Bit Wide Unicast Addresses - Cisco IE-4000 Software Configuration Manual

Configuring IPv6 Host Functions
Information About Configuring IPv6 Host Functions
You can also use two colons (::) to represent successive hexadecimal fields of zeros, but you can use this short version
only once in each address:
2031:0:130F::09C0:080F:130B
For more information about IPv6 address formats, address types, and the IPv6 packet header, see the "Implementing
IPv6 Addressing and Basic Connectivity" chapter of Cisco IOS IPv6 Configuration Library on Cisco.com.
In the "Implementing Addressing and Basic Connectivity" chapter, these sections apply to the switch:

IPv6 Address Formats

IPv6 Address Output Display

Simplified IPv6 Packet Header
Supported IPv6 Host Features
These sections describe the IPv6 protocol features supported by the switch:

128-Bit Wide Unicast Addresses, page 658

DNS for IPv6, page 659

ICMPv6, page 659

Neighbor Discovery, page 659

Default Router Preference, page 659

IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 659

IPv6 Applications, page 660

Dual IPv4 and IPv6 Protocol Stacks, page 660

SNMP and Syslog Over IPv6, page 661

HTTP over IPv6, page 661
Support on the switch includes expanded address capability, header format simplification, improved support of
extensions and options, and hardware parsing of the extension header. The switch supports hop-by-hop extension
header packets, which are routed or bridged in software.

128-Bit Wide Unicast Addresses

The switch supports aggregatable global unicast addresses and link-local unicast addresses. It does not support
site-local unicast addresses.

Aggregatable global unicast addresses are IPv6 addresses from the aggregatable global unicast prefix. The address
structure enables strict aggregation of routing prefixes and limits the number of routing table entries in the global
routing table. These addresses are used on links that are aggregated through organizations and eventually to the
Internet service provider.
These addresses are defined by a global routing prefix, a subnet ID, and an interface ID. Current global unicast
address allocation uses the range of addresses that start with binary value 001 (2000::/3). Addresses with a prefix
of 2000::/3(001) through E000::/3(111) must have 64-bit interface identifiers in the extended unique identifier
(EUI)-64 format.
658