Flexible Algorithm Definition Advertisement with BGP Link-State
draft-ietf-idr-bgp-ls-flex-algo-04
Inter-Domain Routing K. Talaulikar, Ed.
Internet-Draft P. Psenak
Intended status: Standards Track Cisco Systems
Expires: January 6, 2021 S. Zandi
G. Dawra
LinkedIn
July 5, 2020
Flexible Algorithm Definition Advertisement with BGP Link-State
draft-ietf-idr-bgp-ls-flex-algo-04
Abstract
Flexible Algorithm is a solution that allows routing protocols (viz.
OSPF and IS-IS) to compute paths over a network based on user-defined
(and hence, flexible) constraints and metrics. The computation is
performed by routers participating in the specific network in a
distribute manner using a Flex Algorithm definition. This definition
provisioned on one or more routers and propagated (viz. OSPF and IS-
IS flooding) through the network.
BGP Link-State (BGP-LS) enables the collection of various topology
information from the network. This draft defines extensions to BGP-
LS address-family to advertise the Flexible Algorithm Definition as a
part of the topology information from the network.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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 January 6, 2021.
Talaulikar, et al. Expires January 6, 2021 [Page 1]
Internet-Draft BGP-LS Extensions for Flex Algo July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. BGP-LS Extensions for Flex Algo . . . . . . . . . . . . . . . 4
3. Flexible Algorithm Definition . . . . . . . . . . . . . . . . 5
3.1. Flex Algo Exclude Any Affinity . . . . . . . . . . . . . 6
3.2. Flex Algo Include Any Affinity . . . . . . . . . . . . . 7
3.3. Flex Algo Include All Affinity . . . . . . . . . . . . . 8
3.4. Flex Algo Definition Flags . . . . . . . . . . . . . . . 8
3.5. Flex Algo Exclude SRLG . . . . . . . . . . . . . . . . . 9
4. Flex Algorithm Prefix Metric . . . . . . . . . . . . . . . . 10
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6. Manageability Considerations . . . . . . . . . . . . . . . . 11
6.1. Operational Considerations . . . . . . . . . . . . . . . 12
6.2. Management Considerations . . . . . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
IGP protocols (OSPF and IS-IS) traditionally compute best paths over
the network based on the IGP metric assigned to the links. Many
network deployments use RSVP-TE [RFC3209] based or Segment Routing
(SR) Policy [I-D.ietf-spring-segment-routing-policy] based solutions
to enforce traffic over a path that is computed using different
metrics or constraints than the shortest IGP path.
[I-D.ietf-lsr-flex-algo] defines the Flexible Algorithm solution that
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