Cisco WS-2960-24LC-S Software Guide - Page 573
Supported IPv6 Unicast Routing Features, 128-Bit Wide Unicast Addresses
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Chapter 29 Configuring IPv6 Host Functions Understanding IPv6 In the "Implementing Addressing and Basic Connectivity" chapter, these sections apply to the Catalyst 2960 switch: • IPv6 Address Formats • IPv6 Address Output Display • Simplified IPv6 Packet Header Supported IPv6 Unicast Routing Features These sections describe the IPv6 protocol (RFC 2460) features supported by the switch: • 128-Bit Wide Unicast Addresses, page 29-3 • ICMPv6, page 29-4 • Neighbor Discovery, page 29-4 • IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 29-4 • IPv6 Applications, page 29-5 • Dual IPv4 and IPv6 Protocol Stacks, page 29-5 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. • 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. 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-8603-04 Catalyst 2960 Switch Software Configuration Guide 29-3
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