Link Local Next Hop Handling for BGP
draft-white-linklocalnh-00

Document Type Expired Internet-Draft (individual)
Last updated 2020-04-02 (latest revision 2019-09-30)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-white-linklocalnh-00.txt

Abstract

BGP, described in [RFC4271], was originally designed to provide reachability between domains and between the edges of a domain. As such, BGP assumes the next hop towards any reachable destination may not reside on the advertising speaker, but rather may either be through a router connected to the same subnet as the speaker, or through a router only reachable by traversing multiple hops through the network. Because of this, BGP does not recognize the use of IPv6 link local addresses, as described in [RFC4291], as a valid next hop for forwarding purposes. However, BGP speakers are now often deployed on point-to-point links in networks where multihop reachability of any kind is not assumed or desired (all next hops are assumed to be the speaker reachable through a directly connected point-to-point link). This is common, for instance, in data center fabrics. In these situations, a global IPv6 address is not required for the advertisement of reachability information; in fact, providing global IPv6 addresses in these kinds of networks can be detrimental to Zero Touch Provisioning (ZTP). This draft standardizes the operation of BGP over a point-to-point link using link local IPv6 addressing only.

Authors

Russ White (russ@riw.us)
Donald Sharp (sharpd@cumulusnetworks.com)
Dinesh Dutt (ddutt@hobbesdutt.com)
Biswajit Sadhu (biswajit.sadhu@gmail.com)
Jeff Tantsura (jefftant.ietf@gmail.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)