OLT2406 User’s Guide
424
CHAPTER 55
IPv6
55.1 IPv6 Overview
This chapter introduces the IPv6 commands of the OLT.
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 OLT supports the following features.
• Static address assignment (see Section 55.1.1 on page 424) and stateless autoconfiguration (see
Stateless Autoconfiguration on page 427)
• Neighbor Discovery Protocol (see Neighbor Discovery Protocol (NDP) on page 428)
• Remote Management using SNMP, Telnet, and FTP services (see Chapter 85 on page 610)
• ICMPv6 (see ICMPv6 on page 428)
• IPv4/IPv6 dual stack; the OLT can run IPv4 and IPv6 at the same time.
• DHCPv6 client and relay (see DHCPv6 on page 427)
• Multicast Listener Discovery (MLD) snooping and proxy (see Multicast Listener Discovery on page 429)
For more information on IPv6 addresses, refer to RFC 2460 and RFC 4291.
55.1.1 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.
55.1.2 IPv6 Terms
IPv6 Prefix and Prefix Length
Similar to an IPv4 subnet mask, IPv6 uses an address prefix to represent the network address. An IPv6
prefix length specifies how many most significant bits (start from the left) in the address compose the
network address. The prefix length is written as “/x” where x is a number. For example,
2001:db8:1a2b:15::1a2f:0/32
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