Command Line Reference Guide

Neighbor Discovery Protocol (NDP)

FTOS supports Neighbor Discovery Protocol for IPv6 on the S5000 switch.

NDP for IPv6 is defined in RFC 2461 as part of the Stateless Address Autoconfiguration protocol. It replaces the Address

Resolution Protocol used with IPv4. NDP defines mechanisms for solving the following problems:

• Router discovery: Hosts can locate routers residing on a link

• Prefix discovery: Hosts can discover address prefixes for the link

• Parameter discovery

• Address autoconfiguration — configuration of addresses for an interface

• Address resolution — mapping from IP address to link-layer address

• Next-hop determination

• Neighbor unreachability detection (NUD): Determine that a neighbor is no longer reachable on the link.

• Duplicate address detection (DAD): Allow a node to check whether a proposed address is already in use.

• Redirect: The router can inform a node about a better first-hop.

NDP makes use of the following five ICMPv6 packet types in its implementation:

• Router Solicitation

• Router Advertisement

• Neighbor Solicitation

• Neighbor Advertisement

• Redirect

clear ipv6 neighbors

Delete all entries in the IPv6 neighbor discovery cache or neighbors of a specific interface. Static entries are not

removed using this command.

S5000

Syntax

clear ipv6 neighbors [ipv6-address] [type slot/port]

Parameters

ipv6-address

Enter the IPv6 address of the neighbor in the x:x:x:x::x format to

remove a specific IPv6 neighbor.

NOTE: The :: notation specifies successive hexadecimal fields of

zero. Only one occurrence of this notation is permitted in an IPv6

address.

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