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35-2
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
Chapter 35 Configuring IPv6 Host Functions
Understanding IPv6
This section describes IPv6 implementation on the switch.
• IPv6 Addresses, page 35-2
• Supported IPv6 Host Features, page 35-2
IPv6 Addresses
The switch supports only IPv6 unicast addresses. It does not support site-local unicast addresses, anycast
addresses, or multicast addresses.
The IPv6 128-bit addresses are represented as a series of eight 16-bit hexadecimal fields separated by
colons in the format: n:n:n:n:n:n:n:n. This is an example of an IPv6 address:
2031:0000:130F:0000:0000:09C0:080F:130B
For easier implementation, leading zeros in each field are optional. This is the same address without
leading zeros:
2031:0:130F:0:0:9C0:80F:130B
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
Catalyst 2960 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 35-3
• DNS for IPv6, page 35-3
• ICMPv6, page 35-3
• Neighbor Discovery, page 35-3
• IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 35-4
• IPv6 Applications, page 35-4
• Dual IPv4 and IPv6 Protocol Stacks, page 35-4
• SNMP and Syslog Over IPv6, page 35-5
• HTTP(S) Over IPv6, page 35-5
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.