Ethernet Switch CLI Reference Guide
139
CHAPTER 33
IPv6 Commands
33.1 IPv6 Overview
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The
increase in IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 10
38
IP addresses. At the time of writing, the Switch supports the following features.
• Static address assignment (see Section 33.1.1 on page 139) and stateless autoconfiguration
(see Stateless Autoconfiguration on page 142)
• Neighbor Discovery Protocol (see Neighbor Discovery Protocol (NDP) on page 144)
• Remote Management using SNMP, Telnet, HTTP and FTP services (see Chapter 61 on
page 245)
• ICMPv6 (see ICMPv6 on page 143)
• IPv4/IPv6 dual stack; the Switch can run IPv4 and IPv6 at the same time.
• DHCPv6 client and relay (see DHCPv6 on page 142)
• Multicast Listener Discovery (MLD) snooping and proxy (see Multicast Listener
Discovery on page 144)
For more information on IPv6 addresses, refer to RFC 2460 and RFC 4291.
33.1.1 IPv6 Addressing
The 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:).
This is an example IPv6 address
2001:0db8:1a2b:0015:0000:0000:1a2f:0000.
IPv6 addresses can be abbreviated in two ways:
• Leading zeros in a block can be omitted. So
2001:0db8:1a2b:0015:0000:0000:1a2f:0000 can be written as
2001:db8:1a2b:15:0:0:1a2f:0.
• Any number of consecutive blocks of zeros can be replaced by a double colon. A double
colon can only appear once in an IPv6 address. So
2001:0db8:0000:0000:1a2f:0000:0000:0015 can be written as
2001:0db8::1a2f:0000:0000:0015 or 2001:0db8:0000:0000:1a2f::0015.
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