--- 1/draft-ietf-lsr-ip-flexalgo-02.txt 2021-05-14 11:13:10.034495361 -0700 +++ 2/draft-ietf-lsr-ip-flexalgo-03.txt 2021-05-14 11:13:10.070496259 -0700 @@ -1,23 +1,23 @@ LSR Working Group W. Britto Internet-Draft S. Hegde Intended status: Standards Track P. Kaneriya -Expires: October 30, 2021 R. Shetty +Expires: November 15, 2021 R. Shetty R. Bonica Juniper Networks P. Psenak Cisco Systems - April 28, 2021 + May 14, 2021 IGP Flexible Algorithms (Flex-Algorithm) In IP Networks - draft-ietf-lsr-ip-flexalgo-02 + draft-ietf-lsr-ip-flexalgo-03 Abstract An IGP Flexible Algorithm (Flex-Algorithm) allows IGP to compute constraint-based paths. As currently defined, IGP Flex-Algorithm is used with Segment Routing (SR) data planes - SR MPLS and SRv6. Therefore, Flex-Algorithm cannot be deployed in the absence of SR. This document extends IGP Flex-Algorithm, so that it can be used for regular IPv4 and IPv6 prefixes. This allows Flex-Algorithm to be @@ -31,21 +31,21 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." - This Internet-Draft will expire on October 30, 2021. + This Internet-Draft will expire on November 15, 2021. Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents @@ -314,30 +314,28 @@ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ISIS IPv4 Algorithm Prefix Reachability TLV o Metric (4 octets): Metric information. o Flags (1 octet): 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ - |D|S| | | + |D| Reserved | +-+-+-+-+-+-+-+-+ D-flag: When the Prefix is leaked from level-2 to level-1, the D bit MUST be set. Otherwise, this bit MUST be clear. Prefixes with the D bit set MUST NOT be leaked from level-1 to level-2. This is to prevent looping. - S-flag: Set when Sub-TLVs are present for the prefix entry. - o Algorithm (1 octet): Associated Algorithm from 1 to 255. o Prefix Len (1 octet): Prefix length measured in bits. o Prefix (variable length): Prefix mapped to Flex-Algorithm. o Optional Sub-TLV-length (1 octet): Number of octets used by sub- TLVs o Optional sub-TLVs (variable length). @@ -415,22 +413,22 @@ OSPFv2 Algorithm Prefix Reachability TLV Type: Algorithm Prefix Reachability TLV (Value TBD by IANA). Length: Variable dependent on sub-TLVs. Route Type (1 octet): type of the OSPF route. Supported types are: 1 - Intra-Area - 2 - Inter-Area + 2 - Inter-Area 3 - AS External with Type-1 Metric 4 - AS External with Type-2 Metric 5 - NSSA External with Type-1 Metric 6 - NSSA External with Type-2 Metric Prefix Length (1 octet): Length of prefix in bits. @@ -633,34 +631,35 @@ +-------+----------------------------------+------------------------+ | Value | TLV Name | Reference | +-------+----------------------------------+------------------------+ | TBD | OSPFv2 Algorithm Prefix | This Document, | | | Reachability TLV | Section 6.1 | +-------+----------------------------------+------------------------+ 12. Security Considerations - TBD + This document inherits security considerations from + [I-D.ietf-lsr-flex-algo]. 13. Acknowledgements - TBD. + Thanks to Bruno Decraene for his contributions to this document. 14. References 14.1. Normative References [I-D.ietf-lsr-flex-algo] Psenak, P., Hegde, S., Filsfils, C., Talaulikar, K., and A. Gulko, "IGP Flexible Algorithm", draft-ietf-lsr-flex- - algo-14 (work in progress), February 2021. + algo-15 (work in progress), April 2021. [ISO10589] IANA, "Intermediate system to Intermediate system routing information exchange protocol for use in conjunction with the Protocol for providing the Connectionless-mode Network Service (ISO 8473)", August 1987, . [RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791, DOI 10.17487/RFC0791, September 1981, . @@ -718,24 +717,24 @@ May 2017, . [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", STD 86, RFC 8200, DOI 10.17487/RFC8200, July 2017, . 14.2. Informative References [I-D.ietf-spring-srv6-network-programming] - Filsfils, C., Camarillo, P., Leddy, J., Voyer, D., - Matsushima, S., and Z. Li, "SRv6 Network Programming", - draft-ietf-spring-srv6-network-programming-28 (work in - progress), December 2020. + Filsfils, C., Garvia, P. C., Leddy, J., Voyer, D., + Matsushima, S., and Z. Li, "Segment Routing over IPv6 + (SRv6) Network Programming", draft-ietf-spring-srv6- + network-programming-28 (work in progress), December 2020. [IANA-ALG] IANA, "Sub-TLVs for TLV 242 (IS-IS Router CAPABILITY TLV)", August 1987, . [RFC5286] Atlas, A., Ed. and A. Zinin, Ed., "Basic Specification for IP Fast Reroute: Loop-Free Alternates", RFC 5286, DOI 10.17487/RFC5286, September 2008, .