Purpose:
This is the simple IPv6 address configuration using GNS3 and three routers. Where most of the interfaces were assigned by using simple IPv6 address command while two interfaces in the middle router(R2) used Extended Unique Identifier (EUI) based addressing so the last 64bits were automatically assigned by the router itself after associating the MAC address of that particular interface and a step further. We used GNS3 software to demonstrate the example. Detailed configuration is also given on the image so please click on the picture for enlarged image if needed. Thank you for visiting the website.
Tips:
EUI or Extended Unique Identifier follows three simple steps to assign the interface id (the last 64 bits of the IPv6 address) which defines the 2nd part or last 64 bits of the EUI based IPv6 address of that particular interface.
Step 1. Use F0/0’s MAC Address: xxxx.xxxx.xxxx
Step 2. Split into two halves and insert FFFE: xxxx:xxFF:FExx:xxxx
Step 3. Invert 7th bit: for Hex 00 = 00000000 binary, flip for 00000010, and convert back to
hex , resulting in xyxx:xxFF:FExx:xxxx
Useful commands
For R2
show running-config
Will show how the interfaces are configured.
show interface f0/0
Will show the Hardware or MAC address of f0/0 interface
show ipv6 int f0/0
Will show three multicast groups joined by the router
FF02::1 (Address for all IPv6 devices must listen)
FF02::2 (Represents all IPv6 routers provided if IPv6 unicast is enabled. must listen)
FF02::1:FFxx:xxxx (Multipurpose Multicast address helpful for functions such as Duplicate Address Detection and Neighbor discovery; DAD and ND, must be there)
show ipv6 route
will show a new (L) LOCAL Route with 128 bit subnet mask
The Local routes, all /128 routes, are essentially host routes for the router’s unicast
IPv6 addresses. These local routes allow the router to more efficiently process packets
directed to the router itself, rather than for packets directed toward connected subnets.
debug ipv6 nd
ping 2000:0:02::3
will show NS and ND messages (Neighbor Solicitation and Neighbor Discovery Messages)
Routing Layers 