Asante IC40240-10G, User Manual

Page: 88 / 792

specification is designed for devices that use an extended 8-byte MAC
address. For devices that still use a 6-byte MAC address (also known as
EUI-48 format), it must be converted into EUI-64 format by inverting the
universal/local bit in the address and inserting the hexadecimal number
FFFE between the upper and lower three bytes of the MAC address.
For example, if a device had an EUI-48 address of 28-9F-18-1C-82-35, the
global/local bit must first be inverted to meet EUI-64 requirements (i.e., 1 for
globally defined addresses and 0 for locally defined addresses), changing
28 to 2A. Then the two bytes FFFE are inserted between the OUI (i.e.,
organizationally unique identifier, or company identifier) and the rest of the
address, resulting in a modified EUI-64 interface identifier of
2A-9F-18-FF-FE-1C-82-35.
- This host addressing method allows the same interface identifier to be used
on multiple IP interfaces of a single device, as long as those interfaces are
attached to different subnets.
• Others – System will automatically detect the address type according to the
address/prefix entered in the IPv6 Address field.
Current Address Table
• IPv6 Address – IPv6 address assigned to this interface.
In addition to the unicast addresses assigned to an interface, a node is required to
join the all-nodes multicast addresses FF01::1 and FF02::1 for all IPv6 nodes
within scope 1 (interface-local) and scope 2 (link-local), respectively.
FF01::1/16 is the transient node-local multicast address for all attached IPv6
nodes, and FF02::1/16 is the link-local multicast address for all attached IPv6
nodes. The node-local multicast address is only used for loopback transmission of
multicast traffic. Link-local multicast addresses cover the same types as used by
link-local unicast addresses, including all nodes (FF02::1), all routers (FF02::2),
and solicited nodes (FF02::1:FFXX:XXXX) as described below.
A node is also required to compute and join the associated solicited-node multicast
addresses for every unicast and anycast address it is assigned. IPv6 addresses
that differ only in the high-order bits, e.g. due to multiple high-order prefixes
associated with different aggregations, will map to the same solicited-node
address, thereby reducing the number of multicast addresses a node must join. In
this example, FF02::1:FF90:0/104 is the solicited-node multicast address which is
formed by taking the low-order 24 bits of the address and appending those bits to
the prefix.
Note that the solicited-node multicast address (link-local scope FF02) is used to
resolve the MAC addresses for neighbor nodes since IPv6 does not support the
broadcast method used by the Address Resolution Protocol in IPv4.
• Address Type – Global, Link-local or Multicast.
• Configuration Mode – Shows if address is set manually or auto configured.
4-13
Setting the Switch’s IP Address (IP Version 6)
4