IPv6 Overview Configuring IPv6
page 17-10 OmniSwitch AOS Release 7 Network Configuration Guide June 2013
Globally Unique Local IPv6 Unicast Addresses
These addresses are intended to be routable within a limited area such as a site but not on the global Inter-
net. Unique Local IPv6 Unicast Addresses are used in conjunction with BGP (IBGP) speakers as well as
exterior BGP (EBGP) neighbors based on configured policies. See the BGP chapter of the Advanced
Routing Guide for details.
Local IPv6 unicast addresses have the following characteristics:
• Globally unique ID (with high probability of uniqueness).
• Use the well-known prefix FC00::/7 to to allow for easy filtering at site boundaries.
• Allow sites to be combined or privately interconnected without creating any address conflicts or requir-
ing renumbering of interfaces that use these prefixes.
• Internet Service Provider independent and can be used for communications inside of a site without
having any permanent or intermittent Internet connectivity.
• If accidentally leaked outside of a site via routing or DNS, there is no conflict with any other addresses.
• In practice, applications may treat these addresses like global scoped addresses.
A 40-bit global identifier is used to make the local IPv6 address prefixes globally unique. This global ID
can either be explicitly configured, or created using the pseudo-algorithm recommended in RFC 4193.
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