3.1.b Identify implement and troubleshoot IPv6 addressing and subnetting

dsw1#sh int f0/1 | i bia
Hardware is Fast Ethernet, address is 0016.479e.4542 (bia 0016.479e.4542)

dsw1#sh ipv6 int f0/1
FastEthernet0/1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::216:47FF:FE9E:4542

7th bit inverted

  0         0     1        6

0000 0000  0001 0110

0000 0010 0001 0110

0             1       6

FE80:: link local

note: besides 7th bit inversion and FFFE (EUI insertion) the address matches the BIA exactly…

here is more from keith barker:

! MAC address, for reference, that is currently used on the Fa0/1
! interface
R1# show interfaces fa0/1 | include bia
Hardware is i82543 , address is ca00.4132.0006 (bia ca00.4132.0006)
R1# show ipv6 interface fa0/1
FastEthernet0/1 is up, line protocol is up
! Link local address, beginning with FE80::
! and using modified EUI-64 for the host ID
! Notice that CA from the MAC address is C8 in the host ID
! due to inverting the 7th bit for the modified EUI-64 formatting
IPv6 is enabled, link-local address is FE80::C800:41FF:FE32:6
! Global addresses have the first group range of 2000-3fff
Global unicast address(es):
2001:DB8::1234:0:52:1, subnet is 2001:DB8::/64
! Multicast begins with FFxx:
Joined group address(es):
! Because we are enabled for IPv6 on this interface
FF02::1
! Because we are enabled for IPv6 routing
FF02::2
! Because we are enabled for RIPng
FF02::9
! Because our link local address ends in 32:0006
! This is a solicited node multicast group
FF02::1:FF32:6
! Because our global address ends in 52:0001
! This is a solicited node multicast group
FF02::1:FF52:1

there’s some creamy ipv6 goodness…