Gratuitous Neighbor Discovery: Creating Neighbor Cache Entries on First-Hop Routers
RFC 9131, “Gratuitous Neighbor Discovery: Creating Neighbor Cache Entries on First-Hop Routers”, is a Proposed Standard document published in October 2021 by J. Linkova. It updates RFC 4861. The canonical text is published by the RFC Editor.
Abstract
Neighbor Discovery (RFC 4861) is used by IPv6 nodes to determine the link-layer addresses of neighboring nodes as well as to discover and maintain reachability information. This document updates RFC 4861 to allow routers to proactively create a Neighbor Cache entry when a new IPv6 address is assigned to a node. It also updates RFC 4861 and recommends that nodes send unsolicited Neighbor Advertisements upon assigning a new IPv6 address. These changes will minimize the delay and packet loss when a node initiates connections to an off-link destination from a new IPv6 address.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9131 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9132 Distributed Denial-of-Service Open Threat Signaling Signal Channel Specification
- RFC 9133 Controlling Filtering Rules Using Distributed Denial-of-Service Open Threat Signaling Signal Channel
- RFC 9134 RTP Payload Format for ISO/IEC 21122
- RFC 9127 YANG Data Model for Bidirectional Forwarding Detection
- RFC 9135 Integrated Routing and Bridging in Ethernet VPN
- RFC 9126 OAuth 2.0 Pushed Authorization Requests
- RFC 9136 IP Prefix Advertisement in Ethernet VPN
- RFC 9125 Gateway Auto-Discovery and Route Advertisement for Site Interconnection Using Segment Routing