Bit Unicast Addresses; Dns For Ipv6 - Cisco ME 3400 Software Configuration Manual

Chapter 36 Configuring IPv6 Unicast Routing
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128-Bit Unicast Addresses

The switch supports aggregatable global unicast addresses and link-local unicast addresses. It does not
support site-local unicast addresses.
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For more information, see the section about IPv6 unicast addresses in the "Implementing IPv6
Addressing and Basic Connectivity" chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.

DNS for IPv6

IPv6 supports Domain Name System (DNS) record types in the DNS name-to-address and
address-to-name lookup processes. The DNS AAAA resource record types support IPv6 addresses and
are equivalent to an A address record in IPv4. The switch supports DNS resolution for IPv4 and IPv6.
OL-9639-07
Neighbor Discovery, page 36-4
Default Router Preference, page 36-4
IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 36-4
IPv6 Applications, page 36-5
Dual IPv4 and IPv6 Protocol Stacks, page 36-5
DHCP for IPv6 Address Assignment, page 36-6
Static Routes for IPv6, page 36-6
RIP for IPv6, page 36-6
OSPF for IPv6, page 36-6
EIGRP IPv6, page 36-6
HTTP(S) Over IPv6, page 36-7
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.
Link local unicast addresses can be automatically configured on any interface by using the link-local
prefix FE80::/10(1111 1110 10) and the interface identifier in the modified EUI format. Link-local
addresses are used in the neighbor discovery protocol (NDP) and the stateless autoconfiguration
process. Nodes on a local link use link-local addresses and do not require globally unique addresses
to communicate. IPv6 routers do not forward packets with link-local source or destination addresses
to other links.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Understanding IPv6
36-3