Administrator Guide

Feature and
Functionality
Dell Networking OS
Release Introduction
Documentation and
Chapter Location
Z9000
(outbound SSH) Layer 3
only
Secure Shell (SSH) server
support over IPv6
(inbound SSH) Layer 3
only
8.3.11 Secure Shell (SSH) Over
an IPv6 Transport
IPv6 Access Control
Lists
8.3.11 IPv6 Access Control Lists
in the Dell Networking
OS Command Line
Reference Guide.
IPv6 Multicast
MLDv1/v2 N/A
IPv6 PIM in the Dell
Networking OS
Command Line
Reference Guide.
ICMPv6
ICMPv6 is supported on the Z9000 platform.
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
IPv6 path maximum transmission unit (MTU) discovery is supported on the Z9000 platform.
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.
IPv6 Routing
387