LevelOne GTL-2691 User Manual
Page 1412
C
HAPTER
48
| IP Interface Commands
IPv6 Interface
– 1412 –
◆
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., company id) 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.
◆
When configuring an global IPv6 address for a static tunnel, the link-
local address generated by this command is the 32-bit IPv4 address of
the underlying source interface, with the bytes in the same order in
which they would appear in the header of an IPv4 packet, padded at
the left with zeros to a total of 64 bits. Note that the “Universal/Local”
bit is zero, indicating that the interface identifier is not globally unique.
When the host has more than one IPv4 address in use on the physical
interface concerned, the primary address for that interface is used. The
IPv6 link-local address for an IPv4 virtual interface is formed by
appending the interface identifier, as defined above, to the prefix
FE80::/64.
E
XAMPLE
This example uses the network prefix of 2001:0DB8:0:1::/64, and
specifies that the EUI-64 interface identifier be used in the lower 64 bits of
the address.
Console(config)#interface vlan 1
Console(config-if)#ipv6 address 2001:0DB8:0:1::/64 eui-64
Console(config-if)#end
Console#show ipv6 interface
VLAN 1 is up
IPv6 is enabled.
Link-local address:
FE80::2E0:CFF:FE00:FD/64
Global unicast address(es):
2001:DB8::1:2E0:CFF:FE00:FD/64, subnet is 2001:DB8::1:0:0:0:0/64[EUI]
2001:DB8:2222:7272::72/96, subnet is 2001:DB8:2222:7272::/96[EUI]
Joined group address(es):
FF02::1:FF00:72
FF02::1:FF00:FD
FF02::1
IPv6 link MTU is 1500 bytes
ND DAD is enabled, number of DAD attempts: 3.
ND retransmit interval is 1000 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
Console#
R
ELATED
C
OMMANDS