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CHAPTER 3
Configuring Neighbor Discovery
Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure Neighbor Discovery (ND) on your E Series router;
it contains the following sections:
Overview on page 189
Platform Considerations on page 190
References on page 190
Before You Configure Neighbor Discovery on page 190
Configuring Neighbor Discovery on page 191
Configuring Proxy Neighbor Advertisements on page 196
Configuring Duplicate Address Detection Attempts on page 197
Monitoring Neighbor Discovery on page 197
Though not a true protocol, routers and hosts (nodes) use Neighbor Discovery (ND)
messages to determine the link-layer addresses of neighbors that reside on attached
links and to overwrite invalid cache entries. Hosts also use ND to find neighboring routers
that can forward packets on their behalf.
In addition, nodes use ND to actively track the ability to reach neighbors. When a router
(or the path to a router) fails, nodes actively search for alternatives to reach the
destination.
IPv6 Neighbor Discovery corresponds to a number of the IPv4 protocols — ARP, ICMP
Router Discovery, and ICMP Redirect. However, Neighbor Discovery provides many
improvements over the IPv4 set of protocols. These improvements address the following:
Router discovery—How a host locates routers residing on an attached link.
Prefix discovery—How a host discovers address prefixes for destinations residing on
an attached link. Nodes use prefixes to distinguish between destinations that reside
on an attached link and those destinations that it can reach only through a router.
Parameter discovery—How a node learns various parameters (link parameters or
Internet parameters) that it places in outgoing packets.
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