protocol mechanisms overlap.

   Many thanks for comments from (in no particular order) Hannes
   Gredler, Ijsbrand Wijnands, Peter Psenak and Chris Bowers.

9.  References

9.1.  Normative References

   [RFC1195]  Callon, R., "Use of OSI IS-IS for routing in TCP/IP and
              dual environments", RFC 1195, DOI 10.17487/RFC1195,
              December 1990, <https://www.rfc-editor.org/info/rfc1195>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3032]  Rosen, E., Tappan, D., Fedorkow, G., Rekhter, Y.,
              Farinacci, D., Li, T., and A. Conta, "MPLS Label Stack
              Encoding", RFC 3032, DOI 10.17487/RFC3032, January 2001,
              <https://www.rfc-editor.org/info/rfc3032>.

   [RFC5120]  Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi
              Topology (MT) Routing in Intermediate System to
              Intermediate Systems (IS-ISs)", RFC 5120,
              DOI 10.17487/RFC5120, February 2008,
              <https://www.rfc-editor.org/info/rfc5120>.

   [RFC5304]  Li, T. and R. Atkinson, "IS-IS Cryptographic
              Authentication", RFC 5304, DOI 10.17487/RFC5304, October
              2008, <https://www.rfc-editor.org/info/rfc5304>.

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   [RFC5305]  Li, T. and H. Smit, "IS-IS Extensions for Traffic
              Engineering", RFC 5305, DOI 10.17487/RFC5305, October
              2008, <https://www.rfc-editor.org/info/rfc5305>.

   [RFC5308]  Hopps, C., "Routing IPv6 with IS-IS", RFC 5308,
              DOI 10.17487/RFC5308, October 2008,
              <https://www.rfc-editor.org/info/rfc5308>.

   [RFC5310]  Bhatia, M., Manral, V., Li, T., Atkinson, R., White, R.,
              and M. Fanto, "IS-IS Generic Cryptographic
              Authentication", RFC 5310, DOI 10.17487/RFC5310, February
              2009, <https://www.rfc-editor.org/info/rfc5310>.

   [RFC7794]  Ginsberg, L., Ed., Decraene, B., Previdi, S., Xu, X., and
              U. Chunduri, "IS-IS Prefix Attributes for Extended IPv4
              and IPv6 Reachability", RFC 7794, DOI 10.17487/RFC7794,
              March 2016, <https://www.rfc-editor.org/info/rfc7794>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

9.2.  Informative References

   [I-D.draft-ietf-bier-ospf-bier-extensions-15]
              Psenak et al., P., "OSPF Extension for Bit Index Explicit
              Replication", internet-draft draft-ietf-bier-ospf-bier-
              extensions-15, February 2018.

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

   [RFC8279]  Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A.,
              Przygienda, T., and S. Aldrin, "Multicast Using Bit Index
              Explicit Replication (BIER)", RFC 8279,
              DOI 10.17487/RFC8279, November 2017,
              <https://www.rfc-editor.org/info/rfc8279>.

   [RFC8296]  Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A.,
              Tantsura, J., Aldrin, S., and I. Meilik, "Encapsulation
              for Bit Index Explicit Replication (BIER) in MPLS and Non-
              MPLS Networks", RFC 8296, DOI 10.17487/RFC8296, January
              2018, <https://www.rfc-editor.org/info/rfc8296>.

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Authors' Addresses

   Les Ginsberg (editor)
   Cisco Systems
   510 McCarthy Blvd.
   Milpitas, CA  95035
   USA

   Email: ginsberg@cisco.com

   Tony Przygienda
   Juniper Networks

   Email: prz@juniper.net

   Sam Aldrin
   Google
   1600 Amphitheatre Parkway
   Mountain View, CA
   USA

   Email: aldrin.ietf@gmail.com

   Jeffrey (Zhaohui) Zhang
   Juniper Networks, Inc.
   10 Technology Park Drive
   Westford, MA  01886
   USA

   Email: zzhang@juniper.net

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