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.
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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 |
GENART Telechat review
(of
-06)
by Meral Shirazipour
Ready w/nits
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Additional resources | Mailing list discussion | ||
Stream | WG state | Submitted to IESG for Publication | |
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. |
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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. Ginsberg, et al. Expires September 12, 2018 [Page 8] Internet-Draft draft-ietf-bier-isis-extensions March 2018 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>. Ginsberg, et al. Expires September 12, 2018 [Page 9] Internet-Draft draft-ietf-bier-isis-extensions March 2018 [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>. Ginsberg, et al. Expires September 12, 2018 [Page 10] Internet-Draft draft-ietf-bier-isis-extensions March 2018 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 Ginsberg, et al. Expires September 12, 2018 [Page 11]