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Chapter 35
Configuring IPv6 Host Functions
In the "Implementing Addressing and Basic Connectivity" chapter, these sections apply to the switch:
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Supported IPv6 Unicast Host Features
These sections describe the IPv6 protocol (RFC 2460) features supported by the switch:
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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 (RFC 2373).
It does not support site-local unicast addresses.
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See the section on IPv6 Unicast Addresses in the "Implementing Addressing and Basic Connectivity for
IPv6" chapter in the Cisco IOS IPv6 Configuration Library at this URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00807fcf4b.
html
Each IPv6 host interface can support up to three addresses in hardware (one aggregatable global unicast
address, one link-local unicast address, and zero or more privacy addresses).
OL-8915-03
IPv6 Address Formats
IPv6 Address Output Display
Simplified IPv6 Packet Header
128-Bit Wide Unicast Addresses, page 35-3
ICMPv6, page 35-4
Neighbor Discovery, page 35-4
IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 35-4
IPv6 Applications, page 35-9
Dual IPv4 and IPv6 Protocol Stacks, page 35-10
SNMP and Syslog Over IPv6, page 35-10
HTTP(S) Over IPv6, page 35-12
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 universal 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 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 Catalyst Blade Switch 3020 for HP Software Configuration Guide
Understanding IPv6
35-3
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