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Understanding IPv6
The architecture of IPv6 allows existing IPv4 users to transition easily to IPv6, and provides services
such as end-to-end security, quality of service (QoS), and globally unique addresses. The flexibility of
the IPv6 address space reduces the need for private addresses and the use of Network Address
Translation (NAT) processing by border routers at the edge of networks. IPv6 provides newer unicast
methods, introduces hexadecimal values into the IP address, and uses colons (:) instead of periods (.) as
delimiters.
IPv6 also provides these advantages over IPv4:
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For information about how Cisco Systems implements IPv6, go to this URL:
This section describes IPv6 implementation on the switch. These sections are included:
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IPv6 Addresses
IPv6 supports three types of addresses: unicast (one-to-one), multicast (one-to-many), and anycast
(one-to-nearest). Multicast addresses replace the use of broadcast addresses. The switch supports only
IPv6 unicast addresses. The switch does not support site-local unicast addresses, anycast addresses, or
multicast addresses in this release.
The IPv6 128-bit addresses are represented as a series of eight 16-bit hexadecimal fields separated by
colons in the format: x:x:x:x:x:x:x:x. This is an example of an IPv6 address:
For easier implementation, leading zeros in each field are optional. This is the same address without
leading zeros:
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:
For more information about IPv6 address formats, address types, and the IPv6 packet header, go to the
"Implementing Addressing and Basic Connectivity" section of "The Cisco IOS IPv6 Configuration
Library" at this URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00807fcf4b.
html
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
35-2
Easier address management and delegation
Easy address autoconfiguration with stateless autoconfiguration, which is similar to DHCP but does
not require a specified DHCP application or server
Embedded IPsec (encrypted security)
Routing optimized for mobile devices
Duplicate Address Detection (DAD) feature
http://www.cisco.com//warp/public/732/Tech/ipv6/
IPv6 Addresses, page 35-2
Supported IPv6 Unicast Host Features, page 35-3
Dual IPv4 and IPv6 SDM Templates, page 35-12
2031:0000:130F:0000:0000:09C0:080F:130B
2031:0:130F:0:0:9C0:80F:130B
2031:0:130F::09C0:080F:130B
Chapter 35
Configuring IPv6 Host Functions
OL-8915-03
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