Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 526

All the addresses in the following list are all valid and equivalent. • 2001:0db8:0000:0000:0000:0000:1428:57ab • 2001:0db8:0000:0000:0000::1428:57ab • 2001:0db8:0:0:0:0:1428:57ab • 2001:0db8:0:0::1428:57ab • 2001:0db8::1428:57ab • 2001:db8::1428:57ab IPv6 networks are written using classless inter-domain routing (CIDR) notation. An IPv6 network (or subnet) is a contiguous group of IPv6 addresses the size of which must be a power of two; the initial bits of addresses, which are identical for all hosts in the network, are called the network's prefix. A network is denoted by the first address in the network and the size in bits of the prefix (in decimal), separated with a slash. Because a single host is seen as a network with a 128-bit prefix, host addresses may be written with a following /128. For example, 2001:0db8:1234::/48 stands for the network with addresses 2001:0db8:1234:0000:0000:0000:0000:0000 through 2001:0db8:1234:ffff:ffff:ffff:ffff:ffff. Link-local Addresses Link-local addresses, starting with fe80:, are assigned only in the local link area. The addresses are generated usually automatically by the operating system's IP layer for each network interface. This provides instant automatic network connectivity for any IPv6 host and means that if several hosts connect to a common hub or switch, they have an instant communication path via their link-local IPv6 address. Link-local addresses cannot be routed to the public Internet. Static and Dynamic Addressing Static IPv6 addresses are manually assigned to a computer by an administrator. Dynamic IPv6 addresses are assigned either randomly or by a server using dynamic host configuration protocol (DHCP). Even though IPv6 addresses assigned using DHCP may stay the same for long periods of time, they can change. In some cases, a network administrator may implement dynamically assigned static IPv6 addresses. In this case, a DHCP server is used, but it is specifically configured to always assign the same IPv6 address to a particular computer, and never to assign that IP address to another computer. This allows static IPv6 addresses to be configured in one place, without having to specifically configure each computer on the network in a different way. In IPv6, every interface, whether using static or dynamic address assignments, also receives a local-link address automatically in the fe80::/64 subnet. IPv6 Implementation on the Dell Networking OS The Dell Networking OS supports both IPv4 and IPv6 and both versions may be used simultaneously in your system. The following table lists the Dell Networking OS version in which an IPv6 feature became available for each platform. The sections following the table give greater detail about the feature. 526 IPv6 Routing