Administrator Guide

Table Of Contents
Feature and Functionality Dell Networking OS
Release Introduction
Documentation and Chapter
Location
Z9000
MLDv1/v2 N/A
IPv6 PIM in the Dell
Networking OS Command Line
Reference Guide.
ICMPv6
ICMP for IPv6 combines the roles of ICMP, IGMP and ARP in IPv4. Like IPv4, it provides functions for reporting delivery and
forwarding errors, and provides a simple echo service for troubleshooting. The Dell Networking OS implementation of ICMPv6 is
based on RFC 4443.
Generally, ICMPv6 uses two message types:
Error reporting messages indicate when the forwarding or delivery of the packet failed at the destination or intermediate
node. These messages include Destination Unreachable, Packet Too Big, Time Exceeded and Parameter Problem messages.
Informational messages provide diagnostic functions and additional host functions, such as Neighbor Discovery and Multicast
Listener Discovery. These messages also include Echo Request and Echo Reply messages.
The Dell Networking OS ping and traceroute commands extend to support IPv6 addresses. These commands use ICMPv6
Type-2 messages.
Path MTU Discovery
Path MTU, in accordance with RFC 1981, defines the largest packet size that can traverse a transmission path without suffering
fragmentation. Path MTU for IPv6 uses ICMPv6 Type-2 messages to discover the largest MTU along the path from source to
destination and avoid the need to fragment the packet.
The recommended MTU for IPv6 is 1280. Greater MTU settings increase processing efficiency because each packet carries
more data while protocol overheads (for example, headers) or underlying per-packet delays remain fixed.
Figure 42. Path MTU Discovery Process
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IPv6 Routing