Address Formats; Ipv6 Extension Headers - Avaya 4524GT Configuration Manual

System configuration fundamentals
If you manually configure interface IDs or MAC addresses (or both), no relationship between
the MAC address and the interface ID is necessary. A manually configured interface ID can
be longer or shorter than 64 bits.

Address formats

The format for representing an IPv6 address is n:n:n:n:n:n:n:n n is the hexadecimal
representation of 16 bits in the address.
An example is as follows: FF01:0:0:0:0:0:0:43
Each nonzero field must contain at least one numeral. Within a hexadecimal field, however,
leading zeros are not required.
Certain classes of IPv6 addresses commonly include multiple contiguous fields containing
hexadecimal 0. The following sample address includes five contiguous fields containing zeroes
with a double colon (::): FF01::43
You can use a double colon to compress the leading zero fields in a hexadecimal address. A
double colon can appear once in an address.
An IPv4-compatible address combines hexadecimal and decimal values as follows:
x:x:x:x:x:x:d.d.d.d x:x:x:x:x:x is a hexadecimal representation of the six high-order 16-bit pieces
of the address, and d.d.d.d is a decimal representation of the four 8-bit pieces of the
address.
For example: 0:0:0:0:0:0:13.1.68.3
or
::13.1.68.3

IPv6 extension headers

IPv6 extension headers describe processing options. Each extension header contains a
separate category of options. A packet can include zero or more extension headers. For more
information, see
Figure 7: IPv6 header and extension headers
IPv6 examines the destination address in the main header of each packet it receives; this
examination determines whether the router is the packet destination or an intermediate node
in the packet data path. If the router is the destination of the packet, IPv6 examines the header
32 Configuration — System
Figure 7: IPv6 header and extension headers on page 32.
April 2011